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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.
Unit of Measure

Key Dimensions

Part Number

 N/A ATB-8ETC

SAE Part Number

N/A M81935/8-08CL

Thread Type

 N/A Left Hand

Thread Configuration

 N/A Male

B - Ball Bore

 N/A .5000 in

W - Ball Width

 N/A .500 in

H - Head Width

 N/A .400 in

A - Base to Center

 N/A 2.544 in

D - Head Diameter

 N/A 1.459 in

O - Ball Shoulder Diameter

 N/A .600 in

S - Max. Housing I.D.

 N/A 1.0000 in

Ball Diameter

 N/A .781 in

C - Thread Length

 N/A 1.468 in

Thread Size

 N/A 1/2-20

Thread Class

 N/A UNJF-3A-LH

a - Misalignment Angle

 N/A 8 º

Approximate Brg. Weight

N/A .285 lb

Ultimate Radial Static Load Capacity

 N/A 24,200 lb

Fatique Load

 N/A 6,800 lb

Axial Proof Load

 N/A 2,040 lb

No Load Rotational Breakaway Torque

 N/A 1 to 15 in·lb

Note

 N/A For dimensional tolerances of listed features, see the PDF version of the catalog under the "View Product Catalogs" tab from the home page.