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Technical Data Sheet
PartsTable / COMPONENT / SM-B-187165
SM-B-187165 ✓ 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,ECCENTRIC HEAD is a the manufacturer industrial component. Key specifications include material: STEEL COMP 303 OVERALL, head_height: 0.078 INCHES NOMINAL IN, thread_class: 2A A, fastener_length: 0.219 INCHES NOMINAL IN, special_features: EXTENTION ON FLAT 0.188 IN. LG,WITH SLOT IN, thread_direction: RIGHT-HAND.

This product is currently in active production with full OEM support. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5306-00-591-0870, 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
SM-B-187165
NSN: 5306-00-591-0870
FSC: 5306
CAGE: 80063 — US ARMY COMMUNICATIONS & ELECTRONICS MATERIEL READINESS COMMAND LOGISTICS ENGINEERING DIR (USA)
SPECIFICATIONS
materialSTEEL COMP 303 OVERALL
head_height0.078 INCHES NOMINAL IN
thread_class2A A
fastener_length0.219 INCHES NOMINAL IN
special_featuresEXTENTION ON FLAT 0.188 IN. LG,WITH SLOT IN
thread_directionRIGHT-HAND
surface_treatmentPASSIVATE OVERALL
width_between_flats0.250 INCHES NOMINAL IN
nominal_thread_diameter0.138 INCHES IN
thread_quantity_per_inch40
thread_series_designatorUNF
surface_treatment_document_and_classificationQQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
NSN5306-00-591-0870
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: SM-B-187165 · 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
•
MATERIAL: STEEL COMP 303 OVERALL
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
•
FASTENER LENGTH: 0.219 INCHES NOMINAL IN
•
SURFACE TREATMENT: PASSIVATE OVERALL
•
HEAD HEIGHT: 0.078 INCHES NOMINAL IN
•
THREAD QUANTITY PER INCH: 40
TECHNICAL CHARACTERISTICS (FLIS)
THREAD SERIES DESIGNATORUNF
MATERIALSTEEL COMP 303 OVERALL
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
FASTENER LENGTH0.219 INCHES NOMINAL IN
SURFACE TREATMENTPASSIVATE OVERALL
HEAD HEIGHT0.078 INCHES NOMINAL IN
THREAD QUANTITY PER INCH40
SPECIAL FEATURESEXTENTION ON FLAT 0.188 IN. LG,WITH SLOT IN
NOMINAL THREAD DIAMETER0.138 INCHES IN
WIDTH BETWEEN FLATS0.250 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 3
55738Interchangeable
interchangeable cross-reference
interchangeable
150Interchangeable
Vise,machinist's
interchangeable
500SInterchangeable
Vise,machinist's
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is SM-B-187165?
SM-B-187165 is a BOLT,ECCENTRIC HEAD.
What parts can replace SM-B-187165?
There are 3 known substitutes for SM-B-187165: 55738, 150, 500S. Substitute compatibility should be verified for your specific system.
What is the NSN for SM-B-187165?
SM-B-187165 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5306-00-591-0870. 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