NAS1153 at a glance

Specification

Item	Value
Head	100° flat countersunk, close tolerance, short thread
Drive	offset cruciform recess
Material	Steel, A286 corrosion-resistant steel or titanium alloy (6Al-4V)
Status	Check the current issue before design use.

Sizes commonly stocked. The standard governs and may list other lengths.

Thread not stated9 part numbers

Part	Meaning
Format	NAS1153<material><dash number><finish>
-	Material: Steel
E	Material: A286 corrosion-resistant steel
V	Material: Titanium alloy (6Al-4V)
(none)	Finish: Steel: cadmium plate Type 2 Class 2, QQ-P-416; corrosion-resistant steel: passivated, QQ-P-35; titanium: no plating
P	Finish: Steel: cadmium plate Type 2 Class 2, QQ-P-416
A	Finish: Aluminum coating per NAS4006

The listing gives dash number, grip and length; it does not give the thread size.
Material code after the base number: a dash for steel, E for A286 corrosion-resistant steel, V for titanium alloy (6Al-4V).
Finish code after the dash number. Steel: no letter, cadmium plate Type 2 Class 2 per QQ-P-416; P, cadmium plate Type 2 Class 2 per QQ-P-416; A, aluminum coating per NAS4006. Corrosion-resistant steel: no letter, passivated per QQ-P-35; A, aluminum coating per NAS4006. Titanium alloy: no letter, no plating; A, aluminum coating per NAS4006.
Part number written as the listing writes it; the standard governs the exact format.
Approved data governs. Use the screw the SRM, drawing or IPC calls for.

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NAS1153 — Screw, Machine, 100° Flat Head, Close Tolerance, Short Thread, Offset Cruciform, 160 ksi — nominal sizes and part numbers.