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12981727-2 — THUMBSCREW

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

12981727-2: THUMBSCREW.

The THUMBSCREW is a the manufacturer industrial component. Key specifications include material: STEEL COMP 303 OVERALL, head_style: KNURLED NO. 6, head_height: 1.580 INCHES MINIMUM AND 1.600 INCHES MAXIMUM IN, thread_class: 2A A, head_diameter: 0.495 INCHES MINIMUM AND 0.505 INCHES MAXIMUM IN, thread_length: 0.490 INCHES MINIMUM AND 0.510 INCHES MAXIMUM IN.

This part is cataloged in the U.S. Government catalog under NSN 5305-01-450-3255, 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
12981727-2
NSN: 5305-01-450-3255
FSC: 5305 — Screws
CAGE: 19200 — COMBAT CAPABILITIES DEVELOPMENT COMMAND (CCDC) ARMAMENTS CENTER DBA CCDC DIV LOGISTICS RESEARCH AND ENGINEERING DIRECTORATE (USA)
SPECIFICATIONS
materialSTEEL COMP 303 OVERALL
head_styleKNURLED NO. 6
head_height1.580 INCHES MINIMUM AND 1.600 INCHES MAXIMUM IN
thread_class2A A
head_diameter0.495 INCHES MINIMUM AND 0.505 INCHES MAXIMUM IN
thread_length0.490 INCHES MINIMUM AND 0.510 INCHES MAXIMUM IN
fastener_length4.150 INCHES MINIMUM AND 4.170 INCHES MAXIMUM IN
thread_directionRIGHT-HAND
nominal_thread_diameter0.250 INCHES IN
thread_quantity_per_inch20
thread_series_designatorUNIFIED NATIONAL COARSE (UNC)
nonstandard_thread_pitch_diameter+0.2139 TO 0.2175 INCHES IN
NSN5305-01-450-3255
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 12981727-2 · 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: 1.580 INCHES MINIMUM AND 1.600 INCHES MAXIMUM IN
•
FASTENER LENGTH: 4.150 INCHES MINIMUM AND 4.170 INCHES MAXIMUM IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: MIL-STD-171, PARA 5.4.1 MIL STD SINGLE TREATMENT RESPONSE OVERALL
•
THREAD LENGTH: 0.490 INCHES MINIMUM AND 0.510 INCHES MAXIMUM IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: ASTM A581, A582, OR AMS 5640 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
•
NOMINAL THREAD DIAMETER: 0.250 INCHES IN
•
DISTANCE FROM LARGEST BEARING SURFACE OF HEAD TO END OF THIRD DIAMETER: 4.160 INCHES NOMINAL IN
•
HEAD STYLE: KNURLED NO. 6
TECHNICAL CHARACTERISTICS
HEAD HEIGHT1.580 INCHES MINIMUM AND 1.600 INCHES MAXIMUM IN
FASTENER LENGTH4.150 INCHES MINIMUM AND 4.170 INCHES MAXIMUM IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONMIL-STD-171, PARA 5.4.1 MIL STD SINGLE TREATMENT RESPONSE OVERALL
THREAD LENGTH0.490 INCHES MINIMUM AND 0.510 INCHES MAXIMUM IN
MATERIAL DOCUMENT AND CLASSIFICATIONASTM A581, A582, OR AMS 5640 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
NOMINAL THREAD DIAMETER0.250 INCHES IN
DISTANCE FROM LARGEST BEARING SURFACE OF HEAD TO END OF THIRD DIAMETER4.160 INCHES NOMINAL IN
HEAD STYLEKNURLED NO. 6
THREAD DIRECTIONRIGHT-HAND
NONSTANDARD THREAD PITCH DIAMETER+0.2139 TO 0.2175 INCHES IN
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 12981727-2?
12981727-2 is a THUMBSCREW.
What is the NSN for 12981727-2?
12981727-2 is cataloged in the U.S. Government catalog under NSN 5305-01-450-3255. 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.