PartsTable
Technical Data Sheet
Download PDF

5278D — VALVE,CHECK

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

5278D: VALVE,CHECK.

The VALVE,CHECK is a the manufacturer industrial component. Key specifications include material: ALUMINUM ALLOY BODY, valve_size: 0.375 INCHES IN, style_designator: STRAIGHT THRU FLANGED ENDS, mounting_position: HORIZONTAL, face_to_face_distance: 8.000 INCHES IN, end_item_identification: SUPPORT EQUIPMENT (SE)B-2,BOMBER. This part is cataloged in the U.S.

Government catalog under NSN 5305-00-281-8231, 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
5278D
NSN: 5305-00-281-8231
NIINs: 002818231, 014813431
FSC: 5305 — Screws
CAGE: 63734 — KAITLIN CORP (USA)
SPECIFICATIONS
materialALUMINUM ALLOY BODY
valve_size0.375 INCHES IN
style_designatorSTRAIGHT THRU FLANGED ENDS
mounting_positionHORIZONTAL
face_to_face_distance8.000 INCHES IN
end_item_identificationSUPPORT EQUIPMENT (SE)B-2,BOMBER
NSN5305-00-281-8231
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 5278D · 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: 0.281 INCHES NOMINAL IN
•
FASTENER LENGTH: 1.000 INCHES NOMINAL IN
•
THREAD LENGTH: 1.000 INCHES NOMINAL IN
•
HOLE CONFIGURATION STYLE: HEXAGON FLATS
•
MATERIAL DOCUMENT AND CLASSIFICATION: SAE GR 5 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
•
NOMINAL THREAD DIAMETER: 0.438 INCHES IN
•
HEAD STYLE: HEXAGON
•
THREAD DIRECTION: RIGHT-HAND
TECHNICAL CHARACTERISTICS
HEAD HEIGHT0.281 INCHES NOMINAL IN
FASTENER LENGTH1.000 INCHES NOMINAL IN
THREAD LENGTH1.000 INCHES NOMINAL IN
HOLE CONFIGURATION STYLEHEXAGON FLATS
MATERIAL DOCUMENT AND CLASSIFICATIONSAE GR 5 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
NOMINAL THREAD DIAMETER0.438 INCHES IN
HEAD STYLEHEXAGON
THREAD DIRECTIONRIGHT-HAND
DEPARTURE FROM CITED DOCUMENTAS MODIFIED BY DRILLED HOLE
WIDTH BETWEEN FLATS0.625 INCHES NOMINAL IN
SUBSTITUTES & CROSS-REFERENCES 4
2X32Reference document
Same NSN cross-reference
Reference document — Secondary reference
243633Reference document
Same NSN cross-reference
Reference document — Secondary reference
141266HReference document
Same NSN cross-reference
Reference document — Secondary reference
S278DReference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
Ready to buy 5278D?
Compare prices from verified sellers on eBay
Buy on eBay →
As an eBay Partner, PartsTable may earn a commission. Your price is not affected.
FREQUENTLY ASKED QUESTIONS
What is 5278D?
5278D is a VALVE,CHECK.
What parts can replace 5278D?
There are 4 known substitutes for 5278D: 2X32, 243633, 141266H and 1 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 5278D?
5278D is cataloged in the U.S. Government catalog under NSN 5305-00-281-8231. This indicates validated use in U.S. government and defense supply chains.
Community Feedback
Leave a Comment
Comments are reviewed before appearing. You will receive an email to verify before your comment appears.

Request a Quote — 5278D

✓ 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.