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01770-0251 — NUT,PLAIN,SLOTTED,HEXAGON

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

01770-0251: NUT,PLAIN,SLOTTED,HEXAGON.

The NUT,PLAIN,SLOTTED,HEXAGON is a the manufacturer industrial component. Key specifications include material: STEEL COMP 1035 OR STEEL COMP 1536 OR STEEL COMP 1040 OR STEEL COMP 1137 OR STEEL COMP 1141 OVERALL, nut_style: SLOTTED, HEXAGON, nut_height: 0.308 INCHES MINIMUM AND 0.318 INCHES MAXIMUM IN, thread_class: 3B, thread_series: UNF, hardness_rating: 19.0 ROCKWELL C MINIMUM AND 26.0 ROCKWELL C MAXIMUM. This part is cataloged in the U.S.

Government catalog under NSN 5310-00-516-5059, 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
01770-0251
NSN: 5310-00-516-5059
FSC: 5310 — Nuts and Washers
CAGE: 79343 — ASRC FEDERAL FACILITIES LOGISTICS, LLC (USA)
SPECIFICATIONS
materialSTEEL COMP 1035 OR STEEL COMP 1536 OR STEEL COMP 1040 OR STEEL COMP 1137 OR STEEL COMP 1141 OVERALL
nut_styleSLOTTED, HEXAGON
nut_height0.308 INCHES MINIMUM AND 0.318 INCHES MAXIMUM IN
thread_class3B
thread_seriesUNF
hardness_rating19.0 ROCKWELL C MINIMUM AND 26.0 ROCKWELL C MAXIMUM
thread_directionRIGHT-HAND
countersink_angle88.0 DEGREES MINIMUM AND 92.0 DEGREES MAXIMUM NUT
surface_treatmentZINC OVERALL
width_across_flats0.495 INCHES MINIMUM AND 0.505 INCHES MAXIMUM IN
nominal_thread_size0.312 INCHES IN
bearing_surface_typeCHAMFERED OR WASHER FACED
NSN5310-00-516-5059
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 01770-0251 · 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: 0.495 INCHES MINIMUM AND 0.505 INCHES MAXIMUM IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-Z-325,TY 2,CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
•
THREAD SERIES: UNF
•
HARDNESS RATING: 19.0 ROCKWELL C MINIMUM AND 26.0 ROCKWELL C MAXIMUM
•
MATERIAL DOCUMENT AND CLASSIFICATION: ASTM A108 ASSN STD 1ST MATERIAL RESPONSE OR ASTM A576 ASSN STD 1ST MATERIAL RESPONSE OR QQ-S-633-CANCELED FED SPEC 2ND MATERIAL RESPONSE OR ASTM A108 ASSN STD 3RD MATERIAL RESPONSE OR QQ-S-637 FED SPEC 4TH MATERIAL RESPONSE OR QQ-S-637 FED SPEC 5TH MATERIAL RESPONSE OVERALL
•
THREAD DIRECTION: RIGHT-HAND
•
NOMINAL THREAD SIZE: 0.312 INCHES IN
•
NUT HEIGHT: 0.308 INCHES MINIMUM AND 0.318 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS
WIDTH ACROSS FLATS0.495 INCHES MINIMUM AND 0.505 INCHES MAXIMUM IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-Z-325,TY 2,CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
THREAD SERIESUNF
HARDNESS RATING19.0 ROCKWELL C MINIMUM AND 26.0 ROCKWELL C MAXIMUM
MATERIAL DOCUMENT AND CLASSIFICATIONASTM A108 ASSN STD 1ST MATERIAL RESPONSE OR ASTM A576 ASSN STD 1ST MATERIAL RESPONSE OR QQ-S-633-CANCELED FED SPEC 2ND MATERIAL RESPONSE OR ASTM A108 ASSN STD 3RD MATERIAL RESPONSE OR QQ-S-637 FED SPEC 4TH MATERIAL RESPONSE OR QQ-S-637 FED SPEC 5TH MATERIAL RESPONSE OVERALL
THREAD DIRECTIONRIGHT-HAND
NOMINAL THREAD SIZE0.312 INCHES IN
NUT HEIGHT0.308 INCHES MINIMUM AND 0.318 INCHES MAXIMUM IN
SURFACE TREATMENTZINC OVERALL
COUNTERSINK ANGLE88.0 DEGREES MINIMUM AND 92.0 DEGREES MAXIMUM NUT
SUBSTITUTES & CROSS-REFERENCES 3
1770-251Reference document
Same NSN cross-reference
Reference document — Secondary reference
200103Reference document
Same NSN cross-reference
Reference document — Secondary reference
458708Reference 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 01770-0251?
01770-0251 is a NUT,PLAIN,SLOTTED,HEXAGON.
What parts can replace 01770-0251?
There are 3 known substitutes for 01770-0251: 1770-251, 200103, 458708. Substitute compatibility should be verified for your specific system.
What is the NSN for 01770-0251?
01770-0251 is cataloged in the U.S. Government catalog under NSN 5310-00-516-5059. 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.