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Unit of Measure

Part Type

 N/A Stud

Series

 N/A SF

Simplified Material

 N/A Steel

Material

 N/A 4130 Steel

Material Specification

 N/A MIL-S-6758

Heat Treat

 N/A 125,000 PSI UTS min

Finish

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

Military Part Number

 N/A MS51989-105-36

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 9

D ±.015

 N/A 0.500 in

E ±.015

 N/A 0.390 in

F ±.015

 N/A 0.560 in

L ±.015

 N/A 2.250 in

L Dash Code No.

 N/A 36.000

Notes

 N/A
  • <4>Dimension "L" will be threaded its full lenght when it is "C" dash length or shorter. For nut end lenngth longer than "C" dash length with dimension "L" threaded its full length use "SFT" prefix (Example: SFT101-9SA10A). For nut end length see part number coding.
  • 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.
  • Stud end thread lengths shown are based on installation in 2024-T4 Aluminum and will accommodate tension loads up to the strength of the nut end. If this design criteria is required in parent materials of lower mechanical properties, longer stud end lengths than shown above in column "F" should be specified.
  • <8>2 max incomplete threads.
  • Mating lockring is not included with stud. It must be ordered separately.