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8173505 — THUMBSCREW

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

8173505: THUMBSCREW.

The THUMBSCREW is a the manufacturer industrial component. Key specifications include material: STEEL COMP 303 OVERALL, head_style: KNURLED NO. 1, head_height: 0.438 INCHES NOMINAL IN, point_style: CONE, point_length: 0.156 INCHES NOMINAL IN, thread_class: 2A A.

This part is cataloged in the U.S. Government catalog under NSN 5305-00-796-9579, 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
8173505
NSN: 5305-00-796-9579
FSC: 5305 — Screws
CAGE: 18876 — US ARMY AVIATION AND MISSILE COMMAND (USA)
SPECIFICATIONS
materialSTEEL COMP 303 OVERALL
head_styleKNURLED NO. 1
head_height0.438 INCHES NOMINAL IN
point_styleCONE
point_length0.156 INCHES NOMINAL IN
thread_class2A A
head_diameter1.250 INCHES NOMINAL IN
thread_length0.844 INCHES NOMINAL IN
fastener_length2.188 INCHES NOMINAL IN
thread_directionRIGHT-HAND
surface_treatmentPASSIVATE OVERALL
point_chamfer_angle90.0 DEGREES MINIMUM
NSN5305-00-796-9579
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 8173505 · 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: 0.438 INCHES NOMINAL IN
•
POINT LENGTH: 0.156 INCHES NOMINAL IN
•
FASTENER LENGTH: 2.188 INCHES NOMINAL IN
•
THREAD LENGTH: 0.844 INCHES NOMINAL IN
•
POINT CHAMFER ANGLE: 90.0 DEGREES MINIMUM
•
NOMINAL THREAD DIAMETER: 0.312 INCHES IN
•
HEAD STYLE: KNURLED NO. 1
•
THREAD DIRECTION: RIGHT-HAND
TECHNICAL CHARACTERISTICS
HEAD HEIGHT0.438 INCHES NOMINAL IN
POINT LENGTH0.156 INCHES NOMINAL IN
FASTENER LENGTH2.188 INCHES NOMINAL IN
THREAD LENGTH0.844 INCHES NOMINAL IN
POINT CHAMFER ANGLE90.0 DEGREES MINIMUM
NOMINAL THREAD DIAMETER0.312 INCHES IN
HEAD STYLEKNURLED NO. 1
THREAD DIRECTIONRIGHT-HAND
POINT STYLECONE
SURFACE TREATMENTPASSIVATE OVERALL
OTHER ITEMS IN FSC 5305 — Screws
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5305-00-000-0094 5305-00-000-1397 5305-00-000-2625 5305-00-000-3669 5305-00-000-3830 5305-00-000-3831
SUBSTITUTES & CROSS-REFERENCES

No substitute or cross-reference records for this part.

LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 8173505?
8173505 is a THUMBSCREW.
What is the NSN for 8173505?
8173505 is cataloged in the U.S. Government catalog under NSN 5305-00-796-9579. 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.