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KNH, MS51831, NAS1395 Series
Unit of Measure

Insert Type

Heavy Duty

Material

A286 CRES per AMS 5731, AMS 5732, AMS 5734, or AMS 5737, 160 KSI Minimum Tensile Strength

Finish Description

Passivate per AMS 2700

Lube Description

Dry Film Lubricant per AS5272, Type 1

Internal Thread Lock

No

Internal Thread Size

0.2500-20 UNJC-3B

External Thread Size

0.4375-14 UNC-2A

Modified Minor Diameter

0.383/0.375

Shear Engagement Area (in²) Ref.

0.2842

C DIA ±.005

0.257

C'Bore Depth ±.010

0.070

L ±.010

0.375

Tap Drill Diameter

0.401/0.396

C'Sink Diameter
+.010
-.000

0.447

Thread Tap Size

0.4375-14 UNC-2B

Thread Tap Depth Min

0.430

Installation Tool Part Number

THD 420L

Removal Drill Size

0.344

Drill Depth ±.010

0.1875