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426371 — SCREW,CAP,SOCKET HEAD

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

426371: SCREW,CAP,SOCKET HEAD.

The SCREW,CAP,SOCKET HEAD is a the manufacturer industrial component. Key specifications include material: STEEL COMP 4130 OVERALL, head_style: FLAT CHAMFER, head_height: 0.368 INCHES MINIMUM AND 0.375 INCHES MAXIMUM IN, thread_class: 3A A, head_diameter: 0.553 INCHES MINIMUM AND 0.562 INCHES MAXIMUM IN, thread_length: 1.250 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5305-01-031-4487, 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
426371
NSN: 5305-01-031-4487
FSC: 5305 — Screws
CAGE: 24617 — GENERAL MOTORS CORP (USA)
SPECIFICATIONS
materialSTEEL COMP 4130 OVERALL
head_styleFLAT CHAMFER
head_height0.368 INCHES MINIMUM AND 0.375 INCHES MAXIMUM IN
thread_class3A A
head_diameter0.553 INCHES MINIMUM AND 0.562 INCHES MAXIMUM IN
thread_length1.250 INCHES MAXIMUM IN
fastener_length1.500 INCHES MINIMUM IN
hardness_rating35.0 ROCKWELL C MINIMUM AND 43.0 ROCKWELL C MAXIMUM OVERALL
thread_directionRIGHT-HAND
surface_treatmentCADMIUM AND ZINC OVERALL
width_across_flats0.3125 INCHES MINIMUM AND 0.3155 INCHES MAXIMUM IN
internal_drive_styleHEXAGON
NSN5305-01-031-4487
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 426371 · 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
•
WIDTH ACROSS FLATS: 0.3125 INCHES MINIMUM AND 0.3155 INCHES MAXIMUM IN
•
HEAD HEIGHT: 0.368 INCHES MINIMUM AND 0.375 INCHES MAXIMUM IN
•
FASTENER LENGTH: 1.500 INCHES MINIMUM IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-416,TYPE 1,CLASS C FED SPEC 1ST TREATMENT RESPONSE AND QQ-Z-325,TYPE 1,CLASS 3 FED SPEC 2ND TREATMENT RESPONSE OVERALL
•
THREAD LENGTH: 1.250 INCHES MAXIMUM IN
•
HARDNESS RATING: 35.0 ROCKWELL C MINIMUM AND 43.0 ROCKWELL C MAXIMUM OVERALL
•
MATERIAL DOCUMENT AND CLASSIFICATION: AISI ASSN STD SINGLE MATERIAL RESPONSE OVERALL
•
NOMINAL THREAD DIAMETER: 0.375 INCHES IN
TECHNICAL CHARACTERISTICS
WIDTH ACROSS FLATS0.3125 INCHES MINIMUM AND 0.3155 INCHES MAXIMUM IN
HEAD HEIGHT0.368 INCHES MINIMUM AND 0.375 INCHES MAXIMUM IN
FASTENER LENGTH1.500 INCHES MINIMUM IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-416,TYPE 1,CLASS C FED SPEC 1ST TREATMENT RESPONSE AND QQ-Z-325,TYPE 1,CLASS 3 FED SPEC 2ND TREATMENT RESPONSE OVERALL
THREAD LENGTH1.250 INCHES MAXIMUM IN
HARDNESS RATING35.0 ROCKWELL C MINIMUM AND 43.0 ROCKWELL C MAXIMUM OVERALL
MATERIAL DOCUMENT AND CLASSIFICATIONAISI ASSN STD SINGLE MATERIAL RESPONSE OVERALL
NOMINAL THREAD DIAMETER0.375 INCHES IN
HEAD STYLEFLAT CHAMFER
THREAD DIRECTIONRIGHT-HAND
OTHER ITEMS IN FSC 5305 — Screws
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5305-00-001-5016 5305-00-001-9160 5305-00-001-9629 5305-00-001-9742 5305-00-001-9768 5305-00-003-4306 5305-00-003-6694 5305-00-003-6753
SUBSTITUTES & CROSS-REFERENCES

No substitute or cross-reference records for this part.

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 426371?
426371 is a SCREW,CAP,SOCKET HEAD.
What is the NSN for 426371?
426371 is cataloged in the U.S. Government catalog under NSN 5305-01-031-4487. 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.