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Unit of Measure

Series

 N/A SFR5902( )( )(D)L(R)

Material Specification

 N/A MIL-S-6049

Material

 N/A 8740 Alloy Steel per MIL-S-6049

Heat Treat

 N/A 160 - 180 KSI UTS

Finish

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

Nut End Type

 N/A Drilled

A Nut End Thread Size

 N/A 0.2500-28 UNJF-3A

Stud End type

 N/A Recess

B Stud End Thread Size

 N/A 0.4375-20 UNJF-3B

B Stud End Thread-Pitch Diameter

 N/A 0.4084-0.4067 in

B Stud End Thread-Minor Diameter

 N/A 0.3795-0.3700 in

C ±.010

 N/A 0.558 in

D - Dia

 N/A 0.249-0.246 in

E - Dia +.005 -.004

 N/A 0.316 in

F - Dia +.007 -.002

 N/A 0.345 in

G - Dia +.000 -.015

 N/A 0.370 in

H - Dia Min

 N/A 0.294 in

J

 N/A 20.000

K +2 -1

 N/A 102.000 º

M ref

 N/A 0.311 in

N -Dia

 N/A 0.205 in

T ±.015

 N/A 0.594 in

V

 N/A 0.155 Inch

P - Dia ±.010

 N/A 0.190 in

S ±.015

 N/A 0.160 in

U - Dia +.005 -.002

 N/A 0.067 in

L ±.015

 N/A 2.375 in

Lockring - Carbon Steel

 N/A RLRR1997-104

Lockring - A-286 Cres

 N/A RLRR1997E104

Grip Length

 N/A 1.781 in

Shank Length

 N/A 0.125 in

AA Thread

 N/A 0.4375-20 UNJF-3B

AB Dia +.005 -.000

 N/A 0.453 in

AC +.015 -.000

 N/A 0.151 in

AD Min. Full Thread Depth

 N/A 0.608 in

Step Drill Part Number

 N/A SDC453JF

Drive Wrench Number

 N/A R1106W

Lockring Drive Tool Part Number

 N/A SFR5902-4D

Notes

 N/A
  • <1>The studend thread has a special pitch dia and minor dia which installs into a MIL-S-8879 tapped hole.
  • Surface Roughness: Machined surfaces to be 125microinches in accordance with ANSI B46.1 except serrated collar.
  • <3>Maximum 2 incomplete threads
  • Lockring RLRR1997-() series is 1117 Carbon Steel (ASTM A108), 36-45 HRC, Cad plated per QQ-P-416, TY II, Cl3.
  • Lockring RLRR1997E() series is A-286 Cres (AMS5731 or AMS6734), 269 HB Min, Passivated per QQ-P-35.
  • Fillets: R .030 Maximum
  • Edges: Edges broken .003-.015

    Installation Procedure:
    • Axis of hole to be normal to entry surface or provide spotface whenrequired.
    • Install insert to depth shown.
    • Drive lockring to depth shown.
    • Step drills are designed for thru hole drilling, When used to drill a blind hole, it may be necessary to grind the drill to suit the depth required.
    • These studs are primarily designed for use in soft materials (alum, mag, etc). For use in harder materials, cotact us.