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Technical Data Sheet
PartsTable / COMPONENT / HFU7900-12D-M-1
HFU7900-12D-M-1 ✓ 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 BOLT,INTERNAL WRENCHING is a the manufacturer industrial component. Key specifications include head_height: 0.308 INCHES MINIMUM AND 0.315 INCHES MAXIMUM IN, thread_class: 3A A, thread_length: 0.625 INCHES MAXIMUM IN, fastener_length: 0.625 INCHES MAXIMUM IN, thread_direction: RIGHT-HAND, surface_treatment: CADMIUM OVERALL. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5306-01-203-6812, 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
HFU7900-12D-M-1
NSN: 5306-01-203-6812
FSC: 5306
CAGE: 97928 — HUCK INTL INC (USA)
SPECIFICATIONS
head_height0.308 INCHES MINIMUM AND 0.315 INCHES MAXIMUM IN
thread_class3A A
thread_length0.625 INCHES MAXIMUM IN
fastener_length0.625 INCHES MAXIMUM IN
thread_directionRIGHT-HAND
surface_treatmentCADMIUM OVERALL
width_across_flats0.219 INCHES MINIMUM AND 0.221 INCHES MAXIMUM IN
width_between_flats0.489 INCHES MINIMUM AND 0.500 INCHES MAXIMUM IN
nominal_thread_diameter0.250 INCHES IN
extended_washer_diameter0.625 INCHES NOMINAL IN
first_diameter_from_head0.205 INCHES MINIMUM AND 0.206 INCHES MAXIMUM IN
thread_quantity_per_inch28
NSN5306-01-203-6812
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: HFU7900-12D-M-1 · 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
•
FIRST DIAMETER FROM HEAD: 0.205 INCHES MINIMUM AND 0.206 INCHES MAXIMUM IN
•
EXTENDED WASHER DIAMETER: 0.625 INCHES NOMINAL IN
•
DISTANCE FROM LARGEST BEARING SURFACE OF HEAD TO END OF FIRST DIAMETER: 0.563 INCHES NOMINAL IN
•
WIDTH BETWEEN FLATS: 0.489 INCHES MINIMUM AND 0.500 INCHES MAXIMUM IN
•
EXTERNALLY RELIEVED BODY DIAMETER QUANTITY: 1
•
EXTENDED WASHER THICKNESS: 0.055 INCHES MINIMUM AND 0.065 INCHES MAXIMUM IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-416,TYPE II,CL 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
•
HEAD HEIGHT: 0.308 INCHES MINIMUM AND 0.315 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS (FLIS)
FIRST DIAMETER FROM HEAD0.205 INCHES MINIMUM AND 0.206 INCHES MAXIMUM IN
EXTENDED WASHER DIAMETER0.625 INCHES NOMINAL IN
DISTANCE FROM LARGEST BEARING SURFACE OF HEAD TO END OF FIRST DIAMETER0.563 INCHES NOMINAL IN
WIDTH BETWEEN FLATS0.489 INCHES MINIMUM AND 0.500 INCHES MAXIMUM IN
EXTERNALLY RELIEVED BODY DIAMETER QUANTITY1
EXTENDED WASHER THICKNESS0.055 INCHES MINIMUM AND 0.065 INCHES MAXIMUM IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-416,TYPE II,CL 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
HEAD HEIGHT0.308 INCHES MINIMUM AND 0.315 INCHES MAXIMUM IN
FASTENER LENGTH0.625 INCHES MAXIMUM IN
THREAD DIRECTIONRIGHT-HAND
VERIFIED SUBSTITUTES & CROSS-REFERENCES 10
25493R1Upgraded Successor
successor cross-reference
successor
ESP-B-2.121-PPUpgraded Successor
successor cross-reference
successor
S-257-1Upgraded Successor
successor cross-reference
successor
S258-1Interchangeable
interchangeable cross-reference
interchangeable
206-8EInterchangeable
interchangeable cross-reference
interchangeable
CTS-206-8EInterchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is HFU7900-12D-M-1?
HFU7900-12D-M-1 is a BOLT,INTERNAL WRENCHING.
What parts can replace HFU7900-12D-M-1?
There are 10 known substitutes for HFU7900-12D-M-1: 25493R1, ESP-B-2.121-PP, S-257-1 and 7 more. Substitute compatibility should be verified for your specific system.
What is the NSN for HFU7900-12D-M-1?
HFU7900-12D-M-1 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5306-01-203-6812. This indicates validated use in U.S. government and defense supply chains.
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PartsTable Design LLC · partstable.com
Last verified: July 2026