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Technical Data Sheet
PartsTable / COMPONENT / 129303-1
129303-1 ✓ 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 INSULATOR,PLATE is a the manufacturer industrial component. Key specifications include material: GLASS FIBER AND PLASTIC EPOXY OVERALL, head_style: KNURLED NO. 6, head_height: 0.624 INCHES MINIMUM AND 0.638 INCHES MAXIMUM IN, point_style: CONE, thread_class: 2A A, head_diameter: 0.175 INCHES MINIMUM AND 0.177 INCHES MAXIMUM 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 5305-01-294-6344, 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
129303-1
NSN: 5305-01-294-6344
FSC: 5305
CAGE: 94271 — LOCKHEED MARTIN CORP (USA)
SPECIFICATIONS
materialGLASS FIBER AND PLASTIC EPOXY OVERALL
head_styleKNURLED NO. 6
head_height0.624 INCHES MINIMUM AND 0.638 INCHES MAXIMUM IN
point_styleCONE
thread_class2A A
head_diameter0.175 INCHES MINIMUM AND 0.177 INCHES MAXIMUM IN
overall_width0.500 INCHES NOMINAL IN
thread_length0.452 INCHES MINIMUM AND 0.466 INCHES MAXIMUM IN
overall_height0.010 INCHES NOMINAL IN
overall_length1.000 INCHES NOMINAL IN
fastener_length0.452 INCHES MINIMUM AND 0.466 INCHES MAXIMUM IN
special_featuresROLLED THREAD
NSN5305-01-294-6344
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 129303-1 · 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 CLASS: 2A A
•
FASTENER LENGTH: 1.090 INCHES NOMINAL IN
•
THREAD QUANTITY PER INCH: 28
•
REFERENCE NUMBER DIFFERENTIATING CHARACTERISTICS: AS DIFFERENTIATED BY MATERIAL WHICH MUST CONFORM TO SHIPS PARTS CONTROL CENTER SPECIAL QUALITY CONTROL PROVISIONS
•
HEAD HEIGHT: 0.591 INCHES NOMINAL IN
•
THREAD LENGTH: 0.452 INCHES MINIMUM AND 0.466 INCHES MAXIMUM IN
•
HEAD STYLE: KNURLED NO. 6
TECHNICAL CHARACTERISTICS (FLIS)
THREAD CLASS2A A
FASTENER LENGTH1.090 INCHES NOMINAL IN
THREAD QUANTITY PER INCH28
REFERENCE NUMBER DIFFERENTIATING CHARACTERISTICSAS DIFFERENTIATED BY MATERIAL WHICH MUST CONFORM TO SHIPS PARTS CONTROL CENTER SPECIAL QUALITY CONTROL PROVISIONS
HEAD HEIGHT0.591 INCHES NOMINAL IN
SPECIAL FEATURESROLLED THREAD
THREAD LENGTH0.452 INCHES MINIMUM AND 0.466 INCHES MAXIMUM IN
HEAD STYLEKNURLED NO. 6
CRITICALITY CODE JUSTIFICATIONZZZY
SURFACE TREATMENTPASSIVATE OVERALL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 3
129303-1Interchangeable
interchangeable cross-reference
interchangeable
LL-HQ5-9137Interchangeable
interchangeable cross-reference
interchangeable
129303Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 129303-1?
129303-1 is a INSULATOR,PLATE.
What parts can replace 129303-1?
There are 3 known substitutes for 129303-1: 129303-1, LL-HQ5-9137, 129303. Substitute compatibility should be verified for your specific system.
What is the NSN for 129303-1?
129303-1 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-01-294-6344. 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