91253A309 — SCREW,CAP,SOCKET HEAD

✓ Government record, cited

— · BOLT SCREW

PRODUCT OVERVIEW

91253A309: SCREW,CAP,SOCKET HEAD.

The SCREW,CAP,SOCKET HEAD is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, head_style: FLAT COUNTERSUNK, head_height: 0.161 INCHES NOMINAL IN, thread_class: 3A A, head_diameter: 0.531 INCHES NOMINAL IN, thread_length: 1.000 INCHES MINIMUM AND 1.500 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5305-01-535-4138, indicating validated use in U.S. government and defense logistics supply chains. Available through authorized enterprise resellers and TPM (Third Party Maintenance) channels.

Verify compatibility with your specific system configuration before ordering.

WHERE IT FITS

91253A309

NSN: 5305-01-535-4138
FSC: 5305 — Screws
CAGE: 39428 — MCMASTER-CARR SUPPLY CO (USA)

SPECIFICATIONS

material	STEEL OVERALL
head_style	FLAT COUNTERSUNK
head_height	0.161 INCHES NOMINAL IN
thread_class	3A A
head_diameter	0.531 INCHES NOMINAL IN
thread_length	1.000 INCHES MINIMUM AND 1.500 INCHES MAXIMUM IN
fastener_length	1.000 INCHES NOMINAL IN
hardness_rating	39.0 ROCKWELL C MINIMUM AND 44.0 ROCKWELL C MAXIMUM OVERALL
thread_direction	RIGHT-HAND
countersink_angle	82.0 DEGREES NOMINAL
surface_treatment	OXIDE OVERALL
width_across_flats	0.156 INCHES NOMINAL IN
NSN	5305-01-535-4138

COMPONENT DIAGRAM

KEY FEATURES

•

WIDTH ACROSS FLATS: 0.156 INCHES NOMINAL IN

•

HEAD HEIGHT: 0.161 INCHES NOMINAL IN

•

FASTENER LENGTH: 1.000 INCHES NOMINAL IN

•

THREAD LENGTH: 1.000 INCHES MINIMUM AND 1.500 INCHES MAXIMUM IN

•

HARDNESS RATING: 39.0 ROCKWELL C MINIMUM AND 44.0 ROCKWELL C MAXIMUM OVERALL

•

MATERIAL DOCUMENT AND CLASSIFICATION: ASTM F825 ASSN STD ALL MATERIAL RESPONSES OVERALL

•

NOMINAL THREAD DIAMETER: 0.250 INCHES IN

•

HEAD STYLE: FLAT COUNTERSUNK

TECHNICAL CHARACTERISTICS

WIDTH ACROSS FLATS	0.156 INCHES NOMINAL IN
HEAD HEIGHT	0.161 INCHES NOMINAL IN
FASTENER LENGTH	1.000 INCHES NOMINAL IN
THREAD LENGTH	1.000 INCHES MINIMUM AND 1.500 INCHES MAXIMUM IN
HARDNESS RATING	39.0 ROCKWELL C MINIMUM AND 44.0 ROCKWELL C MAXIMUM OVERALL
MATERIAL DOCUMENT AND CLASSIFICATION	ASTM F825 ASSN STD ALL MATERIAL RESPONSES OVERALL
NOMINAL THREAD DIAMETER	0.250 INCHES IN
HEAD STYLE	FLAT COUNTERSUNK
THREAD DIRECTION	RIGHT-HAND
COLOR	BLACK OVERALL

OTHER ITEMS IN FSC 5305 — Screws

Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.

5305-00-001-5016 5305-00-001-9160 5305-00-001-9629 5305-00-001-9742 5305-00-001-9768 5305-00-003-4306 5305-00-003-6694 5305-00-003-6753

SUBSTITUTES & CROSS-REFERENCES 1

17-2-0989Reference document

Same NSN cross-reference

Reference document — Drawing number reference only

LIFECYCLE

NSN statusActive· U.S. Government catalog

Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required

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FREQUENTLY ASKED QUESTIONS

What is 91253A309?

91253A309 is a SCREW,CAP,SOCKET HEAD.

What parts can replace 91253A309?

There is 1 known substitute for 91253A309: 17-2-0989. Substitute compatibility should be verified for your specific system.

What is the NSN for 91253A309?

91253A309 is cataloged in the U.S. Government catalog under NSN 5305-01-535-4138. This indicates validated use in U.S. government and defense supply chains.

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91253A309 — SCREW,CAP,SOCKET HEAD

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