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PBF1166B4-8 — SCREW,CLOSE TOLERANCE

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

PBF1166B4-8: SCREW,CLOSE TOLERANCE.

The SCREW,CLOSE TOLERANCE is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, head_style: FLAT COUNTERSUNK, grip_length: 0.500 INCHES NOMINAL IN, head_height: 0.063 INCHES NOMINAL IN, point_style: FLAT, point_length: 0.045 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5305-01-682-0650, 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
PBF1166B4-8
NSN: 5305-01-682-0650
FSC: 5305 — Screws
CAGE: 17446 — HUCK INTERNATIONAL, INC (USA)
SPECIFICATIONS
materialSTEEL OVERALL
head_styleFLAT COUNTERSUNK
grip_length0.500 INCHES NOMINAL IN
head_height0.063 INCHES NOMINAL IN
point_styleFLAT
point_length0.045 INCHES NOMINAL IN
thread_class3A A
grip_diameter0.2485 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM IN
head_diameter0.350 INCHES MINIMUM AND 0.399 INCHES MAXIMUM IN
thread_length0.403 INCHES NOMINAL IN
fastener_length0.903 INCHES NOMINAL IN
hardness_rating46.0 ROCKWELL C MINIMUM AND 50.0 ROCKWELL C MAXIMUM OVERALL
NSN5305-01-682-0650
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: PBF1166B4-8 · 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: 0.063 INCHES NOMINAL IN
•
POINT LENGTH: 0.045 INCHES NOMINAL IN
•
FASTENER LENGTH: 0.903 INCHES NOMINAL IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: MIL-C-83488 TYPE II, CLASS 3 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL
•
THREAD LENGTH: 0.403 INCHES NOMINAL IN
•
HARDNESS RATING: 46.0 ROCKWELL C MINIMUM AND 50.0 ROCKWELL C MAXIMUM OVERALL
•
MATERIAL DOCUMENT AND CLASSIFICATION: AMS-6487 NATIONAL STD SINGLE MATERIAL RESPONSE OVERALL
•
POINT CHAMFER ANGLE: 45.0 DEGREES NOMINAL
TECHNICAL CHARACTERISTICS
HEAD HEIGHT0.063 INCHES NOMINAL IN
POINT LENGTH0.045 INCHES NOMINAL IN
FASTENER LENGTH0.903 INCHES NOMINAL IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONMIL-C-83488 TYPE II, CLASS 3 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL
THREAD LENGTH0.403 INCHES NOMINAL IN
HARDNESS RATING46.0 ROCKWELL C MINIMUM AND 50.0 ROCKWELL C MAXIMUM OVERALL
MATERIAL DOCUMENT AND CLASSIFICATIONAMS-6487 NATIONAL STD SINGLE MATERIAL RESPONSE OVERALL
POINT CHAMFER ANGLE45.0 DEGREES NOMINAL
NOMINAL THREAD DIAMETER0.2500 INCHES IN
HEAD STYLEFLAT COUNTERSUNK
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
985B4-8Reference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
H185B4-8Reference document
Same NSN cross-reference
Reference document — Secondary reference
C7985B4-8Reference document
Same NSN cross-reference
Reference document — Vendor item drawing reference
AIC985-4-8BReference document
Same NSN cross-reference
Reference document — Secondary reference
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 PBF1166B4-8?
PBF1166B4-8 is a SCREW,CLOSE TOLERANCE.
What parts can replace PBF1166B4-8?
There are 4 known substitutes for PBF1166B4-8: 985B4-8, H185B4-8, C7985B4-8 and 1 more. Substitute compatibility should be verified for your specific system.
What is the NSN for PBF1166B4-8?
PBF1166B4-8 is cataloged in the U.S. Government catalog under NSN 5305-01-682-0650. 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.