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Technical Data Sheet
PartsTable / COMPONENT / 377 1/4-28 UNF
377 1/4-28 UNF ✓ Verified by PartsTable
— · COMPONENT
WHAT YOU NEED TO KNOW
Verify manufacturer and server generation compatibility Check if Option PN or Spare PN — same part, different channel
Confirm exact part number — similar PNs may be different parts
PRODUCT OVERVIEW

The 377 1/4-28 UNF is a the manufacturer industrial component. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5136-00-189-3120, 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
377 1/4-28 UNF
NSN: 5136-00-189-3120
FSC: 5136
CAGE: 60NQ9 — GREENFIELD INDUSTRIES INC (USA)
SPECIFICATIONS
Part Number377 1/4-28 UNF
NSN5136-00-189-3120
COMPONENT DIAGRAM
COMPONENT MAIN IC EDGE CONNECTOR No detailed specs available 377 1/4-28 UNF TITLE COMPONENT PN 377 1/4-28 UNF MFR 377 1/4-28 UNF
KEY FEATURES
•
STYLE DESIGNATOR: SOLID HEXAGON NUT
•
WIDTH ACROSS FLATS: 0.594 INCHES NOMINAL IN
•
THREAD SIZE AND SERIES/TYPE DESIGNATOR: 0.250-28 UNF
•
THICKNESS: 0.250 INCHES NOMINAL IN
•
THREAD DIRECTION: RIGHT-HAND
TECHNICAL CHARACTERISTICS (FLIS)
STYLE DESIGNATORSOLID HEXAGON NUT
WIDTH ACROSS FLATS0.594 INCHES NOMINAL IN
STYLE DESIGNATORSOLID HEXAGON NUT
THREAD SIZE AND SERIES/TYPE DESIGNATOR0.250-28 UNF
THICKNESS0.250 INCHES NOMINAL IN
THREAD SIZE AND SERIES/TYPE DESIGNATOR0.250-28 UNF
WIDTH ACROSS FLATS0.594 INCHES NOMINAL IN
THREAD DIRECTIONRIGHT-HAND
THICKNESS0.250 INCHES NOMINAL IN
THREAD PITCH DIAMETERS+0.2208 TO 0.2268 INCHES IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 24
AMS-QQA200-3Interchangeable
interchangeable cross-reference
interchangeable
LS535Interchangeable
interchangeable cross-reference
interchangeable
15923Interchangeable
interchangeable cross-reference
interchangeable
7223Interchangeable
interchangeable cross-reference
interchangeable
MIL-A-22145Interchangeable
interchangeable cross-reference
interchangeable
24110Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 377 1/4-28 UNF?
377 1/4-28 UNF is a 377 1/4-28 UNF.
What parts can replace 377 1/4-28 UNF?
There are 24 known substitutes for 377 1/4-28 UNF: AMS-QQA200-3, LS535, 15923 and 21 more. Substitute compatibility should be verified for your specific system.
Is 377 1/4-28 UNF still available?
377 1/4-28 UNF is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026