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Technical Data Sheet
PartsTable / COMPONENT / 3X138
3X138 ✓ 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,SHOULDER is a the manufacturer industrial component. Key specifications include material: STEEL COMP 3135 OVERALL, head_style: HEXAGON, head_height: 0.469 INCHES NOMINAL IN, thread_class: 3A A, thread_length: 0.875 INCHES MINIMUM IN, shoulder_shape: ROUND FIRST SHOULDER. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5306-00-206-0365, 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
3X138
NSN: 5306-00-206-0365
FSC: 5306
CAGE: 78500 — MERITOR HEAVY VEHICLE SYSTEMS, LLC (USA)
SPECIFICATIONS
materialSTEEL COMP 3135 OVERALL
head_styleHEXAGON
head_height0.469 INCHES NOMINAL IN
thread_class3A A
thread_length0.875 INCHES MINIMUM IN
shoulder_shapeROUND FIRST SHOULDER
fastener_length1.875 INCHES NOMINAL IN
hardness_rating27.6 ROCKWELL C MINIMUM AND 34.3 ROCKWELL C MAXIMUM OVERALL
shoulder_length1.000 INCHES NOMINAL FIRST SHOULDER IN
thread_directionRIGHT-HAND
shoulder_diameter0.625 INCHES MINIMUM AND 0.627 INCHES MAXIMUM FIRST SHOULDER IN
width_between_flats0.938 INCHES NOMINAL IN
NSN5306-00-206-0365
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 3X138 · 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
•
SHOULDER LENGTH: 1.000 INCHES NOMINAL FIRST SHOULDER IN
•
WIDTH BETWEEN FLATS: 0.938 INCHES NOMINAL IN
•
NOMINAL THREAD DIAMETER: 0.625 INCHES IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-S-624 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
•
THREAD SERIES DESIGNATOR: UNF
•
MATERIAL: STEEL COMP 3135 OVERALL
•
THREAD QUANTITY PER INCH: 18
•
HARDNESS RATING: 27.6 ROCKWELL C MINIMUM AND 34.3 ROCKWELL C MAXIMUM OVERALL
TECHNICAL CHARACTERISTICS (FLIS)
SHOULDER LENGTH1.000 INCHES NOMINAL FIRST SHOULDER IN
WIDTH BETWEEN FLATS0.938 INCHES NOMINAL IN
NOMINAL THREAD DIAMETER0.625 INCHES IN
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-S-624 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
THREAD SERIES DESIGNATORUNF
MATERIALSTEEL COMP 3135 OVERALL
THREAD QUANTITY PER INCH18
HARDNESS RATING27.6 ROCKWELL C MINIMUM AND 34.3 ROCKWELL C MAXIMUM OVERALL
SHOULDER SHAPEROUND FIRST SHOULDER
HEAD STYLEHEXAGON
VERIFIED SUBSTITUTES & CROSS-REFERENCES 3
71602-1PIEC186Interchangeable
interchangeable cross-reference
interchangeable
10975Interchangeable
interchangeable cross-reference
interchangeable
3X138Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 3X138?
3X138 is a BOLT,SHOULDER.
What parts can replace 3X138?
There are 3 known substitutes for 3X138: 71602-1PIEC186, 10975, 3X138. Substitute compatibility should be verified for your specific system.
What is the NSN for 3X138?
3X138 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5306-00-206-0365. 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