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ST3M875-3 — NUT,SELF-LOCKING,BARREL

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

ST3M875-3: NUT,SELF-LOCKING,BARREL.

The NUT,SELF-LOCKING,BARREL is a the manufacturer industrial component. Key specifications include material: PLASTIC POLYAMIDE NYLON LOCKING INSERT, nut_style: FLOATING SELF-LOCKING BARREL, nut_height: 0.309 INCHES MINIMUM AND 0.359 INCHES MAXIMUM IN, nut_length: 0.360 INCHES MINIMUM AND 0.390 INCHES MAXIMUM IN, temp_rating: 250.0 FAHRENHEIT MAXIMUM DEGF, nut_diameter: 0.3990 INCHES MINIMUM AND 0.4020 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5310-01-129-7612, 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
ST3M875-3
NSN: 5310-01-129-7612
FSC: 5310 — Nuts and Washers
CAGE: 76301 — THE BOEING COMPANY DIV DEFENSE (USA)
SPECIFICATIONS
materialPLASTIC POLYAMIDE NYLON LOCKING INSERT
nut_styleFLOATING SELF-LOCKING BARREL
nut_height0.309 INCHES MINIMUM AND 0.359 INCHES MAXIMUM IN
nut_length0.360 INCHES MINIMUM AND 0.390 INCHES MAXIMUM IN
temp_rating250.0 FAHRENHEIT MAXIMUM DEGF
nut_diameter0.3990 INCHES MINIMUM AND 0.4020 INCHES MAXIMUM IN
thread_class3B
barrel_height0.245 INCHES MINIMUM AND 0.265 INCHES MAXIMUM IN
thread_seriesUNIFIED NATIONAL JOINT FINE (UNJF)
locking_featurePREVAILING TORQUE WITH NONMETALLIC INSERT
thread_directionRIGHT-HAND
nominal_thread_size0.190 INCHES IN
NSN5310-01-129-7612
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: ST3M875-3 · 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
•
NUT LENGTH: 0.360 INCHES MINIMUM AND 0.390 INCHES MAXIMUM IN
•
THREAD SERIES: UNIFIED NATIONAL JOINT FINE (UNJF)
•
TEMP RATING: 250.0 FAHRENHEIT MAXIMUM DEGF
•
NUT COUNTERBORE DEPTH: 0.089 INCHES MINIMUM AND 0.109 INCHES MAXIMUM BASE IN
•
THREAD DIRECTION: RIGHT-HAND
•
NOMINAL THREAD SIZE: 0.190 INCHES IN
•
NUT DIAMETER: 0.3990 INCHES MINIMUM AND 0.4020 INCHES MAXIMUM IN
•
COUNTERBORE DIAMETER: 0.222 INCHES MINIMUM AND 0.232 INCHES MAXIMUM BASE IN
TECHNICAL CHARACTERISTICS
NUT LENGTH0.360 INCHES MINIMUM AND 0.390 INCHES MAXIMUM IN
THREAD SERIESUNIFIED NATIONAL JOINT FINE (UNJF)
TEMP RATING250.0 FAHRENHEIT MAXIMUM DEGF
NUT COUNTERBORE DEPTH0.089 INCHES MINIMUM AND 0.109 INCHES MAXIMUM BASE IN
THREAD DIRECTIONRIGHT-HAND
NOMINAL THREAD SIZE0.190 INCHES IN
NUT DIAMETER0.3990 INCHES MINIMUM AND 0.4020 INCHES MAXIMUM IN
COUNTERBORE DIAMETER0.222 INCHES MINIMUM AND 0.232 INCHES MAXIMUM BASE IN
LOCKING FEATUREPREVAILING TORQUE WITH NONMETALLIC INSERT
NUT HEIGHT0.309 INCHES MINIMUM AND 0.359 INCHES MAXIMUM IN
OTHER ITEMS IN FSC 5310 — Nuts and Washers
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5310-00-000-0040 5310-00-000-0077 5310-00-000-0079 5310-00-000-1146 5310-00-000-3815 5310-00-000-4532 5310-00-000-4540
SUBSTITUTES & CROSS-REFERENCES 2
10109543Reference document
Same NSN cross-reference
Reference document — Informative reference only
F55-2552-02Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is ST3M875-3?
ST3M875-3 is a NUT,SELF-LOCKING,BARREL.
What parts can replace ST3M875-3?
There are 2 known substitutes for ST3M875-3: 10109543, F55-2552-02. Substitute compatibility should be verified for your specific system.
What is the NSN for ST3M875-3?
ST3M875-3 is cataloged in the U.S. Government catalog under NSN 5310-01-129-7612. 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.