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Unit of Measure

Series

 N/A SFB( )

Material

 N/A 1117 Steel

Material Specification

 N/A ASTM A108

Heat Treat

 N/A None

Finish

 N/A Cadmium plate per QQ-P-416, Type II, Class 3

AND Standard

 N/A 20000

Lockring Part Number

 N/A RLRR24SA7

Lockring Military Part Number

 N/A MS51990-105P

Nut End Type

 N/A Undrilled

A Nut End Thread Size

 N/A 0.2500-28 UNF-3A

B Stud End Thread Size

 N/A 0.3125-18

B Stud End Thread-Pitch Diameter

 N/A 0.2778-0.2795 in

B Stud End Thread-Minor Diameter

 N/A 0.2373-0.2474 in

C

 N/A 0.875-0.905 in

D min full THD

 N/A 0.688 in

E ±.015

 N/A 0.390 in

F ±.015

 N/A 0.560 in

L ±.015

 N/A 0.875 in

TYPE_SET

 N/A 1

Notes

 N/A
  • <4>Nut end lengths "C" are designed to meet AND standards after stud serrated collar is installed .010-.020 below the surface of the parent material.
  • The stud end thread has a special pitch diameter and minor diameter which installs into a MIL-S-8879 class 3B, FED-STD-H28/2 class 3B, or National class 3 tapped hole.
  • Studs are installed in accordance with MS51995.
  • SFA and SFB studs are only furnished to dimensions shown. Coding of modifications is not permissible.
  • <8>2 max incomplete threads.
  • Mating lockring is not included with stud. It must be ordered separately.