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SM-B-187123 — PIN,SHOULDER,HEADLESS

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

SM-B-187123: PIN,SHOULDER,HEADLESS.

The PIN,SHOULDER,HEADLESS is a the manufacturer industrial component. Key specifications include material: STEEL COMP B1112 OVERALL, shank_length: 1.262 INCHES NOMINAL IN, thread_class: 2A A, thread_length: 0.312 INCHES NOMINAL IN, overall_length: 1.844 INCHES NOMINAL IN, shank_diameter: 0.1840 INCHES MINIMUM AND 0.1855 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5315-00-567-5799, 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-187123
NSN: 5315-00-567-5799
FSC: 5315 — Nails, Machine Keys, and Pins
CAGE: 80063 — US ARMY COMMUNICATIONS & ELECTRONICS MATERIEL READINESS COMMAND LOGISTICS ENGINEERING DIR (USA)
SPECIFICATIONS
materialSTEEL COMP B1112 OVERALL
shank_length1.262 INCHES NOMINAL IN
thread_class2A A
thread_length0.312 INCHES NOMINAL IN
overall_length1.844 INCHES NOMINAL IN
shank_diameter0.1840 INCHES MINIMUM AND 0.1855 INCHES MAXIMUM IN
undercut_width0.047 INCHES NOMINAL IN
first_end_styleSQUARE
special_features0.047 IN. W,0.147 IN. MIN,0.149 IN. MAX DIA UNDERCUT ON SHANK DIA END IN
style_designatorUNDERCUT
thread_directionRIGHT-HAND
features_providedCASEHARDENED
NSN5315-00-567-5799
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: SM-B-187123 · OEM ⚠ VERIFY BEFORE ORDERING Grade matters for torque spec — don't mix grades. A Grade 5 nut on a Grade 8 bolt weakens the joint. Lock nuts, wing nuts, and castle nuts are NOT interchangeable with standard hex ✓ BROKER TIP Match nut to bolt thread class and material. Stainless bolt + zinc nut = galvanic corrosion. Always verify finish matches (plain, zinc, hot-dip galvanized) PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
SHANK DIAMETER: 0.1840 INCHES MINIMUM AND 0.1855 INCHES MAXIMUM IN
•
SECOND SHANK DIAMETER: 0.164 INCHES NOMINAL IN
•
UNDERCUT WIDTH: 0.047 INCHES NOMINAL IN
•
UNDERCUT DIAMETER: 0.156 INCHES NOMINAL IN
•
FIRST END LOCATION: BOTH ENDS
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: MIL-P-16232 TY MCL 2 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL
•
THREAD LENGTH: 0.312 INCHES NOMINAL IN
•
FIRST END STYLE: SQUARE
TECHNICAL CHARACTERISTICS
SHANK DIAMETER0.1840 INCHES MINIMUM AND 0.1855 INCHES MAXIMUM IN
SECOND SHANK DIAMETER0.164 INCHES NOMINAL IN
UNDERCUT WIDTH0.047 INCHES NOMINAL IN
UNDERCUT DIAMETER0.156 INCHES NOMINAL IN
FIRST END LOCATIONBOTH ENDS
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONMIL-P-16232 TY MCL 2 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL
THREAD LENGTH0.312 INCHES NOMINAL IN
FIRST END STYLESQUARE
SHANK LENGTH1.262 INCHES NOMINAL IN
STYLE DESIGNATORUNDERCUT
SUBSTITUTES & CROSS-REFERENCES 1
56538Reference document
Same NSN cross-reference
Reference document — Design control — primary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is SM-B-187123?
SM-B-187123 is a PIN,SHOULDER,HEADLESS.
What parts can replace SM-B-187123?
There is 1 known substitute for SM-B-187123: 56538. Substitute compatibility should be verified for your specific system.
What is the NSN for SM-B-187123?
SM-B-187123 is cataloged in the U.S. Government catalog under NSN 5315-00-567-5799. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.