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Technical Data Sheet
PartsTable / COMPONENT / 8528125
8528125 ✓ 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 BOLT,RIBBED SHOULDER is a the manufacturer industrial component. Key specifications include material: STEEL COMP 1020 OVERALL, head_style: PAN NO. 2, rib_length: 0.552 INCHES MINIMUM AND 0.562 INCHES MAXIMUM IN, head_height: 0.229 INCHES MINIMUM AND 0.239 INCHES MAXIMUM IN, thread_class: 2A A, head_diameter: 0.750 INCHES NOMINAL IN.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5306-00-579-5406, 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
8528125
NSN: 5306-00-579-5406
FSC: 5306
CAGE: 18876 — US ARMY AVIATION AND MISSILE COMMAND (USA)
SPECIFICATIONS
materialSTEEL COMP 1020 OVERALL
head_stylePAN NO. 2
rib_length0.552 INCHES MINIMUM AND 0.562 INCHES MAXIMUM IN
head_height0.229 INCHES MINIMUM AND 0.239 INCHES MAXIMUM IN
thread_class2A A
head_diameter0.750 INCHES NOMINAL IN
thread_length0.844 INCHES MINIMUM AND 0.906 INCHES MAXIMUM IN
shoulder_shapeRIBBED FIRST SHOULDER
fastener_length1.719 INCHES MINIMUM AND 1.871 INCHES MAXIMUM IN
hardness_rating20.0 ROCKWELL C MINIMUM AND 24.0 ROCKWELL C MAXIMUM OVERALL
shoulder_length0.552 INCHES MINIMUM AND 0.562 INCHES MAXIMUM FIRST SHOULDER IN
thread_directionRIGHT-HAND
NSN5306-00-579-5406
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 8528125 · 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: 1.719 INCHES MINIMUM AND 1.871 INCHES MAXIMUM IN
•
HEAD DIAMETER: 0.750 INCHES NOMINAL IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-S-634 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
•
SHOULDER DIAMETER: 0.526 INCHES MINIMUM AND 0.531 INCHES MAXIMUM FIRST SHOULDER IN
•
MINIMUM TENSILE STRENGTH: 110000 POUNDS PER SQUARE INCH LBS
•
HARDNESS RATING: 20.0 ROCKWELL C MINIMUM AND 24.0 ROCKWELL C MAXIMUM OVERALL
•
DISTANCE FROM LARGEST DIAMETER OF BEARING SURFACE OF HEAD TO RIBS: 0.062 INCHES NOMINAL IN
•
RIB MAJOR DIAMETER: 0.552 INCHES MINIMUM AND 0.562 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS (FLIS)
FASTENER LENGTH1.719 INCHES MINIMUM AND 1.871 INCHES MAXIMUM IN
HEAD DIAMETER0.750 INCHES NOMINAL IN
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-S-634 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
SHOULDER DIAMETER0.526 INCHES MINIMUM AND 0.531 INCHES MAXIMUM FIRST SHOULDER IN
MINIMUM TENSILE STRENGTH110000 POUNDS PER SQUARE INCH LBS
HARDNESS RATING20.0 ROCKWELL C MINIMUM AND 24.0 ROCKWELL C MAXIMUM OVERALL
DISTANCE FROM LARGEST DIAMETER OF BEARING SURFACE OF HEAD TO RIBS0.062 INCHES NOMINAL IN
RIB MAJOR DIAMETER0.552 INCHES MINIMUM AND 0.562 INCHES MAXIMUM IN
THREAD SERIES DESIGNATORUNF
SHOULDER SHAPERIBBED FIRST SHOULDER
VERIFIED SUBSTITUTES & CROSS-REFERENCES 13
WM6.25RHNEQG2Interchangeable
interchangeable cross-reference
interchangeable
31.508Interchangeable
interchangeable cross-reference
interchangeable
GGG-F-331 TY18CL10Interchangeable
interchangeable cross-reference
interchangeable
RELEASE5306Interchangeable
interchangeable cross-reference
interchangeable
2N4126Interchangeable
interchangeable cross-reference
interchangeable
P58-005708-009Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 8528125?
8528125 is a BOLT,RIBBED SHOULDER.
What parts can replace 8528125?
There are 13 known substitutes for 8528125: WM6.25RHNEQG2, 31.508, GGG-F-331 TY18CL10 and 10 more. Substitute compatibility should be verified for your specific system.
Is 8528125 still available?
8528125 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