Howmet Aerospace - RLR Series Lock Rings

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RLR Type lockrings have been inactive for new design since 1969 and are superseded by the improved "RLRR" type lockrings. "RLR" type lockrings will be provided for existing designs, however, it will normally be advantageous from a price and delivery standpoint to substitute the "RLRR" type lockring (ref. MS51990).

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Unit of Measure

Items	RLR16SA5 RLR Series Lock Rings	RLR18SA6 RLR Series Lock Rings	RLR21SA6 RLR Series Lock Rings	RLR23SA7 RLR Series Lock Rings	RLR24SA7 RLR Series Lock Rings
Basic Lockring Size	N/A 16	N/A 18	N/A 21	N/A 23	N/A 24
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 0.274 in	N/A 0.308 in	N/A 0.354 in	N/A 0.389 in	N/A 0.399 in
B - Dia +.004 -.003	N/A 0.161 in	N/A 0.189 in	N/A 0.213 in	N/A 0.266 in	N/A 0.266 in
C - Thickness	N/A 0.084 in	N/A 0.099 in	N/A 0.099 in	N/A 0.123 in	N/A 0.112 in
D - Dia	N/A 0.223 in	N/A 0.255 in	N/A 0.298 in	N/A 0.343 in	N/A 0.343 in
E - Nr. of External Serrations (Total Teeth), Approx	N/A 15.000	N/A 15.000	N/A 18.000	N/A 18.000	N/A 18.000
F - Nr. of Internal Serrations	N/A 14.000	N/A 16.000	N/A 13.000	N/A 17.000	N/A 17.000
R - Radius	N/A 0.120 in	N/A 0.135 in	N/A 0.159 in	N/A 0.178 in	N/A 0.180 in
¹ The Preferred Alloy Steel Material is the 4130, 4140 or 8740 (SA code).