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B74133 — SCREW,PANEL FASTENER

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

B74133: SCREW,PANEL FASTENER.

The SCREW,PANEL FASTENER is a the manufacturer industrial component. Key specifications include material: UNABLE TO DECODE, head_style: FLAT CHAMFER, head_height: 0.306 INCHES MINIMUM AND 0.312 INCHES MAXIMUM IN, thread_class: 3A A, head_diameter: 0.457 INCHES MINIMUM AND 0.469 INCHES MAXIMUM IN, thread_length: 0.312 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5305-01-516-7945, 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
B74133
NSN: 5305-01-516-7945
FSC: 5305 — Screws
CAGE: 05825 — O T S I (USA)
SPECIFICATIONS
materialUNABLE TO DECODE
head_styleFLAT CHAMFER
head_height0.306 INCHES MINIMUM AND 0.312 INCHES MAXIMUM IN
thread_class3A A
head_diameter0.457 INCHES MINIMUM AND 0.469 INCHES MAXIMUM IN
thread_length0.312 INCHES NOMINAL IN
fastener_length1.000 INCHES NOMINAL IN
special_featuresSCREW SHANK .247" DIA
surface_treatmentUNABLE TO DECODE
width_across_flats0.250 INCHES NOMINAL IN
internal_drive_styleHEXAGON
end_item_identificationHEAVYWEIGHT TORPEDO
NSN5305-01-516-7945
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: B74133 · 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
•
WIDTH ACROSS FLATS: 0.250 INCHES NOMINAL IN
•
HEAD HEIGHT: 0.306 INCHES MINIMUM AND 0.312 INCHES MAXIMUM IN
•
FASTENER LENGTH: 1.000 INCHES NOMINAL IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: UNABLE TO DECODE
•
THREAD LENGTH: 0.312 INCHES NOMINAL IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: UNABLE TO DECODE
•
NOMINAL THREAD DIAMETER: 0.3125 INCHES IN
•
HEAD STYLE: FLAT CHAMFER
TECHNICAL CHARACTERISTICS
WIDTH ACROSS FLATS0.250 INCHES NOMINAL IN
HEAD HEIGHT0.306 INCHES MINIMUM AND 0.312 INCHES MAXIMUM IN
FASTENER LENGTH1.000 INCHES NOMINAL IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONUNABLE TO DECODE
THREAD LENGTH0.312 INCHES NOMINAL IN
MATERIAL DOCUMENT AND CLASSIFICATIONUNABLE TO DECODE
NOMINAL THREAD DIAMETER0.3125 INCHES IN
HEAD STYLEFLAT CHAMFER
SPECIAL FEATURESSCREW SHANK .247" DIA
SURFACE TREATMENTUNABLE TO DECODE
SUBSTITUTES & CROSS-REFERENCES 1
NAS1351Same 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 B74133?
B74133 is a SCREW,PANEL FASTENER.
What parts can replace B74133?
There is 1 known substitute for B74133: NAS1351. Substitute compatibility should be verified for your specific system.
What is the NSN for B74133?
B74133 is cataloged in the U.S. Government catalog under NSN 5305-01-516-7945. 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.