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Superseded by RL28( )8 for new design and applications where it is agreeable by customer to increase counterbore diameter. RL27( )8 will continue to be supplied for existing designs as required.

Unit of Measure

Series

 N/A RL

Basic Lockring Size

 N/A 27
Material Type1 N/A 4130 Steel or 4140 Steel or 8740 Steel

Material Specification

 N/A AMS 6370 (4130 Steel), AMS 6382 (4140 Steel), AMS 6322 (8740 Steel)

Heat Treat

 N/A 36-45 HRc per AMS 2759

Finish

 N/A Cadmium Plate per AMS-QQ-P-416, Type II, Class 3

A - Dia +.005 -.004

 N/A 0.452 in

B - Dia +.004 -.003

 N/A 0.323 in

C - Thickness

 N/A 0.138 in

D - Dia

 N/A 0.400 in

E - Nr. of External Serrations (Total Teeth), Approx

 N/A 26.000

F - Nr. of Internal Serrations

 N/A 20.000

N/A

  • Fillets rad 0.015 max.
  • Unless otherwise specified, break sharp edges 0.003-0.015, except serrations.
  • 1 The Preferred Alloy Steel Material is the 4130, 4140 or 8740 (SA code).