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Technical Data Sheet
PartsTable / COMPONENT / 255W4
255W4 ✓ 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,U is a the manufacturer industrial component. Key specifications include material: STEEL COMP 1017 OR STEEL COMP 1015 OR STEEL COMP 1016 OR STEEL COMP 1019 OR STEEL COMP 1020 OVERALL, thread_class: 2A A, thread_length: 0.375 INCHES NOMINAL IN, style_designator: ROUND BEND, thread_direction: RIGHT-HAND, surface_treatment: CADMIUM AND CHROMATE 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 5306-00-752-1158, 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
255W4
NSN: 5306-00-752-1158
FSC: 5306
CAGE: 56442 — DIAMOND REO TRUCK CO (USA)
SPECIFICATIONS
materialSTEEL COMP 1017 OR STEEL COMP 1015 OR STEEL COMP 1016 OR STEEL COMP 1019 OR STEEL COMP 1020 OVERALL
thread_class2A A
thread_length0.375 INCHES NOMINAL IN
style_designatorROUND BEND
thread_directionRIGHT-HAND
surface_treatmentCADMIUM AND CHROMATE OVERALL
nominal_thread_diameter0.250 INCHES IN
thread_quantity_per_inch20
thread_series_designatorUNIFIED NATIONAL COARSE (UNC)
inside_distance_between_shanks0.500 INCHES NOMINAL IN
surface_treatment_document_and_classificationQQ-P-416,TY 2,CL 3 FED SPEC ALL TREATMENT RESPONSES OVERALL
distance_from_inside_center_of_bend_to_bolt_end0.787 INCHES NOMINAL IN
NSN5306-00-752-1158
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 255W4 · 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 CLASS: 2A A
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-416,TY 2,CL 3 FED SPEC ALL TREATMENT RESPONSES OVERALL
•
STYLE DESIGNATOR: ROUND BEND
•
MATERIAL: STEEL COMP 1017 OR STEEL COMP 1015 OR STEEL COMP 1016 OR STEEL COMP 1019 OR STEEL COMP 1020 OVERALL
•
THREAD SERIES DESIGNATOR: UNIFIED NATIONAL COARSE (UNC)
•
SURFACE TREATMENT: CADMIUM AND CHROMATE OVERALL
•
DISTANCE FROM INSIDE CENTER OF BEND TO BOLT END: 0.787 INCHES NOMINAL IN
•
INSIDE DISTANCE BETWEEN SHANKS: 0.500 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
THREAD CLASS2A A
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-416,TY 2,CL 3 FED SPEC ALL TREATMENT RESPONSES OVERALL
STYLE DESIGNATORROUND BEND
MATERIALSTEEL COMP 1017 OR STEEL COMP 1015 OR STEEL COMP 1016 OR STEEL COMP 1019 OR STEEL COMP 1020 OVERALL
THREAD SERIES DESIGNATORUNIFIED NATIONAL COARSE (UNC)
SURFACE TREATMENTCADMIUM AND CHROMATE OVERALL
DISTANCE FROM INSIDE CENTER OF BEND TO BOLT END0.787 INCHES NOMINAL IN
INSIDE DISTANCE BETWEEN SHANKS0.500 INCHES NOMINAL IN
THREAD QUANTITY PER INCH20
THREAD LENGTH0.375 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 14
5-16-6RUpgraded Successor
successor cross-reference
successor
103049-04Upgraded Successor
successor cross-reference
successor
GC500G5Upgraded Successor
successor cross-reference
successor
0041915-0Interchangeable
interchangeable cross-reference
interchangeable
0041915Interchangeable
interchangeable cross-reference
interchangeable
041915Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 255W4?
255W4 is a BOLT,U.
What parts can replace 255W4?
There are 14 known substitutes for 255W4: 5-16-6R, 103049-04, GC500G5 and 11 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 255W4?
255W4 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5306-00-752-1158. 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