PartsTable
Technical Data Sheet
FORM5S1878FIG9REF31 ✓ 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 KEY,MACHINE is a the manufacturer industrial component. This product is currently in active production with full OEM support. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5315-01-426-7108, 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
FORM5S1878FIG9REF31
NSN: 5315-01-426-7108
FSC: 5315
CAGE: 25795 — W.W. GRAINGER, INC. DIV GOVERNMENT SALES DIVISION (USA)
SPECIFICATIONS
Part NumberFORM5S1878FIG9REF31
NSN5315-01-426-7108
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: FORM5S1878FIG9REF31 · 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
VERIFIED SUBSTITUTES & CROSS-REFERENCES 5
140-066Interchangeable
interchangeable cross-reference
interchangeable
MAN004AInterchangeable
interchangeable cross-reference
interchangeable
HS-05Interchangeable
interchangeable cross-reference
interchangeable
KS-07Interchangeable
interchangeable cross-reference
interchangeable
140.066Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is FORM5S1878FIG9REF31?
FORM5S1878FIG9REF31 is a KEY,MACHINE.
What parts can replace FORM5S1878FIG9REF31?
There are 5 known substitutes for FORM5S1878FIG9REF31: 140-066, MAN004A, HS-05 and 2 more. Substitute compatibility should be verified for your specific system.
What is the NSN for FORM5S1878FIG9REF31?
FORM5S1878FIG9REF31 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5315-01-426-7108. This indicates validated use in U.S. government and defense supply chains.
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