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Unit of Measure

Insert Type

N/A Standard

Series

N/A RDJ900

Material Type

N/A 4130 Steel

Material Specification

N/A MIL-S-6758, COND F

Heat Treat

N/A 125 KSI UTS min

Finish

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

Lockring Rosan Part Number

N/A RLRR21SA6

Lockring Military Part Number

N/A MS51990-104P

Internal Thread Lock

N/A Yes
A - Internal Thread, Class 3B1 N/A 0.1640-32 UNJC

B - External Thread

N/A 0.2500-28

B - External Thread - Pitch Diameter

N/A 0.2271-0.2286 in

B - External Thread - Minor Diameter

N/A 0.2014-0.2080 in

C - Dia ±.005

N/A 0.166 in

D ±.005

N/A 0.047 in

E - Length ±.015

N/A 0.380 in

F ±.015

N/A 0.250 in

N/A

  • The external thread has a special pitch diameter and minor diameter which installs into a MIL-S-8879 Class 3B, MIL-S-7742 Class 3B, or National Class 3 tapped hole.
  • 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 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 MIL-S-8879 Internal Thread