The Timken Company
The Timken Company
4500 Mt Pleasant St. NW
N. Canton, OH 44720
Phone: (234) 262-3000
E-Mail: CustomerCAD@timken.com • Web site: www.timken.com
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Effective August 21st, 2023, the Naval Air Warfare Center Aircraft Division (NAWCAD) has disapproved Timken Aurora’s qualification status for SAE-AS81820 and SAE-AS81935 specifications. Timken Aurora is working diligently to get requalified.

  • Body - PH 13-8 Mo stainless steel per AMS 5629 - heat treated.
  • Ball - 440C stainless steel per AMS 5630 - heat treated.
  • Optional Ball - 13-8 Mo stainless steel per AMS 5629 - heat treated. (Specify by adding suffix "C" ex.: ATM-3ETC)
  • Race - 17-4 PH stainless steel per AMS 5643 - heat treated.
  • PTFE Liner - (AT 3200) Permanently bonded to race inside diameter, qualified to SAE-AS81820 Type A.
  • Temperature range: -65°F to +325°F
  • No load rotational breakaway torque can be varied to meet specific application requirements.
  • Keyways are available. Units are supplied without keyways. When a keyway is required, specify by adding suffix "K". Ex.: ATMK-3T.
  • As applicable, keyways will conform to SAE-AS81935/3 or NAS 559.
  • All threads are rolled after heat treatment, and conform to UNJF-3A per AS8879.
  • Rod End Bearings listed are manufactured to conform to the dimensions, materials, and configurations of SAE-AS81935/8, and are approved for procurement under this specification.
ASM-T & ASB-T Image
Unit of Measure
1 2 3 4 

Part Number

Thread Type

B - Ball Bore

W - Ball Width

H - Head Width

A - Base to Center

D - Head Diameter

C - Thread Length

Thread Size

Ultimate Radial Static Load Capacity

CAD

ATM-3ET N/A Right Hand N/A .1900 in N/A .281 in N/A .228 in N/A 1.315 in N/A .680 in N/A .775 in N/A 1/4-28 N/A 3,000 lb N/A
ATM-3ETC N/A Right Hand N/A .1900 in N/A .281 in N/A .228 in N/A 1.315 in N/A .680 in N/A .775 in N/A 1/4-28 N/A 3,000 lb N/A
ATB-3ET N/A Left Hand N/A .1900 in N/A .281 in N/A .228 in N/A 1.315 in N/A .680 in N/A .775 in N/A 1/4-28 N/A 3,000 lb N/A
ATB-3ETC N/A Left Hand N/A .1900 in N/A .281 in N/A .228 in N/A 1.315 in N/A .680 in N/A .775 in N/A 1/4-28 N/A 3,000 lb N/A
ATMK-3ET N/A Right Hand N/A .1900 in N/A .281 in N/A .228 in N/A 1.315 in N/A .680 in N/A .775 in N/A 1/4-28 N/A 3,000 lb N/A
ATMK-3ETC N/A Right Hand N/A .1900 in N/A .281 in N/A .228 in N/A 1.315 in N/A .680 in N/A .775 in N/A 1/4-28 N/A 3,000 lb N/A
ATBK-3ET N/A Left Hand N/A .1900 in N/A .281 in N/A .228 in N/A 1.315 in N/A .680 in N/A .775 in N/A 1/4-28 N/A 3,000 lb N/A
ATBK-3ETC N/A Left Hand N/A .1900 in N/A .281 in N/A .228 in N/A 1.315 in N/A .680 in N/A .775 in N/A 1/4-28 N/A 3,000 lb N/A
ATM-4ET N/A Right Hand N/A .2500 in N/A .343 in N/A .260 in N/A 1.443 in N/A .827 in N/A .775 in N/A 1/4-28 N/A 5,300 lb N/A
ATM-4ETC N/A Right Hand N/A .2500 in N/A .343 in N/A .260 in N/A 1.443 in N/A .827 in N/A .775 in N/A 1/4-28 N/A 5,300 lb N/A
ATB-4ET N/A Left Hand N/A .2500 in N/A .343 in N/A .260 in N/A 1.443 in N/A .827 in N/A .775 in N/A 1/4-28 N/A 5,300 lb N/A
ATB-4ETC N/A Left Hand N/A .2500 in N/A .343 in N/A .260 in N/A 1.443 in N/A .827 in N/A .775 in N/A 1/4-28 N/A 5,300 lb N/A
ATMK-4ET N/A Right Hand N/A .2500 in N/A .343 in N/A .260 in N/A 1.443 in N/A .827 in N/A .775 in N/A 1/4-28 N/A 5,300 lb N/A
ATMK-4ETC N/A Right Hand N/A .2500 in N/A .343 in N/A .260 in N/A 1.443 in N/A .827 in N/A .775 in N/A 1/4-28 N/A 5,300 lb N/A
ATBK-4ET N/A Left Hand N/A .2500 in N/A .343 in N/A .260 in N/A 1.443 in N/A .827 in N/A .775 in N/A 1/4-28 N/A 5,300 lb N/A
ATBK-4ETC N/A Left Hand N/A .2500 in N/A .343 in N/A .260 in N/A 1.443 in N/A .827 in N/A .775 in N/A 1/4-28 N/A 5,300 lb N/A
ATM-5ET N/A Right Hand N/A .3125 in N/A .375 in N/A .291 in N/A 1.948 in N/A .984 in N/A 1.187 in N/A 5/16-24 N/A 8,600 lb N/A
ATM-5ETC N/A Right Hand N/A .3125 in N/A .375 in N/A .291 in N/A 1.948 in N/A .984 in N/A 1.187 in N/A 5/16-24 N/A 8,600 lb N/A
ATB-5ET N/A Left Hand N/A .3125 in N/A .375 in N/A .291 in N/A 1.948 in N/A .984 in N/A 1.187 in N/A 5/16-24 N/A 8,600 lb N/A
ATB-5ETC N/A Left Hand N/A .3125 in N/A .375 in N/A .291 in N/A 1.948 in N/A .984 in N/A 1.187 in N/A 5/16-24 N/A 8,600 lb N/A
ATMK-5ET N/A Right Hand N/A .3125 in N/A .375 in N/A .291 in N/A 1.948 in N/A .984 in N/A 1.187 in N/A 5/16-24 N/A 8,600 lb N/A
ATMK-5ETC N/A Right Hand N/A .3125 in N/A .375 in N/A .291 in N/A 1.948 in N/A .984 in N/A 1.187 in N/A 5/16-24 N/A 8,600 lb N/A
ATBK-5ET N/A Left Hand N/A .3125 in N/A .375 in N/A .291 in N/A 1.948 in N/A .984 in N/A 1.187 in N/A 5/16-24 N/A 8,600 lb N/A
ATBK-5ETC N/A Left Hand N/A .3125 in N/A .375 in N/A .291 in N/A 1.948 in N/A .984 in N/A 1.187 in N/A 5/16-24 N/A 8,600 lb N/A
ATM-6ET N/A Right Hand N/A .3750 in N/A .406 in N/A .322 in N/A 2.030 in N/A 1.131 in N/A 1.187 in N/A 3/8-24 N/A 13,000 lb N/A
Unit of Measure
1 2 3 4