91781A078 — SCREW,MACHINE

✓ Government record, cited

— · BOLT SCREW

PRODUCT OVERVIEW

91781A078: SCREW,MACHINE.

The SCREW,MACHINE is a the manufacturer industrial component. Key specifications include head_style: FLAT COUNTERSUNK, thread_class: 2A A, screw_material: STEEL CORROSION RESISTING, fastener_length: 0.312 INCHES NOMINAL IN, thread_direction: RIGHT-HAND, countersink_angle: 82.0 DEGREES NOMINAL. This part is cataloged in the U.S.

Government catalog under NSN 5305-01-307-4389, 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

91781A078

NSN: 5305-01-307-4389
FSC: 5305 — Screws
CAGE: 39428 — MCMASTER-CARR SUPPLY CO (USA)

SPECIFICATIONS

head_style	FLAT COUNTERSUNK
thread_class	2A A
screw_material	STEEL CORROSION RESISTING
fastener_length	0.312 INCHES NOMINAL IN
thread_direction	RIGHT-HAND
countersink_angle	82.0 DEGREES NOMINAL
internal_drive_style	SLOT
nominal_thread_diameter	0.086 INCHES IN
thread_quantity_per_inch	56
thread_series_designator	UNIFIED NATIONAL COARSE (UNC)
nondefinitive_spec/std_data	1 TYPE AND 2S STYLE
NSN	5305-01-307-4389

COMPONENT DIAGRAM

KEY FEATURES

•

FASTENER LENGTH: 0.312 INCHES NOMINAL IN

•

NOMINAL THREAD DIAMETER: 0.086 INCHES IN

•

HEAD STYLE: FLAT COUNTERSUNK

•

THREAD DIRECTION: RIGHT-HAND

•

NONDEFINITIVE SPEC/STD DATA: 1 TYPE AND 2S STYLE

•

SCREW MATERIAL: STEEL CORROSION RESISTING

•

INTERNAL DRIVE STYLE: SLOT

•

COUNTERSINK ANGLE: 82.0 DEGREES NOMINAL

TECHNICAL CHARACTERISTICS

FASTENER LENGTH	0.312 INCHES NOMINAL IN
NOMINAL THREAD DIAMETER	0.086 INCHES IN
HEAD STYLE	FLAT COUNTERSUNK
THREAD DIRECTION	RIGHT-HAND
NONDEFINITIVE SPEC/STD DATA	1 TYPE AND 2S STYLE
SCREW MATERIAL	STEEL CORROSION RESISTING
INTERNAL DRIVE STYLE	SLOT
COUNTERSINK ANGLE	82.0 DEGREES NOMINAL
THREAD CLASS	2A A
THREAD QUANTITY PER INCH	56

OTHER ITEMS IN FSC 5305 — Screws

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

5305-00-000-0094 5305-00-000-1397 5305-00-000-2625 5305-00-000-3669 5305-00-000-3830 5305-00-000-3831

SUBSTITUTES & CROSS-REFERENCES 3

91783A078Reference document

Same NSN cross-reference

Reference document — Secondary reference

FF-S-72Reference document

Same NSN cross-reference

Reference document — Identification reference

91910A078Reference document

Same NSN cross-reference

Reference document — Secondary reference

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 91781A078?

91781A078 is a SCREW,MACHINE.

What parts can replace 91781A078?

There are 3 known substitutes for 91781A078: 91783A078, FF-S-72, 91910A078. Substitute compatibility should be verified for your specific system.

What is the NSN for 91781A078?

91781A078 is cataloged in the U.S. Government catalog under NSN 5305-01-307-4389. This indicates validated use in U.S. government and defense supply chains.

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