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Technical Data Sheet
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4B5219 — BOLT,MACHINE

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

4B5219: BOLT,MACHINE.

The BOLT,MACHINE is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, head_style: HEXAGON, head_height: 0.750 INCHES NOMINAL IN, thread_class: 2A A, thread_length: 2.125 INCHES MINIMUM IN, fastener_length: 5.500 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5306-00-423-9358, 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
4B5219
NSN: 5306-00-423-9358
FSC: 5306 — Bolts
CAGE: 11083 — CATERPILLAR INC DIV CATERPILLAR DEFENSE (USA)
SPECIFICATIONS
materialSTEEL OVERALL
head_styleHEXAGON
head_height0.750 INCHES NOMINAL IN
thread_class2A A
thread_length2.125 INCHES MINIMUM IN
fastener_length5.500 INCHES NOMINAL IN
hardness_rating30.0 ROCKWELL C NOMINAL OVERALL
thread_directionRIGHT-HAND
features_providedUNFINISHED HEAD
width_between_flats1.688 INCHES NOMINAL IN
nominal_thread_diameter1.125 INCHES IN
thread_quantity_per_inch12
NSN5306-00-423-9358
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 4B5219 · 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 HEIGHT: 0.750 INCHES NOMINAL IN
•
FASTENER LENGTH: 5.500 INCHES NOMINAL IN
•
THREAD LENGTH: 2.125 INCHES MINIMUM IN
•
HARDNESS RATING: 30.0 ROCKWELL C NOMINAL OVERALL
•
NOMINAL THREAD DIAMETER: 1.125 INCHES IN
•
FEATURES PROVIDED: UNFINISHED HEAD
•
HEAD STYLE: HEXAGON
•
THREAD DIRECTION: RIGHT-HAND
TECHNICAL CHARACTERISTICS
HEAD HEIGHT0.750 INCHES NOMINAL IN
FASTENER LENGTH5.500 INCHES NOMINAL IN
THREAD LENGTH2.125 INCHES MINIMUM IN
HARDNESS RATING30.0 ROCKWELL C NOMINAL OVERALL
NOMINAL THREAD DIAMETER1.125 INCHES IN
FEATURES PROVIDEDUNFINISHED HEAD
HEAD STYLEHEXAGON
THREAD DIRECTIONRIGHT-HAND
WIDTH BETWEEN FLATS1.688 INCHES NOMINAL IN
MINIMUM YIELD STRENGTH145000 POUNDS PER SQUARE INCH LBS
SUBSTITUTES & CROSS-REFERENCES 1
FF-S-85Reference document
Same NSN cross-reference
Reference document — Identification reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 4B5219?
4B5219 is a BOLT,MACHINE.
What parts can replace 4B5219?
There is 1 known substitute for 4B5219: FF-S-85. Substitute compatibility should be verified for your specific system.
What is the NSN for 4B5219?
4B5219 is cataloged in the U.S. Government catalog under NSN 5306-00-423-9358. 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.