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Technical Data Sheet
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93548A638 — Technical Data Sheet

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— · BOLT SCREW
WHAT YOU NEED TO KNOW
Grade/class stamped on head determines strength Metric and imperial threads look similar — measure pitch
Verify thread pitch — metric != imperial
PRODUCT OVERVIEW

The BOLT,SQUARE NECK is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, thread_class: 3A A, thread_length: 3.375 INCHES MINIMUM AND 3.500 INCHES MAXIMUM IN, fastener_length: 3.500 INCHES NOMINAL IN, thread_direction: RIGHT-HAND, surface_treatment: ZINC AND CHROMATE OVERALL. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System under NSN 5306-01-282-3381, 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
93548A638
NSN: 5306-01-282-3381
FSC: 5306
CAGE: 39428 — MCMASTER-CARR SUPPLY CO (USA)
SPECIFICATIONS
materialSTEEL OVERALL
thread_class3A A
thread_length3.375 INCHES MINIMUM AND 3.500 INCHES MAXIMUM IN
fastener_length3.500 INCHES NOMINAL IN
thread_directionRIGHT-HAND
surface_treatmentZINC AND CHROMATE OVERALL
nominal_thread_diameter0.375 INCHES IN
thread_quantity_per_inch16
thread_series_designatorUNIFIED NATIONAL COARSE (UNC)
material_document_and_classificationSAE GR 2 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
NSN5306-01-282-3381
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 93548A638 · 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
•
MATERIAL DOCUMENT AND CLASSIFICATION: SAE GR 2 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
•
THREAD DIRECTION: RIGHT-HAND
•
THREAD CLASS: 3A A
•
THREAD SERIES DESIGNATOR: UNIFIED NATIONAL COARSE (UNC)
•
MATERIAL: STEEL OVERALL
•
THREAD LENGTH: 3.375 INCHES MINIMUM AND 3.500 INCHES MAXIMUM IN
•
SURFACE TREATMENT: ZINC AND CHROMATE OVERALL
•
THREAD QUANTITY PER INCH: 16
TECHNICAL CHARACTERISTICS
MATERIAL DOCUMENT AND CLASSIFICATIONSAE GR 2 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
THREAD DIRECTIONRIGHT-HAND
THREAD CLASS3A A
THREAD SERIES DESIGNATORUNIFIED NATIONAL COARSE (UNC)
MATERIALSTEEL OVERALL
THREAD LENGTH3.375 INCHES MINIMUM AND 3.500 INCHES MAXIMUM IN
SURFACE TREATMENTZINC AND CHROMATE OVERALL
THREAD QUANTITY PER INCH16
FASTENER LENGTH3.500 INCHES NOMINAL IN
NOMINAL THREAD DIAMETER0.375 INCHES IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 3
01103InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
HS3816-56-CA-1XInterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
120266InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVEGOVERNMENT REGISTRY
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 93548A638?
93548A638 is a BOLT,SQUARE NECK.
What parts can replace 93548A638?
There are 3 known substitutes for 93548A638: 01103, HS3816-56-CA-1X, 120266. Substitute compatibility should be verified for your specific system.
What is the NSN for 93548A638?
93548A638 is cataloged in the Federal Logistics Information System under NSN 5306-01-282-3381. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: October 2026