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MHC526 — THUMBSCREW

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

MHC526: THUMBSCREW.

The THUMBSCREW is a the manufacturer industrial component. Key specifications include material: STEEL FASTENER, head_style: STAR KNOB, head_height: 0.850 INCHES NOMINAL IN, thread_class: 2A A, thread_length: 0.750 INCHES NOMINAL IN, fastener_length: 0.690 INCHES MINIMUM AND 0.810 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5305-01-498-1978, 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
MHC526
NSN: 5305-01-498-1978
FSC: 5305 — Screws
CAGE: 0VP52 — FINCANTIERI MARINE SYSTEMS NORTH AMERICA, INC. DBA FINCANTIERI MARINE SYSTEMS NORTH AM (USA)
SPECIFICATIONS
materialSTEEL FASTENER
head_styleSTAR KNOB
head_height0.850 INCHES NOMINAL IN
thread_class2A A
thread_length0.750 INCHES NOMINAL IN
fastener_length0.690 INCHES MINIMUM AND 0.810 INCHES MAXIMUM IN
thread_directionRIGHT-HAND
width_between_flats1.375 INCHES NOMINAL IN
end_item_identificationFILTER, 12 INCH INLINE ENCLOSED AIRSEP IN
nominal_thread_diameter0.250 INCHES IN
thread_quantity_per_inch20
thread_series_designatorUNIFIED NATIONAL COARSE (UNC)
NSN5305-01-498-1978
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: MHC526 · 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 HEIGHT: 0.850 INCHES NOMINAL IN
•
FASTENER LENGTH: 0.690 INCHES MINIMUM AND 0.810 INCHES MAXIMUM IN
•
THREAD LENGTH: 0.750 INCHES NOMINAL IN
•
NOMINAL THREAD DIAMETER: 0.250 INCHES IN
•
HEAD STYLE: STAR KNOB
•
THREAD DIRECTION: RIGHT-HAND
•
WIDTH BETWEEN FLATS: 1.375 INCHES NOMINAL IN
•
THREAD CLASS: 2A A
TECHNICAL CHARACTERISTICS
HEAD HEIGHT0.850 INCHES NOMINAL IN
FASTENER LENGTH0.690 INCHES MINIMUM AND 0.810 INCHES MAXIMUM IN
THREAD LENGTH0.750 INCHES NOMINAL IN
NOMINAL THREAD DIAMETER0.250 INCHES IN
HEAD STYLESTAR KNOB
THREAD DIRECTIONRIGHT-HAND
WIDTH BETWEEN FLATS1.375 INCHES NOMINAL IN
THREAD CLASS2A A
END ITEM IDENTIFICATIONFILTER, 12 INCH INLINE ENCLOSED AIRSEP IN
THREAD QUANTITY PER INCH20
OTHER ITEMS IN FSC 5305 — Screws
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5305-00-000-0094 5305-00-000-1397 5305-00-000-2625 5305-00-000-3669 5305-00-000-3830 5305-00-000-3831
SUBSTITUTES & CROSS-REFERENCES 1
MHC531 PC 7Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is MHC526?
MHC526 is a THUMBSCREW.
What parts can replace MHC526?
There is 1 known substitute for MHC526: MHC531 PC 7. Substitute compatibility should be verified for your specific system.
What is the NSN for MHC526?
MHC526 is cataloged in the U.S. Government catalog under NSN 5305-01-498-1978. 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.