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20308 BLK.OXIDE — SCREW,MACHINE

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

20308 BLK.OXIDE: SCREW,MACHINE.

The SCREW,MACHINE is a the manufacturer industrial component. Key specifications include head_style: FLAT COUNTERSUNK, thread_class: 2A A, head_diameter: 0.452 INCHES MINIMUM AND 0.507 INCHES MAXIMUM IN, thread_length: 0.650 INCHES MINIMUM AND 0.750 INCHES MAXIMUM IN, screw_material: COPPER ALLOY, fastener_length: 0.750 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5305-00-206-3693, 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
20308 BLK.OXIDE
NSN: 5305-00-206-3693
FSC: 5305 — Screws
CAGE: 73734 — FEDERAL SCREW PRODUCTS, INC. (USA)
SPECIFICATIONS
head_styleFLAT COUNTERSUNK
thread_class2A A
head_diameter0.452 INCHES MINIMUM AND 0.507 INCHES MAXIMUM IN
thread_length0.650 INCHES MINIMUM AND 0.750 INCHES MAXIMUM IN
screw_materialCOPPER ALLOY
fastener_length0.750 INCHES NOMINAL IN
thread_directionRIGHT-HAND
countersink_angle80.0 DEGREES MINIMUM AND 82.0 DEGREES MAXIMUM
internal_drive_styleCROSS RECESS TYPE 1
nominal_thread_diameter0.250 INCHES IN
minimum_tensile_strength57000 POUNDS PER SQUARE INCH LBS
thread_quantity_per_inch20
NSN5305-00-206-3693
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 20308 BLK.OXIDE · 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: 0.750 INCHES NOMINAL IN
•
SCREW MATERIAL DOCUMENT AND CLASSIFICATION: QQ-B-626 FED SPEC SINGLE MATERIAL RESPONSE OR QQ-W-321 FED SPEC SINGLE MATERIAL RESPONSE
•
THREAD LENGTH: 0.650 INCHES MINIMUM AND 0.750 INCHES MAXIMUM IN
•
NOMINAL THREAD DIAMETER: 0.250 INCHES IN
•
HEAD STYLE: FLAT COUNTERSUNK
•
THREAD DIRECTION: RIGHT-HAND
•
SCREW MATERIAL: COPPER ALLOY
•
MINIMUM TENSILE STRENGTH: 57000 POUNDS PER SQUARE INCH LBS
TECHNICAL CHARACTERISTICS
FASTENER LENGTH0.750 INCHES NOMINAL IN
SCREW MATERIAL DOCUMENT AND CLASSIFICATIONQQ-B-626 FED SPEC SINGLE MATERIAL RESPONSE OR QQ-W-321 FED SPEC SINGLE MATERIAL RESPONSE
THREAD LENGTH0.650 INCHES MINIMUM AND 0.750 INCHES MAXIMUM IN
NOMINAL THREAD DIAMETER0.250 INCHES IN
HEAD STYLEFLAT COUNTERSUNK
THREAD DIRECTIONRIGHT-HAND
SCREW MATERIALCOPPER ALLOY
MINIMUM TENSILE STRENGTH57000 POUNDS PER SQUARE INCH LBS
INTERNAL DRIVE STYLECROSS RECESS TYPE 1
COUNTERSINK ANGLE80.0 DEGREES MINIMUM AND 82.0 DEGREES MAXIMUM
SUBSTITUTES & CROSS-REFERENCES 7
FF-S-92Reference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
MS35198-71 1/4- 20UNC-2AX3/4LG3Reference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
MS35198-71Reference document
Same NSN cross-reference
Reference document — Secondary reference
20308 BLK.OXIDEADXReference document
Same NSN cross-reference
Reference document — Secondary reference
MS35198-71 1/4- 20UNC-2A X 3/4LReference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
163-10Reference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
LIFECYCLE
NSN statusCancelled· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 20308 BLK.OXIDE?
20308 BLK.OXIDE is a SCREW,MACHINE.
What parts can replace 20308 BLK.OXIDE?
There are 7 known substitutes for 20308 BLK.OXIDE: FF-S-92, MS35198-71 1/4- 20UNC-2AX3/4LG3, MS35198-71 and 4 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 20308 BLK.OXIDE?
20308 BLK.OXIDE is cataloged in the U.S. Government catalog under NSN 5305-00-206-3693. 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.