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B4040644-2 — SCREW ASSEMBLY,PANEL

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

B4040644-2: SCREW ASSEMBLY,PANEL.

The SCREW ASSEMBLY,PANEL is a the manufacturer industrial component. Key specifications include head_style: HEXAGON, head_height: 0.105 INCHES MINIMUM AND 0.105 INCHES MINIMUM AND 0.120 INCHES MAXIMUM0.120 INCHES MAXIMUM IN, thread_class: 3A3A, thread_length: 0.250 INCHES NOMINAL IN, fastener_length: 1.040 INCHES NOMINAL1.040 INCHES NOMINAL IN, thread_direction: RIGHT-HAND. This part is cataloged in the U.S.

Government catalog under NSN 5305-01-243-9415, 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
B4040644-2
NSN: 5305-01-243-9415
FSC: 5305 — Screws
CAGE: 56996 — DEPARTMENT OF THE ARMY HQ UNITED STATES ARMY COMMUNICATIONS RESEARCH AND DEVELOPMENT COMMAND (USA)
SPECIFICATIONS
head_styleHEXAGON
head_height0.105 INCHES MINIMUM AND 0.105 INCHES MINIMUM AND 0.120 INCHES MAXIMUM0.120 INCHES MAXIMUM IN
thread_class3A3A
thread_length0.250 INCHES NOMINAL IN
fastener_length1.040 INCHES NOMINAL1.040 INCHES NOMINAL IN
thread_directionRIGHT-HAND
surface_treatmentPASSIVATE SECONDARY WASHER
width_between_flats0.367 INCHES MINIMUM AND 0.375 INCHES MAXIMUM IN
internal_drive_styleSLOT
nominal_thread_diameter0.190 INCHES0.190 INCHES IN
minimum_tensile_strength140000 POUNDS PER SQUARE INCH140000 POUNDS PER SQUARE INCH LBS
thread_quantity_per_inch3232
NSN5305-01-243-9415
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: B4040644-2 · 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: 0.105 INCHES MINIMUM AND 0.105 INCHES MINIMUM AND 0.120 INCHES MAXIMUM0.120 INCHES MAXIMUM IN
•
FASTENER LENGTH: 1.040 INCHES NOMINAL1.040 INCHES NOMINAL IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE PRIMARY WASHER
•
MATERIAL ACCOMMODATED THICKNESS: 0.188 INCHES MINIMUM AND 0.188 INCHES MINIMUM AND 0.250 INCHES MAXIMUM0.250 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS
HEAD HEIGHT0.105 INCHES MINIMUM AND 0.105 INCHES MINIMUM AND 0.120 INCHES MAXIMUM0.120 INCHES MAXIMUM IN
FASTENER LENGTH1.040 INCHES NOMINAL1.040 INCHES NOMINAL IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE PRIMARY WASHER
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE SECONDARY WASHER
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE FASTENER
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE SPRING
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONMIL-A-8625,TYPE1,CLASS 1 MIL SPEC SINGLE TREATMENT RESPONSE STAND-OFF
MATERIAL ACCOMMODATED THICKNESS0.188 INCHES MINIMUM AND 0.188 INCHES MINIMUM AND 0.250 INCHES MAXIMUM0.250 INCHES MAXIMUM IN
THREAD LENGTH0.250 INCHES NOMINAL IN
MATERIAL DOCUMENT AND CLASSIFICATIONASTM A580 ASSN STD SINGLE MATERIAL RESPONSE SPRING
OTHER ITEMS IN FSC 5305 — Screws
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5305-00-000-0094 5305-00-000-1397 5305-00-000-2625 5305-00-000-3669 5305-00-000-3830 5305-00-000-3831
SUBSTITUTES & CROSS-REFERENCES 2
SDL-7900-10-D-4Reference document
Same NSN cross-reference
Reference document — Secondary reference
FT1378-10-4-4Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
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 B4040644-2?
B4040644-2 is a SCREW ASSEMBLY,PANEL.
What parts can replace B4040644-2?
There are 2 known substitutes for B4040644-2: SDL-7900-10-D-4, FT1378-10-4-4. Substitute compatibility should be verified for your specific system.
What is the NSN for B4040644-2?
B4040644-2 is cataloged in the U.S. Government catalog under NSN 5305-01-243-9415. 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.