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PartsTable / COMPONENT / SMB187057
SMB187057 ✓ 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 SETSCREW is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, head_style: HEADLESS (SETSCREW), point_style: FLAT, thread_class: 2A A, thread_length: 0.281 INCHES MINIMUM IN, fastener_length: 0.687 INCHES NOMINAL 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 5305-00-521-8650, 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
SMB187057
NSN: 5305-00-521-8650
FSC: 5305
CAGE: 80063 — US ARMY COMMUNICATIONS & ELECTRONICS MATERIEL READINESS COMMAND LOGISTICS ENGINEERING DIR (USA)
SPECIFICATIONS
materialSTEEL OVERALL
head_styleHEADLESS (SETSCREW)
point_styleFLAT
thread_class2A A
thread_length0.281 INCHES MINIMUM IN
fastener_length0.687 INCHES NOMINAL IN
hardness_rating43.0 ROCKWELL C MINIMUM AND 48.0 ROCKWELL C MAXIMUM OVERALL
thread_directionRIGHT-HAND
surface_treatmentPHOSPHATE OVERALL
internal_drive_styleSLOT
nominal_thread_diameter0.138 INCHES IN
thread_quantity_per_inch40
NSN5305-00-521-8650
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: SMB187057 · 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 LENGTH: 0.281 INCHES MINIMUM IN
•
INTERNAL DRIVE STYLE: SLOT
•
MATERIAL: STEEL OVERALL
•
SURFACE TREATMENT: PHOSPHATE OVERALL
•
HARDNESS RATING: 43.0 ROCKWELL C MINIMUM AND 48.0 ROCKWELL C MAXIMUM OVERALL
•
THREAD SERIES DESIGNATOR: UNF
•
HEAD STYLE: HEADLESS (SETSCREW)
•
THREAD CLASS: 2A A
TECHNICAL CHARACTERISTICS (FLIS)
THREAD LENGTH0.281 INCHES MINIMUM IN
INTERNAL DRIVE STYLESLOT
MATERIALSTEEL OVERALL
SURFACE TREATMENTPHOSPHATE OVERALL
HARDNESS RATING43.0 ROCKWELL C MINIMUM AND 48.0 ROCKWELL C MAXIMUM OVERALL
THREAD SERIES DESIGNATORUNF
HEAD STYLEHEADLESS (SETSCREW)
THREAD CLASS2A A
THREAD QUANTITY PER INCH40
THREAD DIRECTIONRIGHT-HAND
VERIFIED SUBSTITUTES & CROSS-REFERENCES 8
M4503Interchangeable
interchangeable cross-reference
interchangeable
FP4503Interchangeable
interchangeable cross-reference
interchangeable
40446Interchangeable
interchangeable cross-reference
interchangeable
7901521-2Interchangeable
interchangeable cross-reference
interchangeable
AY100UY-59-A6Interchangeable
interchangeable cross-reference
interchangeable
10CT-302-E-36/10Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is SMB187057?
SMB187057 is a SETSCREW.
What parts can replace SMB187057?
There are 8 known substitutes for SMB187057: M4503, FP4503, 40446 and 5 more. Substitute compatibility should be verified for your specific system.
What is the NSN for SMB187057?
SMB187057 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-00-521-8650. 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