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K1628 — BOLT,MACHINE

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

K1628: BOLT,MACHINE.

The BOLT,MACHINE is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, head_style: SQUARE, grip_length: 0.750 INCHES NOMINAL IN, head_height: 0.308 INCHES MINIMUM AND 0.348 INCHES MAXIMUM IN, thread_class: 2A A, thread_length: 1.250 INCHES MINIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5306-00-018-6682, 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
K1628
NSN: 5306-00-018-6682
FSC: 5306 — Bolts
CAGE: 30798 — AMCA INTL CORP INSLEY MFG CORP DIV (USA)
SPECIFICATIONS
materialSTEEL OVERALL
head_styleSQUARE
grip_length0.750 INCHES NOMINAL IN
head_height0.308 INCHES MINIMUM AND 0.348 INCHES MAXIMUM IN
thread_class2A A
thread_length1.250 INCHES MINIMUM IN
fastener_length2.000 INCHES NOMINAL IN
hardness_rating95.0 ROCKWELL B MAXIMUM OVERALL
thread_directionRIGHT-HAND
features_providedUNFINISHED HEAD
surface_treatmentCADMIUM OR ZINC OVERALL
width_between_flats0.725 INCHES MINIMUM AND 0.750 INCHES MAXIMUM IN
NSN5306-00-018-6682
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: K1628 · 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: 0.308 INCHES MINIMUM AND 0.348 INCHES MAXIMUM IN
•
FASTENER LENGTH: 2.000 INCHES NOMINAL IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-416,TY 2,CL 3 FED SPEC 1ST TREATMENT RESPONSE OR QQ-Z-325,TY 2,CL 3 FED SPEC 2ND TREATMENT RESPONSE OVERALL
•
THREAD LENGTH: 1.250 INCHES MINIMUM IN
•
HARDNESS RATING: 95.0 ROCKWELL B MAXIMUM OVERALL
•
MATERIAL DOCUMENT AND CLASSIFICATION: FF-B-575,GR 1 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
•
NOMINAL THREAD DIAMETER: 0.500 INCHES IN
•
FEATURES PROVIDED: UNFINISHED HEAD
TECHNICAL CHARACTERISTICS
HEAD HEIGHT0.308 INCHES MINIMUM AND 0.348 INCHES MAXIMUM IN
FASTENER LENGTH2.000 INCHES NOMINAL IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-416,TY 2,CL 3 FED SPEC 1ST TREATMENT RESPONSE OR QQ-Z-325,TY 2,CL 3 FED SPEC 2ND TREATMENT RESPONSE OVERALL
THREAD LENGTH1.250 INCHES MINIMUM IN
HARDNESS RATING95.0 ROCKWELL B MAXIMUM OVERALL
MATERIAL DOCUMENT AND CLASSIFICATIONFF-B-575,GR 1 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
NOMINAL THREAD DIAMETER0.500 INCHES IN
FEATURES PROVIDEDUNFINISHED HEAD
HEAD STYLESQUARE
THREAD DIRECTIONRIGHT-HAND
SUBSTITUTES & CROSS-REFERENCES 4
MS35355-127Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
FF-B-575Reference document
Same NSN cross-reference
Reference document — Replaced / superseded reference
186682Reference document
Same NSN cross-reference
Reference document — Secondary reference
FF-B-575 TY1Reference document
Same NSN cross-reference
Reference document — Replaced / superseded reference
LIFECYCLE
NSN statusCancelled· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is K1628?
K1628 is a BOLT,MACHINE.
What parts can replace K1628?
There are 4 known substitutes for K1628: MS35355-127, FF-B-575, 186682 and 1 more. Substitute compatibility should be verified for your specific system.
What is the NSN for K1628?
K1628 is cataloged in the U.S. Government catalog under NSN 5306-00-018-6682. 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.