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S371-5 — BOLT,CLOSE TOLERANCE

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

S371-5: BOLT,CLOSE TOLERANCE.

The BOLT,CLOSE TOLERANCE is a the manufacturer industrial component. Key specifications include material: STEEL CORROSION RESISTING OVERALL, hole_type: DRILLED, head_style: DOUBLE HEXAGON W/HOLE, grip_length: 1.928 INCHES MINIMUM AND 1.948 INCHES MAXIMUM IN, head_height: 0.338 INCHES MINIMUM AND 0.358 INCHES MAXIMUM IN, thread_class: 3A A. This part is cataloged in the U.S.

Government catalog under NSN 5306-01-107-7239, 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
S371-5
NSN: 5306-01-107-7239
FSC: 5306 — Bolts
CAGE: 97928 — HUCK INTL INC (USA)
SPECIFICATIONS
materialSTEEL CORROSION RESISTING OVERALL
hole_typeDRILLED
head_styleDOUBLE HEXAGON W/HOLE
grip_length1.928 INCHES MINIMUM AND 1.948 INCHES MAXIMUM IN
head_height0.338 INCHES MINIMUM AND 0.358 INCHES MAXIMUM IN
thread_class3A A
grip_diameter0.3115 INCHES MINIMUM AND 0.3120 INCHES MAXIMUM IN
hole_diameter0.050 INCHES MINIMUM AND 0.060 INCHES MAXIMUM IN
hole_quantity4
thread_length0.526 INCHES MINIMUM AND 0.576 INCHES MAXIMUM IN
fastener_length2.474 INCHES MINIMUM AND 2.504 INCHES MAXIMUM IN
thread_directionRIGHT-HAND
NSN5306-01-107-7239
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: S371-5 · 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: 0.072 INCHES MINIMUM AND 0.092 INCHES MAXIMUM IN
•
HEAD HEIGHT: 0.338 INCHES MINIMUM AND 0.358 INCHES MAXIMUM IN
•
FASTENER LENGTH: 2.474 INCHES MINIMUM AND 2.504 INCHES MAXIMUM IN
•
EXTENDED WASHER DIAMETER: 0.521 INCHES MINIMUM AND 0.531 INCHES MAXIMUM IN
•
THREAD LENGTH: 0.526 INCHES MINIMUM AND 0.576 INCHES MAXIMUM IN
•
HOLE CONFIGURATION STYLE: DOUBLE HEXAGON LONGITUDINAL HOLE
•
MATERIAL DOCUMENT AND CLASSIFICATION: 23-112,FSCM 08524,TYPE A MFR REF SINGLE MATERIAL RESPONSE OVERALL
•
NOMINAL THREAD DIAMETER: 0.312 INCHES IN
TECHNICAL CHARACTERISTICS
EXTENDED WASHER THICKNESS0.072 INCHES MINIMUM AND 0.092 INCHES MAXIMUM IN
HEAD HEIGHT0.338 INCHES MINIMUM AND 0.358 INCHES MAXIMUM IN
FASTENER LENGTH2.474 INCHES MINIMUM AND 2.504 INCHES MAXIMUM IN
EXTENDED WASHER DIAMETER0.521 INCHES MINIMUM AND 0.531 INCHES MAXIMUM IN
THREAD LENGTH0.526 INCHES MINIMUM AND 0.576 INCHES MAXIMUM IN
HOLE CONFIGURATION STYLEDOUBLE HEXAGON LONGITUDINAL HOLE
MATERIAL DOCUMENT AND CLASSIFICATION23-112,FSCM 08524,TYPE A MFR REF SINGLE MATERIAL RESPONSE OVERALL
NOMINAL THREAD DIAMETER0.312 INCHES IN
HEAD STYLEDOUBLE HEXAGON W/HOLE
THREAD DIRECTIONRIGHT-HAND
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 4
ST3M571-5H31Reference document
Same NSN cross-reference
Reference document — Secondary reference
VAL23033-5Reference document
Same NSN cross-reference
Reference document — Secondary reference
VS3060-5Reference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
GS1030-5H31Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Semi-active item — no replacement plannedNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is S371-5?
S371-5 is a BOLT,CLOSE TOLERANCE.
What parts can replace S371-5?
There are 4 known substitutes for S371-5: ST3M571-5H31, VAL23033-5, VS3060-5 and 1 more. Substitute compatibility should be verified for your specific system.
What is the NSN for S371-5?
S371-5 is cataloged in the U.S. Government catalog under NSN 5306-01-107-7239. This indicates validated use in U.S. government and defense supply chains.
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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.