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AS374-4-18 — BOLT,CLOSE TOLERANCE

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

AS374-4-18: BOLT,CLOSE TOLERANCE.

The BOLT,CLOSE TOLERANCE is a the manufacturer industrial component. Key specifications include material: NICKEL ALLOY 718 FASTENER, head_style: HEXAGON, grip_length: 1.125 INCHES MINIMUM AND 1.135 INCHES MAXIMUM IN, head_height: 0.126 INCHES MINIMUM AND 0.141 INCHES MAXIMUM IN, thread_class: 3A A, grip_diameter: 0.2487 INCHES MINIMUM AND 0.2492 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5306-01-348-0794, 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
AS374-4-18
NSN: 5306-01-348-0794
FSC: 5306 — Bolts
CAGE: 84256 — AVIBANK MFG., INC. DBA AVIBANK MANUFACTURING INC (USA)
SPECIFICATIONS
materialNICKEL ALLOY 718 FASTENER
head_styleHEXAGON
grip_length1.125 INCHES MINIMUM AND 1.135 INCHES MAXIMUM IN
head_height0.126 INCHES MINIMUM AND 0.141 INCHES MAXIMUM IN
thread_class3A A
grip_diameter0.2487 INCHES MINIMUM AND 0.2492 INCHES MAXIMUM IN
thread_length0.370 INCHES MAXIMUM IN
fastener_length1.615 INCHES MINIMUM AND 1.635 INCHES MAXIMUM IN
special_featuresBALL, CRES QQ-S-763, TYPE 440C; PLUNGER AND PAWL, STEEL AMS 5629GER AND PAWL,
thread_directionRIGHT-HAND
surface_treatmentPASSIVATE OVERALL
width_between_flats0.430 INCHES MINIMUM AND 0.439 INCHES MAXIMUM IN
NSN5306-01-348-0794
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: AS374-4-18 · 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
•
HEAD HEIGHT: 0.126 INCHES MINIMUM AND 0.141 INCHES MAXIMUM IN
•
FASTENER LENGTH: 1.615 INCHES MINIMUM AND 1.635 INCHES MAXIMUM IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
•
THREAD LENGTH: 0.370 INCHES MAXIMUM IN
•
SHANK UNTHREADED HOLE DIAMETER: 0.076 INCHES MINIMUM AND 0.086 INCHES MAXIMUM FIRST HOLE IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: AMS 5662 ASSN STD SINGLE MATERIAL RESPONSE FASTENER
•
NOMINAL THREAD DIAMETER: 0.250 INCHES IN
•
HEAD STYLE: HEXAGON
TECHNICAL CHARACTERISTICS
HEAD HEIGHT0.126 INCHES MINIMUM AND 0.141 INCHES MAXIMUM IN
FASTENER LENGTH1.615 INCHES MINIMUM AND 1.635 INCHES MAXIMUM IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
THREAD LENGTH0.370 INCHES MAXIMUM IN
SHANK UNTHREADED HOLE DIAMETER0.076 INCHES MINIMUM AND 0.086 INCHES MAXIMUM FIRST HOLE IN
MATERIAL DOCUMENT AND CLASSIFICATIONAMS 5662 ASSN STD SINGLE MATERIAL RESPONSE FASTENER
NOMINAL THREAD DIAMETER0.250 INCHES IN
HEAD STYLEHEXAGON
THREAD DIRECTIONRIGHT-HAND
GRIP LENGTH1.125 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 6
SLB131-4-18Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
AS 374-4-20Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
03A094-4-20Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
03A094-4-18Reference document
Same NSN cross-reference
Reference document — Secondary reference
LB57-4-18Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
SLB131-4-20Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is AS374-4-18?
AS374-4-18 is a BOLT,CLOSE TOLERANCE.
What parts can replace AS374-4-18?
There are 6 known substitutes for AS374-4-18: SLB131-4-18, AS 374-4-20, 03A094-4-20 and 3 more. Substitute compatibility should be verified for your specific system.
What is the NSN for AS374-4-18?
AS374-4-18 is cataloged in the U.S. Government catalog under NSN 5306-01-348-0794. 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.