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Unit of Measure

Insert Type

 N/A Standard

Series

 N/A RJ200

Material Type

 N/A 4130 Steel

Material Specification

 N/A AMS-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

Military Part Number

 N/A MS51991-204

Lockring Rosan Part Number

 N/A RLRR21SA6

Lockring Military Part Number

 N/A AS51990-104P

Internal Thread Lock

 N/A Yes
A - Internal Thread, Class 3B1 N/A 0.1640-36 UNJF

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 - Overall Length ±.015

 N/A 0.380 in

D - Thread Length ±.015

 N/A 0.250 in

E ±.015

 N/A 0.130 in

F - Dia

 N/A 0.197 in

G - Dia

 N/A 0.182-0.187 in

H - Dia

 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 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, FED-STD-H28/2 Class 3B, or National Class 3 tapped hole.
  • <3> Mating lockring is not included with insert. It must be ordered separately.
  • <4> For standard lenghts as shown in table, "C" overall length and "D" thread length applies. For non-standard lengths, "C" lengths is in 1/16 inch increments and "E" dimension applies in place of "D" dimension.
  • Unless otherwise specified dimensions are in inches & ASME Y14.5M.
  • 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.