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Technical Data Sheet
PartsTable / COMPONENT / K1031-04
K1031-04 ✓ 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,SELF-LOCKING,PLATE is a the manufacturer industrial component. Key specifications include material: IRON ALLOY 660 OVERALL, nut_style: PLATE, nut_height: 0.143 INCHES MAXIMUM IN, nut_length: 0.948 INCHES MAXIMUM IN, plate_width: 0.195 INCHES MINIMUM AND 0.260 INCHES MAXIMUM IN, temp_rating: 800.0 FAHRENHEIT MAXIMUM DEGF. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-771-7345, 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
K1031-04
NSN: 5310-00-771-7345
FSC: 5310
CAGE: 75237 — HOWMET GLOBAL FASTENING SYSTEMS INC. DIV MICRODOT PRODUCTS (USA)
SPECIFICATIONS
materialIRON ALLOY 660 OVERALL
nut_stylePLATE
nut_height0.143 INCHES MAXIMUM IN
nut_length0.948 INCHES MAXIMUM IN
plate_width0.195 INCHES MINIMUM AND 0.260 INCHES MAXIMUM IN
temp_rating800.0 FAHRENHEIT MAXIMUM DEGF
thread_class3B
thread_seriesUNJC
hardness_rating49.0 ROCKWELL C MAXIMUM
locking_featurePREVAILING TORQUE ALL METAL DESIGN
plate_thickness0.047 INCHES MAXIMUM IN
thread_directionRIGHT-HAND
NSN5310-00-771-7345
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: K1031-04 · 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 MOUNTING PROVISION: STRAIGHT HOLES
•
MOUNTING HOLE ARRANGEMENT STYLE: 2 HOLES
•
PRECIOUS MATERIAL AND LOCATION: ALL SURFACES SILVER
•
MOUNTING HOLE DIAMETER: 0.098 INCHES MINIMUM AND 0.103 INCHES MAXIMUM IN
•
NUT HEIGHT: 0.143 INCHES MAXIMUM IN
•
NUT LENGTH: 0.948 INCHES MAXIMUM IN
•
THREAD SERIES: UNJC
•
MATERIAL DOCUMENT AND CLASSIFICATION: AMS 5525 ASSN STD SINGLE MATERIAL RESPONSE OR AMS 5732 ASSN STD SINGLE MATERIAL RESPONSE OR AMS 5737 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
TECHNICAL CHARACTERISTICS (FLIS)
NUT MOUNTING PROVISIONSTRAIGHT HOLES
MOUNTING HOLE ARRANGEMENT STYLE2 HOLES
PRECIOUS MATERIAL AND LOCATIONALL SURFACES SILVER
MOUNTING HOLE DIAMETER0.098 INCHES MINIMUM AND 0.103 INCHES MAXIMUM IN
NUT HEIGHT0.143 INCHES MAXIMUM IN
NUT LENGTH0.948 INCHES MAXIMUM IN
THREAD SERIESUNJC
MATERIAL DOCUMENT AND CLASSIFICATIONAMS 5525 ASSN STD SINGLE MATERIAL RESPONSE OR AMS 5732 ASSN STD SINGLE MATERIAL RESPONSE OR AMS 5737 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
THREAD CLASS3B
HARDNESS RATING49.0 ROCKWELL C MAXIMUM
VERIFIED SUBSTITUTES & CROSS-REFERENCES 9
127-0040Interchangeable
interchangeable cross-reference
interchangeable
12700Interchangeable
interchangeable cross-reference
interchangeable
13744Interchangeable
interchangeable cross-reference
interchangeable
938.42.68.000Interchangeable
Same NIIN cross-reference
interchangeable
R2000C04Interchangeable
Same NIIN cross-reference
interchangeable
R2000C04KInterchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is K1031-04?
K1031-04 is a NUT,SELF-LOCKING,PLATE.
What parts can replace K1031-04?
There are 9 known substitutes for K1031-04: 127-0040, 12700, 13744 and 6 more. Substitute compatibility should be verified for your specific system.
What is the NSN for K1031-04?
K1031-04 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-771-7345. 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