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31W256 ✓ 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 STUD,PLAIN is a the manufacturer industrial component. Key specifications include material: STEEL COMP 1040, thread_class: 3A STUD THREAD A, thread_length: 1.000 INCHES NOMINAL STUD THREAD IN, overall_length: 2.188 INCHES NOMINAL IN, hardness_rating: 29.0 ROCKWELL C MINIMUM AND 34.0 ROCKWELL C MAXIMUM, nominal_thread_size: 0.500 INCHES STUD THREAD 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 5307-00-350-2901, 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
31W256
NSN: 5307-00-350-2901
FSC: 5307
CAGE: 62265 — VOLVO TRUCKS NORTH AMERICA, INC. DBA (FOREIGN PARENT IS VOLVO LASTVAGNAR AB, GOTEBORG, SWEDEN.) (USA)
SPECIFICATIONS
materialSTEEL COMP 1040
thread_class3A STUD THREAD A
thread_length1.000 INCHES NOMINAL STUD THREAD IN
overall_length2.188 INCHES NOMINAL IN
hardness_rating29.0 ROCKWELL C MINIMUM AND 34.0 ROCKWELL C MAXIMUM
nominal_thread_size0.500 INCHES STUD THREAD IN
thread_quantity_per_inch20 STUD THREAD
thread_series_designatorUNF STUD THREAD
material_document_and_classificationASTM A322 ASSN STD SINGLE MATERIAL RESPONSE OR ASTM A331 ASSN STD SINGLE MATERIAL RESPONSE
NSN5307-00-350-2901
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 31W256 · 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 SERIES DESIGNATOR: UNIFIED NATIONAL COARSE (UNC) NUT THREAD
•
NOMINAL THREAD SIZE: 0.500 INCHES STUD THREAD IN
•
HARDNESS RATING: 29.0 ROCKWELL C MINIMUM AND 34.0 ROCKWELL C MAXIMUM
•
THREAD QUANTITY PER INCH: 20 STUD THREAD
•
MATERIAL: STEEL COMP 1040
•
THREAD LENGTH: 0.750 INCHES NOMINAL NUT THREAD IN
TECHNICAL CHARACTERISTICS (FLIS)
THREAD SERIES DESIGNATORUNIFIED NATIONAL COARSE (UNC) NUT THREAD
NOMINAL THREAD SIZE0.500 INCHES STUD THREAD IN
HARDNESS RATING29.0 ROCKWELL C MINIMUM AND 34.0 ROCKWELL C MAXIMUM
THREAD SERIES DESIGNATORUNF STUD THREAD
THREAD QUANTITY PER INCH20 STUD THREAD
MATERIALSTEEL COMP 1040
THREAD QUANTITY PER INCH13 NUT THREAD
THREAD LENGTH0.750 INCHES NOMINAL NUT THREAD IN
MATERIAL DOCUMENT AND CLASSIFICATIONASTM A322 ASSN STD SINGLE MATERIAL RESPONSE OR ASTM A331 ASSN STD SINGLE MATERIAL RESPONSE
THREAD CLASS3A STUD THREAD A
VERIFIED SUBSTITUTES & CROSS-REFERENCES 8
505145ITEM7RInterchangeable
interchangeable cross-reference
interchangeable
31912PC23AInterchangeable
interchangeable cross-reference
interchangeable
177002PC79Interchangeable
interchangeable cross-reference
interchangeable
GX82622HInterchangeable
interchangeable cross-reference
interchangeable
SPTX1423Interchangeable
interchangeable cross-reference
interchangeable
380024Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 31W256?
31W256 is a STUD,PLAIN.
What parts can replace 31W256?
There are 8 known substitutes for 31W256: 505145ITEM7R, 31912PC23A, 177002PC79 and 5 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 31W256?
31W256 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5307-00-350-2901. 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