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Technical Data Sheet
PartsTable / COMPONENT / 189303
189303 ✓ 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

CONNECTOR,RECEPTACLE,ELECTRICAL. Key specifications include material: STEEL OVERALL, body_style: STRAIGHT SHAPE, head_style: HEXAGON, shell_type: SOLID, head_height: 0.226 INCHES MINIMUM AND 0.243 INCHES MAXIMUM IN, thread_class: 2A A. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-00-018-9303, 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
189303
NSN: 5305-00-018-9303
FSC: 5305
CAGE: 7X677 — GENERAL MOTORS LLC DBA GENERAL MOTORS LLC (USA)
SPECIFICATIONS
materialSTEEL OVERALL
body_styleSTRAIGHT SHAPE
head_styleHEXAGON
shell_typeSOLID
head_height0.226 INCHES MINIMUM AND 0.243 INCHES MAXIMUM IN
thread_class2A A
overall_width1.750 INCHES NOMINAL IN
terminal_typeTAB, SOLDER LUG SINGLE MATING END SINGLE CONTACT GROUPING
thread_length1.000 INCHES MINIMUM AND 1.188 INCHES MAXIMUM IN
overall_height1.125 INCHES NOMINAL IN
overall_length2.312 INCHES NOMINAL IN
shell_materialCOPPER ALLOY
NSN5305-00-018-9303
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 189303 · 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 QUANTITY PER INCH: 16
•
THREAD DIRECTION: RIGHT-HAND
•
THREAD CLASS: 2A A
•
HARDNESS RATING: 23.0 ROCKWELL C MINIMUM AND 30.0 ROCKWELL C MAXIMUM OVERALL
•
MATERIAL DOCUMENT AND CLASSIFICATION: SAE GR 5 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
•
MINIMUM YIELD STRENGTH: 85000 POUNDS PER SQUARE INCH LBS
•
MATERIAL: STEEL OVERALL
•
HEAD STYLE: HEXAGON
TECHNICAL CHARACTERISTICS (FLIS)
THREAD QUANTITY PER INCH16
THREAD DIRECTIONRIGHT-HAND
THREAD CLASS2A A
HARDNESS RATING23.0 ROCKWELL C MINIMUM AND 30.0 ROCKWELL C MAXIMUM OVERALL
MATERIAL DOCUMENT AND CLASSIFICATIONSAE GR 5 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
MINIMUM YIELD STRENGTH85000 POUNDS PER SQUARE INCH LBS
MATERIALSTEEL OVERALL
HEAD STYLEHEXAGON
SURFACE TREATMENTCADMIUM OR ZINC OVERALL
HEAD HEIGHT0.226 INCHES MINIMUM AND 0.243 INCHES MAXIMUM IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 5
L79-5055-1Interchangeable
interchangeable cross-reference
interchangeable
SM-B-427465Interchangeable
interchangeable cross-reference
interchangeable
189303Interchangeable
interchangeable cross-reference
interchangeable
FFS85TYPE2STYLE10PGRADE5Interchangeable
Same NIIN cross-reference
interchangeable
3-8 16THDX3 1-8INInterchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 189303?
189303 is a CONNECTOR,RECEPTACLE,ELECTRICAL.
What parts can replace 189303?
There are 5 known substitutes for 189303: L79-5055-1, SM-B-427465, 189303 and 2 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 189303?
189303 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-00-018-9303. 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