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279481 — THUMBSCREW

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

279481: THUMBSCREW.

The THUMBSCREW is a the manufacturer industrial component. Key specifications include material: STEEL COMP 303 OVERALL, hole_type: DRILLED, head_style: KNURLED NO. 4, head_height: 0.250 INCHES NOMINAL IN, point_style: CONECONE, thread_class: 2A A.

This part is cataloged in the U.S. Government catalog under NSN 5305-00-481-0683, 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
279481
NSN: 5305-00-481-0683
FSC: 5305 — Screws
CAGE: 56232 — LOCKHEED MARTIN CORPORATION DIV RMS - MITCHEL FIELD (USA)
SPECIFICATIONS
materialSTEEL COMP 303 OVERALL
hole_typeDRILLED
head_styleKNURLED NO. 4
head_height0.250 INCHES NOMINAL IN
point_styleCONECONE
thread_class2A A
head_diameter0.250 INCHES NOMINAL IN
hole_diameter0.047 INCHES NOMINAL IN
hole_quantity1
thread_length0.250 INCHES MINIMUM IN
fastener_length2.250 INCHES NOMINAL2.250 INCHES NOMINAL IN
thread_directionRIGHT-HANDRIGHT-HAND
NSN5305-00-481-0683
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 279481 · 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: 0.250 INCHES NOMINAL IN
•
FASTENER LENGTH: 2.250 INCHES NOMINAL2.250 INCHES NOMINAL IN
•
THREAD LENGTH: 0.250 INCHES MINIMUM IN
•
HOLE CONFIGURATION STYLE: WING
•
MATERIAL DOCUMENT AND CLASSIFICATION: ASTM A582 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
•
NOMINAL THREAD DIAMETER: 0.164 INCHES IN
•
HEAD STYLE: KNURLED NO. 4
•
THREAD DIRECTION: RIGHT-HANDRIGHT-HAND
TECHNICAL CHARACTERISTICS
HEAD HEIGHT0.250 INCHES NOMINAL IN
FASTENER LENGTH2.250 INCHES NOMINAL2.250 INCHES NOMINAL IN
THREAD LENGTH0.250 INCHES MINIMUM IN
HOLE CONFIGURATION STYLEWING
MATERIAL DOCUMENT AND CLASSIFICATIONASTM A582 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
NOMINAL THREAD DIAMETER0.164 INCHES IN
HEAD STYLEKNURLED NO. 4
THREAD DIRECTIONRIGHT-HANDRIGHT-HAND
POINT STYLECONECONE
THREAD CLASS2A A
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

No substitute or cross-reference records for this part.

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 279481?
279481 is a THUMBSCREW.
What is the NSN for 279481?
279481 is cataloged in the U.S. Government catalog under NSN 5305-00-481-0683. 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.