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BCKX1EC1 — SCREW,MACHINE

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

BCKX1EC1: SCREW,MACHINE.

The SCREW,MACHINE is a the manufacturer industrial component. Key specifications include head_style: FLAT COUNTERSUNK, thread_class: 2A A, head_diameter: 0.249 INCHES MINIMUM AND 0.279 INCHES MAXIMUM IN, thread_length: 0.167 INCHES MINIMUM IN, fastener_length: 0.250 INCHES NOMINAL IN, thread_direction: RIGHT-HAND. This part is cataloged in the U.S.

Government catalog under NSN 5305-00-013-3414, 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
BCKX1EC1
NSN: 5305-00-013-3414
FSC: 5305 — Screws
CAGE: 00000
SPECIFICATIONS
head_styleFLAT COUNTERSUNK
thread_class2A A
head_diameter0.249 INCHES MINIMUM AND 0.279 INCHES MAXIMUM IN
thread_length0.167 INCHES MINIMUM IN
fastener_length0.250 INCHES NOMINAL IN
thread_directionRIGHT-HAND
countersink_angle80.0 DEGREES MINIMUM AND 82.0 DEGREES MAXIMUM
internal_drive_styleSLOT
nominal_thread_diameter0.138 INCHES IN
screw_surface_treatmentCADMIUM AND DICHROMATE OR ZINC AND DICHROMATE
thread_quantity_per_inch32
thread_series_designatorUNIFIED NATIONAL COARSE (UNC)
NSN5305-00-013-3414
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: BCKX1EC1 · 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 DICHROMATE OR ZINC AND DICHROMATE
•
FASTENER LENGTH: 0.250 INCHES NOMINAL IN
•
SCREW MATERIAL DOCUMENT AND CLASSIFICATION: QQ-S-633 EXCEPT BESSEMER COMP FED SPEC 1ST MATERIAL RESPONSE OR QQ-W-409 FED SPEC 2ND MATERIAL RESPONSE OR QQ-W-409 FED SPEC 3RD MATERIAL RESPONSE OR QQ-W-409 FED SPEC 4TH MATERIAL RESPONSE OR QQ-W-409 FED SPEC 5TH MATERIAL RESPONSE OR QQ-W-409,GRADE 3 FED SPEC 6TH MATERIAL RESPONSE OR QQ-W-409 FED SPEC 7TH MATERIAL RESPONSE OR QQ-W-409 FED SPEC 8TH MATERIAL RESPONSE OR QQ-W-409 FED SPEC 9TH MATERIAL RESPONSE OR QQ-W-409 FED SPEC 10TH MATERIAL RESPONSE OR QQ-W-409 FED SPEC 11TH MATERIAL RESPONSE OR QQ-W-409 FED SPEC 12TH MATERIAL RESPONSE OR QQ-W-409 FED SPEC 13TH MATERIAL RESPONSE OR QQ-W-409 FED SPEC 14TH MATERIAL RESPONSE
•
THREAD LENGTH: 0.167 INCHES MINIMUM IN
•
NOMINAL THREAD DIAMETER: 0.138 INCHES IN
•
HEAD STYLE: FLAT COUNTERSUNK
•
THREAD DIRECTION: RIGHT-HAND
•
NONDEFINITIVE SPEC/STD DATA: I TYPE AND 2S STYLE
TECHNICAL CHARACTERISTICS
SCREW SURFACE TREATMENTCADMIUM AND DICHROMATE OR ZINC AND DICHROMATE
FASTENER LENGTH0.250 INCHES NOMINAL IN
SCREW MATERIAL DOCUMENT AND CLASSIFICATIONQQ-S-633 EXCEPT BESSEMER COMP FED SPEC 1ST MATERIAL RESPONSE OR QQ-W-409 FED SPEC 2ND MATERIAL RESPONSE OR QQ-W-409 FED SPEC 3RD MATERIAL RESPONSE OR QQ-W-409 FED SPEC 4TH MATERIAL RESPONSE OR QQ-W-409 FED SPEC 5TH MATERIAL RESPONSE OR QQ-W-409,GRADE 3 FED SPEC 6TH MATERIAL RESPONSE OR QQ-W-409 FED SPEC 7TH MATERIAL RESPONSE OR QQ-W-409 FED SPEC 8TH MATERIAL RESPONSE OR QQ-W-409 FED SPEC 9TH MATERIAL RESPONSE OR QQ-W-409 FED SPEC 10TH MATERIAL RESPONSE OR QQ-W-409 FED SPEC 11TH MATERIAL RESPONSE OR QQ-W-409 FED SPEC 12TH MATERIAL RESPONSE OR QQ-W-409 FED SPEC 13TH MATERIAL RESPONSE OR QQ-W-409 FED SPEC 14TH MATERIAL RESPONSE
THREAD LENGTH0.167 INCHES MINIMUM IN
NOMINAL THREAD DIAMETER0.138 INCHES IN
HEAD STYLEFLAT COUNTERSUNK
THREAD DIRECTIONRIGHT-HAND
NONDEFINITIVE SPEC/STD DATAI TYPE AND 2S STYLE
INTERNAL DRIVE STYLESLOT
COUNTERSINK ANGLE80.0 DEGREES MINIMUM AND 82.0 DEGREES MAXIMUM
SUBSTITUTES & CROSS-REFERENCES 3
P111374Reference document
Same NSN cross-reference
Reference document — Secondary reference
133414Reference document
Same NSN cross-reference
Reference document — Secondary reference
MS35241-33Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusCancelled· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is BCKX1EC1?
BCKX1EC1 is a SCREW,MACHINE.
What parts can replace BCKX1EC1?
There are 3 known substitutes for BCKX1EC1: P111374, 133414, MS35241-33. Substitute compatibility should be verified for your specific system.
What is the NSN for BCKX1EC1?
BCKX1EC1 is cataloged in the U.S. Government catalog under NSN 5305-00-013-3414. 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.