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Technical Data Sheet
PartsTable / COMPONENT / S-21140
S-21140 ✓ 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 special_features: KIT CONSISTS OF NUT 2; WASHER 2, AND U-BOLT 1, nominal_thread_diameter: 0.875 INCHES IN, thread_series_designator: UNF, part_name_assigned_by_controlling_agency: KIT, U-BOLT, AXLE. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5306-01-645-8438, 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
S-21140
NSN: 5306-01-645-8438
FSC: 5306
CAGE: 4Q4K2 — HENDRICKSON TRAILER SUSPENSION SYSTEMS (USA)
SPECIFICATIONS
special_featuresKIT CONSISTS OF NUT 2; WASHER 2, AND U-BOLT 1
nominal_thread_diameter0.875 INCHES IN
thread_series_designatorUNF
part_name_assigned_by_controlling_agencyKIT, U-BOLT, AXLE
NSN5306-01-645-8438
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: S-21140 · 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: UNF
•
NOMINAL THREAD DIAMETER: 0.875 INCHES IN
TECHNICAL CHARACTERISTICS (FLIS)
PART NAME ASSIGNED BY CONTROLLING AGENCYKIT, U-BOLT, AXLE
THREAD SERIES DESIGNATORUNF
SPECIAL FEATURESKIT CONSISTS OF NUT 2; WASHER 2, AND U-BOLT 1
NOMINAL THREAD DIAMETER0.875 INCHES IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 10
S3RTFInterchangeable
interchangeable cross-reference
interchangeable
SWE902020Interchangeable
interchangeable cross-reference
interchangeable
R60105A323A18S0000Interchangeable
interchangeable cross-reference
interchangeable
700026Interchangeable
interchangeable cross-reference
interchangeable
R6Interchangeable
interchangeable cross-reference
interchangeable
SSR6X3AInterchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is S-21140?
S-21140 is a BOLT,U.
What parts can replace S-21140?
There are 10 known substitutes for S-21140: S3RTF, SWE902020, R60105A323A18S0000 and 7 more. Substitute compatibility should be verified for your specific system.
What is the NSN for S-21140?
S-21140 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5306-01-645-8438. 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