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Technical Data Sheet
PartsTable / COMPONENT / 171026
171026 ✓ 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

COVER,ENGINE POPPET VALVE ROCKER. Key specifications include tube_outside_diameter_for_which_designed: 0.625 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED 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 5305-00-017-1026, 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
171026
NSN: 5305-00-017-1026
FSC: 5305
CAGE: 7X677 — GENERAL MOTORS LLC DBA GENERAL MOTORS LLC (USA)
SPECIFICATIONS
tube_outside_diameter_for_which_designed0.625 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN
NSN5305-00-017-1026
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 171026 · 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
•
HEAD DIAMETER: 0.172 INCHES MINIMUM AND 0.190 INCHES MAXIMUM IN
•
NONMACHINE NOMINAL THREAD DIAMETER: 0.250 INCHES IN
•
NONMACHINE THREAD STYLE: DOG TYPE (TYPE B OR C)
•
MATERIAL: STEEL OVERALL
•
NONDEFINITIVE SPEC/STD DATA: C TYPE AND 10P STYLE
•
SURFACE TREATMENT: CADMIUM OR ZINC OVERALL
•
WIDTH BETWEEN FLATS: 0.367 INCHES MINIMUM AND 0.375 INCHES MAXIMUM IN
•
FASTENER LENGTH: 0.500 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
HEAD DIAMETER0.172 INCHES MINIMUM AND 0.190 INCHES MAXIMUM IN
NONMACHINE NOMINAL THREAD DIAMETER0.250 INCHES IN
NONMACHINE THREAD STYLEDOG TYPE (TYPE B OR C)
MATERIALSTEEL OVERALL
NONDEFINITIVE SPEC/STD DATAC TYPE AND 10P STYLE
SURFACE TREATMENTCADMIUM OR ZINC OVERALL
WIDTH BETWEEN FLATS0.367 INCHES MINIMUM AND 0.375 INCHES MAXIMUM IN
FASTENER LENGTH0.500 INCHES NOMINAL IN
HEAD STYLEHEXAGON
FEATURES PROVIDEDCASEHARDENED
VERIFIED SUBSTITUTES & CROSS-REFERENCES 9
FFS107TYPECSTYLE10PInterchangeable
interchangeable cross-reference
interchangeable
FFS107Interchangeable
interchangeable cross-reference
interchangeable
171121Interchangeable
interchangeable cross-reference
interchangeable
1512CSP5Interchangeable
interchangeable cross-reference
interchangeable
171026Interchangeable
interchangeable cross-reference
interchangeable
VP4871Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 171026?
171026 is a COVER,ENGINE POPPET VALVE ROCKER.
What parts can replace 171026?
There are 9 known substitutes for 171026: FFS107TYPECSTYLE10P, FFS107, 171121 and 6 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 171026?
171026 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-00-017-1026. 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