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Technical Data Sheet
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MS9566-04 — BOLT,MACHINE

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

MS9566-04: BOLT,MACHINE.

The BOLT,MACHINE is a the manufacturer industrial component. Key specifications include material: IRON ALLOY 660 OVERALL, hole_type: DRILLED, head_style: DOUBLE HEXAGON W/HOLE, grip_length: 0.079 INCHES MINIMUM AND 0.099 INCHES MAXIMUM IN, head_height: 0.300 INCHES NOMINAL IN, thread_class: 3A A. This part is cataloged in the U.S.

Government catalog under NSN 5306-00-143-1541, 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
MS9566-04
NSN: 5306-00-143-1541
FSC: 5306 — Bolts
CAGE: 0U583 — SAE INTERNATIONAL DBA SAE INTERNATIONAL (USA)
SPECIFICATIONS
materialIRON ALLOY 660 OVERALL
hole_typeDRILLED
head_styleDOUBLE HEXAGON W/HOLE
grip_length0.079 INCHES MINIMUM AND 0.099 INCHES MAXIMUM IN
head_height0.300 INCHES NOMINAL IN
thread_class3A A
hole_diameter0.070 INCHES NOMINAL IN
hole_quantity4
thread_length0.276 INCHES MINIMUM AND 0.296 INCHES MAXIMUM IN
surface_finish32.0 MICROINCHES GRIP
fastener_length0.375 INCHES NOMINAL IN
hardness_rating248.0 BRINELL STANDARD MINIMUM AND 341.0 BRINELL STANDARD MAXIMUM OVERALL
NSN5306-00-143-1541
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: MS9566-04 · 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
•
SURFACE FINISH: 32.0 MICROINCHES THREADS
•
EXTENDED WASHER THICKNESS: 0.060 INCHES MINIMUM AND 0.070 INCHES MAXIMUM IN
•
HEAD HEIGHT: 0.300 INCHES NOMINAL IN
•
FASTENER LENGTH: 0.375 INCHES NOMINAL IN
•
EXTENDED WASHER DIAMETER: 0.438 INCHES NOMINAL IN
•
THREAD LENGTH: 0.276 INCHES MINIMUM AND 0.296 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS
SURFACE FINISH32.0 MICROINCHES THREADS
SURFACE FINISH32.0 MICROINCHES GRIP
SURFACE FINISH32.0 MICROINCHES BEARING SURFACE OF HEAD
EXTENDED WASHER THICKNESS0.060 INCHES MINIMUM AND 0.070 INCHES MAXIMUM IN
HEAD HEIGHT0.300 INCHES NOMINAL IN
FASTENER LENGTH0.375 INCHES NOMINAL IN
EXTENDED WASHER DIAMETER0.438 INCHES NOMINAL IN
THREAD LENGTH0.276 INCHES MINIMUM AND 0.296 INCHES MAXIMUM IN
HARDNESS RATING248.0 BRINELL STANDARD MINIMUM AND 341.0 BRINELL STANDARD MAXIMUM OVERALL
HOLE CONFIGURATION STYLEDOUBLE HEXAGON LONGITUDINAL HOLE
SUBSTITUTES & CROSS-REFERENCES 2
674146Reference document
Same NSN cross-reference
Reference document — Replaced / superseded reference
SAE AS9566Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusCancelled· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is MS9566-04?
MS9566-04 is a BOLT,MACHINE.
What parts can replace MS9566-04?
There are 2 known substitutes for MS9566-04: 674146, SAE AS9566. Substitute compatibility should be verified for your specific system.
What is the NSN for MS9566-04?
MS9566-04 is cataloged in the U.S. Government catalog under NSN 5306-00-143-1541. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.