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91478A554 — SCREW,LAG

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

91478A554: SCREW,LAG.

The SCREW,LAG is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, fastener_length: 3.000 INCHES NOMINAL IN, hardness_rating: 70.0 ROCKWELL B NOMINAL OVERALL, surface_treatment: ZINC ALLOY OVERALL, end_item_identification: 5980-01-558-1080;ELECTRO-OPTICS MAINTENANCE SHOP SET, nonmachine_thread_style: WOOD SCREW (TYPE WD). This part is cataloged in the U.S.

Government catalog under NSN 5305-01-581-9300, 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
91478A554
NSN: 5305-01-581-9300
NIINs: 015819300, 015820901
FSC: 5305 — Screws
CAGE: 3A054 — MCMASTER-CARR SUPPLY CO (USA)
SPECIFICATIONS
materialSTEEL OVERALL
fastener_length3.000 INCHES NOMINAL IN
hardness_rating70.0 ROCKWELL B NOMINAL OVERALL
surface_treatmentZINC ALLOY OVERALL
end_item_identification5980-01-558-1080;ELECTRO-OPTICS MAINTENANCE SHOP SET
nonmachine_thread_styleWOOD SCREW (TYPE WD)
nonmachine_nominal_thread_diameter0.250 INCHES IN
NSN5305-01-581-9300
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 91478A554 · 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
•
FASTENER LENGTH: 3.000 INCHES NOMINAL IN
•
HARDNESS RATING: 70.0 ROCKWELL B MINIMUM OVERALL
•
NONMACHINE THREAD STYLE: WOOD SCREW (TYPE WD)
•
SURFACE TREATMENT: ZINC OVERALL
•
MATERIAL: STEEL OVERALL
TECHNICAL CHARACTERISTICS
NONMACHINE NOMINAL THREAD DIAMETER0.250 INCHES IN
FASTENER LENGTH3.000 INCHES NOMINAL IN
HARDNESS RATING70.0 ROCKWELL B MINIMUM OVERALL
NONMACHINE THREAD STYLEWOOD SCREW (TYPE WD)
SURFACE TREATMENTZINC OVERALL
END ITEM IDENTIFICATION5980-01-558-1080; ELECTRO-OPTIC MAINTENANCE SHELTER
MATERIALSTEEL OVERALL
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 91478A554?
91478A554 is a SCREW,LAG.
What is the NSN for 91478A554?
91478A554 is cataloged in the U.S. Government catalog under NSN 5305-01-581-9300. 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.