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1610L20-001 — NUT,PLAIN,SQUARE

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

1610L20-001: NUT,PLAIN,SQUARE.

The NUT,PLAIN,SQUARE is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, nut_style: SQUARE, nut_height: 0.250 INCHES NOMINAL IN, thread_class: 3B, thread_series: UNF, hardness_rating: 26.0 ROCKWELL C MINIMUM AND 32.0 ROCKWELL C MAXIMUM. This part is cataloged in the U.S.

Government catalog under NSN 5310-00-442-8028, 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
1610L20-001
NSN: 5310-00-442-8028
FSC: 5310 — Nuts and Washers
CAGE: 81996 — US ARMY AVIATION AND MISSILE COMMAND (USA)
SPECIFICATIONS
materialSTEEL OVERALL
nut_styleSQUARE
nut_height0.250 INCHES NOMINAL IN
thread_class3B
thread_seriesUNF
hardness_rating26.0 ROCKWELL C MINIMUM AND 32.0 ROCKWELL C MAXIMUM
thread_directionRIGHT-HAND
countersink_angle110.0 DEGREES NOMINAL NUT
surface_treatmentCADMIUM OVERALL
width_across_flats0.620 INCHES MINIMUM AND 0.625 INCHES MAXIMUM IN
nominal_thread_size0.375 INCHES IN
bearing_surface_typeFLAT
NSN5310-00-442-8028
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 1610L20-001 · 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: 0.620 INCHES MINIMUM AND 0.625 INCHES MAXIMUM IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-416,TY 1,CL 1 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
•
THREAD SERIES: UNF
•
HARDNESS RATING: 26.0 ROCKWELL C MINIMUM AND 32.0 ROCKWELL C MAXIMUM
•
MATERIAL DOCUMENT AND CLASSIFICATION: AMS 5132 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
•
THREAD DIRECTION: RIGHT-HAND
•
NOMINAL THREAD SIZE: 0.375 INCHES IN
•
NUT HEIGHT: 0.250 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
WIDTH ACROSS FLATS0.620 INCHES MINIMUM AND 0.625 INCHES MAXIMUM IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-416,TY 1,CL 1 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
THREAD SERIESUNF
HARDNESS RATING26.0 ROCKWELL C MINIMUM AND 32.0 ROCKWELL C MAXIMUM
MATERIAL DOCUMENT AND CLASSIFICATIONAMS 5132 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
THREAD DIRECTIONRIGHT-HAND
NOMINAL THREAD SIZE0.375 INCHES IN
NUT HEIGHT0.250 INCHES NOMINAL IN
SURFACE TREATMENTCADMIUM OVERALL
COUNTERSINK ANGLE110.0 DEGREES NOMINAL NUT
SUBSTITUTES & CROSS-REFERENCES 1
HM267511Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 1610L20-001?
1610L20-001 is a NUT,PLAIN,SQUARE.
What parts can replace 1610L20-001?
There is 1 known substitute for 1610L20-001: HM267511. Substitute compatibility should be verified for your specific system.
What is the NSN for 1610L20-001?
1610L20-001 is cataloged in the U.S. Government catalog under NSN 5310-00-442-8028. 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.