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Unit of Measure

Series

N/A SFA( )

Material

N/A 4340 Steel

Material Specification

N/A MIL-S-5000

Heat Treat

N/A 160-180 KSI UTS

Finish

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

AND Standard

N/A 20009

Lockring Part Number

N/A RLRR28SA8

Lockring Military Part Number

N/A MS51990-106P

Nut End Type

N/A Drilled

A Nut End Thread Size

N/A 0.3125-24 UNF-3A

B Stud End Thread Size

N/A 0.3750-16

B Stud End Thread-Pitch Diameter

N/A 0.3358-0.3378 in

B Stud End Thread-Minor Diameter

N/A 0.2906-0.3017 in

C

N/A 0.880-0.910 in

D min full THD

N/A 0.688 in

E ±.015

N/A 0.510 in

F ±.015

N/A 0.690 in

G ±.015

N/A 0.160 in

H - Diameter

N/A 0.076 in

L ±.015

N/A 0.875 in

TYPE_SET

N/A 2

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.