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Technical Data Sheet
PartsTable / COMPONENT / 6AX257
6AX257 ✓ Verified by PartsTable
— · BOLT SCREW
WHAT YOU NEED TO KNOW
Grade/class stamped on head determines strength Metric and imperial threads look similar — measure pitch
Verify thread pitch — metric != imperial
PRODUCT OVERVIEW

The SCREW,TAPPING is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, head_style: HEXAGON EXTENDED WASHER, head_height: 0.105 INCHES MINIMUM AND 0.108 INCHES MAXIMUM IN, fastener_length: 0.312 INCHES NOMINAL IN, surface_treatment: CADMIUM OVERALL, width_between_flats: 0.244 INCHES MINIMUM AND 0.250 INCHES MAXIMUM IN. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-00-451-1623, 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
6AX257
NSN: 5305-00-451-1623
FSC: 5305
CAGE: 75Q65 — OSHKOSH DEFENSE LLC (USA)
SPECIFICATIONS
materialSTEEL OVERALL
head_styleHEXAGON EXTENDED WASHER
head_height0.105 INCHES MINIMUM AND 0.108 INCHES MAXIMUM IN
fastener_length0.312 INCHES NOMINAL IN
surface_treatmentCADMIUM OVERALL
width_between_flats0.244 INCHES MINIMUM AND 0.250 INCHES MAXIMUM IN
internal_drive_styleSLOT
nonmachine_thread_styleGIMLET POINT (TYPE A, AB OR BA)
extended_washer_diameter0.302 INCHES MINIMUM AND 0.328 INCHES MAXIMUM IN
extended_washer_thickness0.015 INCHES MINIMUM AND 0.025 INCHES MAXIMUM IN
nonmachine_nominal_thread_diameter0.138 INCHES IN
surface_treatment_document_and_classificationQQ-P-416,TY 1,CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
NSN5305-00-451-1623
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 6AX257 · 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
•
FASTENER LENGTH: 0.312 INCHES NOMINAL IN
•
NONMACHINE NOMINAL THREAD DIAMETER: 0.138 INCHES IN
•
NONMACHINE THREAD STYLE: GIMLET POINT (TYPE A, AB OR BA)
•
SURFACE TREATMENT: CADMIUM OVERALL
•
MATERIAL: STEEL OVERALL
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-416,TY 1,CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
•
HEAD STYLE: HEXAGON EXTENDED WASHER
•
HEAD HEIGHT: 0.105 INCHES MINIMUM AND 0.108 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS (FLIS)
FASTENER LENGTH0.312 INCHES NOMINAL IN
NONMACHINE NOMINAL THREAD DIAMETER0.138 INCHES IN
NONMACHINE THREAD STYLEGIMLET POINT (TYPE A, AB OR BA)
SURFACE TREATMENTCADMIUM OVERALL
MATERIALSTEEL OVERALL
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-416,TY 1,CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
HEAD STYLEHEXAGON EXTENDED WASHER
HEAD HEIGHT0.105 INCHES MINIMUM AND 0.108 INCHES MAXIMUM IN
INTERNAL DRIVE STYLESLOT
WIDTH BETWEEN FLATS0.244 INCHES MINIMUM AND 0.250 INCHES MAXIMUM IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 7
840-22Interchangeable
interchangeable cross-reference
interchangeable
M760AInterchangeable
interchangeable cross-reference
interchangeable
P27-129-01Interchangeable
interchangeable cross-reference
interchangeable
NE175Interchangeable
interchangeable cross-reference
interchangeable
B504001060Interchangeable
interchangeable cross-reference
interchangeable
15-066939-056Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 6AX257?
6AX257 is a SCREW,TAPPING.
What parts can replace 6AX257?
There are 7 known substitutes for 6AX257: 840-22, M760A, P27-129-01 and 4 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 6AX257?
6AX257 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-00-451-1623. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026