Howmet Fastening Systems
Howmet Fastening Systems
Phone: Sales +1 800 992 4444
Technical Support +1 310 784 6409
Email: HFSTechSupport@howmet.com
Website: www.hfs.howmet.com
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Unit of Measure

Specifications

Series

 N/A SFTJ

Material

 N/A 4130 Steel

Material Specification

 N/A MIL-S-6758

Heat Treat

 N/A 125 KSI UTS min

Finish

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

Military Part Number

 N/A MS51551D105A10

Lockring Part Number

 N/A RLRR24SA7

Lockring Military Part Number

 N/A MS-51990-105P

Nut End Type

 N/A Undrilled

A Nut End Thread Size

 N/A 0.2500-28 UNJF-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 Max

 N/A 0.091 in

D ±.015

 N/A 0.510 in

E ±.015

 N/A 0.690 in

L ±.015

 N/A 0.625 in

L1_CAD

 N/A 0.625 in

Notes

Notes

 N/A
  • 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.
  • Mating lockring is not included with stud. It must be ordered separately.