Item # RJ104SN6L, RJ100 Inserts - Ring Locked, Coarse Internal and Coarse External Threads On Howmet Aerospace

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Unit of Measure

Insert Type	N/A Standard
Series	N/A RJ100
Material	N/A 4340 Steel (Alternate 4140 Steel)
Finish	N/A Cadmium Plate per AMS-QQ-P-416, Type II, Class 3
Material Specification	N/A AMS-S-5000 or AMS-S-5625
Military Part Number	N/A MS51991-104
Lockring Part Number	N/A RLRR21SA6
Lockring Military Part Number	N/A MS51990-104P
Internal Thread Lock	N/A Yes
A - Internal Thread, Class 3B	N/A 0.1640-32 UNJC
B - External Thread	N/A 0.2500-20
B - External Thread - Pitch Diameter	N/A 0.2178-0.2198 in
B - External Thread - Minor Diameter	N/A 0.1824-0.1909 in
C ± .015	N/A 0.380 in
D ± .015	N/A 0.250 in
Heat Treat	N/A 160-180 KSI UTS
E ± .015	N/A 0.130 in
F - Diameter	N/A 0.197 in
G - Diameter	N/A 0.182-0.187 in
H - Diameter	N/A 0.170-0.175 in
J - Number of Teeth	N/A 13.000
K +2º -1º	N/A 102.000 º
L - Diameter +.007 -.002	N/A 0.230 in
M - Diameter +.005 -.004	N/A 0.203 in
N ± .015	N/A 0.080 in

Aluminum Step Drill Part Number¹	N/A RCDC21-201
Magnesium Step Drill Part Number²	N/A RCDAC21-201
Basic Tap Size	N/A 0.2500-20UNC
Wrench Part Number	N/A R1104W
Locking Drive Tool	N/A R104D
Removal Drill Size³	N/A 19/64

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.

Insert Type