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Technical Data Sheet
PartsTable / COMPONENT / 51B294-4
51B294-4 ✓ 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 material: STEEL COMP 430FSE OR STEEL COMP 81B45 OR STEEL COMP 4140 OR STEEL COMP 302B OVERALL, head_style: FLAT COUNTERSUNK, grip_length: 0.240 INCHES MINIMUM AND 0.260 INCHES MAXIMUM IN, thread_class: 3A A, grip_diameter: 0.2485 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM IN, head_diameter: 0.496 INCHES MINIMUM AND 0.510 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 5305-00-107-1984, 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
51B294-4
NSN: 5305-00-107-1984
FSC: 5305
CAGE: 73197 — HI-SHEAR CORPORATION (USA)
SPECIFICATIONS
materialSTEEL COMP 430FSE OR STEEL COMP 81B45 OR STEEL COMP 4140 OR STEEL COMP 302B OVERALL
head_styleFLAT COUNTERSUNK
grip_length0.240 INCHES MINIMUM AND 0.260 INCHES MAXIMUM IN
thread_class3A A
grip_diameter0.2485 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM IN
head_diameter0.496 INCHES MINIMUM AND 0.510 INCHES MAXIMUM IN
thread_length0.254 INCHES MINIMUM AND 0.357 INCHES MAXIMUM IN
surface_finish32.0 MICROINCHES GRIP
fastener_length0.550 INCHES MINIMUM AND 0.597 INCHES MAXIMUM IN
special_featuresALUMINUM GROMMET 0.012 IN. THK ON BEARING SURFACE OF HEAD IN
thread_directionRIGHT-HAND
countersink_angle100.0 DEGREES NOMINAL
NSN5305-00-107-1984
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 51B294-4 · 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 DIAMETER: 0.496 INCHES MINIMUM AND 0.510 INCHES MAXIMUM IN
•
GRIP LENGTH: 0.240 INCHES MINIMUM AND 0.260 INCHES MAXIMUM IN
•
FASTENER LENGTH: 0.550 INCHES MINIMUM AND 0.597 INCHES MAXIMUM IN
•
COUNTERSINK ANGLE: 100.0 DEGREES NOMINAL
•
GRIP DIAMETER: 0.2485 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM IN
•
HEAD STYLE: FLAT COUNTERSUNK
•
NOMINAL THREAD DIAMETER: 0.250 INCHES IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-416 TY 2 CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
TECHNICAL CHARACTERISTICS (FLIS)
HEAD DIAMETER0.496 INCHES MINIMUM AND 0.510 INCHES MAXIMUM IN
GRIP LENGTH0.240 INCHES MINIMUM AND 0.260 INCHES MAXIMUM IN
FASTENER LENGTH0.550 INCHES MINIMUM AND 0.597 INCHES MAXIMUM IN
COUNTERSINK ANGLE100.0 DEGREES NOMINAL
GRIP DIAMETER0.2485 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM IN
HEAD STYLEFLAT COUNTERSUNK
NOMINAL THREAD DIAMETER0.250 INCHES IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-416 TY 2 CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
INTERNAL DRIVE STYLEOFFSET CRUCIFORM (TORQUE SET)
THREAD DIRECTIONRIGHT-HAND
VERIFIED SUBSTITUTES & CROSS-REFERENCES 5
150-0054Interchangeable
interchangeable cross-reference
interchangeable
BP2311Interchangeable
interchangeable cross-reference
interchangeable
1500-0054Interchangeable
interchangeable cross-reference
interchangeable
357288Interchangeable
interchangeable cross-reference
interchangeable
30B1E4501-1Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 51B294-4?
51B294-4 is a SCREW,CLOSE TOLERANCE.
What parts can replace 51B294-4?
There are 5 known substitutes for 51B294-4: 150-0054, BP2311, 1500-0054 and 2 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 51B294-4?
51B294-4 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-00-107-1984. This indicates validated use in U.S. government and defense supply chains.
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Last verified: July 2026