Howmet Fastening Systems
Howmet Fastening Systems
Phone: Sales +1 800 992 4444
Technical Support +1 310 784 6409
Email: HFSTechSupport@howmet.com
Website: www.hfs.howmet.com
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Superseded by RL28( )8 for new design and applications where it is agreeable by customer to increase counterbore diameter.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

Specifications

Series

 N/A RL

Basic Lockring Size

 N/A 27
Material Type1 N/A A286 CRES

Material Specification

 N/A AMS 5731 or AMS 5732 or AMS 5734 or AMS 5737

Heat Treat

 N/A 32-40 HRc

Finish

 N/A Passivate per AMS2700

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

Notes

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).