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BG-4 — BREATHING APPARATUS,SELF-CONTAIN

✓ Government record, cited
— · COMPONENT
PRODUCT OVERVIEW

BG-4: BREATHING APPARATUS,SELF-CONTAIN.

BREATHING APPARATUS,SELF-CONTAIN. Key specifications include material: STEEL COMP 303, shank_style: STRAIGHT, shank_length: 0.271 INCHES MINIMUM AND 0.291 INCHES MAXIMUM IN, overall_depth: 0.385 INCHES MINIMUM AND 0.425 INCHES MAXIMUM IN, shank_diameter: 0.375 INCHES NOMINAL IN, inside_diameter: 0.1873 INCHES MINIMUM AND 0.1878 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5355-00-421-9954, 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
BG-4
NSN: 5355-00-421-9954
NIINs: 004219954, 011706335, 015182845
FSC: 5355 — Knobs and Pointers
CAGE: 00141 — ROLLER BEARING CO OF AMERICA, INC DIV PIC DESIGN (USA)
SPECIFICATIONS
materialSTEEL COMP 303
shank_styleSTRAIGHT
shank_length0.271 INCHES MINIMUM AND 0.291 INCHES MAXIMUM IN
overall_depth0.385 INCHES MINIMUM AND 0.425 INCHES MAXIMUM IN
shank_diameter0.375 INCHES NOMINAL IN
inside_diameter0.1873 INCHES MINIMUM AND 0.1878 INCHES MAXIMUM IN
outside_diameter0.990 INCHES MINIMUM AND 1.010 INCHES MAXIMUM IN
screw_drive_typeHEXAGON SOCKET
style_designatorROUND
attachment_methodSETSCREWS
overall_thickness0.385 INCHES MINIMUM AND 0.425 INCHES MAXIMUM IN
nominal_thread_size0.112 INCHES SCREW HOLE IN
NSN5355-00-421-9954
COMPONENT DIAGRAM
COMPONENT MAIN IC EDGE CONNECTOR No detailed specs available BREATHING APPARATUS,SELF-CONTAIN TITLE COMPONENT PN BG-4 MFR BREATHING APPARATUS,SE
KEY FEATURES
•
SHANK DIAMETER: 0.375 INCHES NOMINAL IN
•
DISTANCE FROM HOLE CENTER TO KNOB/SKIRT BASE: 0.109 INCHES NOMINAL IN
•
SHAFT ACCOMMODATION STYLE: ROUND
•
OVERALL THICKNESS: 0.405 INCHES NOMINAL IN
•
SHANK LENGTH: 0.218 INCHES NOMINAL IN
•
CRITICALITY CODE JUSTIFICATION: ZZZY
•
STYLE DESIGNATOR: ROUND
•
OUTSIDE DIAMETER: 1.000 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
SHANK DIAMETER0.375 INCHES NOMINAL IN
DISTANCE FROM HOLE CENTER TO KNOB/SKIRT BASE0.109 INCHES NOMINAL IN
SHAFT ACCOMMODATION STYLEROUND
OVERALL THICKNESS0.405 INCHES NOMINAL IN
SHANK LENGTH0.218 INCHES NOMINAL IN
CRITICALITY CODE JUSTIFICATIONZZZY
STYLE DESIGNATORROUND
OUTSIDE DIAMETER1.000 INCHES NOMINAL IN
SETSCREW HOLE QUANTITY1
NOMINAL THREAD SIZE0.112 INCHES SCREW HOLE IN
SUBSTITUTES & CROSS-REFERENCES

No substitute or cross-reference records for this part.

LIFECYCLE
NSN statusCancelled· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is BG-4?
BG-4 is a BREATHING APPARATUS,SELF-CONTAIN.
What is the NSN for BG-4?
BG-4 is cataloged in the U.S. Government catalog under NSN 5355-00-421-9954. 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.