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355551S — BOLT,MACHINE

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

355551S: BOLT,MACHINE.

The BOLT,MACHINE is a the manufacturer industrial component. Key specifications include material: STEEL COMP 3135 OVERALL, head_style: HEXAGON, head_height: 0.281 INCHES NOMINAL IN, thread_class: 3A A, thread_length: 0.500 INCHES MINIMUM IN, fastener_length: 1.125 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5306-00-274-0966, 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
355551S
NSN: 5306-00-274-0966
FSC: 5306 — Bolts
CAGE: 57526 — FORD MOTOR COMPANY (USA)
SPECIFICATIONS
materialSTEEL COMP 3135 OVERALL
head_styleHEXAGON
head_height0.281 INCHES NOMINAL IN
thread_class3A A
thread_length0.500 INCHES MINIMUM IN
fastener_length1.125 INCHES NOMINAL IN
hardness_rating34.0 ROCKWELL C MAXIMUM OVERALL
thread_directionRIGHT-HAND
features_providedUNFINISHED HEAD
width_between_flats0.562 INCHES NOMINAL IN
nominal_thread_diameter0.375 INCHES IN
minimum_tensile_strength131000 POUNDS PER SQUARE INCH LBS
NSN5306-00-274-0966
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 355551S · 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
•
HEAD HEIGHT: 0.281 INCHES NOMINAL IN
•
FASTENER LENGTH: 1.125 INCHES NOMINAL IN
•
THREAD LENGTH: 0.500 INCHES MINIMUM IN
•
HARDNESS RATING: 34.0 ROCKWELL C MAXIMUM OVERALL
•
MATERIAL DOCUMENT AND CLASSIFICATION: SAE ASSN STD SINGLE MATERIAL RESPONSE OVERALL
•
NOMINAL THREAD DIAMETER: 0.375 INCHES IN
•
FEATURES PROVIDED: UNFINISHED HEAD
•
HEAD STYLE: HEXAGON
TECHNICAL CHARACTERISTICS
HEAD HEIGHT0.281 INCHES NOMINAL IN
FASTENER LENGTH1.125 INCHES NOMINAL IN
THREAD LENGTH0.500 INCHES MINIMUM IN
HARDNESS RATING34.0 ROCKWELL C MAXIMUM OVERALL
MATERIAL DOCUMENT AND CLASSIFICATIONSAE ASSN STD SINGLE MATERIAL RESPONSE OVERALL
NOMINAL THREAD DIAMETER0.375 INCHES IN
FEATURES PROVIDEDUNFINISHED HEAD
HEAD STYLEHEXAGON
THREAD DIRECTIONRIGHT-HAND
WIDTH BETWEEN FLATS0.562 INCHES NOMINAL IN
SUBSTITUTES & CROSS-REFERENCES 1
A997Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusCancelled· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 355551S?
355551S is a BOLT,MACHINE.
What parts can replace 355551S?
There is 1 known substitute for 355551S: A997. Substitute compatibility should be verified for your specific system.
What is the NSN for 355551S?
355551S is cataloged in the U.S. Government catalog under NSN 5306-00-274-0966. 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.