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Technical Data Sheet
PartsTable / COMPONENT / HT239PB4-12
HT239PB4-12 ✓ Verified by PartsTable
— · BOLT SCREW
WHAT YOU NEED TO KNOW
Grade/class stamped on head determines strength Metric and imperial threads look similar — measure pitch
Verify thread pitch — metric != imperial
PRODUCT OVERVIEW

The SCREW,CLOSE TOLERANCE is a the manufacturer industrial component. Key specifications include head_style: FLAT COUNTERSUNK, grip_length: 0.740 INCHES MINIMUM AND 0.760 INCHES MAXIMUM IN, thread_class: 3A A, grip_diameter: 0.2485 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM IN, head_diameter: 0.389 INCHES MINIMUM AND 0.394 INCHES MAXIMUM IN, thread_length: 0.290 INCHES MINIMUM AND 0.357 INCHES MAXIMUM IN. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-01-043-0555, 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
HT239PB4-12
NSN: 5305-01-043-0555
FSC: 5305
CAGE: L4528 — LISI AEROSPACE CANADA CORP DIV HI SHEAR HOLDINGS INC (CAN)
SPECIFICATIONS
materialSTEEL COMP 4140 OR STEEL COMP E4340 OR STEEL COMP 6150 OR STEEL COMP 8735 OR STEEL COMP 8740 OR STEEL COMP 4130 OVERALL
head_styleFLAT COUNTERSUNK
grip_length0.740 INCHES MINIMUM AND 0.760 INCHES MAXIMUM IN
thread_class3A A
grip_diameter0.2485 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM IN
head_diameter0.389 INCHES MINIMUM AND 0.394 INCHES MAXIMUM IN
thread_length0.290 INCHES MINIMUM AND 0.357 INCHES MAXIMUM IN
fastener_length1.050 INCHES MINIMUM AND 1.097 INCHES MAXIMUM IN
hardness_rating36.0 ROCKWELL C MINIMUM AND 40.0 ROCKWELL C MAXIMUM OVERALL
thread_directionRIGHT-HAND
countersink_angle100.0 DEGREES NOMINAL
surface_treatmentCADMIUM AND CHROMATE OVERALL
NSN5305-01-043-0555
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: HT239PB4-12 · 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 TREATMENT: CADMIUM AND CHROMATE OVERALL
•
THREAD CLASS: 3A A
•
COUNTERSINK ANGLE: 100.0 DEGREES NOMINAL
•
FASTENER LENGTH: 1.050 INCHES MINIMUM AND 1.097 INCHES MAXIMUM IN
•
THREAD SERIES DESIGNATOR: UNIFIED NATIONAL JOINT FINE (UNJF)
•
HEAD STYLE: FLAT COUNTERSUNK
•
INTERNAL DRIVE STYLE: HIGH-TORQUE
•
HEAD DIAMETER: 0.389 INCHES MINIMUM AND 0.394 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS (FLIS)
SURFACE TREATMENTCADMIUM AND CHROMATE OVERALL
THREAD CLASS3A A
COUNTERSINK ANGLE100.0 DEGREES NOMINAL
FASTENER LENGTH1.050 INCHES MINIMUM AND 1.097 INCHES MAXIMUM IN
THREAD SERIES DESIGNATORUNIFIED NATIONAL JOINT FINE (UNJF)
HEAD STYLEFLAT COUNTERSUNK
INTERNAL DRIVE STYLEHIGH-TORQUE
HEAD DIAMETER0.389 INCHES MINIMUM AND 0.394 INCHES MAXIMUM IN
THREAD QUANTITY PER INCH28
NOMINAL THREAD DIAMETER0.250 INCHES IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 7
RC4156DBInterchangeable
interchangeable cross-reference
interchangeable
51-80067C01Interchangeable
interchangeable cross-reference
interchangeable
51008-0081Interchangeable
interchangeable cross-reference
interchangeable
BM19025-4-12Interchangeable
Same NIIN cross-reference
interchangeable
A147-4-12Interchangeable
Same NIIN cross-reference
interchangeable
HT8043-4-12Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is HT239PB4-12?
HT239PB4-12 is a SCREW,CLOSE TOLERANCE.
What parts can replace HT239PB4-12?
There are 7 known substitutes for HT239PB4-12: RC4156DB, 51-80067C01, 51008-0081 and 4 more. Substitute compatibility should be verified for your specific system.
What is the NSN for HT239PB4-12?
HT239PB4-12 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-01-043-0555. This indicates validated use in U.S. government and defense supply chains.
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PartsTable Design LLC · partstable.com
Last verified: July 2026