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B2-2940 — SCREW,EXTERNALLY RELIEVED BODY

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

B2-2940: SCREW,EXTERNALLY RELIEVED BODY.

The SCREW,EXTERNALLY RELIEVED BODY is a the manufacturer industrial component. Key specifications include material: STEEL COMP E9310 OVERALL, head_style: DEE CHAMFER, head_height: 0.205 INCHES MAXIMUM IN, head_diameter: 0.393 INCHES MAXIMUM IN, thread_length: 0.428 INCHES MINIMUM AND 0.438 INCHES MAXIMUM IN, fastener_length: 2.082 INCHES MINIMUM AND 2.092 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5305-00-778-7828, 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
B2-2940
NSN: 5305-00-778-7828
FSC: 5305 — Screws
CAGE: 31949 — BROOKS AUTOMATION, INC. DIV CTI CRYOGENICS (USA)
SPECIFICATIONS
materialSTEEL COMP E9310 OVERALL
head_styleDEE CHAMFER
head_height0.205 INCHES MAXIMUM IN
head_diameter0.393 INCHES MAXIMUM IN
thread_length0.428 INCHES MINIMUM AND 0.438 INCHES MAXIMUM IN
fastener_length2.082 INCHES MINIMUM AND 2.092 INCHES MAXIMUM IN
thread_directionRIGHT-HAND
internal_drive_styleCROSS RECESS TYPE 1
nominal_thread_diameter6.0 MILLIMETERS MM
first_diameter_from_head0.234 INCHES MINIMUM AND 0.238 INCHES MAXIMUM IN
third_diameter_from_head0.235 INCHES MINIMUM AND 0.236 INCHES MAXIMUM IN
fourth_diameter_from_head0.173 INCHES MINIMUM AND 0.181 INCHES MAXIMUM IN
NSN5305-00-778-7828
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: B2-2940 · 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
•
FOURTH DIAMETER FROM HEAD: 0.173 INCHES MINIMUM AND 0.181 INCHES MAXIMUM IN
•
HEAD HEIGHT: 0.205 INCHES MAXIMUM IN
•
FASTENER LENGTH: 2.082 INCHES MINIMUM AND 2.092 INCHES MAXIMUM IN
•
DISTANCE FROM CENTERLINE TO FLAT: 0.149 INCHES MAXIMUM IN
•
THREAD PITCH IN MILLIMETERS: 25.4
•
THREAD LENGTH: 0.428 INCHES MINIMUM AND 0.438 INCHES MAXIMUM IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: AISI ASSN STD SINGLE MATERIAL RESPONSE OVERALL
•
FIRST DIAMETER FROM HEAD: 0.234 INCHES MINIMUM AND 0.238 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS
FOURTH DIAMETER FROM HEAD0.173 INCHES MINIMUM AND 0.181 INCHES MAXIMUM IN
HEAD HEIGHT0.205 INCHES MAXIMUM IN
FASTENER LENGTH2.082 INCHES MINIMUM AND 2.092 INCHES MAXIMUM IN
DISTANCE FROM CENTERLINE TO FLAT0.149 INCHES MAXIMUM IN
THREAD PITCH IN MILLIMETERS25.4
THREAD LENGTH0.428 INCHES MINIMUM AND 0.438 INCHES MAXIMUM IN
MATERIAL DOCUMENT AND CLASSIFICATIONAISI ASSN STD SINGLE MATERIAL RESPONSE OVERALL
FIRST DIAMETER FROM HEAD0.234 INCHES MINIMUM AND 0.238 INCHES MAXIMUM IN
DISTANCE FROM LARGEST BEARING SURFACE OF HEAD TO END OF SECOND DIAMETER0.504 INCHES MINIMUM AND 0.520 INCHES MAXIMUM IN
NOMINAL THREAD DIAMETER6.0 MILLIMETERS MM
SUBSTITUTES & CROSS-REFERENCES 1
394997Reference document
Same NSN cross-reference
Reference document — Design control — primary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is B2-2940?
B2-2940 is a SCREW,EXTERNALLY RELIEVED BODY.
What parts can replace B2-2940?
There is 1 known substitute for B2-2940: 394997. Substitute compatibility should be verified for your specific system.
What is the NSN for B2-2940?
B2-2940 is cataloged in the U.S. Government catalog under NSN 5305-00-778-7828. 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.