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4210839 — THUMBSCREW

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

4210839: THUMBSCREW.

The THUMBSCREW is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, head_style: THUMB NO. 1, head_height: 0.380 INCHES NOMINAL IN, thread_class: 2B, thread_length: 2.000 INCHES NOMINAL IN, fastener_length: 5.310 INCHES NOMINAL IN.

This part is cataloged in the U.S. Government catalog under NSN 5305-01-357-9346, 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
4210839
NSN: 5305-01-357-9346
FSC: 5305 — Screws
CAGE: 80212 — BAE SYSTEMS LAND & ARMAMENTS L.P. (USA)
SPECIFICATIONS
materialSTEEL OVERALL
head_styleTHUMB NO. 1
head_height0.380 INCHES NOMINAL IN
thread_class2B
thread_length2.000 INCHES NOMINAL IN
fastener_length5.310 INCHES NOMINAL IN
thread_directionRIGHT-HAND
surface_treatmentCADMIUM OVERALL
width_between_flats0.510 INCHES NOMINAL IN
nominal_thread_diameter0.312 INCHES IN
thread_quantity_per_inch18
thread_series_designatorUNIFIED NATIONAL COARSE (UNC)
NSN5305-01-357-9346
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 4210839 · 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: 0.380 INCHES NOMINAL IN
•
FASTENER LENGTH: 5.310 INCHES NOMINAL IN
•
THREAD LENGTH: 2.000 INCHES NOMINAL IN
•
NOMINAL THREAD DIAMETER: 0.312 INCHES IN
•
HEAD STYLE: THUMB NO. 1
•
THREAD DIRECTION: RIGHT-HAND
•
SPECIFICATION/STANDARD DATA: 80212-4210839 PROFESSIONAL/INDUSTRIAL ASSOCIATION SPECIFICATION
•
WIDTH BETWEEN FLATS: 0.510 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
HEAD HEIGHT0.380 INCHES NOMINAL IN
FASTENER LENGTH5.310 INCHES NOMINAL IN
THREAD LENGTH2.000 INCHES NOMINAL IN
NOMINAL THREAD DIAMETER0.312 INCHES IN
HEAD STYLETHUMB NO. 1
THREAD DIRECTIONRIGHT-HAND
SPECIFICATION/STANDARD DATA80212-4210839 PROFESSIONAL/INDUSTRIAL ASSOCIATION SPECIFICATION
WIDTH BETWEEN FLATS0.510 INCHES NOMINAL IN
SURFACE TREATMENTCADMIUM OVERALL
THREAD CLASS2B
OTHER ITEMS IN FSC 5305 — Screws
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5305-00-001-5016 5305-00-001-9160 5305-00-001-9629 5305-00-001-9742 5305-00-001-9768 5305-00-003-4306 5305-00-003-6694 5305-00-003-6753
SUBSTITUTES & CROSS-REFERENCES 1
SNRG.765.0612.001Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 4210839?
4210839 is a THUMBSCREW.
What parts can replace 4210839?
There is 1 known substitute for 4210839: SNRG.765.0612.001. Substitute compatibility should be verified for your specific system.
What is the NSN for 4210839?
4210839 is cataloged in the U.S. Government catalog under NSN 5305-01-357-9346. 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.