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Unit of Measure

Insert Type

N/A Standard

Series

N/A RDJ200

Material Type

N/A A286 CRES

Material Specification

N/A AMS 5731 or AMS 5734

Heat Treat

N/A 83 HRB Min

Finish

N/A Passivate per AMS2700, Plus Solid Film Lube

Lockring Rosan Part Number

N/A RLRR28SA8

Lockring Military Part Number

N/A MS51990-106P

Internal Thread Lock

N/A Yes
A - Internal Thread, Class 3B1 N/A 0.2500-28 UNJF

B - External Thread

N/A 0.3750-16

B - External Thread - Pitch Diameter

N/A 0.3347-0.3372 in

B - External Thread - Minor Diameter

N/A 0.2906-0.3011 in

C - Dia ±.005

N/A 0.257 in

D ±.005

N/A 0.080 in

E - Length ±.015

N/A 0.500 in

F ±.015

N/A 0.330 in
Aluminum Step Drill Part Number2 N/A RCDC28-312
Magnesium Step Drill Part Number3 N/A RCADC28-312
Basic Tap Size4 N/A 0.3750-16 UNC

Wrench Part Number

N/A R1106W

Lockring Drive Tool Part Number

N/A R206D
Removal Drill Size5 N/A 5/16

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.