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PartsTable / COMPONENT / ST33D57-1
ST33D57-1 ✓ Verified by PartsTable
— · NUT WASHER
WHAT YOU NEED TO KNOW
Match nut grade to bolt grade for full strength Lock nuts prevent loosening under vibration
Don't mix grades — weakens the joint
PRODUCT OVERVIEW

The NUT,PLAIN,RECTANGULAR is a the manufacturer industrial component. Key specifications include material: STEEL COMP 4150 OVERALL, nut_width: 0.688 INCHES NOMINAL IN, nut_height: 0.500 INCHES NOMINAL IN, nut_length: 0.875 INCHES NOMINAL IN, thread_class: 2B, thread_series: UNIFIED NATIONAL COARSE (UNC). This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-01-258-8501, 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
ST33D57-1
NSN: 5310-01-258-8501
FSC: 5310
CAGE: 04236 — LOCKHEED MARTIN CORP (USA)
SPECIFICATIONS
materialSTEEL COMP 4150 OVERALL
nut_width0.688 INCHES NOMINAL IN
nut_height0.500 INCHES NOMINAL IN
nut_length0.875 INCHES NOMINAL IN
thread_class2B
thread_seriesUNIFIED NATIONAL COARSE (UNC)
hardness_rating27.3 ROCKWELL C NOMINAL
thread_directionRIGHT-HAND
surface_treatmentOXIDE OVERALL
nominal_thread_size0.375 INCHES IN
thread_quantity_per_inch16
NSN5310-01-258-8501
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: ST33D57-1 · 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
•
NUT HEIGHT: 0.500 INCHES NOMINAL IN
•
HARDNESS RATING: 27.3 ROCKWELL C NOMINAL
•
THREAD QUANTITY PER INCH: 16
•
NOMINAL THREAD SIZE: 0.375 INCHES IN
•
THREAD SERIES: UNIFIED NATIONAL COARSE (UNC)
•
SURFACE TREATMENT: OXIDE OVERALL
•
MATERIAL: STEEL COMP 4150 OVERALL
•
THREAD DIRECTION: RIGHT-HAND
TECHNICAL CHARACTERISTICS (FLIS)
NUT HEIGHT0.500 INCHES NOMINAL IN
HARDNESS RATING27.3 ROCKWELL C NOMINAL
THREAD QUANTITY PER INCH16
NOMINAL THREAD SIZE0.375 INCHES IN
THREAD SERIESUNIFIED NATIONAL COARSE (UNC)
SURFACE TREATMENTOXIDE OVERALL
MATERIALSTEEL COMP 4150 OVERALL
THREAD DIRECTIONRIGHT-HAND
THREAD CLASS2B
NUT WIDTH0.688 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 9
11069811Interchangeable
interchangeable cross-reference
interchangeable
46512Interchangeable
interchangeable cross-reference
interchangeable
43302Interchangeable
interchangeable cross-reference
interchangeable
2495675Interchangeable
interchangeable cross-reference
interchangeable
2498657Interchangeable
interchangeable cross-reference
interchangeable
XM-36485-114-0510-O-LInterchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is ST33D57-1?
ST33D57-1 is a NUT,PLAIN,RECTANGULAR.
What parts can replace ST33D57-1?
There are 9 known substitutes for ST33D57-1: 11069811, 46512, 43302 and 6 more. Substitute compatibility should be verified for your specific system.
What is the NSN for ST33D57-1?
ST33D57-1 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-01-258-8501. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026