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Technical Data Sheet
PartsTable / COMPONENT / 261A
261A ✓ 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 SIAMESE CONNECTION,FIRE HOSE is a the manufacturer industrial component. Key specifications include material: COPPER ALLOY BODY, thread_class: 2B ALL ENDS, connection_type: THREADED INTERNAL BOSS FIRST FLUID END CONNECTION, connection_style: BOSS GASKET SEAL ALL ENDS, style_designator: MALE COUPLING HALF, nominal_thread_size: 1.312 INCHES ALL ENDS IN. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5315-00-128-1210, 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
261A
NSN: 5315-00-128-1210
FSC: 5315
CAGE: 72328 — COTTA TRANSMISSION CO LLC (USA)
SPECIFICATIONS
materialCOPPER ALLOY BODY
thread_class2B ALL ENDS
connection_typeTHREADED INTERNAL BOSS FIRST FLUID END CONNECTION
connection_styleBOSS GASKET SEAL ALL ENDS
style_designatorMALE COUPLING HALF
nominal_thread_size1.312 INCHES ALL ENDS IN
thread_quantity_per_inch12 ALL ENDS
thread_series_designatorUN ALL ENDS
NSN5315-00-128-1210
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 261A · 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 IDENTIFICATION2210008205451
VERIFIED SUBSTITUTES & CROSS-REFERENCES 9
756AInterchangeable
interchangeable cross-reference
interchangeable
261AInterchangeable
interchangeable cross-reference
interchangeable
7-61004Interchangeable
interchangeable cross-reference
interchangeable
SIAMESEC0NNECTI0NInterchangeable
interchangeable cross-reference
interchangeable
02620005Interchangeable
interchangeable cross-reference
interchangeable
845-2445071ITEM11Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 261A?
261A is a SIAMESE CONNECTION,FIRE HOSE.
What parts can replace 261A?
There are 9 known substitutes for 261A: 756A, 261A, 7-61004 and 6 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 261A?
261A is cataloged in the Federal Logistics Information System (FLIS) under NSN 5315-00-128-1210. 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