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158649 — THUMBSCREW

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

158649: THUMBSCREW.

The THUMBSCREW is a the manufacturer industrial component. Key specifications include material: STEEL CORROSION RESISTING OVERALL, head_style: THUMB NO. 5, head_height: 0.525 INCHES NOMINAL IN, point_style: FLAT, thread_class: 3A A, thread_length: 0.403 INCHES MINIMUM IN.

This part is cataloged in the U.S. Government catalog under NSN 5305-00-754-3192, 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
158649
NSN: 5305-00-754-3192
FSC: 5305 — Screws
CAGE: 57712 — TELEMECHANICS INC (USA)
SPECIFICATIONS
materialSTEEL CORROSION RESISTING OVERALL
head_styleTHUMB NO. 5
head_height0.525 INCHES NOMINAL IN
point_styleFLAT
thread_class3A A
thread_length0.403 INCHES MINIMUM IN
shoulder_shapeROUND FIRST SHOULDER
fastener_length0.953 INCHES NOMINAL IN
shoulder_length0.150 INCHES NOMINAL FIRST SHOULDER IN
thread_directionRIGHT-HAND
shoulder_diameter0.156 INCHES NOMINAL FIRST SHOULDER IN
surface_treatmentPASSIVATE OVERALL
NSN5305-00-754-3192
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 158649 · 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: 0.525 INCHES NOMINAL IN
•
FASTENER LENGTH: 0.953 INCHES NOMINAL IN
•
SHOULDER LENGTH: 0.150 INCHES NOMINAL FIRST SHOULDER IN
•
SHOULDER DIAMETER: 0.156 INCHES NOMINAL FIRST SHOULDER IN
•
THREAD LENGTH: 0.403 INCHES MINIMUM IN
•
SHOULDER SHAPE: ROUND FIRST SHOULDER
•
NOMINAL THREAD DIAMETER: 0.112 INCHES IN
•
HEAD STYLE: THUMB NO. 5
TECHNICAL CHARACTERISTICS
HEAD HEIGHT0.525 INCHES NOMINAL IN
FASTENER LENGTH0.953 INCHES NOMINAL IN
SHOULDER LENGTH0.150 INCHES NOMINAL FIRST SHOULDER IN
SHOULDER DIAMETER0.156 INCHES NOMINAL FIRST SHOULDER IN
THREAD LENGTH0.403 INCHES MINIMUM IN
SHOULDER SHAPEROUND FIRST SHOULDER
NOMINAL THREAD DIAMETER0.112 INCHES IN
HEAD STYLETHUMB NO. 5
THREAD DIRECTIONRIGHT-HAND
POINT STYLEFLAT
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 158649?
158649 is a THUMBSCREW.
What is the NSN for 158649?
158649 is cataloged in the U.S. Government catalog under NSN 5305-00-754-3192. 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.