Sec. 68.500  Specifications.

    General. The US customary units are shown in parentheses throughout 
this

[[Page 323]]

subpart F. US customary units were the original dimensional units used 
in designing the plugs and jacks shown in the following pages. The 
dimensions shown without parenthesis are in SI units. The SI dimensional 
units are derived from the US customary units by multiplying ``inches'' 
by ``25.4'' to derive the exact conversion in millimeters with no 
rounding-off of the resulting decimal value. The number of decimal 
places to which the conversion is taken by adding a particular number of 
zeroes to the right end of the resulting SI value, where required, is 
governed by the concept that when the calculated SI dimensional unit is 
divided by ``25.4,'' the resulting ``inches'' calculation will be 
exactly that shown in the parenthesis (the original design dimension). 
The conversion to SI force units, newtons, is rounded off to a number of 
decimal places that will result in the calculated SI force value being 
within less than one percent of the original US customary force unit 
value located adjacent in parenthesis (the original design value). The 
rationale for this is that this will bring the force conversions to 
within the degree of accuracy of the force-measuring device and avoid 
the carrying of an unrealistic number of decimal places which would 
otherwise result from an exact conversion. The plugs and jacks described 
in this section represent the standard connections to be used for 
connections to the telephone network. The plug and jack designs shown 
are representative of generic types, and should not be interpreted as 
the only designs that may be used. Design innovation and improvement is 
expected; but for interchangeability to be maintained, alternative 
designs (the ``or equivalent'' permitted in Sec. 68.104) must be 
compatible with the plugs and jacks shown. The interface dimensions 
between mating plugs and jacks must be maintained. Hardware used to 
mount, protect, and enclose standard jacks is not described. The only 
requirement on connecting blocks, housings, dust covers, outdoor boxes, 
and the like that contain standard network jacks is that they accept 
standard plugs with cordage. For special purpose applications, plugs may 
be made longer than shown or adapted for direct use on equipment or 
apparatus without cordage. The sliding modular plug used on the back of 
many modular wall telephone sets is an example of such a special purpose 
application. It is the responsibility of the designers and manufacturers 
of communication equipment who use such plugs to assure that they are 
compatible with the hardware used to mount standard jacks with which 
they plan to interface. For the purposes of this section, hard gold and 
contact performance equivalent to gold shall be determined in accordance 
with the standards detailed in Appendix H of TIA Telecommunications 
Systems Bulletin No. 31 Part 68 Rationale and Measurement Guidelines 
(TSB.31), prepared by EIA/TIA TR-41 Committee on Telephone Terminals 
(1992). This publication may be obtained by contacting Global 
Engineering Documents, 7730 Carondelet Avenue, Suite 407, St. Louis, 
Missouri, 63105. (Telephone number 1-800-854-7179).
    (a) Minature 6-position plug:

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[[Page 327]]


Notes: (Notes apply to Figures 68.500(a)(2)(i) and 68.500(a)(2)(ii))

1. All plugs must be capable of meeting the requirements of the plugs go 
and no-go gauges.
2. Section BB applies to any jack contact receiving slot which does not 
contain a plug contact.
3. The preferred major cordage cross section is 2.5400 mm (.100 inch) 
max. thick by 5.0800 mm (.200 inch) max. wide, with rounded corners. It 
should exit the plug on the plug centerline. Other cordage 
configurations are permitted but may inhibit the special features of 
some network jack enclosures.
4. The standard plug length is 11.6840 mm (.460 inch) max. Plugs may be 
made longer than standard or adapted for direct use on special cords, 
adapters with out cordage, and on apparatus or equipment subject to the 
limitations described in the Section 68.500 introductory paragraphs. 
Plugs longer than standard may inhibit the special features of some 
network jack enclosures.
5. A 12.0396 mm (.474 inch) minimum tab length is required. It is 
preferred that a maximum tab length be no longer than 13.2080 mm (.520 
inch). Longer tabs may be used with the same limitations as described in 
Note 4.
6. To obtain maximum plug guidance when 6-position plugs are inserted in 
8-position jacks, it is desirable to extend the front plug nose to the 
2.3368 mm (.092 inch) maximum.
7. These dimensions apply to the location of jack contact receiving 
slots. It is desirable that plug contacts be centered axially in these 
slots, but centering is not required.
8. The 6.0452/6.1722 mm (.238/.243 inch) dimension is preferred to 
obtain maximum plug guidance in jacks with more than 6 conductors. A 
tolerance range of 5.9182/6.1722 mm (.233/.243 inch) is permitted, but 
may create targeting problems in 8-position jacks.
9. The center rib centerline shall be coincident with the plug width 
9.6520 mm (.380 inch) ref. centerline within +/- .0762mm (+/- .003 
inch).

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[GRAPHIC] [TIFF OMITTED] TC02JN91.036



[[Page 329]]

Notes: (Notes apply to Figure 68.500(a)(3)(i))

1. The plug/jack contact interface should be hard gold to hard gold and 
should have a minimum gold thickness of .0012700 mm (0.000050 inch) on 
each side of the interface. The minimum contact force should be .98 N 
(100 grams). Any non-gold contact material must be compatible with gold 
and provide equivalent contact performance. A smooth, burr-free surface 
is required at the interface in the area shown.
2. The jack contact design is based upon .4572 mm (.018 inch) spring 
temper phosphor bronze round wire in the modular plug blade and jack 
contact interface. Other contact configurations that provide contact 
performance equal to or better than the preferred configurations and do 
not cause damage to the plug or jack are permitted. The preferred jack 
contact width is .44958/.49530 mm (.0177/.0195 inches). Deviations from 
the preferred jack contact width are permitted for round contacts as 
well as noncircular cross sectional shapes but they must be compatible 
with existing plug configurations. The requirements of Note 1 apply to 
all possible contact areas.
3. The configuration of the plug contact and the front plastic of the 
plug should prevent jack contacts from being damaged during plug 
insertion into jacks.
4. This is the suggested nominal contact angle between plugs and jacks 
with the plug latched into the jack. If this angle becomes greater than 
24 degrees loss of electrical contact may occur between the plug and 
jack. If the nominal contact angle becomes less than 13 degrees, 
interference between jack contacts and the internal plastic in the plug 
may occur.
5. To avoid loss of electrical contact, the preferred dimension from 
datum B to the highest point ``X'' should be 5.0800 mm (.200 inch) max. 
A dimension greater than 5.3594 mm (.211 inch) may result in loss of 
electrical contact between plugs and jacks. The 5.3594 mm (.211 inch) 
max. shall be considered an absolute maximum.
6. The 24 degree min. angle applies only to plugs with front plastic 
walls higher than 4.8260 mm (.190 inches).

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[[Page 332]]

    (b) Miniature 6-position jack:

    (1) [Reserved]
    [GRAPHIC] [TIFF OMITTED] TC02JN91.039
    

[[Page 333]]

[GRAPHIC] [TIFF OMITTED] TC02JN91.040



[[Page 334]]

Notes: (Notes apply to Figures 68.500(b)(2)(i) and 68.500(b)(3)(i).)

1. Front surface projections beyond the 1.2700 mm (.050 inch) min. shall 
be configured so as not to prevent finger access to the plug release 
catch (Reference Figure 68.500(a)(2)(i), 6-Position Plug, Mechanical 
Specifications). A catch length greater than 1.2700 mm (.050 inch) is 
beneficial in providing greater breakout strength.
2. Surface Z need not be planar or coincident with the surface under the 
plug release catch. Surface Z projections must not prevent insertion, 
latching, and unlatching of the standard 6-position plug described in 
Sec. 68.500(a).
3. The preferred plug stop surface is indicated. If some other internal 
feature is used as a plug stop, it must be located so that the axial 
movement of a latched plug is no greater than 1.1430 mm (0.045 inch).
4. To prevent mistargeting between the plug and jack contacts, the jack 
contacts should be completely contained in their individual contact 
zones, .7112 mm (.028 inch) max. wide, where they extend into the jack 
openings. There is no location requirement for jack contacts below these 
zones 5.8420 mm (.230 inch) max., but adequate contact separation must 
be maintained to prevent electrical breakdown. These shaded contact 
zones should be centrally located, (included all locating tolerances), 
about the jack opening width 9.8806 mm (.389 inch) Ref, (Datum -W-). 
Contacts located outside of these zones may result in mistargeting 
between the jack and plug contacts.
5. All inside and outside corners in the plug cavity to be .3810 mm 
(.015 inch) radius max. unless specified.
6. These surfaces shall have 0 deg.15' maximum draft.
7. Relief inside the dotted areas on 3 sides of the jack opening is 
permitted. The 6.8326 mm (.269 inch) Ref and 9.8806 mm (.389 inch) Ref 
Gauge Requirements must be maintained in each corner, (ref. 1.0160 mm 
(0.040 inch) min), to assure proper plug/jack interface guidance. A 
.8128 mm &177;.1270 mm (.032 inch &177;.005 inch) relief 
on the top side, (opposite plug catch), is required on jacks in 
connecting blocks which mount and connect portable wall telephones so as 
to assure interface with the special purpose sliding modular plug used 
on many wall telephone sets.
8. 4.0640 mm (.160 inch) and 6.5278/6.8580 mm (.257/.270 inch) 
dimensions to be centrally located to jack opening width -W- within 
&177;.1778 mm (0.007 inch).
9. Minimum acceptable jack contact length. When contact guide slots are 
used, the contacts must always be contained inside the guide slots and 
the contacts must move freely in the slots so as not to restrain plug 
insertion or damage jack contacts.
10. Gauge Requirements:

    GO: The jack shall be capable of accepting a 9.7536 x 6.7056 mm 
(0.3840 x 0.2640 inch) gauge and the gauge shall be capable of being 
removed with a maximum force of 8.9 newtons (2 pounds).
    NO GO: The jack shall not accept either a 10.00760 x 6.45160 mm 
(0.3940 x 0.254 inch) horizontal width of opening gauge or a 6.95960 x 
9.5504 mm (.2740 x .376 inch) vertical height of opening gauge. However, 
if either gauge is accepted the force necessary to remove the gauge 
shall be minimum .83 newtons (3.0 ounces).
    Removal forces do not include forces contributed by contact springs 
nor shall external forces be applied to the jack that will affect these 
removal forces.
    Gauges shall have a .7620 mm (.030 inch) radius on the nose and a 
.3810 mm (0.015 inch) radius on all edges with clearance provided for 
contacts.

[[Page 335]]

    (c) Miniature 8-position plug, unkeyed:
    [GRAPHIC] [TIFF OMITTED] TC02JN91.041
    

[[Page 336]]

[GRAPHIC] [TIFF OMITTED] TC02JN91.042



[[Page 337]]

[GRAPHIC] [TIFF OMITTED] TC02JN91.043



[[Page 338]]

Notes: (Notes apply to Figures 68.500(c)(2)(i) and 68.500(c)(2)(ii))

1. All plugs must be capable of meeting the requirements of the plug go 
and no-go gauges.
2. The standard plug height in the area shown is 8.0010 mm (.315 inch) 
maximum. The standard plug length is 23.1140 mm (.910 inch) maximum. 
Plugs may be made longer than standard or adapted for direct use on 
special cords, adapters without cordage, apparatus or equipment subject 
to the limitations described in the introductory paragraphs of 68.500. 
Plugs longer and/or higher than standard may inhibit the special 
features of some network jack enclosures.
3. A 14.6050 mm (.575 inch) minimum tab length is required. It is 
preferred that a maximum tab length be no longer than 15.8750 mm (.625 
inch). Longer tabs may be used with the same limitations described in 
Note 2.
4. To obtain maximum plug guidance in jacks, it is desirable to extend 
the front plug nose to the 2.3368 mm (.092 inch) maximum.
5. These dimensions apply to the location of jack contact receiving 
slots. It is desirable that plug contacts be centered axially in these 
slots, but centering is not required.
6. The center rib centerline shall be coincident with the plug width 
11.6840 mm ref. (.460 inch ref.) centerline within &177;.0762 mm 
(.003 inch).

[[Page 339]]

[GRAPHIC] [TIFF OMITTED] TC02JN91.044



[[Page 340]]

Notes: (Notes apply to Figure 68.500(c)(3)(i))
1. The plug/jack contact interface should be hard gold to hard gold and 
should have a minimum gold thickness of .0012700 mm (.000050 inch) on 
each side of the interface. The minimum contact force should be .98 N 
(100 grams). Any non-gold contact material must be compatible with gold 
and provide equivalent contact performance. A smooth, burr-free surface 
is required at the interface in the area shown.
2. The jack contact design is based upon .4572 mm (.018 inch) spring 
temper phosphor bronze round wire in the modular plug blade and jack 
contact interface. Other contact configurations that provide contact 
performance equal to or better than the preferred configurations and do 
not cause damage to the plug or jack are permitted. The preferred jack 
contact width is .44958/.49530 mm (.0177/.0195 inches). Deviations from 
the preferred jack contact width are permitted for round contacts as 
well as noncircular cross sectional shapes but they must be compatible 
with existing plug configurations. The requirements of Note 1 apply to 
all possible contract areas.
3. The configuration of the plug contact and the front plastic of the 
plug should prevent jack contacts from being damaged during plug 
insertion into jacks.
4. This is the suggested nominal contact angle between plugs and jacks 
with the plug latched into the jack. If this angle becomes greater than 
24 degrees loss of electrical contact may occur between the plug and 
jack. If the nominal contact angle becomes less than 13 degrees, 
interference between jack contacts and the internal plastic in the plug 
may occur.
5. To avoid loss of electrical contact, the preferred dimension from 
datum B to the highest point ``X'' should be 5.0800 mm (.200 inch) max. 
A dimension greater than 5.3594 mm (.211 inch) may result in loss of 
electrical contact between plugs and jacks. The 5.3594 mm (.211 inch) 
max. shall be considered an absolute maximum.
6. The 24 degree min. angle applies only to plugs with front plastic 
walls higher than 4.8260 mm (.190 inches).

[[Page 341]]

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[[Page 342]]

[GRAPHIC] [TIFF OMITTED] TC02JN91.046



[[Page 343]]

    (d) Miniature 8-position series jack:
    [GRAPHIC] [TIFF OMITTED] TC02JN91.047
    

[[Page 344]]

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[[Page 345]]

[GRAPHIC] [TIFF OMITTED] TC02JN91.049



[[Page 346]]

Notes: (Notes apply to Figures 68.500(d)(2)(i) and 68.500(d)(3)(i))

1. Front surface projections beyond the 1.3970 mm (.055 inch) minimum 
shall be configured so as not to prevent finger access to the plug 
release catch (Reference Figure 68.500(a)(2)(i) and Figure 
68.500(c)(2)(i) 6 and 8-Position Plug, Mechanical Specifications). A 
catch length greater than 1.3970 mm (.055 inch) is beneficial in 
providing for greater breakout strength and improved guidance when 
interfacing with a 6-position plug.
2. Surface Z need not be planar or coincident with the surface under the 
plug release catch. Surface Z projections must not prevent insertion, 
latching, and unlatching of the standard 8-position plug on Figure 
68.500(c)(2)(i).
3. The preferred plug stop surface is indicated. If some other internal 
feature is used as a plug stop, it must be located so that the axial 
movement of a latched plug is no greater than 1.1430 mm (.045 inch).
4. To prevent mistargeting between the plug and jack contacts, the jack 
contacts should be completely contained in their individual contact 
zones, (.7112 mm (.028 inch) max. wide), where they extend into the jack 
openings. There is no location requirement for jack contacts below these 
zones (5.8420 mm (.230 inch) max.), but adequate contact separation must 
be maintained to prevent electrical breakdown. These shaded contact 
zones should be centrally located, (include all locating tolerances), 
about the jack opening width 11.9126 mm (.469 inch) Ref, (Datum -W-). 
Contacts located outside of these zones may result in mistargeting 
between the jack and plug contacts.
5. All inside and outside corners in the plug cavity to be .3810 mm 
(.015 inch) radius max. unless specified.
6. These surfaces shall have 0 deg.15' maximum draft.
7. Relief inside the dotted areas on both sides of the jack opening is 
permitted. The 6.8326 mm (.269 inch) Ref and 11.9126 mm (.469 inch) Ref 
Gauge Requirements must be maintained in each of the corners indicated, 
(Ref. 1.5240 mm (.060 inch) min), to assure proper plug/jack interface 
guidance.
8. 4.0640 mm (.160 inch) and 6.2992 mm (0.248 inch) dimensions to be 
centrally located to jack opening width -W- within 
plus-minus-. 1270 mm (.005 inch).
9. The contact lengths shall be such that the contacts will always be 
contained inside the guide slots, and the contacts must move freely in 
the slots so as not to restrain plug insertion or damage jack contacts.
10. Gauge Requirements:

    GO: The jack shall be capable of accepting an 11.7856 x 6.7056 mm 
(.4640 x .2640 inch) gauge and the gauge shall be capable of being 
removed with a maximum force of 8.9 newtons (2.0 pounds).
    NO GO: The jack shall not accept either a 12.0396 x 6.4516 mm (.4740 
x .254 inch) horizontal width of opening gauge or a 6.9596 x 11.5824 mm 
(.2740 x .456 inch vertical height of opening gauge. However, if the 
gauge is accepted, the force necessary to remove the gauge shall be a 
minimum of .83 newtons (3.0 ounces).
    Removal forces do not include forces contributed by contact springs 
nor shall external forces be applied to the jack that will affect these 
removal forces.
    Gauges shall have a .7620 mm (.030 inch) radius on the nose and a 
.3810 mm (.015 inch) radius on all edges with clearance provided for 
contacts.

11. With no plug inserted, conductors 1 and 4 are bridged as well as 
conductors 5 and 8. With a miniature 8-position plug inserted into the 
jack, the bridge connectors are broken and a series connection can be 
made in both sides of the line. With a 6-position plug inserted, the 
bridged connections remain unbroken.
12. The jack contact/bridging interface should be hard gold to hard gold 
and should have a minimum gold thickness of .0012700 mm (.000050 inch) 
on each side of the interface. The minimum contact bridging force should 
be .294 N (30 grams). Any non-gold contact material must be compatible 
with gold and provide equivalent contact performance.
    (e) 50-position miniature ribbon plug:

    (1) Contact finish in the region of contact shall be gold, .0007620 
mm (.000030 inch) minimum thickness, electrodeposited hard gold 
preferred.\1\
---------------------------------------------------------------------------

    \1\ Figure 68.500(e)(1).
---------------------------------------------------------------------------

    (2) ``Datum B'' is the center line of contact cavities.
    (3) The center line of each contact shall be located within .2286 mm 
(.009 inch) of true position with respect to ``Datum B''.\1\
    (4) Contact width at region of contact shall be 
1.1430&177;.0508 mm (.045&177;0.002 inch).\1\
    (5) Center line of shell dimension indicated shall be within .1270 
mm (.005 inch) of ``Datum B''.\1\
    (6) Center line of barrier dimension indicated shall be within .1270 
mm (.005 inch) of ``Datum B''.\1\
    (7) ``Surface X'' shall have a .0001016 mm (4 microinch) finish or 
better; finishing shall be done in the direction of the arrow.\2\
---------------------------------------------------------------------------

    \2\ Figures 68.500 (e)(2) and (e)(3).
---------------------------------------------------------------------------

    (8) A force of not more than 178 newtons (40 pounds) shall be 
sufficient to fully insert the plug onto the sizing gauge shown on 
Figure 68.500(e)(1). The plug is fully inserted when ``Surface A'' of 
the plug \1\ touches ``Surface A'' of the sizing gauge.

[[Page 347]]

    (9) After one insertion of the plug on the sizing gauge, Figure 
68.500(e)(2), a force of not more than 44.5 newtons (10 pounds) shall be 
sufficient to fully insert the plug on the continuity gauge shown in 
Figure 68.500(e)(3). The plug is fully inserted on the continuity gauge 
when ``Surface A'' of the plug \1\ touches ``Surface A'' of the 
continuity gauge.
    (10) When the plug is fully inserted on the continuity gauge, Figure 
68.500(e)(3), after having been inserted once on the sizing gauge, 
Figure 68.500(e)(2), all contacts of the plug shall electrically contact 
the continuity gauge as determined by an electrical continuity test 
which applies an open circuit voltage of not more than 10 volts, and 
will not indicate continuity if the resistance of the circuit being 
checked is more than 200 ohms.

[[Page 348]]

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[[Page 349]]

[GRAPHIC] [TIFF OMITTED] TC02JN91.051



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[[Page 351]]

[GRAPHIC] [TIFF OMITTED] TC02JN91.053



[[Page 352]]

    (f) 50-position miniature ribbon jack:

    (1) Contact finish in the region of contact shall be gold, .0007620 
mm (.000030 inch) minimum thickness, electrodeposited hard gold 
preferred.\1\
---------------------------------------------------------------------------

    \1\ Figure 68.500(f)(1).
---------------------------------------------------------------------------

    (2) ``Datum B'' is the center line of contact cavities.
    (3) The center line of each contact shall be located within .2286 mm 
(.009 inch) of true position with respect to ``Datum B''.\1\
    (4) Contact width at region of contact shall be 
1.1430&177;.0508 mm (.045&177;0.002 inch).\1\
    (5) Center line of shell dimension indicated shall be within .1270 
mm (.005 inch) of ``Datum B''.\1\
    (6) Center line of cavity dimension indicated shall be within .1270 
mm (.005 inch) of ``Datum B''.\1\
    (7) ``Surface X'' shall have a .0001016 mm (4 microinch) finish or 
better; finishing shall be done in the direction of the arrow.\2\
---------------------------------------------------------------------------

    \2\ Figures 68.500 (f)(2) and (f)(3).
---------------------------------------------------------------------------

    (8) A force of not more than 134 newtons (30 pounds) shall be 
sufficient to fully insert the jack onto the sizing gauge shown on 
Figure 68.500(f)(2).
    The jack is fully inserted when ``Surface A'' of the jack \1\ 
touches ``Surface A'' of the sizing gauge.
    (9) After one insertion of the jack on the sizing gauge, Figure 
68.500(f)(2), a force of not more than 44.5 newtons (10 pounds) shall be 
sufficient to fully insert the jack on the continuity gauge shown in 
Figure 68.500(f)(3). The jack is fully inserted on the continuity gauge 
when ``Surface A'' of the jack \1\ touches ``Surface A'' of the 
continuity gauge.
    (10) When the jack is fully inserted on the continuity gauge, Figure 
68.500(f)(3), after having been inserted once on the sizing gauge, all 
contacts of the jack shall electrically contact the continuity gauge as 
determined by an electrical continuity test which applies an open 
circuit voltage of not more than 10 volts, and will not indicate 
continuity if the resistance of the circuit being checked is more than 
200 ohms.

[[Page 353]]

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[GRAPHIC] [TIFF OMITTED] TC02JN91.055



[[Page 355]]

[GRAPHIC] [TIFF OMITTED] TC02JN91.056



[[Page 356]]

    (g) 3-Position weatherproof plug:

    Contact blade material shall be brass, with minimum .00762 mm (.0003 
inch) thick nickel plating.

    Note:  All linear dimensions are in millimeters (inches).

    [GRAPHIC] [TIFF OMITTED] TC02JN91.057
    

[[Page 357]]

[GRAPHIC] [TIFF OMITTED] TC02JN91.058



[[Page 358]]

    (h) 3-Position weatherproof jack:

    Contact blade material shall be brass, with minimum .00762 mm (.0003 
inch) thick nickel plating.

    Note:  All linear dimensions are in millimeters (inches).

    [GRAPHIC] [TIFF OMITTED] TC02JN91.059
    

[[Page 359]]


    (i) Miniature 8-position plug, keyed:
    [GRAPHIC] [TIFF OMITTED] TC02JN91.060
    

[[Page 360]]

[GRAPHIC] [TIFF OMITTED] TC02JN91.061



[[Page 361]]

[GRAPHIC] [TIFF OMITTED] TC02JN91.062



[[Page 362]]

Notes: (Notes apply to Figures 68.500(i)(2) (i) and 68.500(i)(2)(ii))

1. All plugs must be capable of meeting the requirements of the plug go 
and no-go gauges.
2. The standard plug height in the area shown is 8.0010 mm (.315 inch) 
maximum. The standard plug length is 23.1140 mm (.910 inch) maximum. 
Plugs may be made longer than standard or adapted for direct use on 
special cords, adapters without cordage, apparatus or equipment subject 
to the limitations described in the introductory paragraphs of 68.500. 
Plugs longer and/or higher than standard may inhibit the special 
features of some network jack enclosures.
3. A 14.6050 mm (.575 inch) minimum tab length is required. It is 
preferred that maximum tab length be no longer than 15.8750 mm (.625 
inch). Longer tabs may be used with the same limitations described in 
Note 2.
4. To obtain maximum plug guidance in jacks, it is desirable to extend 
the front plug nose to the 2.3368 mm (.092 inch) maximum.
5. These dimensions apply to the location of jack contact receiving 
slots. It is desirable that plug contacts be centered axially in these 
slots, but centering is not required.
6. The center rib centerline shall be coincident with the plug width, 
11.6840 mm ref (.460 inch ref.) center line within &177; .0762 mm 
(&177; .003 inch).

[[Page 363]]

[GRAPHIC] [TIFF OMITTED] TC02JN91.063



[[Page 364]]

Notes: (Notes apply to Figure 68.500(i)(3)(i))

1. The plug/jack contact interface should be hard gold to hard gold and 
should have a minimum gold thickness of .0012700mm (.000050 inch) on 
each side of the interface. The minimum contact force should be .98 N 
(100 grams). Any non-gold contact material must be compatible with gold 
and provide equivalent contact performance. A smooth, burr-free surface 
is required at the interface in the area shown.
2. The jack contact design is based upon .4572 mm (.018 inch) spring 
temper phosphor bronze round wire in the modular plug blade and jack 
contact interface. Other contact configurations that provide contact 
performance equal to or better than the preferred configurations and do 
not cause damage to the plug or jack are permitted. The preferred jack 
contact width is .44958/.49530 mm (.0177/.0195 inches). Deviations from 
the preferred jack contact width are permitted for round contacts as 
well as noncircular cross sectional shapes but they must be compatible 
with existing plug configurations. The requirements of Note 1 apply to 
all possible contact areas.
3. The configuration of the plug contact and the front plastic of the 
plug should prevent jack contacts from being damaged during plug 
insertion into jacks.
4. This is the suggested nominal contact angle between plugs and jacks 
with the plug latched into the jack. If this angle becomes greater than 
24 degrees loss of electrical contact may occur between the plug and 
jack. If the nominal contact angle becomes less than 13 degrees, 
interference between jack contacts and the internal plastic in the plug 
may occur.
5. To avoid loss of electrical contact, the preferred dimension from 
``Datum B'' to the highest point ``X'' should be 5.0800 mm (.200 inch) 
max. A dimension greater than 5.3594 mm (.211 inch) may result in loss 
of electrical contact between plugs and jacks. The 5.3594 mm (.211 inch) 
max. shall be considered an absolute maximum.
6. The 25 degree min. angle applies only to plugs with front plastic 
walls higher than 4.8260 mm (.190 inches).

[[Page 365]]

[GRAPHIC] [TIFF OMITTED] TC02JN91.064



[[Page 366]]

[GRAPHIC] [TIFF OMITTED] TC02JN91.065



[[Page 367]]

    (j) Miniature 8-position keyed jack:
    [GRAPHIC] [TIFF OMITTED] TC02JN91.066
    

[[Page 368]]

[GRAPHIC] [TIFF OMITTED] TC02JN91.067



[[Page 369]]

Notes: (Notes apply to Figure 68.500(j)(2)(i))

1. Front surface projections beyond the 1.3970 mm (.055 inch) minimum 
shall be configured so as not to prevent finger access to the plug 
release catch (Reference Figure 68.500(i)(2)(ii) and 8-Position Plug, 
Mechanical Specifications). A catch length greater than 1.3970 mm (.055 
inch) is beneficial in providing for greater breakout strength and 
improved guidance when interfacing with a 6-position plug.
2. Surface Z need not be planar or coincident with the surface under the 
plug release catch. Surface Z projections must not prevent insertion, 
latching, and unlatching of the standard 8-position plug on Figure 
68.500(i)(2)(i).
3. The preferred plug stop surface is indicated. If some other internal 
feature is used as a plug stop, it must be located so that the axial 
movement of a latched plug is no greater than 1.1430 mm (.045) inch.
4. To prevent mistargeting between the plug and jack contacts, the jack 
contacts should be completely contained in their individual contact 
zones, (.7112 mm (.028 inch) max wide), where they extend into the jack 
openings. There is no location requirement for jack contacts below these 
zones (5.8420 mm (.230 inch) max), but adequate contact separation must 
be maintained to prevent electrical breakdown. These shaded contact 
zones should be centrally located, (include all locating tolerances), 
about the jack opening width 11.9126 mm (.469 inch) Ref, (Datum-W-). 
Contacts located outside of these zones may result in mistargeting 
between the jack and plug contacts.
5. All inside and outside corners in the plug cavity to be .3810 mm 
(.015 inch) radius max unless specified.
6. These surfaces shall have 0 deg.15' maximum draft.
7. Relief inside the dotted areas on both sides of the jack opening is 
permitted. The 6.8326 mm (.269 inch) Ref and 11.9126 mm (.469 inch) Ref 
Gauge Requirements must be maintained in each of the corners indicated, 
(Ref. 1.5240 mm (.060 inch) min), to assure proper plug/jack interface 
guidance.
8. 4.0640 mm (.160 inch) and 6.2992 mm (.248 inch) dimensions to be 
centrally located to jack opening width -W- within &177;.1270 mm 
(.005).
9. The contact lengths shall be such that the contacts will always be 
contained inside the guide slots and the contacts must move freely in 
the slots so as not to restrain plug insertion or damage jack contacts.
10. Gauge Requirements:

    GO: The jack shall be capable of accepting and 11.78560  x  6.70560 
mm (.4640  x  .2640 inch) gauge and the gauge shall be capable of being 
removed with a maximum force of 8.9 newtons (2.0 pounds).
    NO GO: The jack shall not accept either a 12.03960  x  6.4516 mm 
(.4740  x  .254 inch) horizontal width of opening gauge or a 6.95960  x  
11.5824 mm (.2740  x  .456 inch) vertical height of opening gauge. 
However, if the gauge is accepted, the force necessary to remove the 
gauge shall be minimum of .83 newtons (3.0 ounces).
    Removal forces do not include forces contributed by contact springs 
nor shall external forces be applied to the jack that will affect these 
removal forces.
    Gauges shall have a .7620 mm (.030 inch) radius on the nose and a 
.3810 mm (.015 inch) radius on all edges with clearance provided for 
contracts.

[ 41 FR 28699 , July 12, 1976, as amended at  45 FR 52151 , Aug. 6, 1980;  50 FR 27251 , July 2, 1985;  58 FR 44907 , Aug. 25, 1993;  62 FR 36465 , July 8, 
1997]