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Technical Data Sheet
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15977 ✓ 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 UNDERWATER LOCATOR TEST SET is a the manufacturer industrial component. Key specifications include end_item_identification: CN-235 TRANSPORT AIRCRAFT, part_name_assigned_by_controlling_agency: BRACKET,MOUNTING. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-485-4229, 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
15977
NSN: 5310-00-485-4229
FSC: 5310
CAGE: 0KDP7 — KIDDE-FENWAL, LLC (USA)
SPECIFICATIONS
end_item_identificationCN-235 TRANSPORT AIRCRAFT
part_name_assigned_by_controlling_agencyBRACKET,MOUNTING
NSN5310-00-485-4229
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 15977 · 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
250-16273 ITEM 10Interchangeable
interchangeable cross-reference
interchangeable
15977Interchangeable
interchangeable cross-reference
interchangeable
MC266F10Interchangeable
interchangeable cross-reference
interchangeable
3780 SInterchangeable
interchangeable cross-reference
interchangeable
C15977Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 15977?
15977 is a UNDERWATER LOCATOR TEST SET.
What parts can replace 15977?
There are 5 known substitutes for 15977: 250-16273 ITEM 10, 15977, MC266F10 and 2 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 15977?
15977 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-485-4229. 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