Howmet Fastening Systems
Howmet Fastening Systems
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RLR Type lockrings have been inactive for new design since 1969 and are superseded by the improved "RLRR" type lockrings.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).

RLR Series Lock Rings
Unit of Measure
1 2 

Item #

Basic Lockring Size

Material Type

Material Specification

Heat Treat

Finish

C - Thickness

RLR16SA5 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
RLR18SA6 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
RLR21SA6 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
RLR23SA7 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
RLR24SA7 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
RLR27SA8 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
RLR28SA8 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
RLR31SA9 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
RLR33SA9 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
RLR38SA9 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
RLR43SA9 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
RLR47SA10 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 0.161 in
RLR56SA11 N/A 56 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 0.176 in
RLR64SA11 N/A 64 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 0.176 in
RLR72SA11 N/A 72 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 0.176 in
RLR82SA12 N/A 82 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 0.193 in
RLR90SA12 N/A 90 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 0.193 in
RLR100SA12 N/A 100 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 0.193 in
RLR124SA12 N/A 124 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 0.193 in
RLR160SA12 N/A 160 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 0.193 in
RLR16SG5 N/A 16 N/A 416 CRES N/A ASTM A581 or ASTM A582 N/A None N/A Passivate N/A 0.084 in
RLR18SG6 N/A 18 N/A 416 CRES N/A ASTM A581 or ASTM A582 N/A None N/A Passivate N/A 0.099 in
RLR21SG6 N/A 21 N/A 416 CRES N/A ASTM A581 or ASTM A582 N/A None N/A Passivate N/A 0.099 in
RLR23SG7 N/A 23 N/A 416 CRES N/A ASTM A581 or ASTM A582 N/A None N/A Passivate N/A 0.123 in
RLR24SG7 N/A 24 N/A 416 CRES N/A ASTM A581 or ASTM A582 N/A None N/A Passivate N/A 0.112 in
RLR27SG8 N/A 27 N/A 416 CRES N/A ASTM A581 or ASTM A582 N/A None N/A Passivate N/A 0.138 in
RLR28SG8 N/A 28 N/A 416 CRES N/A ASTM A581 or ASTM A582 N/A None N/A Passivate N/A 0.138 in
RLR31SG9 N/A 31 N/A 416 CRES N/A ASTM A581 or ASTM A582 N/A None N/A Passivate N/A 0.145 in
RLR33SG9 N/A 33 N/A 416 CRES N/A ASTM A581 or ASTM A582 N/A None N/A Passivate N/A 0.145 in
RLR38SG9 N/A 38 N/A 416 CRES N/A ASTM A581 or ASTM A582 N/A None N/A Passivate N/A 0.145 in
RLR43SG9 N/A 43 N/A 416 CRES N/A ASTM A581 or ASTM A582 N/A None N/A Passivate N/A 0.145 in
RLR47SG10 N/A 47 N/A 416 CRES N/A ASTM A581 or ASTM A582 N/A None N/A Passivate N/A 0.161 in
RLR56SG11 N/A 56 N/A 416 CRES N/A ASTM A581 or ASTM A582 N/A None N/A Passivate N/A 0.176 in
RLR64SG11 N/A 64 N/A 416 CRES N/A ASTM A581 or ASTM A582 N/A None N/A Passivate N/A 0.176 in
RLR72SG11 N/A 72 N/A 416 CRES N/A ASTM A581 or ASTM A582 N/A None N/A Passivate N/A 0.176 in
RLR82SG12 N/A 82 N/A 416 CRES N/A ASTM A581 or ASTM A582 N/A None N/A Passivate N/A 0.193 in
RLR90SG12 N/A 90 N/A 416 CRES N/A ASTM A581 or ASTM A582 N/A None N/A Passivate N/A 0.193 in
RLR100SG12 N/A 100 N/A 416 CRES N/A ASTM A581 or ASTM A582 N/A None N/A Passivate N/A 0.193 in
RLR124SG12 N/A 124 N/A 416 CRES N/A ASTM A581 or ASTM A582 N/A None N/A Passivate N/A 0.193 in
RLR160SG12 N/A 160 N/A 416 CRES N/A ASTM A581 or ASTM A582 N/A None N/A Passivate N/A 0.193 in
RLR18SM6 N/A 18 N/A 303 CRES N/A ASTM A581, ASTM A582 or AMS 5640 N/A None N/A Passivate per AMS2700 N/A 0.099 in
RLR21SM6 N/A 21 N/A 303 CRES N/A ASTM A581, ASTM A582 or AMS 5640 N/A None N/A Passivate per AMS2700 N/A 0.099 in
RLR23SM7 N/A 23 N/A 303 CRES N/A ASTM A581, ASTM A582 or AMS 5640 N/A None N/A Passivate per AMS2700 N/A 0.123 in
RLR27SM8 N/A 27 N/A 303 CRES N/A ASTM A581, ASTM A582 or AMS 5640 N/A None N/A Passivate per AMS2700 N/A 0.138 in
RLR31SM9 N/A 31 N/A 303 CRES N/A ASTM A581, ASTM A582 or AMS 5640 N/A None N/A Passivate per AMS2700 N/A 0.145 in
RLR33SM9 N/A 33 N/A 303 CRES N/A ASTM A581, ASTM A582 or AMS 5640 N/A None N/A Passivate per AMS2700 N/A 0.145 in
RLR43SM9 N/A 43 N/A 303 CRES N/A ASTM A581, ASTM A582 or AMS 5640 N/A None N/A Passivate per AMS2700 N/A 0.145 in
RLR47SM10 N/A 47 N/A 303 CRES N/A ASTM A581, ASTM A582 or AMS 5640 N/A None N/A Passivate per AMS2700 N/A 0.161 in
RLR56SM11 N/A 56 N/A 303 CRES N/A ASTM A581, ASTM A582 or AMS 5640 N/A None N/A Passivate per AMS2700 N/A 0.176 in
RLR64SM11 N/A 64 N/A 303 CRES N/A ASTM A581, ASTM A582 or AMS 5640 N/A None N/A Passivate per AMS2700 N/A 0.176 in
RLR72SM11 N/A 72 N/A 303 CRES N/A ASTM A581, ASTM A582 or AMS 5640 N/A None N/A Passivate per AMS2700 N/A 0.176 in
RLR82SM12 N/A 82 N/A 303 CRES N/A ASTM A581, ASTM A582 or AMS 5640 N/A None N/A Passivate per AMS2700 N/A 0.193 in
RLR90SM12 N/A 90 N/A 303 CRES N/A ASTM A581, ASTM A582 or AMS 5640 N/A None N/A Passivate per AMS2700 N/A 0.193 in
RLR100SM12 N/A 100 N/A 303 CRES N/A ASTM A581, ASTM A582 or AMS 5640 N/A None N/A Passivate per AMS2700 N/A 0.193 in
RLR124SM12 N/A 124 N/A 303 CRES N/A ASTM A581, ASTM A582 or AMS 5640 N/A None N/A Passivate per AMS2700 N/A 0.193 in
RLR160SM12 N/A 160 N/A 303 CRES N/A ASTM A581, ASTM A582 or AMS 5640 N/A None N/A Passivate per AMS2700 N/A 0.193 in
RLR16SN5 N/A 16 N/A 4130 Steel or 4140 Steel N/A AMS-S-5000, AMS 6382, AMS 6349 or AMS 5626 N/A 160-180 KSI UTS N/A Cadmium Plate per AMS-QQ-P-416, Type II, Class 3 N/A 0.084 in
RLR18SN6 N/A 18 N/A 4130 Steel or 4140 Steel N/A AMS-S-5000, AMS 6382, AMS 6349 or AMS 5626 N/A 160-180 KSI UTS N/A Cadmium Plate per AMS-QQ-P-416, Type II, Class 3 N/A 0.099 in
RLR21SN6 N/A 21 N/A 4130 Steel or 4140 Steel N/A AMS-S-5000, AMS 6382, AMS 6349 or AMS 5626 N/A 160-180 KSI UTS N/A Cadmium Plate per AMS-QQ-P-416, Type II, Class 3 N/A 0.099 in
RLR23SN7 N/A 23 N/A 4130 Steel or 4140 Steel N/A AMS-S-5000, AMS 6382, AMS 6349 or AMS 5626 N/A 160-180 KSI UTS N/A Cadmium Plate per AMS-QQ-P-416, Type II, Class 3 N/A 0.123 in
RLR24SN7 N/A 24 N/A 4130 Steel or 4140 Steel N/A AMS-S-5000, AMS 6382, AMS 6349 or AMS 5626 N/A 160-180 KSI UTS N/A Cadmium Plate per AMS-QQ-P-416, Type II, Class 3 N/A 0.112 in
RLR27SN8 N/A 27 N/A 4130 Steel or 4140 Steel N/A AMS-S-5000, AMS 6382, AMS 6349 or AMS 5626 N/A 160-180 KSI UTS N/A Cadmium Plate per AMS-QQ-P-416, Type II, Class 3 N/A 0.138 in
RLR28SN8 N/A 28 N/A 4130 Steel or 4140 Steel N/A AMS-S-5000, AMS 6382, AMS 6349 or AMS 5626 N/A 160-180 KSI UTS N/A Cadmium Plate per AMS-QQ-P-416, Type II, Class 3 N/A 0.138 in
RLR31SN9 N/A 31 N/A 4130 Steel or 4140 Steel N/A AMS-S-5000, AMS 6382, AMS 6349 or AMS 5626 N/A 160-180 KSI UTS N/A Cadmium Plate per AMS-QQ-P-416, Type II, Class 3 N/A 0.145 in
RLR38SN9 N/A 38 N/A 4130 Steel or 4140 Steel N/A AMS-S-5000, AMS 6382, AMS 6349 or AMS 5626 N/A 160-180 KSI UTS N/A Cadmium Plate per AMS-QQ-P-416, Type II, Class 3 N/A 0.145 in
RLR43SN9 N/A 43 N/A 4130 Steel or 4140 Steel N/A AMS-S-5000, AMS 6382, AMS 6349 or AMS 5626 N/A 160-180 KSI UTS N/A Cadmium Plate per AMS-QQ-P-416, Type II, Class 3 N/A 0.145 in
RLR47SN10 N/A 47 N/A 4130 Steel or 4140 Steel N/A AMS-S-5000, AMS 6382, AMS 6349 or AMS 5626 N/A 160-180 KSI UTS N/A Cadmium Plate per AMS-QQ-P-416, Type II, Class 3 N/A 0.161 in
RLR56SN11 N/A 56 N/A 4130 Steel or 4140 Steel N/A AMS-S-5000, AMS 6382, AMS 6349 or AMS 5626 N/A 160-180 KSI UTS N/A Cadmium Plate per AMS-QQ-P-416, Type II, Class 3 N/A 0.176 in
RLR64SN11 N/A 64 N/A 4130 Steel or 4140 Steel N/A AMS-S-5000, AMS 6382, AMS 6349 or AMS 5626 N/A 160-180 KSI UTS N/A Cadmium Plate per AMS-QQ-P-416, Type II, Class 3 N/A 0.176 in
RLR72SN11 N/A 72 N/A 4130 Steel or 4140 Steel N/A AMS-S-5000, AMS 6382, AMS 6349 or AMS 5626 N/A 160-180 KSI UTS N/A Cadmium Plate per AMS-QQ-P-416, Type II, Class 3 N/A 0.176 in
RLR82SN12 N/A 82 N/A 4130 Steel or 4140 Steel N/A AMS-S-5000, AMS 6382, AMS 6349 or AMS 5626 N/A 160-180 KSI UTS N/A Cadmium Plate per AMS-QQ-P-416, Type II, Class 3 N/A 0.193 in
RLR90SN12 N/A 90 N/A 4130 Steel or 4140 Steel N/A AMS-S-5000, AMS 6382, AMS 6349 or AMS 5626 N/A 160-180 KSI UTS N/A Cadmium Plate per AMS-QQ-P-416, Type II, Class 3 N/A 0.193 in
RLR100SN12 N/A 100 N/A 4130 Steel or 4140 Steel N/A AMS-S-5000, AMS 6382, AMS 6349 or AMS 5626 N/A 160-180 KSI UTS N/A Cadmium Plate per AMS-QQ-P-416, Type II, Class 3 N/A 0.193 in
RLR124SN12 N/A 124 N/A 4130 Steel or 4140 Steel N/A AMS-S-5000, AMS 6382, AMS 6349 or AMS 5626 N/A 160-180 KSI UTS N/A Cadmium Plate per AMS-QQ-P-416, Type II, Class 3 N/A 0.193 in
RLR160SN12 N/A 160 N/A 4130 Steel or 4140 Steel N/A AMS-S-5000, AMS 6382, AMS 6349 or AMS 5626 N/A 160-180 KSI UTS N/A Cadmium Plate per AMS-QQ-P-416, Type II, Class 3 N/A 0.193 in
RLR16SU5 N/A 16 N/A A286 CRES N/A AMS 5731 or AMS 5732 or AMS 5734 or AMS 5737 N/A 269 HB Min N/A Passivate per AMS2700 N/A 0.084 in
RLR18SU6 N/A 18 N/A A286 CRES N/A AMS 5731 or AMS 5732 or AMS 5734 or AMS 5737 N/A 269 HB Min N/A Passivate per AMS2700 N/A 0.099 in
RLR21SU6 N/A 21 N/A A286 CRES N/A AMS 5731 or AMS 5732 or AMS 5734 or AMS 5737 N/A 269 HB Min N/A Passivate per AMS2700 N/A 0.099 in
RLR23SU7 N/A 23 N/A A286 CRES N/A AMS 5731 or AMS 5732 or AMS 5734 or AMS 5737 N/A 269 HB Min N/A Passivate per AMS2700 N/A 0.123 in
RLR27SU8 N/A 27 N/A A286 CRES N/A AMS 5731 or AMS 5732 or AMS 5734 or AMS 5737 N/A 269 HB Min N/A Passivate per AMS2700 N/A 0.138 in
RLR28SU8 N/A 28 N/A A286 CRES N/A AMS 5731 or AMS 5732 or AMS 5734 or AMS 5737 N/A 269 HB Min N/A Passivate per AMS2700 N/A 0.138 in
RLR31SU9 N/A 31 N/A A286 CRES N/A AMS 5731 or AMS 5732 or AMS 5734 or AMS 5737 N/A 269 HB Min N/A Passivate per AMS2700 N/A 0.145 in
RLR33SU9 N/A 33 N/A A286 CRES N/A AMS 5731 or AMS 5732 or AMS 5734 or AMS 5737 N/A 269 HB Min N/A Passivate per AMS2700 N/A 0.145 in
RLR38SU9 N/A 38 N/A A286 CRES N/A AMS 5731 or AMS 5732 or AMS 5734 or AMS 5737 N/A 269 HB Min N/A Passivate per AMS2700 N/A 0.145 in
RLR43SU9 N/A 43 N/A A286 CRES N/A AMS 5731 or AMS 5732 or AMS 5734 or AMS 5737 N/A 269 HB Min N/A Passivate per AMS2700 N/A 0.145 in
RLR47SU10 N/A 47 N/A A286 CRES N/A AMS 5731 or AMS 5732 or AMS 5734 or AMS 5737 N/A 269 HB Min N/A Passivate per AMS2700 N/A 0.161 in
RLR56SU11 N/A 56 N/A A286 CRES N/A AMS 5731 or AMS 5732 or AMS 5734 or AMS 5737 N/A 269 HB Min N/A Passivate per AMS2700 N/A 0.176 in
RLR64SU11 N/A 64 N/A A286 CRES N/A AMS 5731 or AMS 5732 or AMS 5734 or AMS 5737 N/A 269 HB Min N/A Passivate per AMS2700 N/A 0.176 in
RLR72SU11 N/A 72 N/A A286 CRES N/A AMS 5731 or AMS 5732 or AMS 5734 or AMS 5737 N/A 269 HB Min N/A Passivate per AMS2700 N/A 0.176 in
RLR82SU12 N/A 82 N/A A286 CRES N/A AMS 5731 or AMS 5732 or AMS 5734 or AMS 5737 N/A 269 HB Min N/A Passivate per AMS2700 N/A 0.193 in
RLR90SU12 N/A 90 N/A A286 CRES N/A AMS 5731 or AMS 5732 or AMS 5734 or AMS 5737 N/A 269 HB Min N/A Passivate per AMS2700 N/A 0.193 in
RLR100SU12 N/A 100 N/A A286 CRES N/A AMS 5731 or AMS 5732 or AMS 5734 or AMS 5737 N/A 269 HB Min N/A Passivate per AMS2700 N/A 0.193 in
RLR124SU12 N/A 124 N/A A286 CRES N/A AMS 5731 or AMS 5732 or AMS 5734 or AMS 5737 N/A 269 HB Min N/A Passivate per AMS2700 N/A 0.193 in
RLR160SU12 N/A 160 N/A A286 CRES N/A AMS 5731 or AMS 5732 or AMS 5734 or AMS 5737 N/A 269 HB Min N/A Passivate per AMS2700 N/A 0.193 in
RLR16S3C5 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
RLR18S3C6 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
RLR21S3C6 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
RLR23S3C7 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
RLR24S3C7 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
RLR27S3C8 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
Unit of Measure
1 2