PartsTable
Technical Data Sheet
321786-1 ✓ 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

SOCKET,PLUG-IN ELECTRONIC COMPON. Key specifications include material: COPPER ALLOY CONTACT, body_style: TOP MOUNT W/STUDS, thread_class: 2A A, overall_width: 0.390 INCHES NOMINAL IN, thread_length: 0.625 INCHES NOMINAL IN, overall_height: 0.699 INCHES NOMINAL 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 5315-00-038-0809, 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
321786-1
NSN: 5315-00-038-0809
FSC: 5315
CAGE: 55380 — HATCH & KIRK, INC. (USA)
SPECIFICATIONS
materialCOPPER ALLOY CONTACT
body_styleTOP MOUNT W/STUDS
thread_class2A A
overall_width0.390 INCHES NOMINAL IN
thread_length0.625 INCHES NOMINAL IN
overall_height0.699 INCHES NOMINAL IN
overall_length1.344 INCHES NOMINAL IN
first_end_styleSQUARE
mounting_methodTHREADED STUD(S)
pin_grip_length1.125 INCHES NOMINAL IN
thread_directionRIGHT-HAND
precious_materialGOLD AND SILVER
NSN5315-00-038-0809
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 321786-1 · 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
PIN OVERALL DIAMETER: 0.4995 INCHES MINIMUM AND 0.5000 INCHES MAXIMUM IN
SECOND END RELATIONSHIP WITH FIRST END: IDENTICAL
THREAD DIRECTION: RIGHT-HAND
THREAD SERIES DESIGNATOR: UNF
FIRST END LOCATION: SHANK END
THREAD QUANTITY PER INCH: 24
THREAD LENGTH: 0.625 INCHES NOMINAL IN
FIRST END STYLE: SQUARE
TECHNICAL CHARACTERISTICS (FLIS)
PIN OVERALL DIAMETER0.4995 INCHES MINIMUM AND 0.5000 INCHES MAXIMUM IN
SECOND END RELATIONSHIP WITH FIRST ENDIDENTICAL
THREAD DIRECTIONRIGHT-HAND
THREAD SERIES DESIGNATORUNF
FIRST END LOCATIONSHANK END
THREAD QUANTITY PER INCH24
THREAD LENGTH0.625 INCHES NOMINAL IN
FIRST END STYLESQUARE
PIN GRIP LENGTH1.125 INCHES NOMINAL IN
THREAD CLASS3A A
VERIFIED SUBSTITUTES & CROSS-REFERENCES 4
321786-1Interchangeable
interchangeable cross-reference
interchangeable
HRC34JInterchangeable
interchangeable cross-reference
interchangeable
HRC34Interchangeable
interchangeable cross-reference
interchangeable
3277861Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 321786-1?
321786-1 is a SOCKET,PLUG-IN ELECTRONIC COMPON.
What parts can replace 321786-1?
There are 4 known substitutes for 321786-1: 321786-1, HRC34J, HRC34 and 1 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 321786-1?
321786-1 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5315-00-038-0809. This indicates validated use in U.S. government and defense supply chains.
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