PartsTable
Technical Data Sheet
1/4-28UNF-2B ✓ 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 1/4-28UNF-2B is a the manufacturer industrial component. This product is currently in active production with full OEM support. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-01-017-6518, 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
1/4-28UNF-2B
NSN: 5310-01-017-6518
FSC: 5310
CAGE: 07679 — HARDWARE SPECIALTY CO. INC. DBA HARDWARE SPECIALTY CO INC (USA)
SPECIFICATIONS
Part Number1/4-28UNF-2B
NSN5310-01-017-6518
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 1/4-28UNF-2B · 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
SURFACE TREATMENT: PASSIVATE OVERALL
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: MIL-F-14072,E300 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL
MATERIAL DOCUMENT AND CLASSIFICATION: MIL-S-7720 MIL SPEC ALL MATERIAL RESPONSES OVERALL
THREAD QUANTITY PER INCH: 28
NOMINAL THREAD SIZE: 0.250 INCHES IN
THREAD SERIES: UNF
BEARING SURFACE TYPE: CHAMFERED
MATERIAL: STEEL COMP 302 OR STEEL COMP 303S OR STEEL COMP 303SE OR STEEL COMP 316 OVERALL
TECHNICAL CHARACTERISTICS (FLIS)
SURFACE TREATMENTPASSIVATE OVERALL
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONMIL-F-14072,E300 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-S-7720 MIL SPEC ALL MATERIAL RESPONSES OVERALL
THREAD QUANTITY PER INCH28
NOMINAL THREAD SIZE0.250 INCHES IN
THREAD SERIESUNF
BEARING SURFACE TYPECHAMFERED
MATERIALSTEEL COMP 302 OR STEEL COMP 303S OR STEEL COMP 303SE OR STEEL COMP 316 OVERALL
NUT STYLEHEXAGON
WIDTH ACROSS FLATS0.302 INCHES MINIMUM AND 0.313 INCHES MAXIMUM IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 6
M45913/1-4FS3Interchangeable
interchangeable cross-reference
interchangeable
1-4-28UNF2BInterchangeable
interchangeable cross-reference
interchangeable
MIL-DTL-45913/1Interchangeable
interchangeable cross-reference
interchangeable
MIL-S-1222Interchangeable
interchangeable cross-reference
interchangeable
MIL-DTL-1222Interchangeable
interchangeable cross-reference
interchangeable
1/4-28UNF-2BInterchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 1/4-28UNF-2B?
1/4-28UNF-2B is a 1/4-28UNF-2B.
What parts can replace 1/4-28UNF-2B?
There are 6 known substitutes for 1/4-28UNF-2B: M45913/1-4FS3, 1-4-28UNF2B, MIL-DTL-45913/1 and 3 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 1/4-28UNF-2B?
1/4-28UNF-2B is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-01-017-6518. This indicates validated use in U.S. government and defense supply chains.
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