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Technical Data Sheet
PartsTable / COMPONENT / 128321
128321 ✓ Verified by PartsTable
— · BOLT SCREW
WHAT YOU NEED TO KNOW
Grade/class stamped on head determines strength Metric and imperial threads look similar — measure pitch
Verify thread pitch — metric != imperial
PRODUCT OVERVIEW

The JACK,TELEPHONE is a the manufacturer industrial component. Key specifications include shape: SPECIAL, width: 7.250 INCHES NOMINAL7.250 INCHES NOMINAL IN, length: 12.125 INCHES NOMINAL12.125 INCHES NOMINAL IN, material: STEEL, thickness: 1.000 INCHES NOMINAL1.000 INCHES NOMINAL IN, body_style: BUSHING MOUNTED LONG FRAME. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5306-00-012-8321, 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
128321
NSN: 5306-00-012-8321
FSC: 5306
CAGE: 24617 — GENERAL MOTORS CORP (USA)
SPECIFICATIONS
shapeSPECIAL
width7.250 INCHES NOMINAL7.250 INCHES NOMINAL IN
length12.125 INCHES NOMINAL12.125 INCHES NOMINAL IN
materialSTEEL
thickness1.000 INCHES NOMINAL1.000 INCHES NOMINAL IN
body_styleBUSHING MOUNTED LONG FRAME
body_width0.562 INCHES NOMINAL IN
head_styleOVAL
neck_width0.185 INCHES MINIMUM AND 0.199 INCHES MAXIMUM IN
head_height0.094 INCHES NOMINAL IN
neck_length0.094 INCHES MINIMUM AND 0.125 INCHES MAXIMUM IN
thread_class2A A
NSN5306-00-012-8321
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 128321 · OEM ⚠ VERIFY BEFORE ORDERING Verify thread pitch before ordering — metric (M8×1.25) ≠ imperial (5/16-18). Wrong thread = wrong part. Grade/class stamped on bolt head determines tensile strength ✓ BROKER TIP Grade/class stamped on head determines tensile strength. Grade 8 > Grade 5 > Grade 2. Always confirm head marking matches specification requirement PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
THREAD SERIES DESIGNATOR: UNIFIED NATIONAL COARSE (UNC)
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-S-633,CANC FED SPEC SINGLE MATERIAL RESPONSE OVERALL
•
THREAD CLASS: 2A A
•
THREAD LENGTH: 0.625 INCHES MINIMUM IN
•
NECK WIDTH: 0.185 INCHES MINIMUM AND 0.199 INCHES MAXIMUM IN
•
THREAD QUANTITY PER INCH: 24
•
HEAD DIAMETER: 0.625 INCHES NOMINAL IN
•
NOMINAL THREAD DIAMETER: 0.190 INCHES IN
TECHNICAL CHARACTERISTICS (FLIS)
THREAD SERIES DESIGNATORUNIFIED NATIONAL COARSE (UNC)
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-S-633,CANC FED SPEC SINGLE MATERIAL RESPONSE OVERALL
THREAD CLASS2A A
THREAD LENGTH0.625 INCHES MINIMUM IN
NECK WIDTH0.185 INCHES MINIMUM AND 0.199 INCHES MAXIMUM IN
THREAD QUANTITY PER INCH24
HEAD DIAMETER0.625 INCHES NOMINAL IN
NOMINAL THREAD DIAMETER0.190 INCHES IN
THREAD DIRECTIONRIGHT-HAND
FASTENER LENGTH0.875 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 4
6304301 PC 15Upgraded Successor
successor cross-reference
successor
126321Upgraded Successor
successor cross-reference
successor
128321Upgraded Successor
successor cross-reference
successor
284AInterchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 128321?
128321 is a JACK,TELEPHONE.
What parts can replace 128321?
There are 4 known substitutes for 128321: 6304301 PC 15, 126321, 128321 and 1 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 128321?
128321 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5306-00-012-8321. 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