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31FC1812 ✓ 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,HEXAGON is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, nut_style: HEXAGON, nut_height: 0.939 INCHES MINIMUM AND 0.999 INCHES MAXIMUM IN, thread_class: 3B, thread_series: UNF, thread_direction: RIGHT-HAND. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-01-100-0204, 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
31FC1812
NSN: 5310-01-100-0204
FSC: 5310
CAGE: 28047 — HEIN WERNER CORP (USA)
SPECIFICATIONS
materialSTEEL OVERALL
nut_styleHEXAGON
nut_height0.939 INCHES MINIMUM AND 0.999 INCHES MAXIMUM IN
thread_class3B
thread_seriesUNF
thread_directionRIGHT-HAND
width_across_flats1.631 INCHES MINIMUM AND 1.688 INCHES MAXIMUM IN
nominal_thread_size1.125 INCHES IN
bearing_surface_typeFLAT
thread_quantity_per_inch12
material_document_and_classificationHCE-545 MFR REF SINGLE MATERIAL RESPONSE OVERALL
NSN5310-01-100-0204
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 31FC1812 · 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
•
THREAD DIRECTION: RIGHT-HAND
•
THREAD SERIES: UNF
•
BEARING SURFACE TYPE: FLAT
•
NOMINAL THREAD SIZE: 1.125 INCHES IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: HCE-545 MFR REF SINGLE MATERIAL RESPONSE OVERALL
•
MATERIAL: STEEL OVERALL
•
THREAD QUANTITY PER INCH: 12
•
NUT HEIGHT: 0.939 INCHES MINIMUM AND 0.999 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS (FLIS)
THREAD DIRECTIONRIGHT-HAND
THREAD SERIESUNF
BEARING SURFACE TYPEFLAT
NOMINAL THREAD SIZE1.125 INCHES IN
MATERIAL DOCUMENT AND CLASSIFICATIONHCE-545 MFR REF SINGLE MATERIAL RESPONSE OVERALL
MATERIALSTEEL OVERALL
THREAD QUANTITY PER INCH12
NUT HEIGHT0.939 INCHES MINIMUM AND 0.999 INCHES MAXIMUM IN
WIDTH ACROSS FLATS1.631 INCHES MINIMUM AND 1.688 INCHES MAXIMUM IN
THREAD CLASS3B
VERIFIED SUBSTITUTES & CROSS-REFERENCES 2
221371Interchangeable
interchangeable cross-reference
interchangeable
2RC35Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 31FC1812?
31FC1812 is a NUT,PLAIN,HEXAGON.
What parts can replace 31FC1812?
There are 2 known substitutes for 31FC1812: 221371, 2RC35. Substitute compatibility should be verified for your specific system.
What is the NSN for 31FC1812?
31FC1812 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-01-100-0204. 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