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ST52603 — BOLT,MACHINE

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

ST52603: BOLT,MACHINE.

The BOLT,MACHINE is a the manufacturer industrial component. Key specifications include head_style: DISHED HEXAGON, head_height: 0.250 INCHES MINIMUM AND 0.260 INCHES MAXIMUM IN, thread_class: 2A A, thread_length: 0.814 INCHES MINIMUM AND 1.000 INCHES MAXIMUM IN, fastener_length: 0.970 INCHES MINIMUM AND 1.000 INCHES MAXIMUM IN, hardness_rating: 32.0 ROCKWELL C MINIMUM AND 38.0 ROCKWELL C MAXIMUM OVERALL. This part is cataloged in the U.S.

Government catalog under NSN 5306-01-066-3529, 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
ST52603
NSN: 5306-01-066-3529
FSC: 5306 — Bolts
CAGE: K2709 — PERKINS ENGINES COMPANY LTD (GBR)
SPECIFICATIONS
head_styleDISHED HEXAGON
head_height0.250 INCHES MINIMUM AND 0.260 INCHES MAXIMUM IN
thread_class2A A
thread_length0.814 INCHES MINIMUM AND 1.000 INCHES MAXIMUM IN
fastener_length0.970 INCHES MINIMUM AND 1.000 INCHES MAXIMUM IN
hardness_rating32.0 ROCKWELL C MINIMUM AND 38.0 ROCKWELL C MAXIMUM OVERALL
locking_featureDISTORTIONS TOP OF HEAD
thread_directionRIGHT-HAND
features_providedFINISHED HEAD
surface_treatmentPHOSPHATE OVERALL
width_between_flats0.551 INCHES MINIMUM AND 0.562 INCHES MAXIMUM IN
nominal_thread_diameter0.375 INCHES IN
NSN5306-01-066-3529
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: ST52603 · 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: 0.250 INCHES MINIMUM AND 0.260 INCHES MAXIMUM IN
•
FASTENER LENGTH: 0.970 INCHES MINIMUM AND 1.000 INCHES MAXIMUM IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: MIL-P-16232 TYZCL2 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL
•
THREAD LENGTH: 0.814 INCHES MINIMUM AND 1.000 INCHES MAXIMUM IN
•
HARDNESS RATING: 32.0 ROCKWELL C MINIMUM AND 38.0 ROCKWELL C MAXIMUM OVERALL
•
MATERIAL DOCUMENT AND CLASSIFICATION: SAEJ429 GR8 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
•
NOMINAL THREAD DIAMETER: 0.375 INCHES IN
•
FEATURES PROVIDED: FINISHED HEAD
TECHNICAL CHARACTERISTICS
HEAD HEIGHT0.250 INCHES MINIMUM AND 0.260 INCHES MAXIMUM IN
FASTENER LENGTH0.970 INCHES MINIMUM AND 1.000 INCHES MAXIMUM IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONMIL-P-16232 TYZCL2 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL
THREAD LENGTH0.814 INCHES MINIMUM AND 1.000 INCHES MAXIMUM IN
HARDNESS RATING32.0 ROCKWELL C MINIMUM AND 38.0 ROCKWELL C MAXIMUM OVERALL
MATERIAL DOCUMENT AND CLASSIFICATIONSAEJ429 GR8 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
NOMINAL THREAD DIAMETER0.375 INCHES IN
FEATURES PROVIDEDFINISHED HEAD
HEAD STYLEDISHED HEXAGON
THREAD DIRECTIONRIGHT-HAND
OTHER ITEMS IN FSC 5306 — Bolts
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5306-00-001-1276 5306-00-001-1949 5306-00-001-1988 5306-00-001-1989 5306-00-001-1990 5306-00-001-1991 5306-00-001-1993 5306-00-001-2017
SUBSTITUTES & CROSS-REFERENCES 3
62.90.013Reference document
Same NSN cross-reference
Reference document — Secondary reference
5306010663529Reference document
Same NSN cross-reference
Reference document — Informative reference only
MS35764-233Same 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 ST52603?
ST52603 is a BOLT,MACHINE.
What parts can replace ST52603?
There are 3 known substitutes for ST52603: 62.90.013, 5306010663529, MS35764-233. Substitute compatibility should be verified for your specific system.
What is the NSN for ST52603?
ST52603 is cataloged in the U.S. Government catalog under NSN 5306-01-066-3529. 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.