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Technical Data Sheet
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BLT4745 — BOLT,MACHINE

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

BLT4745: BOLT,MACHINE.

The BOLT,MACHINE is a the manufacturer industrial component. Key specifications include hole_type: DRILLED, head_style: DOUBLE HEXAGON W/HOLE, head_height: 0.303 INCHES NOMINAL IN, thread_class: 3A A, thread_length: 0.750 INCHES MINIMUM AND 0.810 INCHES MAXIMUM IN, surface_finish: 32.0 MICROINCHES GRIP. This part is cataloged in the U.S.

Government catalog under NSN 5306-01-166-4521, 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
BLT4745
NSN: 5306-01-166-4521
FSC: 5306 — Bolts
CAGE: K0378 — ROLLS-ROYCE PLC DIV DEFENSE (EUROPE) (GBR)
SPECIFICATIONS
hole_typeDRILLED
head_styleDOUBLE HEXAGON W/HOLE
head_height0.303 INCHES NOMINAL IN
thread_class3A A
hole_quantity4
thread_length0.750 INCHES MINIMUM AND 0.810 INCHES MAXIMUM IN
surface_finish32.0 MICROINCHES GRIP
fastener_length1.250 INCHES NOMINAL IN
thread_directionRIGHT-HAND
surface_treatmentSILVER OVERALL
width_between_flats0.312 INCHES NOMINAL IN
nominal_thread_diameter0.250 INCHES IN
NSN5306-01-166-4521
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: BLT4745 · 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 GRIP
•
EXTENDED WASHER THICKNESS: 0.060 INCHES NOMINAL IN
•
HEAD HEIGHT: 0.303 INCHES NOMINAL IN
•
FASTENER LENGTH: 1.250 INCHES NOMINAL IN
•
EXTENDED WASHER DIAMETER: 0.438 INCHES NOMINAL IN
•
THREAD LENGTH: 0.750 INCHES MINIMUM AND 0.810 INCHES MAXIMUM IN
•
HOLE CONFIGURATION STYLE: DOUBLE HEXAGON LONGITUDINAL HOLE
•
NOMINAL THREAD DIAMETER: 0.250 INCHES IN
TECHNICAL CHARACTERISTICS
SURFACE FINISH32.0 MICROINCHES GRIP
EXTENDED WASHER THICKNESS0.060 INCHES NOMINAL IN
HEAD HEIGHT0.303 INCHES NOMINAL IN
FASTENER LENGTH1.250 INCHES NOMINAL IN
EXTENDED WASHER DIAMETER0.438 INCHES NOMINAL IN
THREAD LENGTH0.750 INCHES MINIMUM AND 0.810 INCHES MAXIMUM IN
HOLE CONFIGURATION STYLEDOUBLE HEXAGON LONGITUDINAL HOLE
NOMINAL THREAD DIAMETER0.250 INCHES IN
HEAD STYLEDOUBLE HEXAGON W/HOLE
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 1
99-607-6408Reference document
Same NSN cross-reference
Reference document — Informative reference only
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 BLT4745?
BLT4745 is a BOLT,MACHINE.
What parts can replace BLT4745?
There is 1 known substitute for BLT4745: 99-607-6408. Substitute compatibility should be verified for your specific system.
What is the NSN for BLT4745?
BLT4745 is cataloged in the U.S. Government catalog under NSN 5306-01-166-4521. 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.