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421379 — SCREW,MACHINE

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

421379: SCREW,MACHINE.

The SCREW,MACHINE is a the manufacturer industrial component. Key specifications include head_style: FLAT COUNTERSUNK, thread_class: 2A A, head_diameter: 0.195 INCHES MINIMUM AND 0.225 INCHES MAXIMUM IN, thread_length: 0.683 INCHES MINIMUM IN, screw_material: COPPER ALLOY, fastener_length: 0.750 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5305-00-042-1379, 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
421379
NSN: 5305-00-042-1379
FSC: 5305 — Screws
CAGE: 7X677 — GENERAL MOTORS LLC DBA GENERAL MOTORS LLC (USA)
SPECIFICATIONS
head_styleFLAT COUNTERSUNK
thread_class2A A
head_diameter0.195 INCHES MINIMUM AND 0.225 INCHES MAXIMUM IN
thread_length0.683 INCHES MINIMUM 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_styleSLOT
nominal_thread_diameter0.112 INCHES IN
minimum_tensile_strength55000 POUNDS PER SQUARE INCH LBS
thread_quantity_per_inch48
NSN5305-00-042-1379
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 421379 · 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-613 FED SPEC SINGLE MATERIAL RESPONSE OR QQ-B-626 FED SPEC SINGLE MATERIAL RESPONSE OR QQ-W-321 FED SPEC SINGLE MATERIAL RESPONSE
•
THREAD LENGTH: 0.683 INCHES MINIMUM IN
•
NOMINAL THREAD DIAMETER: 0.112 INCHES IN
•
HEAD STYLE: FLAT COUNTERSUNK
•
THREAD DIRECTION: RIGHT-HAND
•
NONDEFINITIVE SPEC/STD DATA: 1 TYPE AND 2S STYLE
•
SCREW MATERIAL: COPPER ALLOY
TECHNICAL CHARACTERISTICS
FASTENER LENGTH0.750 INCHES NOMINAL IN
SCREW MATERIAL DOCUMENT AND CLASSIFICATIONQQ-B-613 FED SPEC SINGLE MATERIAL RESPONSE OR QQ-B-626 FED SPEC SINGLE MATERIAL RESPONSE OR QQ-W-321 FED SPEC SINGLE MATERIAL RESPONSE
THREAD LENGTH0.683 INCHES MINIMUM IN
NOMINAL THREAD DIAMETER0.112 INCHES IN
HEAD STYLEFLAT COUNTERSUNK
THREAD DIRECTIONRIGHT-HAND
NONDEFINITIVE SPEC/STD DATA1 TYPE AND 2S STYLE
SCREW MATERIALCOPPER ALLOY
MINIMUM TENSILE STRENGTH55000 POUNDS PER SQUARE INCH LBS
INTERNAL DRIVE STYLESLOT
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 1
FFS92Reference document
Same NSN cross-reference
Reference document — Identification reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 421379?
421379 is a SCREW,MACHINE.
What parts can replace 421379?
There is 1 known substitute for 421379: FFS92. Substitute compatibility should be verified for your specific system.
What is the NSN for 421379?
421379 is cataloged in the U.S. Government catalog under NSN 5305-00-042-1379. 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.