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12561700-21 — NUT,PLAIN,EXTENDED WASHER,HEXAGO

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

12561700-21: NUT,PLAIN,EXTENDED WASHER,HEXAGO.

NUT,PLAIN,EXTENDED WASHER,HEXAGO. Key specifications include material: STEEL OVERALL, nut_style: HEXAGON, thread_class: 2B, thread_series: UNIFIED NATIONAL COARSE (UNC), overall_height: 0.510 INCHES MINIMUM IN, thread_direction: RIGHT-HAND. This part is cataloged in the U.S.

Government catalog under NSN 5310-01-696-4051, 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
12561700-21
NSN: 5310-01-696-4051
FSC: 5310 — Nuts and Washers
CAGE: 19207 — U S ARMY TANK AUTOMOTIVE COMMAND AMSTA-IM-MM (USA)
SPECIFICATIONS
materialSTEEL OVERALL
nut_styleHEXAGON
thread_class2B
thread_seriesUNIFIED NATIONAL COARSE (UNC)
overall_height0.510 INCHES MINIMUM IN
thread_directionRIGHT-HAND
washer_thickness0.070 INCHES MINIMUM AND 0.090 INCHES MAXIMUM IN
surface_treatmentZINC OVERALL
width_across_flats0.736 INCHES MINIMUM AND 0.752 INCHES MAXIMUM IN
nominal_thread_size0.500 INCHES IN
end_item_identification2310-01-595-3986
washer_outside_diameter1.000 INCHES MINIMUM AND 1.031 INCHES MAXIMUM IN
NSN5310-01-696-4051
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 12561700-21 · 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
•
WASHER OUTSIDE DIAMETER: 1.000 INCHES MINIMUM AND 1.031 INCHES MAXIMUM IN
•
WIDTH ACROSS FLATS: 0.736 INCHES MINIMUM AND 0.752 INCHES MAXIMUM IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: CAGE 19207, DWG 12469117 MFR REF SINGLE TREATMENT RESPONSE OVERALL
•
THREAD SERIES: UNIFIED NATIONAL COARSE (UNC)
•
WASHER THICKNESS: 0.070 INCHES MINIMUM AND 0.090 INCHES MAXIMUM IN
•
THREAD DIRECTION: RIGHT-HAND
•
NOMINAL THREAD SIZE: 0.500 INCHES IN
TECHNICAL CHARACTERISTICS
OVERALL HEIGHT0.510 INCHES MINIMUM IN
WASHER OUTSIDE DIAMETER1.000 INCHES MINIMUM AND 1.031 INCHES MAXIMUM IN
WIDTH ACROSS FLATS0.736 INCHES MINIMUM AND 0.752 INCHES MAXIMUM IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONCAGE 19207, DWG 12469117 MFR REF SINGLE TREATMENT RESPONSE OVERALL
THREAD SERIESUNIFIED NATIONAL COARSE (UNC)
WASHER THICKNESS0.070 INCHES MINIMUM AND 0.090 INCHES MAXIMUM IN
THREAD DIRECTIONRIGHT-HAND
NOMINAL THREAD SIZE0.500 INCHES IN
SURFACE TREATMENTZINC OVERALL
PART NAME ASSIGNED BY CONTROLLING AGENCYNUT,SELF-LOCKING,ALL METAL,FLANGED
SUBSTITUTES & CROSS-REFERENCES 1
12561700Reference document
Same NSN cross-reference
Reference document — Drawing number reference only
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 12561700-21?
12561700-21 is a NUT,PLAIN,EXTENDED WASHER,HEXAGO.
What parts can replace 12561700-21?
There is 1 known substitute for 12561700-21: 12561700. Substitute compatibility should be verified for your specific system.
What is the NSN for 12561700-21?
12561700-21 is cataloged in the U.S. Government catalog under NSN 5310-01-696-4051. 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.