AN315 at a glance

AN315, nut, plain, hexagon, airframe — AN315

AN315 engineering drawing with dimensions — AN315

Current standard: NASM315. AN315 is now controlled by NASM315 (AN315 Rev. 10 Notices 1 and 2). The part numbers do not change: AN315-640 is still the number on drawings, IPCs and bags, and it is the same part. Order it by that number; the current document is NASM315.

Specification

Item	Value
Current standard	NASM315 (part numbers unchanged)
Type	Plain hex nut
Material	Steel, aluminum alloy and corrosion-resistant steel (see procurement specification)
Strength	Minimum ultimate tensile strength per table (steel and aluminum alloy columns)

Item	Value
Locking	None (plain nut)
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). Aluminum alloy: anodize per MIL-A-8625, Type II. CRES: passivate per QQ-P-35
Procurement	FF-N-836
Status	Cancelled and superseded by NASM315 (Notice 1, 30 Sep 1999; repeated by Notice 2, 23 Sep 2002); part numbers unchanged.

Dimensions by size

Dimension, in	No. 6-40 UNF-3B	No. 10-32 UNF-3B	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	1-12 UNF-3B	1-14 NF-3	1-1/8-12 UNF-3B	1-1/4-12 UNF-3B
A — Width across flats	.313	.375	.438	.500	.563	.625	.750	.875	1.000	1.125	1.313	1.500	1.500	1.688	1.875
A_tol — Tolerance on A	+.002 / -.010	+.002 / -.010	+.002 / -.010	+.002 / -.010	+.002 / -.010	+.002 / -.011	+.002 / -.012	+.002 / -.012	+.002 / -.014	+.002 / -.016	+.002 / -.017	+.002 / -.019	+.002 / -.019	+.002 / -.021	+.002 / -.023
B — Width across corners (approx.)	23/64	7/16	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	1-61/64	2-11/64
H — Nut height	7/64	9/64	3/16	15/64	9/32	21/64	3/8	27/64	15/32	—	21/32	3/4	3/4	13/16	7/8

Maximum – minimum as tabulated in AN315 Rev. 10; letters as on the standard's drawing.

Part numbers

Part no.	Size	Steel min. tensile, lb	Al alloy min. tensile, lb
AN315-640	No. 6-40 UNF-3B	-	-
AN315-3	No. 10-32 UNF-3B	2,210	1,100
AN315-4	1/4-28 UNF-3B	4,080	2,030
AN315-5	5/16-24 UNF-3B	6,500	3,220
AN315-6	3/8-24 UNF-3B	10,100	5,020
AN315-7	7/16-20 UNF-3B	13,600	6,750
AN315-8	1/2-20 UNF-3B	18,500	9,180
AN315-9	9/16-18 UNF-3B	23,600	11,700
AN315-10	5/8-18 UNF-3B	30,100	14,900
AN315-12	3/4-16 UNF-3B	44,000	21,800
AN315-14	7/8-14 UNF-3B	60,000	29,800
AN315-15	1-12 UNF-3B	80,700	40,000
AN315-16	1-14 NF-3	80,700	40,000
AN315-18	1-1/8-12 UNF-3B	101,800	50,500
AN315-20	1-1/4-12 UNF-3B	130,200	64,400

Every part number of AN315 Rev. 10, 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	AN315{material}<dash>{hand}
-	Material: Steel, cadmium plated (standard; hyphen kept before the dash number)
D	Material: Aluminum alloy, anodized (D added before the dash number)
C	Material: Corrosion-resistant steel, passivated (C added before the dash number)
(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	AN315-7L — Steel plain hex nut, 7/16-20 UNF-3B, left-hand thread (AN315D7R = aluminum alloy, right-hand; AN315C7R = corrosion-resistant steel, right-hand)

Notes from the standard

Thread T per MIL-S-7742, countersunk 110 degrees to the O.D. of the threads.
Chamfer on bottom face 15 degrees to dimension A is optional.
(a) For aluminum alloy nuts larger than -5 size, tolerances on dimension A may conform to the applicable material specifications for bar and rod.
(b) The 1-14 NF thread size (-16) is inactive for design after 27 Mar 1967.
Unless otherwise specified, tolerances: fractions +/-1/64, decimals +/-.010, angles +/-1 degree.
For design feature purposes this standard takes precedence over the procurement documents referenced herein; referenced documents shall be of the issue in effect on the date of invitation for bid.
The scan prints thousands with a space (for example 2 210); shown here with a comma. Dash -640 (No. 6-40) has no strength values printed.

Sources

AN315 Rev. 10, 29 Dec 1972 — Nut, Plain, Hexagon, Airframe — dimensions, part numbers and notes. Public domain, distribution unlimited. Notices: Notice 1 (30 Sep 1999): AN315 Rev. 10 cancelled and superseded by NASM315; the part identification number of AN315 Rev. 10 and the part number of NASM315 are identical.; Notice 2 (23 Sep 2002): same cancellation and supersession by NASM315, with the cross-reference example corrected to AN315-7L.

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