PartsTable
Technical Data Sheet
76771 ✓ Verified by PartsTable
Mobiparts · 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

SEAT,HELICAL COMPRESSION SPRING. Key specifications include material: STEEL, design_type: SOLID, end_diameter: 0.5630 INCHES NOMINAL IN, ridge_height: 0.0940 INCHES NOMINAL IN, bore_diameter: 0.5280 INCHES MINIMUM AND 0.5330 INCHES MAXIMUM IN, overall_height: 0.3750 INCHES NOMINAL 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 5305-00-021-4002, 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
76771
NSN: 5305-00-021-4002
FSC: 5305
CAGE: 57733 — STEWART-WARNER CORPORATION (USA)
SPECIFICATIONS
materialSTEEL
design_typeSOLID
end_diameter0.5630 INCHES NOMINAL IN
ridge_height0.0940 INCHES NOMINAL IN
bore_diameter0.5280 INCHES MINIMUM AND 0.5330 INCHES MAXIMUM IN
overall_height0.3750 INCHES NOMINAL IN
special_featuresNOT CASEHARDENED
bore_taper_in_deg7.3
first_step_diameter1.1720 INCHES NOMINAL IN
fsc_application_dataCYLINDER HEAD ASSEMBLIES,DIESEL ENGINE
distance_from_end_to_first_step0.1560 INCHES NOMINAL IN
distance_from_center_to_beginning_of_ridge0.5310 INCHES NOMINAL IN
NSN5305-00-021-4002
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 76771 · Mobiparts ⚠ 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 LENGTH: 0.750 INCHES NOMINAL IN
NOMINAL THREAD DIAMETER: 0.250 INCHES IN
HARDNESS RATING: 100.0 ROCKWELL B MAXIMUM OVERALL
MATERIAL: STEEL OVERALL
THREAD SERIES DESIGNATOR: UNIFIED NATIONAL COARSE (UNC)
THREAD QUANTITY PER INCH: 20
THREAD DIRECTION: RIGHT-HAND
SURFACE TREATMENT: CADMIUM OVERALL
TECHNICAL CHARACTERISTICS (FLIS)
THREAD LENGTH0.750 INCHES NOMINAL IN
NOMINAL THREAD DIAMETER0.250 INCHES IN
HARDNESS RATING100.0 ROCKWELL B MAXIMUM OVERALL
MATERIALSTEEL OVERALL
THREAD SERIES DESIGNATORUNIFIED NATIONAL COARSE (UNC)
THREAD QUANTITY PER INCH20
THREAD DIRECTIONRIGHT-HAND
SURFACE TREATMENTCADMIUM OVERALL
HEAD STYLEHEXAGON
THREAD CLASS2A A
VERIFIED SUBSTITUTES & CROSS-REFERENCES 11
76771Interchangeable
interchangeable cross-reference
interchangeable
913-6Interchangeable
interchangeable cross-reference
interchangeable
SP502Interchangeable
interchangeable cross-reference
interchangeable
SP502ASInterchangeable
interchangeable cross-reference
interchangeable
1089066Interchangeable
interchangeable cross-reference
interchangeable
21-400-2Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 76771?
76771 is a SEAT,HELICAL COMPRESSION SPRING manufactured by Mobiparts.
What parts can replace 76771?
There are 11 known substitutes for 76771: 76771, 913-6, SP502 and 8 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 76771?
76771 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-00-021-4002. This indicates validated use in U.S. government and defense supply chains.
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