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PartsTable / COMPONENT / 49781-3 ITEM 4
49781-3 ITEM 4 ✓ 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. Key specifications include end_item_identification: COUPLING FLEXIBLE 6C-JNS, part_name_assigned_by_controlling_agency: (INAVY)KEY. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5315-01-543-8030, 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
49781-3 ITEM 4
NSN: 5315-01-543-8030
FSC: 5315
CAGE: 79425 — TB WOODS'S CORPORATION (USA)
SPECIFICATIONS
end_item_identificationCOUPLING FLEXIBLE 6C-JNS
part_name_assigned_by_controlling_agency(INAVY)KEY
NSN5315-01-543-8030
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 49781-3 ITEM 4 · 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
TECHNICAL CHARACTERISTICS (FLIS)
END ITEM IDENTIFICATIONCOUPLING FLEXIBLE 6C-JNS
PART NAME ASSIGNED BY CONTROLLING AGENCY(INAVY)KEY
VERIFIED SUBSTITUTES & CROSS-REFERENCES 9
K133Interchangeable
interchangeable cross-reference
interchangeable
862620Interchangeable
interchangeable cross-reference
interchangeable
352250010185Interchangeable
interchangeable cross-reference
interchangeable
014-987Interchangeable
interchangeable cross-reference
interchangeable
3331242Interchangeable
interchangeable cross-reference
interchangeable
3331242A PIECE 26Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 49781-3 ITEM 4?
49781-3 ITEM 4 is a KEY,MACHINE.
What parts can replace 49781-3 ITEM 4?
There are 9 known substitutes for 49781-3 ITEM 4: K133, 862620, 352250010185 and 6 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 49781-3 ITEM 4?
49781-3 ITEM 4 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5315-01-543-8030. 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