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Technical Data Sheet
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BT45 — BOLT,SQUARE NECK

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

BT45: BOLT,SQUARE NECK.

The BOLT,SQUARE NECK is a the manufacturer industrial component. Key specifications include material: STEEL COMP 1035 OVERALL, head_style: BUTTON, neck_width: 0.625 INCHES NOMINAL IN, head_height: 0.375 INCHES NOMINAL IN, neck_length: 0.250 INCHES NOMINAL IN, thread_class: 3A A. This part is cataloged in the U.S.

Government catalog under NSN 5306-00-426-7314, 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
BT45
NSN: 5306-00-426-7314
FSC: 5306 — Bolts
CAGE: 73195 — ACCURIDE CORPORATION DBA ACCURIDE DISTRIBUTING LLC (USA)
SPECIFICATIONS
materialSTEEL COMP 1035 OVERALL
head_styleBUTTON
neck_width0.625 INCHES NOMINAL IN
head_height0.375 INCHES NOMINAL IN
neck_length0.250 INCHES NOMINAL IN
thread_class3A A
head_diameter1.250 INCHES NOMINAL IN
thread_length1.125 INCHES MINIMUM IN
fastener_length2.750 INCHES NOMINAL IN
thread_directionRIGHT-HAND
surface_treatmentZINC AND CADMIUM OVERALL
nominal_thread_diameter0.625 INCHES IN
NSN5306-00-426-7314
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: BT45 · 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
•
NECK LENGTH: 0.250 INCHES NOMINAL IN
•
HEAD HEIGHT: 0.375 INCHES NOMINAL IN
•
FASTENER LENGTH: 2.750 INCHES NOMINAL IN
•
THREAD LENGTH: 1.125 INCHES MINIMUM IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: SAE ASSN STD SINGLE MATERIAL RESPONSE OVERALL
•
NOMINAL THREAD DIAMETER: 0.625 INCHES IN
•
HEAD STYLE: BUTTON
•
THREAD DIRECTION: RIGHT-HAND
TECHNICAL CHARACTERISTICS
NECK LENGTH0.250 INCHES NOMINAL IN
HEAD HEIGHT0.375 INCHES NOMINAL IN
FASTENER LENGTH2.750 INCHES NOMINAL IN
THREAD LENGTH1.125 INCHES MINIMUM IN
MATERIAL DOCUMENT AND CLASSIFICATIONSAE ASSN STD SINGLE MATERIAL RESPONSE OVERALL
NOMINAL THREAD DIAMETER0.625 INCHES IN
HEAD STYLEBUTTON
THREAD DIRECTIONRIGHT-HAND
NECK WIDTH0.625 INCHES NOMINAL IN
SURFACE TREATMENTZINC AND CADMIUM OVERALL
SUBSTITUTES & CROSS-REFERENCES 1
R10789Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is BT45?
BT45 is a BOLT,SQUARE NECK.
What parts can replace BT45?
There is 1 known substitute for BT45: R10789. Substitute compatibility should be verified for your specific system.
What is the NSN for BT45?
BT45 is cataloged in the U.S. Government catalog under NSN 5306-00-426-7314. 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.