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SII-1087-0403 — SCREW,MACHINE

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

SII-1087-0403: SCREW,MACHINE.

The SCREW,MACHINE is a the manufacturer industrial component. Key specifications include head_style: FLAT COUNTERSUNK, thread_class: 3A A, head_diameter: 0.461 INCHES MINIMUM AND 0.507 INCHES MAXIMUM IN, thread_length: 0.401 INCHES MINIMUM AND 0.451 INCHES MAXIMUM IN, screw_material: STEEL COMP E4340 OR STEEL COMP 4140 OR STEEL COMP 8740 OR STEEL COMP 8735 OR STEEL COMP 6150, fastener_length: 0.599 INCHES MINIMUM AND 0.629 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5305-01-284-2993, 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
SII-1087-0403
NSN: 5305-01-284-2993
FSC: 5305 — Screws
CAGE: 57928 — SONIC INDUSTRIES, INC. DBA SONIC INDUSTRIES INC DIV SONIC INDUSTRIES (USA)
SPECIFICATIONS
head_styleFLAT COUNTERSUNK
thread_class3A A
head_diameter0.461 INCHES MINIMUM AND 0.507 INCHES MAXIMUM IN
thread_length0.401 INCHES MINIMUM AND 0.451 INCHES MAXIMUM IN
screw_materialSTEEL COMP E4340 OR STEEL COMP 4140 OR STEEL COMP 8740 OR STEEL COMP 8735 OR STEEL COMP 6150
fastener_length0.599 INCHES MINIMUM AND 0.629 INCHES MAXIMUM IN
hardness_rating36.0 ROCKWELL C MINIMUM AND 40.0 ROCKWELL C MAXIMUM
thread_directionRIGHT-HAND
countersink_angle99.0 DEGREES MINIMUM AND 101.0 DEGREES MAXIMUM
internal_drive_styleTORQUE SET
nominal_thread_diameter0.250 INCHES IN
screw_surface_treatmentCADMIUM AND CHROMATE
NSN5305-01-284-2993
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: SII-1087-0403 · 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 AND CHROMATE
•
FASTENER LENGTH: 0.599 INCHES MINIMUM AND 0.629 INCHES MAXIMUM IN
•
THREAD LENGTH: 0.401 INCHES MINIMUM AND 0.451 INCHES MAXIMUM IN
•
HARDNESS RATING: 36.0 ROCKWELL C MINIMUM AND 40.0 ROCKWELL C MAXIMUM
•
NOMINAL THREAD DIAMETER: 0.250 INCHES IN
•
HEAD STYLE: FLAT COUNTERSUNK
•
THREAD DIRECTION: RIGHT-HAND
•
SCREW MATERIAL: STEEL COMP E4340 OR STEEL COMP 4140 OR STEEL COMP 8740 OR STEEL COMP 8735 OR STEEL COMP 6150
TECHNICAL CHARACTERISTICS
SCREW SURFACE TREATMENTCADMIUM AND CHROMATE
FASTENER LENGTH0.599 INCHES MINIMUM AND 0.629 INCHES MAXIMUM IN
THREAD LENGTH0.401 INCHES MINIMUM AND 0.451 INCHES MAXIMUM IN
HARDNESS RATING36.0 ROCKWELL C MINIMUM AND 40.0 ROCKWELL C MAXIMUM
NOMINAL THREAD DIAMETER0.250 INCHES IN
HEAD STYLEFLAT COUNTERSUNK
THREAD DIRECTIONRIGHT-HAND
SCREW MATERIALSTEEL COMP E4340 OR STEEL COMP 4140 OR STEEL COMP 8740 OR STEEL COMP 8735 OR STEEL COMP 6150
MINIMUM TENSILE STRENGTH160000 POUNDS PER SQUARE INCH LBS
INTERNAL DRIVE STYLETORQUE SET
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 9
FIT111-0032-0403Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
W111-0032-0403Reference document
Same NSN cross-reference
Reference document — Secondary reference
LE111-0032-0403Reference document
Same NSN cross-reference
Reference document — Secondary reference
MA2LE132Reference document
Same NSN cross-reference
Reference document — Secondary reference
PBF1378-0403Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
SCI785T-4-3Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
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 SII-1087-0403?
SII-1087-0403 is a SCREW,MACHINE.
What parts can replace SII-1087-0403?
There are 9 known substitutes for SII-1087-0403: FIT111-0032-0403, W111-0032-0403, LE111-0032-0403 and 6 more. Substitute compatibility should be verified for your specific system.
What is the NSN for SII-1087-0403?
SII-1087-0403 is cataloged in the U.S. Government catalog under NSN 5305-01-284-2993. 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.