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12137-6 — NUT,PLAIN,SQUARE

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

12137-6: NUT,PLAIN,SQUARE.

The NUT,PLAIN,SQUARE is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, nut_style: SQUARE, nut_height: 0.203 INCHES MINIMUM AND 0.235 INCHES MAXIMUM IN, thread_class: 2B, thread_series: UNIFIED NATIONAL COARSE (UNC), hardness_rating: 103.0 BRINELL STANDARD MINIMUM. This part is cataloged in the U.S.

Government catalog under NSN 5310-00-982-4938, 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
12137-6
NSN: 5310-00-982-4938
FSC: 5310 — Nuts and Washers
CAGE: 91340 — MET-PRO CORPORATION (USA)
SPECIFICATIONS
materialSTEEL OVERALL
nut_styleSQUARE
nut_height0.203 INCHES MINIMUM AND 0.235 INCHES MAXIMUM IN
thread_class2B
thread_seriesUNIFIED NATIONAL COARSE (UNC)
hardness_rating103.0 BRINELL STANDARD MINIMUM
thread_directionRIGHT-HAND
surface_treatmentCADMIUM OVERALL
width_across_flats0.425 INCHES MINIMUM AND 0.4375 INCHES MAXIMUM IN
nominal_thread_size0.250 INCHES IN
bearing_surface_typeWASHER FACED
thread_quantity_per_inch20
NSN5310-00-982-4938
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 12137-6 · 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
•
WIDTH ACROSS FLATS: 0.425 INCHES MINIMUM AND 0.4375 INCHES MAXIMUM IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-416,TY 2,CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
•
THREAD SERIES: UNIFIED NATIONAL COARSE (UNC)
•
HARDNESS RATING: 103.0 BRINELL STANDARD MINIMUM
•
THREAD DIRECTION: RIGHT-HAND
•
NOMINAL THREAD SIZE: 0.250 INCHES IN
•
NUT HEIGHT: 0.203 INCHES MINIMUM AND 0.235 INCHES MAXIMUM IN
•
SURFACE TREATMENT: CADMIUM OVERALL
TECHNICAL CHARACTERISTICS
WIDTH ACROSS FLATS0.425 INCHES MINIMUM AND 0.4375 INCHES MAXIMUM IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-416,TY 2,CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
THREAD SERIESUNIFIED NATIONAL COARSE (UNC)
HARDNESS RATING103.0 BRINELL STANDARD MINIMUM
THREAD DIRECTIONRIGHT-HAND
NOMINAL THREAD SIZE0.250 INCHES IN
NUT HEIGHT0.203 INCHES MINIMUM AND 0.235 INCHES MAXIMUM IN
SURFACE TREATMENTCADMIUM OVERALL
NUT STYLESQUARE
THREAD CLASS2B
SUBSTITUTES & CROSS-REFERENCES 8
12135-6Reference document
Same NSN cross-reference
Reference document — Secondary reference
11688Reference document
Same NSN cross-reference
Reference document — Secondary reference
FFB571TYPEAReference document
Same NSN cross-reference
Reference document — Identification reference
MS27040-10Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
120372Reference document
Same NSN cross-reference
Reference document — Secondary reference
MS21304-1Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusCancelled· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 12137-6?
12137-6 is a NUT,PLAIN,SQUARE.
What parts can replace 12137-6?
There are 8 known substitutes for 12137-6: 12135-6, 11688, FFB571TYPEA and 5 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 12137-6?
12137-6 is cataloged in the U.S. Government catalog under NSN 5310-00-982-4938. 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.