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S371-7-18 — BOLT,CLOSE TOLERANCE

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

S371-7-18: BOLT,CLOSE TOLERANCE.

The BOLT,CLOSE TOLERANCE is a the manufacturer industrial component. Key specifications include material: STEEL COMP XM-13 OVERALL, head_style: DOUBLE HEXAGON W/HOLE, grip_length: 1.115 INCHES MINIMUM AND 1.135 INCHES MAXIMUM IN, head_height: 0.425 INCHES MINIMUM AND 0.445 INCHES MAXIMUM IN, thread_class: 3A A, grip_diameter: 0.4365 INCHES MINIMUM AND 0.4370 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5306-01-169-6772, 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
S371-7-18
NSN: 5306-01-169-6772
FSC: 5306 — Bolts
CAGE: 17446 — HUCK INTERNATIONAL, INC (USA)
SPECIFICATIONS
materialSTEEL COMP XM-13 OVERALL
head_styleDOUBLE HEXAGON W/HOLE
grip_length1.115 INCHES MINIMUM AND 1.135 INCHES MAXIMUM IN
head_height0.425 INCHES MINIMUM AND 0.445 INCHES MAXIMUM IN
thread_class3A A
grip_diameter0.4365 INCHES MINIMUM AND 0.4370 INCHES MAXIMUM IN
thread_length0.680 INCHES MINIMUM AND 0.730 INCHES MAXIMUM IN
fastener_length1.815 INCHES MINIMUM AND 1.845 INCHES MAXIMUM IN
thread_directionRIGHT-HAND
surface_treatmentPASSIVATE OVERALL
width_between_flats0.502 INCHES NOMINAL IN
nominal_thread_diameter0.437 INCHES IN
NSN5306-01-169-6772
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: S371-7-18 · 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
•
EXTENDED WASHER THICKNESS: 0.089 INCHES MINIMUM AND 0.109 INCHES MAXIMUM IN
•
HEAD HEIGHT: 0.425 INCHES MINIMUM AND 0.445 INCHES MAXIMUM IN
•
FASTENER LENGTH: 1.815 INCHES MINIMUM AND 1.845 INCHES MAXIMUM IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
•
EXTENDED WASHER DIAMETER: 0.740 INCHES MINIMUM AND 0.750 INCHES MAXIMUM IN
•
THREAD LENGTH: 0.680 INCHES MINIMUM AND 0.730 INCHES MAXIMUM IN
•
NOMINAL THREAD DIAMETER: 0.437 INCHES IN
•
HEAD STYLE: DOUBLE HEXAGON W/HOLE
TECHNICAL CHARACTERISTICS
EXTENDED WASHER THICKNESS0.089 INCHES MINIMUM AND 0.109 INCHES MAXIMUM IN
HEAD HEIGHT0.425 INCHES MINIMUM AND 0.445 INCHES MAXIMUM IN
FASTENER LENGTH1.815 INCHES MINIMUM AND 1.845 INCHES MAXIMUM IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
EXTENDED WASHER DIAMETER0.740 INCHES MINIMUM AND 0.750 INCHES MAXIMUM IN
THREAD LENGTH0.680 INCHES MINIMUM AND 0.730 INCHES MAXIMUM IN
NOMINAL THREAD DIAMETER0.437 INCHES IN
HEAD STYLEDOUBLE HEXAGON W/HOLE
THREAD DIRECTIONRIGHT-HAND
GRIP LENGTH1.115 INCHES MINIMUM AND 1.135 INCHES MAXIMUM IN
OTHER ITEMS IN FSC 5306 — Bolts
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5306-00-001-1276 5306-00-001-1949 5306-00-001-1988 5306-00-001-1989 5306-00-001-1990 5306-00-001-1991 5306-00-001-1993 5306-00-001-2017
SUBSTITUTES & CROSS-REFERENCES 5
74328-7-18Reference document
Same NSN cross-reference
Reference document — Secondary reference
10116074Reference document
Same NSN cross-reference
Reference document — Informative reference only
ST3M571-7-18Reference document
Same NSN cross-reference
Reference document — Vendor item drawing reference
BM3326-7-18Reference document
Same NSN cross-reference
Reference document — Secondary reference
VS3060-7-18Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is S371-7-18?
S371-7-18 is a BOLT,CLOSE TOLERANCE.
What parts can replace S371-7-18?
There are 5 known substitutes for S371-7-18: 74328-7-18, 10116074, ST3M571-7-18 and 2 more. Substitute compatibility should be verified for your specific system.
What is the NSN for S371-7-18?
S371-7-18 is cataloged in the U.S. Government catalog under NSN 5306-01-169-6772. 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.