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 Number
1/4-28UNF-2B
NSN
5310-01-017-6518
COMPONENT DIAGRAM
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 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
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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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