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Technical Data Sheet
PartsTable / COMPONENT / 1A2251
1A2251 ✓ 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,MACHINE is a the manufacturer industrial component. Key specifications include head_style: FILLISTER, head_height: 0.094 INCHES NOMINAL IN, thread_class: 2A A, head_diameter: 0.562 INCHES NOMINAL IN, thread_length: 0.438 INCHES MINIMUM IN, screw_material: STEEL COMP 1212. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-00-736-8279, 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
1A2251
NSN: 5305-00-736-8279
FSC: 5305
CAGE: 62265 — VOLVO TRUCKS NORTH AMERICA, INC. DBA (FOREIGN PARENT IS VOLVO LASTVAGNAR AB, GOTEBORG, SWEDEN.) (USA)
SPECIFICATIONS
head_styleFILLISTER
head_height0.094 INCHES NOMINAL IN
thread_class2A A
head_diameter0.562 INCHES NOMINAL IN
thread_length0.438 INCHES MINIMUM IN
screw_materialSTEEL COMP 1212
fastener_length0.469 INCHES NOMINAL IN
thread_directionRIGHT-HAND
internal_drive_styleCROSS RECESS TYPE 1
nominal_thread_diameter0.250 INCHES IN
thread_quantity_per_inch28
thread_series_designatorUNF
NSN5305-00-736-8279
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 1A2251 · 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
•
THREAD QUANTITY PER INCH: 28
•
INTERNAL DRIVE STYLE: CROSS RECESS TYPE 1
•
NOMINAL THREAD DIAMETER: 0.250 INCHES IN
•
FASTENER LENGTH: 0.469 INCHES NOMINAL IN
•
THREAD SERIES DESIGNATOR: UNF
•
THREAD CLASS: 2A A
•
HEAD DIAMETER: 0.562 INCHES NOMINAL IN
•
SCREW MATERIAL DOCUMENT AND CLASSIFICATION: QQ-S-633 FED SPEC SINGLE MATERIAL RESPONSE
TECHNICAL CHARACTERISTICS (FLIS)
THREAD QUANTITY PER INCH28
INTERNAL DRIVE STYLECROSS RECESS TYPE 1
NOMINAL THREAD DIAMETER0.250 INCHES IN
FASTENER LENGTH0.469 INCHES NOMINAL IN
THREAD SERIES DESIGNATORUNF
THREAD CLASS2A A
HEAD DIAMETER0.562 INCHES NOMINAL IN
SCREW MATERIAL DOCUMENT AND CLASSIFICATIONQQ-S-633 FED SPEC SINGLE MATERIAL RESPONSE
HEAD STYLEFILLISTER
HEAD HEIGHT0.094 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 4
D1046Interchangeable
interchangeable cross-reference
interchangeable
E682Interchangeable
interchangeable cross-reference
interchangeable
E-637Interchangeable
interchangeable cross-reference
interchangeable
SN74HC86NInterchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 1A2251?
1A2251 is a SCREW,MACHINE.
What parts can replace 1A2251?
There are 4 known substitutes for 1A2251: D1046, E682, E-637 and 1 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 1A2251?
1A2251 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-00-736-8279. 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