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Technical Data Sheet
PartsTable / COMPONENT / C12596-1B
C12596-1B ✓ 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 BOLT,KEY HEAD is a the manufacturer industrial component. Key specifications include material: STEEL COMP 1035 OVERALL, head_style: FLAT COUNTERSUNK REVERSE KEYED, key_length: 0.453 INCHES NOMINAL IN, head_height: 0.514 INCHES NOMINAL IN, thread_class: 2A A, head_diameter: 1.594 INCHES NOMINAL 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 5306-00-354-3099, 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
C12596-1B
NSN: 5306-00-354-3099
FSC: 5306
CAGE: 81076 — JOHNSON C S CO INC (USA)
SPECIFICATIONS
materialSTEEL COMP 1035 OVERALL
head_styleFLAT COUNTERSUNK REVERSE KEYED
key_length0.453 INCHES NOMINAL IN
head_height0.514 INCHES NOMINAL IN
thread_class2A A
head_diameter1.594 INCHES NOMINAL IN
thread_length2.000 INCHES MINIMUM IN
fastener_length3.750 INCHES NOMINAL IN
hardness_rating15.2 ROCKWELL C MINIMUM AND 25.4 ROCKWELL C MAXIMUM OVERALL
thread_directionRIGHT-HAND
countersink_angle60.0 DEGREES NOMINAL
minimum_yield_strength75000 POUNDS PER SQUARE INCH LBS
NSN5306-00-354-3099
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: C12596-1B · 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
•
KEY LENGTH: 0.453 INCHES NOMINAL IN
•
THREAD QUANTITY PER INCH: 8
•
THREAD SERIES DESIGNATOR: UNIFIED NATIONAL COARSE (UNC)
•
MINIMUM YIELD STRENGTH: 75000 POUNDS PER SQUARE INCH LBS
•
COUNTERSINK ANGLE: 60.0 DEGREES NOMINAL
•
MATERIAL: STEEL COMP 1035 OVERALL
•
HEAD STYLE: FLAT COUNTERSUNK REVERSE KEYED
•
NOMINAL THREAD DIAMETER: 1.000 INCHES IN
TECHNICAL CHARACTERISTICS (FLIS)
KEY LENGTH0.453 INCHES NOMINAL IN
THREAD QUANTITY PER INCH8
THREAD SERIES DESIGNATORUNIFIED NATIONAL COARSE (UNC)
MINIMUM YIELD STRENGTH75000 POUNDS PER SQUARE INCH LBS
COUNTERSINK ANGLE60.0 DEGREES NOMINAL
MATERIALSTEEL COMP 1035 OVERALL
HEAD STYLEFLAT COUNTERSUNK REVERSE KEYED
NOMINAL THREAD DIAMETER1.000 INCHES IN
FASTENER LENGTH3.750 INCHES NOMINAL IN
HEAD DIAMETER1.594 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 7
4 1-2LDP1-4BM200Interchangeable
interchangeable cross-reference
interchangeable
45-1000-02L200Interchangeable
interchangeable cross-reference
interchangeable
J9054Interchangeable
interchangeable cross-reference
interchangeable
2110-0275Interchangeable
interchangeable cross-reference
interchangeable
FF340-000Interchangeable
interchangeable cross-reference
interchangeable
FFE40-000Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is C12596-1B?
C12596-1B is a BOLT,KEY HEAD.
What parts can replace C12596-1B?
There are 7 known substitutes for C12596-1B: 4 1-2LDP1-4BM200, 45-1000-02L200, J9054 and 4 more. Substitute compatibility should be verified for your specific system.
What is the NSN for C12596-1B?
C12596-1B is cataloged in the Federal Logistics Information System (FLIS) under NSN 5306-00-354-3099. 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