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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RL Series Lock Rings
Unit of Measure
1 2 3 4 

Item #

Basic Lockring Size

Material Type

Material Specification

Heat Treat

Finish

C - Thickness

RL16SA5 N/A 16 N/A 4130 Steel or 4140 Steel or 8740 Steel N/A AMS 6370 (4130 Steel), AMS 6382 (4140 Steel), AMS 6322 (8740 Steel) N/A 36-45 HRc per AMS 2759 N/A Cadmium Plate per AMS-QQ-P-416, Type II, Class 3 N/A 0.084 in
RL16SM5 N/A 16 N/A 303 Se CRES N/A ASTM A582 or AMS 5640 N/A None N/A Passivate per AMS2700 N/A 0.084 in
RL16SU5 N/A 16 N/A A286 CRES N/A AMS 5731 or AMS 5732 or AMS 5734 or AMS 5737 N/A 32-40 HRc N/A Passivate per AMS2700 N/A 0.084 in
RL16S3C5 N/A 16 N/A 718 CRES N/A AMS 5662 N/A 230 KSI UTS Min N/A Passivate per AMS2700 N/A 0.084 in
RL16SS5 N/A 16 N/A 4340 Steel N/A AMS-S-5000 N/A 150-165 KSI UTS N/A Cadmium Plate per AMS-QQ-P-416, Type II, Class 3 N/A 0.084 in
RL18SA6 N/A 18 N/A 4130 Steel or 4140 Steel or 8740 Steel N/A AMS 6370 (4130 Steel), AMS 6382 (4140 Steel), AMS 6322 (8740 Steel) N/A 36-45 HRc per AMS 2759 N/A Cadmium Plate per AMS-QQ-P-416, Type II, Class 3 N/A 0.099 in
RL18SM6 N/A 18 N/A 303 Se CRES N/A ASTM A582 or AMS 5640 N/A None N/A Passivate per AMS2700 N/A 0.099 in
RL18SU6 N/A 18 N/A A286 CRES N/A AMS 5731 or AMS 5732 or AMS 5734 or AMS 5737 N/A 32-40 HRc N/A Passivate per AMS2700 N/A 0.099 in
RL18S3C6 N/A 18 N/A 718 CRES N/A AMS 5662 N/A 230 KSI UTS Min N/A Passivate per AMS2700 N/A 0.099 in
RL18SS6 N/A 18 N/A 4340 Steel N/A AMS-S-5000 N/A 150-165 KSI UTS N/A Cadmium Plate per AMS-QQ-P-416, Type II, Class 3 N/A 0.099 in
RL21SA4 N/A 21 N/A 4130 Steel or 4140 Steel or 8740 Steel N/A AMS 6370 (4130 Steel), AMS 6382 (4140 Steel), AMS 6322 (8740 Steel) N/A 36-45 HRc per AMS 2759 N/A Cadmium Plate per AMS-QQ-P-416, Type II, Class 3 N/A 0.068 in
RL21SM4 N/A 21 N/A 303 Se CRES N/A ASTM A582 or AMS 5640 N/A None N/A Passivate per AMS2700 N/A 0.068 in
RL21SU4 N/A 21 N/A A286 CRES N/A AMS 5731 or AMS 5732 or AMS 5734 or AMS 5737 N/A 32-40 HRc N/A Passivate per AMS2700 N/A 0.068 in
RL21S3C4 N/A 21 N/A 718 CRES N/A AMS 5662 N/A 230 KSI UTS Min N/A Passivate per AMS2700 N/A 0.068 in
RL21SS4 N/A 21 N/A 4340 Steel N/A AMS-S-5000 N/A 150-165 KSI UTS N/A Cadmium Plate per AMS-QQ-P-416, Type II, Class 3 N/A 0.068 in
RL21SA6 N/A 21 N/A 4130 Steel or 4140 Steel or 8740 Steel N/A AMS 6370 (4130 Steel), AMS 6382 (4140 Steel), AMS 6322 (8740 Steel) N/A 36-45 HRc per AMS 2759 N/A Cadmium Plate per AMS-QQ-P-416, Type II, Class 3 N/A 0.099 in
RL21SM6 N/A 21 N/A 303 Se CRES N/A ASTM A582 or AMS 5640 N/A None N/A Passivate per AMS2700 N/A 0.099 in
RL21SU6 N/A 21 N/A A286 CRES N/A AMS 5731 or AMS 5732 or AMS 5734 or AMS 5737 N/A 32-40 HRc N/A Passivate per AMS2700 N/A 0.099 in
RL21S3C6 N/A 21 N/A 718 CRES N/A AMS 5662 N/A 230 KSI UTS Min N/A Passivate per AMS2700 N/A 0.099 in
RL21SS6 N/A 21 N/A 4340 Steel N/A AMS-S-5000 N/A 150-165 KSI UTS N/A Cadmium Plate per AMS-QQ-P-416, Type II, Class 3 N/A 0.099 in
RL23SA7 N/A 23 N/A 4130 Steel or 4140 Steel or 8740 Steel N/A AMS 6370 (4130 Steel), AMS 6382 (4140 Steel), AMS 6322 (8740 Steel) N/A 36-45 HRc per AMS 2759 N/A Cadmium Plate per AMS-QQ-P-416, Type II, Class 3 N/A 0.123 in
RL23SM7 N/A 23 N/A 303 Se CRES N/A ASTM A582 or AMS 5640 N/A None N/A Passivate per AMS2700 N/A 0.123 in
RL23SU7 N/A 23 N/A A286 CRES N/A AMS 5731 or AMS 5732 or AMS 5734 or AMS 5737 N/A 32-40 HRc N/A Passivate per AMS2700 N/A 0.123 in
RL23S3C7 N/A 23 N/A 718 CRES N/A AMS 5662 N/A 230 KSI UTS Min N/A Passivate per AMS2700 N/A 0.123 in
RL23SS7 N/A 23 N/A 4340 Steel N/A AMS-S-5000 N/A 150-165 KSI UTS N/A Cadmium Plate per AMS-QQ-P-416, Type II, Class 3 N/A 0.123 in
RL24SA5 N/A 24 N/A 4130 Steel or 4140 Steel or 8740 Steel N/A AMS 6370 (4130 Steel), AMS 6382 (4140 Steel), AMS 6322 (8740 Steel) N/A 36-45 HRc per AMS 2759 N/A Cadmium Plate per AMS-QQ-P-416, Type II, Class 3 N/A 0.081 in
RL24SM5 N/A 24 N/A 303 Se CRES N/A ASTM A582 or AMS 5640 N/A None N/A Passivate per AMS2700 N/A 0.081 in
RL24SU5 N/A 24 N/A A286 CRES N/A AMS 5731 or AMS 5732 or AMS 5734 or AMS 5737 N/A 32-40 HRc N/A Passivate per AMS2700 N/A 0.081 in
RL24S3C5 N/A 24 N/A 718 CRES N/A AMS 5662 N/A 230 KSI UTS Min N/A Passivate per AMS2700 N/A 0.081 in
RL24SS5 N/A 24 N/A 4340 Steel N/A AMS-S-5000 N/A 150-165 KSI UTS N/A Cadmium Plate per AMS-QQ-P-416, Type II, Class 3 N/A 0.081 in
RL24SA7 N/A 24 N/A 4130 Steel or 4140 Steel or 8740 Steel N/A AMS 6370 (4130 Steel), AMS 6382 (4140 Steel), AMS 6322 (8740 Steel) N/A 36-45 HRc per AMS 2759 N/A Cadmium Plate per AMS-QQ-P-416, Type II, Class 3 N/A 0.112 in
RL24SM7 N/A 24 N/A 303 Se CRES N/A ASTM A582 or AMS 5640 N/A None N/A Passivate per AMS2700 N/A 0.112 in
RL24SU7 N/A 24 N/A A286 CRES N/A AMS 5731 or AMS 5732 or AMS 5734 or AMS 5737 N/A 32-40 HRc N/A Passivate per AMS2700 N/A 0.112 in
RL24S3C7 N/A 24 N/A 718 CRES N/A AMS 5662 N/A 230 KSI UTS Min N/A Passivate per AMS2700 N/A 0.112 in
RL24SS7 N/A 24 N/A 4340 Steel N/A AMS-S-5000 N/A 150-165 KSI UTS N/A Cadmium Plate per AMS-QQ-P-416, Type II, Class 3 N/A 0.112 in
RL27SA8 N/A 27 N/A 4130 Steel or 4140 Steel or 8740 Steel N/A AMS 6370 (4130 Steel), AMS 6382 (4140 Steel), AMS 6322 (8740 Steel) N/A 36-45 HRc per AMS 2759 N/A Cadmium Plate per AMS-QQ-P-416, Type II, Class 3 N/A 0.138 in
RL27SM8 N/A 27 N/A 303 Se CRES N/A ASTM A582 or AMS 5640 N/A None N/A Passivate per AMS2700 N/A 0.138 in
RL27SU8 N/A 27 N/A A286 CRES N/A AMS 5731 or AMS 5732 or AMS 5734 or AMS 5737 N/A 32-40 HRc N/A Passivate per AMS2700 N/A 0.138 in
RL27S3C8 N/A 27 N/A 718 CRES N/A AMS 5662 N/A 230 KSI UTS Min N/A Passivate per AMS2700 N/A 0.138 in
RL27SS8 N/A 27 N/A 4340 Steel N/A AMS-S-5000 N/A 150-165 KSI UTS N/A Cadmium Plate per AMS-QQ-P-416, Type II, Class 3 N/A 0.138 in
RL28SA5 N/A 28 N/A 4130 Steel or 4140 Steel or 8740 Steel N/A AMS 6370 (4130 Steel), AMS 6382 (4140 Steel), AMS 6322 (8740 Steel) N/A 36-45 HRc per AMS 2759 N/A Cadmium Plate per AMS-QQ-P-416, Type II, Class 3 N/A 0.081 in
RL28SM5 N/A 28 N/A 303 Se CRES N/A ASTM A582 or AMS 5640 N/A None N/A Passivate per AMS2700 N/A 0.081 in
RL28SU5 N/A 28 N/A A286 CRES N/A AMS 5731 or AMS 5732 or AMS 5734 or AMS 5737 N/A 32-40 HRc N/A Passivate per AMS2700 N/A 0.081 in
RL28S3C5 N/A 28 N/A 718 CRES N/A AMS 5662 N/A 230 KSI UTS Min N/A Passivate per AMS2700 N/A 0.081 in
RL28SS5 N/A 28 N/A 4340 Steel N/A AMS-S-5000 N/A 150-165 KSI UTS N/A Cadmium Plate per AMS-QQ-P-416, Type II, Class 3 N/A 0.081 in
RL28SA6 N/A 28 N/A 4130 Steel or 4140 Steel or 8740 Steel N/A AMS 6370 (4130 Steel), AMS 6382 (4140 Steel), AMS 6322 (8740 Steel) N/A 36-45 HRc per AMS 2759 N/A Cadmium Plate per AMS-QQ-P-416, Type II, Class 3 N/A 0.099 in
RL28SM6 N/A 28 N/A 303 Se CRES N/A ASTM A582 or AMS 5640 N/A None N/A Passivate per AMS2700 N/A 0.099 in
RL28SU6 N/A 28 N/A A286 CRES N/A AMS 5731 or AMS 5732 or AMS 5734 or AMS 5737 N/A 32-40 HRc N/A Passivate per AMS2700 N/A 0.099 in
RL28S3C6 N/A 28 N/A 718 CRES N/A AMS 5662 N/A 230 KSI UTS Min N/A Passivate per AMS2700 N/A 0.099 in
RL28SS6 N/A 28 N/A 4340 Steel N/A AMS-S-5000 N/A 150-165 KSI UTS N/A Cadmium Plate per AMS-QQ-P-416, Type II, Class 3 N/A 0.099 in
RL28SA8 N/A 28 N/A 4130 Steel or 4140 Steel or 8740 Steel N/A AMS 6370 (4130 Steel), AMS 6382 (4140 Steel), AMS 6322 (8740 Steel) N/A 36-45 HRc per AMS 2759 N/A Cadmium Plate per AMS-QQ-P-416, Type II, Class 3 N/A 0.138 in
RL28SM8 N/A 28 N/A 303 Se CRES N/A ASTM A582 or AMS 5640 N/A None N/A Passivate per AMS2700 N/A 0.138 in
RL28SU8 N/A 28 N/A A286 CRES N/A AMS 5731 or AMS 5732 or AMS 5734 or AMS 5737 N/A 32-40 HRc N/A Passivate per AMS2700 N/A 0.138 in
RL28S3C8 N/A 28 N/A 718 CRES N/A AMS 5662 N/A 230 KSI UTS Min N/A Passivate per AMS2700 N/A 0.138 in
RL28SS8 N/A 28 N/A 4340 Steel N/A AMS-S-5000 N/A 150-165 KSI UTS N/A Cadmium Plate per AMS-QQ-P-416, Type II, Class 3 N/A 0.138 in
RL31SA9 N/A 31 N/A 4130 Steel or 4140 Steel or 8740 Steel N/A AMS 6370 (4130 Steel), AMS 6382 (4140 Steel), AMS 6322 (8740 Steel) N/A 36-45 HRc per AMS 2759 N/A Cadmium Plate per AMS-QQ-P-416, Type II, Class 3 N/A 0.145 in
RL31SM9 N/A 31 N/A 303 Se CRES N/A ASTM A582 or AMS 5640 N/A None N/A Passivate per AMS2700 N/A 0.145 in
RL31SU9 N/A 31 N/A A286 CRES N/A AMS 5731 or AMS 5732 or AMS 5734 or AMS 5737 N/A 32-40 HRc N/A Passivate per AMS2700 N/A 0.145 in
RL31S3C9 N/A 31 N/A 718 CRES N/A AMS 5662 N/A 230 KSI UTS Min N/A Passivate per AMS2700 N/A 0.145 in
RL31SS9 N/A 31 N/A 4340 Steel N/A AMS-S-5000 N/A 150-165 KSI UTS N/A Cadmium Plate per AMS-QQ-P-416, Type II, Class 3 N/A 0.145 in
RL33SA6 N/A 33 N/A 4130 Steel or 4140 Steel or 8740 Steel N/A AMS 6370 (4130 Steel), AMS 6382 (4140 Steel), AMS 6322 (8740 Steel) N/A 36-45 HRc per AMS 2759 N/A Cadmium Plate per AMS-QQ-P-416, Type II, Class 3 N/A 0.099 in
RL33SM6 N/A 33 N/A 303 Se CRES N/A ASTM A582 or AMS 5640 N/A None N/A Passivate per AMS2700 N/A 0.099 in
RL33SU6 N/A 33 N/A A286 CRES N/A AMS 5731 or AMS 5732 or AMS 5734 or AMS 5737 N/A 32-40 HRc N/A Passivate per AMS2700 N/A 0.099 in
RL33S3C6 N/A 33 N/A 718 CRES N/A AMS 5662 N/A 230 KSI UTS Min N/A Passivate per AMS2700 N/A 0.099 in
RL33SS6 N/A 33 N/A 4340 Steel N/A AMS-S-5000 N/A 150-165 KSI UTS N/A Cadmium Plate per AMS-QQ-P-416, Type II, Class 3 N/A 0.099 in
RL33SA7 N/A 33 N/A 4130 Steel or 4140 Steel or 8740 Steel N/A AMS 6370 (4130 Steel), AMS 6382 (4140 Steel), AMS 6322 (8740 Steel) N/A 36-45 HRc per AMS 2759 N/A Cadmium Plate per AMS-QQ-P-416, Type II, Class 3 N/A 0.115 in
RL33SM7 N/A 33 N/A 303 Se CRES N/A ASTM A582 or AMS 5640 N/A None N/A Passivate per AMS2700 N/A 0.115 in
RL33SU7 N/A 33 N/A A286 CRES N/A AMS 5731 or AMS 5732 or AMS 5734 or AMS 5737 N/A 32-40 HRc N/A Passivate per AMS2700 N/A 0.115 in
RL33S3C7 N/A 33 N/A 718 CRES N/A AMS 5662 N/A 230 KSI UTS Min N/A Passivate per AMS2700 N/A 0.115 in
RL33SS7 N/A 33 N/A 4340 Steel N/A AMS-S-5000 N/A 150-165 KSI UTS N/A Cadmium Plate per AMS-QQ-P-416, Type II, Class 3 N/A 0.115 in
RL33SA9 N/A 33 N/A 4130 Steel or 4140 Steel or 8740 Steel N/A AMS 6370 (4130 Steel), AMS 6382 (4140 Steel), AMS 6322 (8740 Steel) N/A 36-45 HRc per AMS 2759 N/A Cadmium Plate per AMS-QQ-P-416, Type II, Class 3 N/A 0.145 in
RL33SM9 N/A 33 N/A 303 Se CRES N/A ASTM A582 or AMS 5640 N/A None N/A Passivate per AMS2700 N/A 0.145 in
RL33SU9 N/A 33 N/A A286 CRES N/A AMS 5731 or AMS 5732 or AMS 5734 or AMS 5737 N/A 32-40 HRc N/A Passivate per AMS2700 N/A 0.145 in
RL33S3C9 N/A 33 N/A 718 CRES N/A AMS 5662 N/A 230 KSI UTS Min N/A Passivate per AMS2700 N/A 0.145 in
RL33SS9 N/A 33 N/A 4340 Steel N/A AMS-S-5000 N/A 150-165 KSI UTS N/A Cadmium Plate per AMS-QQ-P-416, Type II, Class 3 N/A 0.145 in
RL38SA7 N/A 38 N/A 4130 Steel or 4140 Steel or 8740 Steel N/A AMS 6370 (4130 Steel), AMS 6382 (4140 Steel), AMS 6322 (8740 Steel) N/A 36-45 HRc per AMS 2759 N/A Cadmium Plate per AMS-QQ-P-416, Type II, Class 3 N/A 0.115 in
RL38SM7 N/A 38 N/A 303 Se CRES N/A ASTM A582 or AMS 5640 N/A None N/A Passivate per AMS2700 N/A 0.115 in
RL38SU7 N/A 38 N/A A286 CRES N/A AMS 5731 or AMS 5732 or AMS 5734 or AMS 5737 N/A 32-40 HRc N/A Passivate per AMS2700 N/A 0.115 in
RL38S3C7 N/A 38 N/A 718 CRES N/A AMS 5662 N/A 230 KSI UTS Min N/A Passivate per AMS2700 N/A 0.115 in
RL38SS7 N/A 38 N/A 4340 Steel N/A AMS-S-5000 N/A 150-165 KSI UTS N/A Cadmium Plate per AMS-QQ-P-416, Type II, Class 3 N/A 0.115 in
RL38SA9 N/A 38 N/A 4130 Steel or 4140 Steel or 8740 Steel N/A AMS 6370 (4130 Steel), AMS 6382 (4140 Steel), AMS 6322 (8740 Steel) N/A 36-45 HRc per AMS 2759 N/A Cadmium Plate per AMS-QQ-P-416, Type II, Class 3 N/A 0.145 in
RL38SM9 N/A 38 N/A 303 Se CRES N/A ASTM A582 or AMS 5640 N/A None N/A Passivate per AMS2700 N/A 0.145 in
RL38SU9 N/A 38 N/A A286 CRES N/A AMS 5731 or AMS 5732 or AMS 5734 or AMS 5737 N/A 32-40 HRc N/A Passivate per AMS2700 N/A 0.145 in
RL38S3C9 N/A 38 N/A 718 CRES N/A AMS 5662 N/A 230 KSI UTS Min N/A Passivate per AMS2700 N/A 0.145 in
RL38SS9 N/A 38 N/A 4340 Steel N/A AMS-S-5000 N/A 150-165 KSI UTS N/A Cadmium Plate per AMS-QQ-P-416, Type II, Class 3 N/A 0.145 in
RL43SA7 N/A 43 N/A 4130 Steel or 4140 Steel or 8740 Steel N/A AMS 6370 (4130 Steel), AMS 6382 (4140 Steel), AMS 6322 (8740 Steel) N/A 36-45 HRc per AMS 2759 N/A Cadmium Plate per AMS-QQ-P-416, Type II, Class 3 N/A 0.115 in
RL43SM7 N/A 43 N/A 303 Se CRES N/A ASTM A582 or AMS 5640 N/A None N/A Passivate per AMS2700 N/A 0.115 in
RL43SU7 N/A 43 N/A A286 CRES N/A AMS 5731 or AMS 5732 or AMS 5734 or AMS 5737 N/A 32-40 HRc N/A Passivate per AMS2700 N/A 0.115 in
RL43S3C7 N/A 43 N/A 718 CRES N/A AMS 5662 N/A 230 KSI UTS Min N/A Passivate per AMS2700 N/A 0.115 in
RL43SS7 N/A 43 N/A 4340 Steel N/A AMS-S-5000 N/A 150-165 KSI UTS N/A Cadmium Plate per AMS-QQ-P-416, Type II, Class 3 N/A 0.115 in
RL43SA9 N/A 43 N/A 4130 Steel or 4140 Steel or 8740 Steel N/A AMS 6370 (4130 Steel), AMS 6382 (4140 Steel), AMS 6322 (8740 Steel) N/A 36-45 HRc per AMS 2759 N/A Cadmium Plate per AMS-QQ-P-416, Type II, Class 3 N/A 0.145 in
RL43SM9 N/A 43 N/A 303 Se CRES N/A ASTM A582 or AMS 5640 N/A None N/A Passivate per AMS2700 N/A 0.145 in
RL43SU9 N/A 43 N/A A286 CRES N/A AMS 5731 or AMS 5732 or AMS 5734 or AMS 5737 N/A 32-40 HRc N/A Passivate per AMS2700 N/A 0.145 in
RL43S3C9 N/A 43 N/A 718 CRES N/A AMS 5662 N/A 230 KSI UTS Min N/A Passivate per AMS2700 N/A 0.145 in
RL43SS9 N/A 43 N/A 4340 Steel N/A AMS-S-5000 N/A 150-165 KSI UTS N/A Cadmium Plate per AMS-QQ-P-416, Type II, Class 3 N/A 0.145 in
RL47SA6 N/A 47 N/A 4130 Steel or 4140 Steel or 8740 Steel N/A AMS 6370 (4130 Steel), AMS 6382 (4140 Steel), AMS 6322 (8740 Steel) N/A 36-45 HRc per AMS 2759 N/A Cadmium Plate per AMS-QQ-P-416, Type II, Class 3 N/A 0.099 in
RL47SM6 N/A 47 N/A 303 Se CRES N/A ASTM A582 or AMS 5640 N/A None N/A Passivate per AMS2700 N/A 0.099 in
RL47SU6 N/A 47 N/A A286 CRES N/A AMS 5731 or AMS 5732 or AMS 5734 or AMS 5737 N/A 32-40 HRc N/A Passivate per AMS2700 N/A 0.099 in
RL47S3C6 N/A 47 N/A 718 CRES N/A AMS 5662 N/A 230 KSI UTS Min N/A Passivate per AMS2700 N/A 0.099 in
RL47SS6 N/A 47 N/A 4340 Steel N/A AMS-S-5000 N/A 150-165 KSI UTS N/A Cadmium Plate per AMS-QQ-P-416, Type II, Class 3 N/A 0.099 in
Unit of Measure
1 2 3 4