NAS1804 at a glance

Specification

Item	Value
Type	Self-locking nut
Material	Alloy steel
Status	Check the current issue of the standard before design use.

Dimension, in	.1900-32	.2500-28	.3125-24	.3750-24	.4375-20	.5000-20
A — Washer diameter	.339	.434	.532	.631	.729	.828
B — Washer diameter, min	.299	.394	.492	.591	.689	.788
C — C, min	.277	.347	.418	.490	.631	.703
H — Height, max	.190	.250	.312	.375	.438	.500
W max — Across flats, max	.251	.313	.376	.439	.564	.627
W min — Across flats, min	.243	.305	.367	.430	.553	.616

Dimensions in inches, as tabulated for the part. Blank cells (—): not stated in the documents we hold; take them from the standard.

Part numbers as listed for the part; the standard governs and may list others.

Part	Meaning
Example	NAS1804-4 — .2500-28 double-hexagon self-locking nut, 180 ksi, 450 °F

Thread note 1 (not reproduced in the listing) applies to the thread column; check the standard.
Dash 6 and 6N are both .3750-24 and have the same listed dimensions.
Part number format as commonly written; check the standard for the exact format.
Approved data governs. Use the nut the SRM, drawing or IPC calls for.

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NAS1804 — Nut, Self-Locking, Extended Washer, Double Hexagon, Alloy Steel, 180 KSI, 450 °F — nominal sizes and part numbers.