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Technical Data Sheet
PartsTable / COMPONENT / 1-4-28UNF2B
1-4-28UNF2B ✓ Verified by PartsTable
— · NUT WASHER
WHAT YOU NEED TO KNOW
Match nut grade to bolt grade for full strength Lock nuts prevent loosening under vibration
Don't mix grades — weakens the joint
PRODUCT OVERVIEW

The LOCKNUT is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, nut_style: HEXAGON, nut_height: 0.212 INCHES MINIMUM AND 0.226 INCHES MAXIMUM IN, thread_class: 2B, thread_series: UNF, 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 5310-00-143-6102, 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
1-4-28UNF2B
NSN: 5310-00-143-6102
FSC: 5310
CAGE: D9182 — ZF INDUSTRIEANTRIEBE WITTEN GMBH (DEU)
SPECIFICATIONS
materialSTEEL OVERALL
nut_styleHEXAGON
nut_height0.212 INCHES MINIMUM AND 0.226 INCHES MAXIMUM IN
thread_class2B
thread_seriesUNF
thread_directionRIGHT-HAND
surface_treatmentZINC OVERALL
width_across_flats0.428 INCHES MINIMUM AND 0.438 INCHES MAXIMUM IN
nominal_thread_size0.250 INCHES IN
bearing_surface_typeFLAT OR WASHER FACED
thread_quantity_per_inch28
criticality_code_justificationZZZY
NSN5310-00-143-6102
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 1-4-28UNF2B · 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
•
THREAD DIRECTION: RIGHT-HAND
•
NUT STYLE: HEXAGON
•
MATERIAL: STEEL COMP 303 NUT
•
BEARING SURFACE FINISH: 125.0 MICROINCHES
•
NOMINAL THREAD SIZE: 0.250 INCHES IN
•
BEARING SURFACE TYPE: CHAMFERED OR WASHER FACED
•
WIDTH ACROSS FLATS: 0.428 INCHES MINIMUM AND 0.439 INCHES MAXIMUM IN
•
NUT HEIGHT: 0.298 INCHES MINIMUM AND 0.328 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS (FLIS)
THREAD DIRECTIONRIGHT-HAND
NUT STYLEHEXAGON
MATERIALSTEEL COMP 303 NUT
BEARING SURFACE FINISH125.0 MICROINCHES
NOMINAL THREAD SIZE0.250 INCHES IN
BEARING SURFACE TYPECHAMFERED OR WASHER FACED
WIDTH ACROSS FLATS0.428 INCHES MINIMUM AND 0.439 INCHES MAXIMUM IN
NUT HEIGHT0.298 INCHES MINIMUM AND 0.328 INCHES MAXIMUM IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-35,TY 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL EXCEPT INSERT
TEMP RATING250.0 FAHRENHEIT NOMINAL DEGF
VERIFIED SUBSTITUTES & CROSS-REFERENCES 9
107304-104Interchangeable
interchangeable cross-reference
interchangeable
1/4-28UNF-2BInterchangeable
interchangeable cross-reference
interchangeable
1-4-28UNF2BInterchangeable
interchangeable cross-reference
interchangeable
MIL-S-1222Interchangeable
interchangeable cross-reference
interchangeable
MIL-DTL-1222Interchangeable
interchangeable cross-reference
interchangeable
M45913/1-4FS3Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 1-4-28UNF2B?
1-4-28UNF2B is a LOCKNUT.
What parts can replace 1-4-28UNF2B?
There are 9 known substitutes for 1-4-28UNF2B: 107304-104, 1/4-28UNF-2B, 1-4-28UNF2B and 6 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 1-4-28UNF2B?
1-4-28UNF2B is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-143-6102. 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