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Unit of Measure

Insert Type

N/A Standard

Series

N/A RJ100

Material

N/A 4130 Steel

Finish

N/A Cadmium Plate per AMS-QQ-P-416, Type II, Class 3

Material Specification

N/A AMS-S-6758, COND F

Military Part Number

N/A MS51991-108

Lockring Part Number

N/A RLRR38SA9

Lockring Military Part Number

N/A MS51990-108P

Internal Thread Lock

N/A No

A - Internal Thread, Class 3B

N/A 0.3750-16 UNJC

B - External Thread

N/A 0.5625-12

B - External Thread - Pitch Diameter

N/A 0.5091-0.5116 in

B - External Thread - Minor Diameter

N/A 0.4503-0.4635 in

C ± .015

N/A 0.620 in

D ± .015

N/A 0.420 in

Heat Treat

N/A 125 KSI UTS min

E ± .015

N/A 0.200 in

F - Diameter

N/A 0.445 in

G - Diameter

N/A 0.425 in

H - Diameter

N/A 0.387-0.402 in

J - Number of Teeth

N/A 26.000

K +2º -1º

N/A 102.000 º

L - Diameter +.007 -.002

N/A 0.487 in

M - Diameter +.005 -.004

N/A 0.456 in

N ± .015

N/A 0.120 in
Aluminum Step Drill Part Number1 N/A RCDC38-484
Magnesium Step Drill Part Number2 N/A RCDAC38-484

Basic Tap Size

N/A 0.5625-12UNC

Wrench Part Number

N/A R1108W

Locking Drive Tool

N/A R108D
Removal Drill Size3 N/A 29/64

N/A

  • The external thread has a special pitch diameter and minor diameter which installs into a AS8879 class 3B, MIL-S-7742 class 3B, or National class 3 tapped hole.
  • Inserts are installed and removed in accordance with MS51995.
  • Insert lengths shown are based on installation in 2024-T4 Aluminum and in such materials will accommodate tension loads up to the strength of a mating bolt heat treated to 145,000 PSI UTS. If this design criteria is required in parent materials of lower mechanical properties, longer insert lengths should be specified. Mating bolts should have a thread engagement of 1.5 diameters or if insert has a thread lock, the bolt should extend through the insert 2 pitches including chamfer.
  • Mating lockring is not included with insert. It must be ordered separately.

  • 1 Step Drills are designed for thru hole drilling, when used to drill a blind hole, it may be necessary to grind the drill to suit the depth required.
  • 2 Step Drills are designed for thru hole drilling, when used to drill a blind hole, it may be necessary to grind the drill to suit the depth required.
  • 3 Removal Drills are not supplied by Howmet.