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51218-311 — SCREW,MACHINE

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

51218-311: SCREW,MACHINE.

The SCREW,MACHINE is a the manufacturer industrial component. Key specifications include head_style: ROUND, thread_length: 2.250 INCHES NOMINAL IN, screw_material: STEEL, thread_direction: RIGHT-HAND, internal_drive_style: HIGH-TORQUE, nominal_thread_diameter: 0.164 INCHES IN. This part is cataloged in the U.S.

Government catalog under NSN 5305-01-008-2355, 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
51218-311
NSN: 5305-01-008-2355
FSC: 5305 — Screws
CAGE: 74063 — TE CONNECTIVITY CORPORATION (USA)
SPECIFICATIONS
head_styleROUND
thread_length2.250 INCHES NOMINAL IN
screw_materialSTEEL
thread_directionRIGHT-HAND
internal_drive_styleHIGH-TORQUE
nominal_thread_diameter0.164 INCHES IN
screw_surface_treatmentCADMIUM OR CHROMIUM
thread_quantity_per_inch32
thread_series_designatorUNIFIED NATIONAL COARSE (UNC)
NSN5305-01-008-2355
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 51218-311 · 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
•
SCREW SURFACE TREATMENT: CADMIUM OR CHROMIUM
•
THREAD LENGTH: 2.250 INCHES NOMINAL IN
•
NOMINAL THREAD DIAMETER: 0.164 INCHES IN
•
HEAD STYLE: ROUND
•
THREAD DIRECTION: RIGHT-HAND
•
SCREW MATERIAL: STEEL
•
INTERNAL DRIVE STYLE: HIGH-TORQUE
•
THREAD QUANTITY PER INCH: 32
TECHNICAL CHARACTERISTICS
SCREW SURFACE TREATMENTCADMIUM OR CHROMIUM
THREAD LENGTH2.250 INCHES NOMINAL IN
NOMINAL THREAD DIAMETER0.164 INCHES IN
HEAD STYLEROUND
THREAD DIRECTIONRIGHT-HAND
SCREW MATERIALSTEEL
INTERNAL DRIVE STYLEHIGH-TORQUE
THREAD QUANTITY PER INCH32
THREAD SERIES DESIGNATORUNIFIED NATIONAL COARSE (UNC)
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
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 51218-311?
51218-311 is a SCREW,MACHINE.
What is the NSN for 51218-311?
51218-311 is cataloged in the U.S. Government catalog under NSN 5305-01-008-2355. 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.