AN316 at a glance

AN316 engineering drawing with dimensions — AN316

Current standard: NASM316. AN316 is now controlled by NASM316 (AN316 Rev. 11 Notice 1). The part numbers do not change: AN316-4 is still the number on drawings, IPCs and bags, and it is the same part. Order it by that number; the current document is NASM316.

Specification

Item	Value
Current standard	NASM316 (part numbers unchanged)
Type	Jam nut
Material	Steel, 300 series corrosion-resistant steel (see procurement specification; 400 series CRES inactive for design after 1 Jan 1992)
Strength	Minimum ultimate tensile strength per table

Item	Value
Locking	None (jam nut, used to lock a plain or castellated nut or a rod end)
Finish	Steel: cadmium plate in accordance with QQ-P-416, Type II, Class 2 (Class 3 plating may be furnished from supplier's stock until 1 Jan 1975). Corrosion-resistant steel: passivate in accordance with QQ-P-35
Procurement	FF-N-836
Status	Cancelled and superseded by NASM316 (Notice 1, 22 Jun 1999); part numbers unchanged.

Dimensions by size

Dimension, in	1/4-28 UNF-3B	5/16-24 UNF-3B	3/8-24 UNF-3B	7/16-20 UNF-3B	1/2-20 UNF-3B	9/16-18 UNF-3B	5/8-18 UNF-3B	3/4-16 UNF-3B	7/8-14 UNF-3B	1-14 NF-3	1-12 UNF-3B
A — Width across flats	.438	.500	.563	.625	.750	.875	1.000	1.125	1.313	1.500	1.500
A_tol — Tolerance on A	+.002 / -.010	+.002 / -.010	+.002 / -.010	+.002 / -.011	+.002 / -.012	+.002 / -.012	+.002 / -.014	+.002 / -.016	+.002 / -.017	+.002 / -.019	+.002 / -.019
B — Width across corners (approx.)	1/2	37/64	21/32	23/32	7/8	1-1/64	1-5/32	1-19/64	1-33/64	1-47/64	1-47/64
H — Nut height	1/8	5/32	3/16	7/32	1/4	9/32	5/16	3/8	7/16	1/2	1/2

Maximum – minimum as tabulated in AN316 Rev. 11; letters as on the standard's drawing.

Part numbers

Part no.	Size	Min. tensile, lb
AN316-4	1/4-28 UNF-3B	2,040
AN316-5	5/16-24 UNF-3B	3,250
AN316-6	3/8-24 UNF-3B	5,050
AN316-7	7/16-20 UNF-3B	6,800
AN316-8	1/2-20 UNF-3B	9,250
AN316-9	9/16-18 UNF-3B	11,800
AN316-10	5/8-18 UNF-3B	15,050
AN316-12	3/4-16 UNF-3B	22,000
AN316-14	7/8-14 UNF-3B	30,000
AN316-16	1-14 NF-3	40,350
AN316-18	1-12 UNF-3B	40,350

Every part number of AN316 Rev. 11, each with its own link. Codes (material, finish) build the full number in the box below.

Part number

What each code means

Part	Meaning
Format	AN316{material}<dash>{hand}
-	Material: Steel, cadmium plated (standard; hyphen kept before the dash number)
C	Material: Corrosion-resistant steel, passivated (C replaces the dash)
(none)	Hand: No hand suffix
R	Hand: Right-hand thread (R after the dash number)
L	Hand: Left-hand thread (L after the dash number)
Example	AN316-7L — Steel jam nut, 7/16-20 UNF-3, left-hand thread (AN316-7R = right-hand; AN316C7L = corrosion-resistant steel, left-hand)

Notes from the standard

Thread T per MIL-S-7742, countersunk 110 degrees to the O.D. of the threads, both sides.
(a) AN316-16 is inactive for design after 30 Oct 1964; use AN316-18 for new design. For sizes smaller than 1/4 use nut AN315.
Unless otherwise specified, tolerances: fractions +/-1/64, angles +/-1 degree. Remove all burrs.
Dimensions in inches. In the event of a conflict between the text of this standard and the references cited herein, the text of this standard takes precedence.

Sources

AN316 Rev. 11, 25 Feb 1991 — Nut, Jam, Hexagon — dimensions, part numbers and notes. Public domain, distribution unlimited. Notices: Notice 1 (22 Jun 1999): AN316 Rev. 11 cancelled and superseded by NASM316; the part identification numbers of AN316 and the part numbers of NASM316 are identical (example AN316-4).

Educational reference only. not approved data. Always consult the applicable SRM, AMM, or AC 43.13-1B and your certifying authority.