PartsTable
Technical Data Sheet
PartsTable / COMPONENT / 66638-1
66638-1 ✓ 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 COVER,SEAT,VEHICULAR is a the manufacturer industrial component. Key specifications include design_type: SEAT BACK, end_item_identification: WAYNE TRANSPORTATION SCHOOL BUS MODEL 1973 TO 1984. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-00-145-0230, 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
66638-1
NSN: 5305-00-145-0230
FSC: 5305
CAGE: 58275 — SASCO INC CANADIAN DIV
SPECIFICATIONS
design_typeSEAT BACK
end_item_identificationWAYNE TRANSPORTATION SCHOOL BUS MODEL 1973 TO 1984
NSN5305-00-145-0230
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 66638-1 · 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
•
FASTENER LENGTH: 0.297 INCHES MINIMUM AND 0.327 INCHES MAXIMUM IN
•
THREAD SERIES DESIGNATOR: UNIFIED NATIONAL COARSE (UNC)
•
PRIMARY WASHER MATERIAL THICKNESS: 0.031 INCHES MINIMUM AND 0.041 INCHES MAXIMUM IN
•
INTERNAL DRIVE STYLE: SLOT
•
WASHER QUANTITY: 1
•
HEAD HEIGHT: 0.126 INCHES MINIMUM AND 0.156 INCHES MAXIMUM IN
•
THREAD CLASS: 2A A
•
THREAD QUANTITY PER INCH: 32
TECHNICAL CHARACTERISTICS (FLIS)
FASTENER LENGTH0.297 INCHES MINIMUM AND 0.327 INCHES MAXIMUM IN
THREAD SERIES DESIGNATORUNIFIED NATIONAL COARSE (UNC)
PRIMARY WASHER MATERIAL THICKNESS0.031 INCHES MINIMUM AND 0.041 INCHES MAXIMUM IN
INTERNAL DRIVE STYLESLOT
WASHER QUANTITY1
HEAD HEIGHT0.126 INCHES MINIMUM AND 0.156 INCHES MAXIMUM IN
THREAD CLASS2A A
THREAD QUANTITY PER INCH32
PRIMARY WASHER OUTSIDE DIAMETER0.257 INCHES MAXIMUM IN
NOMINAL THREAD DIAMETER0.164 INCHES IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 19
5503TInterchangeable
interchangeable cross-reference
interchangeable
917256Interchangeable
interchangeable cross-reference
interchangeable
504484Interchangeable
interchangeable cross-reference
interchangeable
HG272DInterchangeable
interchangeable cross-reference
interchangeable
71047 C1Interchangeable
interchangeable cross-reference
interchangeable
HG150DInterchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 66638-1?
66638-1 is a COVER,SEAT,VEHICULAR.
What parts can replace 66638-1?
There are 19 known substitutes for 66638-1: 5503T, 917256, 504484 and 16 more. Substitute compatibility should be verified for your specific system.
Is 66638-1 still available?
66638-1 is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026