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Unit of Measure

Insert Type

N/A Standard

Series

N/A RDJ100

Material Type

N/A 4130 Steel

Material Specification

N/A AMS-S-6758

Heat Treat

N/A 125 KSI UTS min

Finish

N/A Cadmium Plate per AMS-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 0.2500-20

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 - 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
Aluminum Step Drill Part Number2 N/A RCDC21-201
Magnesium Step Drill Part Number3 N/A RCADC21-201
Basic Tap Size4 N/A 0.2500-20 UNC

Wrench Part Number

N/A R1104W

Lockring Drive Tool Part Number

N/A R104D
Removal Drill Size5 N/A 19/64

N/A

  • The external thread has a special pitch diameter and minor diameter which installs into an AS8879 Class 3B.
  • When parent material surface is not flat or normal to axis of hole, provide a spotface for proper lockring entry.
  • Mating lockring is not included with insert. It must be ordered separately.
  • Remove all burrs and edges.
  • Unless otherwise specified dimensions are in inches & ASME Y14.5M.

  • 1 AS8879 Internal Thread
  • 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 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.
  • 4 Taps are not supplied by Howmet.
  • 5 Removal drills are not supplied by Howmet.