Item # RL27SS8, RL Series Lock Rings On Howmet Aerospace

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Superseded by RL28( )8 for new design and applications where it is agreeable by customer to increase counterbore diameter.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
Notes

Series	N/A RL
Basic Lockring Size	N/A 27
Material Type¹	N/A 4340 Steel
Material Specification	N/A AMS-S-5000
Heat Treat	N/A 150-165 KSI UTS
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

¹ The Preferred Alloy Steel Material is the 4130, 4140 or 8740 (SA code).

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Series

Basic Lockring Size

Material Specification

Heat Treat

Finish

A - Dia +.005 -.004

B - Dia +.004 -.003

C - Thickness

D - Dia

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

F - Nr. of Internal Serrations