PartsTable
Technical Data Sheet

5/16-18UNC2AX.875 — SCREW,CAP,HEXAGON HEAD

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

5/16-18UNC2AX.875: SCREW,CAP,HEXAGON HEAD.

The SCREW,CAP,HEXAGON HEAD is a the manufacturer industrial component. Key specifications include head_style: HEXAGON, thread_class: 2A A, fastener_length: 0.875 INCHES NOMINAL IN, thread_direction: RIGHT-HAND, end_item_identification: COMPENSATING FAIRING ASSEMBLY HORSE COLLAR BRG ASSEMBLY, nominal_thread_diameter: 0.312 INCHES IN. This part is cataloged in the U.S.

Government catalog under NSN 5305-01-485-3631, 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
5/16-18UNC2AX.875
NSN: 5305-01-485-3631
FSC: 5305 — Screws
CAGE: 53711 — NAVAL SEA SYSTEMS COMMAND (USA)
SPECIFICATIONS
head_styleHEXAGON
thread_class2A A
fastener_length0.875 INCHES NOMINAL IN
thread_directionRIGHT-HAND
end_item_identificationCOMPENSATING FAIRING ASSEMBLY HORSE COLLAR BRG ASSEMBLY
nominal_thread_diameter0.312 INCHES IN
thread_quantity_per_inch18
thread_series_designatorUNIFIED NATIONAL COARSE (UNC)
part_name_assigned_by_controlling_agencySCREW HEX HD
NSN5305-01-485-3631
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 5/16-18UNC2AX.875 · 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
•
FASTENER LENGTH: 0.875 INCHES NOMINAL IN
•
NOMINAL THREAD DIAMETER: 0.312 INCHES IN
•
HEAD STYLE: HEXAGON
•
THREAD DIRECTION: RIGHT-HAND
•
THREAD CLASS: 2A A
•
THREAD QUANTITY PER INCH: 18
TECHNICAL CHARACTERISTICS
FASTENER LENGTH0.875 INCHES NOMINAL IN
NOMINAL THREAD DIAMETER0.312 INCHES IN
HEAD STYLEHEXAGON
THREAD DIRECTIONRIGHT-HAND
PART NAME ASSIGNED BY CONTROLLING AGENCYSCREW HEX HD
THREAD CLASS2A A
END ITEM IDENTIFICATIONCOMPENSATING FAIRING ASSEMBLY HORSE COLLAR BRG ASSEMBLY
THREAD QUANTITY PER INCH18
THREAD SERIES DESIGNATORUNIFIED NATIONAL COARSE (UNC)
SUBSTITUTES & CROSS-REFERENCES 2
57-304NReference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
585-6853522Reference document
Same NSN cross-reference
Reference document — Drawing number reference only
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 5/16-18UNC2AX.875?
5/16-18UNC2AX.875 is a SCREW,CAP,HEXAGON HEAD.
What parts can replace 5/16-18UNC2AX.875?
There are 2 known substitutes for 5/16-18UNC2AX.875: 57-304N, 585-6853522. Substitute compatibility should be verified for your specific system.
What is the NSN for 5/16-18UNC2AX.875?
5/16-18UNC2AX.875 is cataloged in the U.S. Government catalog under NSN 5305-01-485-3631. 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.