PartsTable
Technical Data Sheet
Download PDF

BLT4427 — BOLT,MACHINE

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

BLT4427: BOLT,MACHINE.

The BOLT,MACHINE is a the manufacturer industrial component. Key specifications include head_style: DOUBLE HEXAGON W/HOLE, head_height: 0.303 INCHES NOMINAL IN, thread_class: 3A A, thread_length: 0.604 INCHES NOMINAL IN, fastener_length: 1.115 INCHES NOMINAL IN, thread_direction: RIGHT-HAND. This part is cataloged in the U.S.

Government catalog under NSN 5306-01-157-8341, 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
BLT4427
NSN: 5306-01-157-8341
FSC: 5306 — Bolts
CAGE: K0378 — ROLLS-ROYCE PLC DIV DEFENSE (EUROPE) (GBR)
SPECIFICATIONS
head_styleDOUBLE HEXAGON W/HOLE
head_height0.303 INCHES NOMINAL IN
thread_class3A A
thread_length0.604 INCHES NOMINAL IN
fastener_length1.115 INCHES NOMINAL IN
thread_directionRIGHT-HAND
width_between_flats0.312 INCHES NOMINAL IN
nominal_thread_diameter0.250 INCHES IN
thread_quantity_per_inch28
thread_series_designatorUNIFIED NATIONAL JOINT FINE (UNJF)
extended_washer_thickness0.060 INCHES NOMINAL IN
criticality_code_justificationMATT
NSN5306-01-157-8341
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: BLT4427 · 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
•
EXTENDED WASHER THICKNESS: 0.060 INCHES NOMINAL IN
•
HEAD HEIGHT: 0.303 INCHES NOMINAL IN
•
FASTENER LENGTH: 1.115 INCHES NOMINAL IN
•
THREAD LENGTH: 0.604 INCHES NOMINAL IN
•
CRITICALITY CODE JUSTIFICATION: MATT
•
NOMINAL THREAD DIAMETER: 0.250 INCHES IN
•
HEAD STYLE: DOUBLE HEXAGON W/HOLE
•
THREAD DIRECTION: RIGHT-HAND
TECHNICAL CHARACTERISTICS
EXTENDED WASHER THICKNESS0.060 INCHES NOMINAL IN
HEAD HEIGHT0.303 INCHES NOMINAL IN
FASTENER LENGTH1.115 INCHES NOMINAL IN
THREAD LENGTH0.604 INCHES NOMINAL IN
CRITICALITY CODE JUSTIFICATIONMATT
NOMINAL THREAD DIAMETER0.250 INCHES IN
HEAD STYLEDOUBLE HEXAGON W/HOLE
THREAD DIRECTIONRIGHT-HAND
WIDTH BETWEEN FLATS0.312 INCHES NOMINAL IN
THREAD CLASS3A A
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
99-781-1402Reference document
Same NSN cross-reference
Reference document — Informative reference only
LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
Ready to buy BLT4427?
Compare prices from verified sellers on eBay
Buy on eBay →
As an eBay Partner, PartsTable may earn a commission. Your price is not affected.
FREQUENTLY ASKED QUESTIONS
What is BLT4427?
BLT4427 is a BOLT,MACHINE.
What parts can replace BLT4427?
There is 1 known substitute for BLT4427: 99-781-1402. Substitute compatibility should be verified for your specific system.
What is the NSN for BLT4427?
BLT4427 is cataloged in the U.S. Government catalog under NSN 5306-01-157-8341. This indicates validated use in U.S. government and defense supply chains.
Community Feedback
Leave a Comment
Comments are reviewed before appearing. You will receive an email to verify before your comment appears.

Request a Quote — BLT4427

✓ 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.