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Unit of Measure

Insert Type

 N/A Solid

Series

 N/A R1100

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 Number1 N/A RLRR21SA7
Lockring Military Part Number2 N/A MS51990-105P

Internal Thread Lock

 N/A No

A - Dia ±.005

 N/A 0.248 in

B - External Thread

 N/A 0.3125-18

B - External Thread - Major Diameter

 N/A 0.3043-0.3125 in

B - External Thread - Pitch Diameter

 N/A 0.2769-0.2789 in

B - External Thread - Minor Diameter

 N/A 0.2373-0.2468 in

C ±.015

 N/A 0.440 in

D ±.015

 N/A 0.290 in

K - Dia

 N/A 0.282-0.291 in

L ±.015

 N/A 0.090 in

M - Dia ±.010

 N/A 0.237 in
Aluminum Step Drill Part Number3 N/A RCDC24-257
Magnesium Step Drill Part Number4 N/A RCADC24-257
Basic Tap Size5 N/A 0.3125-18 UNC

Wrench Part Number

 N/A R1105W

Lockring Drive Tool Part Number

 N/A R1105D
Removal Drill Size6 N/A F

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.