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Unit of Measure

Insert Type

N/A Solid

Series

N/A R1100

Material Type

N/A 4340 Steel (Alternate 4140 Steel)

Material Specification

N/A AMS-S-5000 or AMS-S-5625

Heat Treat

N/A 160-180 KSI UTS

Finish

N/A Cadmium Plate per AMS-QQ-P-416, Type II, Class 3
Lockring Rosan Part Number1 N/A RLRR21SA6
Lockring Military Part Number2 N/A MS51990-104P

Internal Thread Lock

N/A No

A - Dia ±.005

N/A 0.197 in

B - External Thread

N/A 0.2500-20

B - External Thread - Major Diameter

N/A 0.2428-0.2500 in

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 ±.015

N/A 0.380 in

D ±.015

N/A 0.250 in

K - Dia

N/A 0.228-0.237 in

L ±.015

N/A 0.080 in

M - Dia ±.010

N/A 0.185 in
Aluminum Step Drill Part Number3 N/A RCDC21-201
Magnesium Step Drill Part Number4 N/A RCADC21-201
Basic Tap Size5 N/A 0.2500-20 UNC

Wrench Part Number

N/A R1104W

Lockring Drive Tool Part Number

N/A R1104D
Removal Drill Size6 N/A 19/64

N/A

  • The external thread has a special pitch diameter and minor diameter which installs into a AS8879 class 3B, FED-STD-H28/2 class 3B, or National class 3 tapped hole.
  • 4130 Steel, 1117 Steel, 303 CRES, A286 CRES indicate standard materials.
  • 125 Microinch Ra for surface roughness per ANSI/ASME B46.1, except:
    - 250 Microinch Ra for serration
    - 100 Microinch Ra for cut threads
    - 63 Microinch Ra for ground or rolled threads.
  • 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 Mating lockring is not included with insert. It must be ordered separately.
  • 2 Mating lockring is not included with insert. It must be ordered separately.
  • 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 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.
  • 5 Taps and Removal drills are available for order.
  • 6 Taps and Removal drills are available for order.