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SC1786T-3-17 — SCREW,CLOSE TOLERANCE

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

SC1786T-3-17: SCREW,CLOSE TOLERANCE.

The SCREW,CLOSE TOLERANCE is a the manufacturer industrial component. Key specifications include material: STEEL COMP E4340 OR STEEL COMP 4140 OR STEEL COMP 8740 OR STEEL COMP 8735 OVERALL, head_style: OVAL COUNTERSUNK, grip_length: 1.062 INCHES NOMINAL IN, thread_class: 3A A, grip_diameter: 0.1885 INCHES MINIMUM AND 0.1895 INCHES MAXIMUM IN, head_diameter: 0.2966 INCHES MINIMUM AND 0.3016 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5305-01-417-4028, 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
SC1786T-3-17
NSN: 5305-01-417-4028
FSC: 5305 — Screws
CAGE: 06950 — HOWMET GLOBAL FASTENING SYSTEMS INC (USA)
SPECIFICATIONS
materialSTEEL COMP E4340 OR STEEL COMP 4140 OR STEEL COMP 8740 OR STEEL COMP 8735 OVERALL
head_styleOVAL COUNTERSUNK
grip_length1.062 INCHES NOMINAL IN
thread_class3A A
grip_diameter0.1885 INCHES MINIMUM AND 0.1895 INCHES MAXIMUM IN
head_diameter0.2966 INCHES MINIMUM AND 0.3016 INCHES MAXIMUM IN
thread_length0.338 INCHES MINIMUM IN
surface_finish32.0 MICROINCHES GRIP
fastener_length1.401 INCHES MINIMUM AND 1.416 INCHES MAXIMUM IN
thread_directionRIGHT-HAND
countersink_angle99.0 DEGREES MINIMUM AND 101.0 DEGREES MAXIMUM
surface_treatmentCADMIUM AND CHROMATE OVERALL
NSN5305-01-417-4028
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: SC1786T-3-17 · 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
•
SURFACE FINISH: 32.0 MICROINCHES THREADS
•
FASTENER LENGTH: 1.401 INCHES MINIMUM AND 1.416 INCHES MAXIMUM IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-416 TY 2 CL 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
•
THREAD LENGTH: 0.338 INCHES MINIMUM IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: MIL-S-5000 MIL SPEC 1ST MATERIAL RESPONSE OR MIL-S-5626 MIL SPEC 2ND MATERIAL RESPONSE OR MIL-S-6049 MIL SPEC 3RD MATERIAL RESPONSE OR MIL-S-6098 MIL SPEC 4TH MATERIAL RESPONSE OVERALL
•
NOMINAL THREAD DIAMETER: 0.190 INCHES IN
TECHNICAL CHARACTERISTICS
SURFACE FINISH32.0 MICROINCHES THREADS
SURFACE FINISH32.0 MICROINCHES GRIP
SURFACE FINISH32.0 MICROINCHES BEARING SURFACE OF HEAD
FASTENER LENGTH1.401 INCHES MINIMUM AND 1.416 INCHES MAXIMUM IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-416 TY 2 CL 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
THREAD LENGTH0.338 INCHES MINIMUM IN
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-S-5000 MIL SPEC 1ST MATERIAL RESPONSE OR MIL-S-5626 MIL SPEC 2ND MATERIAL RESPONSE OR MIL-S-6049 MIL SPEC 3RD MATERIAL RESPONSE OR MIL-S-6098 MIL SPEC 4TH MATERIAL RESPONSE OVERALL
NOMINAL THREAD DIAMETER0.190 INCHES IN
HEAD STYLEOVAL COUNTERSUNK
THREAD DIRECTIONRIGHT-HAND
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 4
PBF1381-0317Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
LE111-0035-0317Reference document
Same NSN cross-reference
Reference document — Secondary reference
123179A3T17Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
SII-1090-0317Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
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 SC1786T-3-17?
SC1786T-3-17 is a SCREW,CLOSE TOLERANCE.
What parts can replace SC1786T-3-17?
There are 4 known substitutes for SC1786T-3-17: PBF1381-0317, LE111-0035-0317, 123179A3T17 and 1 more. Substitute compatibility should be verified for your specific system.
What is the NSN for SC1786T-3-17?
SC1786T-3-17 is cataloged in the U.S. Government catalog under NSN 5305-01-417-4028. 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.