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91478A544 — SCREW,LAG

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

91478A544: SCREW,LAG.

The SCREW,LAG is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, head_style: HEXAGON, head_height: 0.172 INCHES NOMINAL IN, fastener_length: 1.250 INCHES NOMINAL IN, surface_treatment: ZINC OVERALL, width_between_flats: 0.438 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5305-01-487-8819, 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
91478A544
NSN: 5305-01-487-8819
FSC: 5305 — Screws
CAGE: 39428 — MCMASTER-CARR SUPPLY CO (USA)
SPECIFICATIONS
materialSTEEL OVERALL
head_styleHEXAGON
head_height0.172 INCHES NOMINAL IN
fastener_length1.250 INCHES NOMINAL IN
surface_treatmentZINC OVERALL
width_between_flats0.438 INCHES NOMINAL IN
end_item_identificationFORWARD REPAIR SYSTEM (FRS) NSN 4940-01-463-7940
nonmachine_thread_styleGIMLET POINT (TYPE A, AB OR BA)
nonmachine_nominal_thread_diameter0.250 INCHES IN
part_name_assigned_by_controlling_agencyLAG SCREW
NSN5305-01-487-8819
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 91478A544 · OEM ⚠ VERIFY BEFORE ORDERING Verify thread pitch before ordering — metric (M8×1.25) ≠ imperial (5/16-18). Wrong thread = wrong part. Grade/class stamped on bolt head determines tensile strength ✓ BROKER TIP Grade/class stamped on head determines tensile strength. Grade 8 > Grade 5 > Grade 2. Always confirm head marking matches specification requirement PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
NONMACHINE NOMINAL THREAD DIAMETER: 0.250 INCHES IN
•
HEAD HEIGHT: 0.172 INCHES NOMINAL IN
•
FASTENER LENGTH: 1.250 INCHES NOMINAL IN
•
NONMACHINE THREAD STYLE: GIMLET POINT (TYPE A, AB OR BA)
•
HEAD STYLE: HEXAGON
•
WIDTH BETWEEN FLATS: 0.438 INCHES NOMINAL IN
•
SURFACE TREATMENT: ZINC OVERALL
TECHNICAL CHARACTERISTICS
NONMACHINE NOMINAL THREAD DIAMETER0.250 INCHES IN
HEAD HEIGHT0.172 INCHES NOMINAL IN
FASTENER LENGTH1.250 INCHES NOMINAL IN
NONMACHINE THREAD STYLEGIMLET POINT (TYPE A, AB OR BA)
HEAD STYLEHEXAGON
WIDTH BETWEEN FLATS0.438 INCHES NOMINAL IN
SURFACE TREATMENTZINC OVERALL
PART NAME ASSIGNED BY CONTROLLING AGENCYLAG SCREW
END ITEM IDENTIFICATIONFORWARD REPAIR SYSTEM (FRS) NSN 4940-01-463-7940
MATERIALSTEEL 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

No substitute or cross-reference records for this part.

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 91478A544?
91478A544 is a SCREW,LAG.
What is the NSN for 91478A544?
91478A544 is cataloged in the U.S. Government catalog under NSN 5305-01-487-8819. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.