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Unit of Measure

Series

 N/A SHF( )

Material Specification

 N/A AMS 6415 or AMS 6484

Material

 N/A 4340 Steel, 4140 Steel

Heat Treat

 N/A 160-180 KSI UTS

Finish

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

Lockring Part Number

 N/A RL24SA5

Nut End Type

 N/A Drilled

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

D ±.015

 N/A 0.500 in

E - Dia +.000 -.005

 N/A 0.371 in

F ±.015

 N/A 0.560 in

G ±.005

 N/A 0.221 in

H ±.005

 N/A 0.138 in

J ±.015

 N/A 0.160 in

K Dia

 N/A 0.076 in

L ±.015

 N/A 1.438 in

M

 N/A 0.3125-18UNJC-3B

N -Dia +.003 -.000

 N/A 0.375 in

P - Cbore Depth without O-ring

 N/A 0.148 in

Q - Cbore Depth with O-ring

 N/A 0.195 in

Tap Drill Size

 N/A 0.257 in

O-Ring Size

 N/A AS568-010

Counterbore Tool Part Number

 N/A RC24-257

Basic Tap Size

 N/A 0.3125-18UNC

Drive Wrench Number

 N/A R1105W

Lockring Drive Tool Part Number

 N/A S101D12

Removal Tool Part Number

 N/A BT309

Notes

 N/A
  • <1>The stud end thread has a special pitch dia and minor dia which installs into a MIL-S-8879 class 3B. FED-STD-H28/2 Class 3B, or national Class 3 tapped hole.
  • <3>Maximum 2 incomplete threads
  • Mating Lockring is not included with stud. It must be ordered separtely
  • 4130 Steel and A286 Cres indicate stabdard materials
  • For Titanium with anodic treatment per AMS 2488, Type 2, add suffix EO301 to stud part number.
  • Taps are not supplied by Howmet
  • "B" diameter and Minor diameter of thread to be concentric within .003 film
  • Thread as shown per AS8879 is prefered. Alternate thread per FED-STD-h28/2 Class-3B or national Class 3 is applicable when specified by design activity.
  • Without O-ring: Use to effect fluid seal for pressures up to 150 psi. Install part until top serrated flange is .010 to .020 below surface.
  • Without O-ring: Use for dust and foreign matter exclusion. Install part until flange is seated in counterbore. Don't use excessive wrench torque.
  • O-ring must be specified separately and shall be selected based on system fluid and temperature and are not supplied by Howmet. O-ring sizes per AS 568. With proper installation and proper choice of O-ring, fluid seal up to 150 psi will be effected.
  • Drive lockring from .005 to .010 below material surface.