close
close
Please click here to view the Installation and Removal

Unit of Measure

Insert Type

N/A Standard

Series

N/A RDJ300

Material Type

N/A A286 CRES

Material Specification

N/A AMS 5731 or AMS 5732 or AMS 5734 or AMS 5737

Heat Treat

N/A 130 KSI UTS min

Finish

N/A Passivate per AMS2700

Lockring Howmet Part Number

N/A RLRR21SB6

Lockring Military Part Number

N/A MS51990-104P

Internal Thread Lock

N/A No
A - Internal Thread, Class 3B1 N/A 0.1640-36 UNJF

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 - Length ±.015

N/A 0.380 in

D ±.015

N/A 0.250 in

E ±.005

N/A 0.047 in

F ±.005

N/A 0.166 in
Aluminum Step Drill Part Number2 N/A RCDC21-213
Magnesium Step Drill Part Number3 N/A RCADC21-213
Basic Tap Size4 N/A 0.2500-28 UNF

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, FED-STD-H28/2 Class 3B, or National Class 3 tapped hole.
  • Unless otherwise specified dimensions are in inches & per ASME Y14.5M.
  • Mating lockring is not included with insert. It must be ordered separately.
  • For 1117 steel case hardened to 50-60 HRC, add suffix EO328 to lockring part number.
  • When parent material surface is not flat or normal to axis of hole, provide a spotface for proper lockring entry.
  • Remove all burrs and sharp edges.

  • 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.