SAE AS4108-2B-2025

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AEROSPACE STANDARD

T-BOLT, A-286, 1000 °F

BUSHING HEAD

AS4108™/2

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ISSUED 1991-07 REAFFIRMED 2015-04 REVISED 2025-11

THIRD ANGLE PROJECTION

CUSTODIAN: G-3/G-3A

REV.

FEDERAL SUPPLY CLASS

5306

AS4108™/2

SHEET 1 OF 3

REV.

PROCUREMENT SPECIFICATION: AS4108 /12/

SAE Executive Standards Committee Rules provide that: “ This report is published by SAE to advance the state of technical and engineering sciences. The use of this report is

entirely voluntary, and its applicability and suitability for any particular use, including any patent infringement arising therefrom, is the sole responsibility of the user.”

SAE reviews each technical report at least every five years at which time it may be revised, reaffirmed, stabilized, or cancelled. SAE invites your written comments and suggestions.

For more information on this standard, visit

https://www.sae.org/standards/content/AS4108/2B/

RATIONALE

PROCUREMENT SPECIFICATION NOTE REVISED FROM QML REQUIREMENT TO USER CONTROLLED

REQUIREMENT.

FIGURE 1

- A -

2 MAX

IMPERFECT

THREADS

92°

89° U X 45°

THREAD

ROOT DIA

THREA D /10/

MAJO R DIA

ELECTRO CHEM ETCH

MANUFACTURER'S NAME

OR T RADEMARK AND AS

IDENTITY PER AS478-7A1

BUSHING

ØD

ØB

/4/

OPTIONAL CURVED T-BOLT /4/, /13/

(DIMENSIONS SAME AS STRAIGHT T-BOLT

EXCEPT AS NOTED)

"Y" A

"X" / 1.00

/9/

L /10/

TOL

AEROSPACE STANDARD AS4108™/2

SHEET 2 OF 3

REV.

T-BOLT, A-286, 1000 °F

BUSHING HEAD

TABLE 1A - DIMENSIONS B-Y

BASIC

NUMBER

AS4108/2

SIZE CODE

/11/ /13/

THREAD SIZE

PER AS8879

CLASS 3A B D

GRIP

/4/

/4/ U X Y

3 .1900-32 UNJF .29 .164-.190 .66- .84 .660 .500 .040 .0030 .005

4 .2500-28 UNJF .35 .244-.250 1.03-1.09 1.120 .840 .040 .0030 .005

5 .3125-24 UNJF .41 .297-.312 1.28-1.53 -- -- .050 .0030 .006

6 .3750-24 UNJF .51 .350-.375 1.97-2.09 -- -- .050 .0025 .009

8 .5000-20 UNJF .66 .480-.499 1.97-2.03 -- -- .060 .0020 .010

TABLE 1B - LENGTH L /8/

BASIC

NUMBER

AS4108/2

SIZE CODE

/9/ /13/

ALLOWABLE LENGTH CODES

IN HUNDREDTH INCHES

(200 = 2.00 INCHES)

3 175 200 225 250 -- -- -- -- -- -- -- -- -- -- --

4 -- -- 225 250 275 300 350 -- -- -- -- -- -- -- --

5 -- -- -- -- -- -- 350 400 450 -- 550 -- -- -- --

6 -- -- -- -- -- -- 350 400 450 500 550 575 600 -- --

8 -- -- --- -- -- -- -- 400 450 500 550 -- 600 650 700

TABLE 1C - T-HEAD BUSHING LENGTH CODES

IN .125 INCH INCREMENTS /9/

BASIC

NUMBER

AS4108/2

SIZE CODE

/9/ /13/ .500 .625 .750 .875 1.000 1.125 1.250 1.375 1.500 1.750 1.875 2.000

3 4 5 6 -- -- -- -- -- -- -- -- --

4 -- 5 6 7 8 -- -- -- -- -- -- --

5 -- -- 6 7 8 -- -- -- -- -- -- --

6 -- -- -- -- 8 9 10 11 12 -- -- --

8 -- -- -- -- -- -- -- -- -- 14 15 16

BASIC

NUMBER

AS4108/2

SIZE CODE

/9/ /13/ 4 5 6 7 8 9 10 11 12 14 15 16

3 .500 .625 .750 -- -- -- -- -- -- -- -- --

4 -- .625 .750 .875 1.000 -- -- -- -- -- -- --

5 -- -- .750 .875 1.000 -- -- -- -- -- -- --

6 -- -- -- -- 1.000 1.125 1.250 1.375 1.500 -- -- --

8 -- -- -- -- -- -- -- -- -- 1.750 1.875 2.000

AEROSPACE STANDARD AS4108™/2

SHEET 3 OF 3

REV.

T-BOLT, A-286, 1000 °F

BUSHING HEAD

NOTES:

1. MATERIAL:

BOLT: A-286 CORROSION-RESISTING STEEL PER AMS5731, AMS5732, OR AMS5737 (UNS S66286).

BUSHING: A-286 PER AMS5525 (UNS 66286).

2. BOLT HEAT TREATMENT: 160000 MINIMUM ULTIMATE TENSILE STRENGTH AT ROOM TEMPERATURE.

3. FINISH: PASSIVATE PER AMS2700.

/4/ WHEN SPECIFIED, BOLT BEND ANGLE SHALL BE 18° OR 30° AS DESIGNATED BY PART NUMBER (SEE PART NUMBER CODE

/13/). CURVED OPTION NOT AVAILABLE ON -5 AND LARGER.

5. DIMENSIONS ARE IN INCHES. UNLESS OTHERWISE SPECIFIED, LINEAR TOLERANCES: .XX = ±.03, .XXX = ±.010, ANGLES = ±1°.

6. PARTS SHALL BE FREE FROM BURRS AND SLIVERS.

7. DIMENSIONING AND TOLERANCING: ANSI Y14.5M-1982.

8. THREADS SHALL BE IN ACCORDANCE WITH AS8879.

/9/ A = T-HEAD BUSHING LENGTH IN .125 INCH INCREMENTS.

/10/ L = LENGTH IN HUNDREDTH INCHES.

/11/ BOLT SIZE = BOLT DIAMETER IN .0625 INCH INCREMENTS.

/12/ PROCUREMENT SPECIFICATION: AS4108, EXCEPT AS SPECIFIED IN THIS STANDARD. PRODUCT MANUFACTURED TO THIS

STANDARD SHALL MEET THE REQUIREMENTS SPECIFIED HEREIN AND THE PROCUREMENT SPECIFICATION. USERS OF THIS

STANDARD ARE ADVISED TO CONTROL SOURCE APPROVAL(S) BY STANDARD PAGE SUPPLEMENT SHEETS OR SIMILAR

MEANS.

/13/ EXAMPLE OF PART NUMBER: AS4108/2C32006

T-BOLT: .1900-32 UNJF-3A, CURVED 18°, 2.00 INCHES LONG WITH .750 WIDE BUSHING

AS4108/2 C 3 200 6

T-HEAD BUSHING LENGTH IN .125 INCH INCREMENTS

(6 X .125 = .750) /9/

T-BOLT LENGTH IN HUNDREDTH INCH INCREMENTS

(200 = 2.00 INCHES) /10/

SIZE CODE (NOMINAL DIAMETER OF T-BOLT, BOLT SIZE) /11/

“-” = STRAIGHT SHANK /4/

C = 18° CURVED SHANK /4/

S = 30° CURVED SHANK /4/

BASIC PART NUMBER

14. REVISION INDICATOR: A CHANGE BAR (I) LOCATED IN THE LEFT MARGIN IS FOR THE CONVENIENCE OF THE USER IN

LOCATING AREAS WHERE TECHNICAL REVISIONS, NOT EDITORIAL CHANGES, HAVE BEEN MADE TO THE PREVIOUS ISSUE OF

THIS DOCUMENT. AN (R) SYMBOL TO THE LEFT OF THE DOCUMENT TITLE INDICATES A COMPLETE REVISION OF THE

DOCUMENT, INCLUDING TECHNICAL REVISIONS. CHANGE BARS AND (R) ARE NOT USED IN ORIGINAL PUBLICATIONS, NOR IN

DOCUMENTS THAT CONTAIN EDITORIAL CHANGES ONLY.

15. INVENTORIED PARTS CONFORMING TO THE PREVIOUS LETTER CHANGE MAY BE USED TO DEPLETION.

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摘要：

SAE AS4108-2B-2025 是国际自动机工程师学会（SAE International）发布的最新版本航空航天电气连接器标准规范。该标准主要针对飞机及航天器系统中使用的圆形电连接器的尺寸、性能、耐久性与环境适应性提出严格要求，适用于高可靠性电力与信号传输场景。相比于前一版本，2B版更新了插拔寿命测试方法、材料耐腐蚀等级以及接触电阻公差，以确保连接器在极端温度、振动与潮湿条件下仍能稳定工作。该标准对航空航天设计工程师、质量检验人员及供应链采购方具有重要参考价值，有助于提升飞行器电气系统的安全性与互操作性。

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