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31CSLN2Z — NUT,PLAIN,EXTENDED WASHER,HEXAGO

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

31CSLN2Z: 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: 0.281 INCHES NOMINAL IN, hardness_rating: 40.0 ROCKWELL C MAXIMUM. This part is cataloged in the U.S.

Government catalog under NSN 5310-01-592-2747, 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
31CSLN2Z
NSN: 5310-01-592-2747
FSC: 5310 — Nuts and Washers
CAGE: 0PHV1 — EARNEST MACHINE PRODUCTS CO DBA EARNEST MACHINE PRODUCTS CO (USA)
SPECIFICATIONS
materialSTEEL OVERALL
nut_styleHEXAGON
thread_class2B
thread_seriesUNIFIED NATIONAL COARSE (UNC)
overall_height0.281 INCHES NOMINAL IN
hardness_rating40.0 ROCKWELL C MAXIMUM
special_featuresNUT HAS A SERRATED-FLANGE ARMED WITH TEETH-LIKE SERRATIONS WHICH BITE INTO SURFACES TO RESIST VIBRATION.
thread_directionRIGHT-HAND
washer_thickness0.100 INCHES NOMINAL IN
surface_treatmentZINC OVERALL
width_across_flats0.500 INCHES NOMINAL IN
nominal_thread_size0.312 INCHES IN
NSN5310-01-592-2747
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 31CSLN2Z · 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: 0.672 INCHES NOMINAL IN
•
WIDTH ACROSS FLATS: 0.500 INCHES NOMINAL IN
•
THREAD SERIES: UNIFIED NATIONAL COARSE (UNC)
•
HARDNESS RATING: 40.0 ROCKWELL C MAXIMUM
•
WASHER THICKNESS: 0.100 INCHES NOMINAL IN
•
THREAD DIRECTION: RIGHT-HAND
•
NOMINAL THREAD SIZE: 0.312 INCHES IN
TECHNICAL CHARACTERISTICS
OVERALL HEIGHT0.281 INCHES NOMINAL IN
WASHER OUTSIDE DIAMETER0.672 INCHES NOMINAL IN
WIDTH ACROSS FLATS0.500 INCHES NOMINAL IN
THREAD SERIESUNIFIED NATIONAL COARSE (UNC)
HARDNESS RATING40.0 ROCKWELL C MAXIMUM
WASHER THICKNESS0.100 INCHES NOMINAL IN
THREAD DIRECTIONRIGHT-HAND
NOMINAL THREAD SIZE0.312 INCHES IN
SPECIAL FEATURESNUT HAS A SERRATED-FLANGE ARMED WITH TEETH-LIKE SERRATIONS WHICH BITE INTO SURFACES TO RESIST VIBRATION.
SURFACE TREATMENTZINC OVERALL
SUBSTITUTES & CROSS-REFERENCES 1
94831A030Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
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 31CSLN2Z?
31CSLN2Z is a NUT,PLAIN,EXTENDED WASHER,HEXAGO.
What parts can replace 31CSLN2Z?
There is 1 known substitute for 31CSLN2Z: 94831A030. Substitute compatibility should be verified for your specific system.
What is the NSN for 31CSLN2Z?
31CSLN2Z is cataloged in the U.S. Government catalog under NSN 5310-01-592-2747. 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.