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A311790 — SCREW,CAP,HEXAGON HEAD

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

A311790: SCREW,CAP,HEXAGON HEAD.

The SCREW,CAP,HEXAGON HEAD is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, head_style: HEXAGON, head_height: 0.150 INCHES MINIMUM AND 0.163 INCHES MAXIMUM IN, thread_class: 2A A, thread_length: 0.750 INCHES MINIMUM IN, fastener_length: 1.250 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5305-00-012-3737, 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
A311790
NSN: 5305-00-012-3737
FSC: 5305 — Screws
CAGE: 00000
SPECIFICATIONS
materialSTEEL OVERALL
head_styleHEXAGON
head_height0.150 INCHES MINIMUM AND 0.163 INCHES MAXIMUM IN
thread_class2A A
thread_length0.750 INCHES MINIMUM IN
fastener_length1.250 INCHES NOMINAL IN
hardness_rating100.0 ROCKWELL B MAXIMUM OVERALL
thread_directionRIGHT-HAND
surface_treatmentCADMIUM AND CHROMATE OR ZINC AND CHROMATE OVERALL
width_between_flats0.428 INCHES MINIMUM AND 0.438 INCHES MAXIMUM IN
nominal_thread_diameter0.250 INCHES IN
minimum_tensile_strength69000 POUNDS PER SQUARE INCH LBS
NSN5305-00-012-3737
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: A311790 · 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: 0.150 INCHES MINIMUM AND 0.163 INCHES MAXIMUM IN
•
FASTENER LENGTH: 1.250 INCHES NOMINAL IN
•
THREAD LENGTH: 0.750 INCHES MINIMUM IN
•
HARDNESS RATING: 100.0 ROCKWELL B MAXIMUM OVERALL
•
NOMINAL THREAD DIAMETER: 0.250 INCHES IN
•
HEAD STYLE: HEXAGON
•
THREAD DIRECTION: RIGHT-HAND
•
WIDTH BETWEEN FLATS: 0.428 INCHES MINIMUM AND 0.438 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS
HEAD HEIGHT0.150 INCHES MINIMUM AND 0.163 INCHES MAXIMUM IN
FASTENER LENGTH1.250 INCHES NOMINAL IN
THREAD LENGTH0.750 INCHES MINIMUM IN
HARDNESS RATING100.0 ROCKWELL B MAXIMUM OVERALL
NOMINAL THREAD DIAMETER0.250 INCHES IN
HEAD STYLEHEXAGON
THREAD DIRECTIONRIGHT-HAND
WIDTH BETWEEN FLATS0.428 INCHES MINIMUM AND 0.438 INCHES MAXIMUM IN
NONDEFINITIVE SPEC/STD DATA2 TYPE AND 10P STYLE AND 2 GRADE
SURFACE TREATMENTCADMIUM AND CHROMATE OR ZINC AND CHROMATE OVERALL
SUBSTITUTES & CROSS-REFERENCES 5
123737Reference document
Same NSN cross-reference
Reference document — Secondary reference
MS35292-10Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
FFS85TYPEIISTYLEReference document
Same NSN cross-reference
Reference document — Identification reference
215327Reference document
Same NSN cross-reference
Reference document — Secondary reference
BCVX2BN2Reference 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 A311790?
A311790 is a SCREW,CAP,HEXAGON HEAD.
What parts can replace A311790?
There are 5 known substitutes for A311790: 123737, MS35292-10, FFS85TYPEIISTYLE and 2 more. Substitute compatibility should be verified for your specific system.
What is the NSN for A311790?
A311790 is cataloged in the U.S. Government catalog under NSN 5305-00-012-3737. 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.