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Technical Data Sheet
PartsTable / COMPONENT / SB 258
SB 258 ✓ Verified by PartsTable
— · COMPONENT
WHAT YOU NEED TO KNOW
Verify manufacturer and server generation compatibility Check if Option PN or Spare PN — same part, different channel
Confirm exact part number — similar PNs may be different parts
PRODUCT OVERVIEW

The PROTECTOR,HEARING is a the manufacturer industrial component. Key specifications include body_style: HEADSET, COVERED. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4240-00-691-5617, 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
SB 258
NSN: 4240-00-691-5617
FSC: 4240
CAGE: 79687 — DALLOZ SAFETY (USA)
SPECIFICATIONS
body_styleHEADSET, COVERED
NSN4240-00-691-5617
COMPONENT DIAGRAM
COMPONENT MAIN IC EDGE CONNECTOR No detailed specs available PROTECTOR,HEARING TITLE COMPONENT PN SB 258 MFR PROTECTOR,HEARING
KEY FEATURES
•
BODY STYLE: HEADSET, COVERED
TECHNICAL CHARACTERISTICS (FLIS)
BODY STYLEHEADSET, COVERED
VERIFIED SUBSTITUTES & CROSS-REFERENCES 17
L3Interchangeable
interchangeable cross-reference
interchangeable
ASTM A666Interchangeable
interchangeable cross-reference
interchangeable
CSS3Interchangeable
interchangeable cross-reference
interchangeable
SM-43Interchangeable
interchangeable cross-reference
interchangeable
52723Interchangeable
interchangeable cross-reference
interchangeable
9TQ31WInterchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is SB 258?
SB 258 is a PROTECTOR,HEARING.
What parts can replace SB 258?
There are 17 known substitutes for SB 258: L3, ASTM A666, CSS3 and 14 more. Substitute compatibility should be verified for your specific system.
Is SB 258 still available?
SB 258 is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026