The Protector,ear, cataloged under National Stock Number 4240-01-243-7176, is classified within Federal Supply Class 4240 (Safety and Rescue Equipment) of the Fire Fighting, Rescue, and Safety Equipment group. The manufacturer of record is Honeywell Safety Products Usa, Inc.. Government technical data includes 2 specifications, cited from the U.S. Government catalog. The record lists 3 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 7 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4240-01-243-7176 |
| Primary Part Number | RB2120 |
| Item Name | Protector,ear |
| FSC / FSG | 4240 / 42 — Safety and Rescue Equipment |
| Manufacturer | Honeywell Safety Products Usa, Inc. |
| Status | ACTIVE |
| General Characteristics Item Description | BAND TYPE; STYLE 2-POSITION,UNDER CHIN OR BEHIND HEAD,19 DECIBELS BEHIND HEAD AND 22 DECIBELS UNDER CHIN; SOFT ELLIPTICAL CUSHIONED PODS BLOSSOM OUT TO PROVIDE AN ACOUSTIC SEAL AT ENTRANCE OF EAR WITHOUT BEING INSERTED INTO EAR CANAL; PREVENTS EAR IRRITATION,LIGHTWEIGHT,COOL AND COMFORTABLE; EAR PODS ARE REPLACEABLE; FURNISHED IN A REUSABLE ZIP-LOK POLYBAG |
| Color | ORANGE |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | Possible hazard — SDS may be required (DLA HMIC P) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| RB2120 | Radians, Inc. Dba Radians Inc (USA) |
| RB2120 | Airgas Usa, Llc (USA) |
| RB2120 PRIMARY | Honeywell Safety Products Usa, Inc. (USA) |
| Reference | Meaning |
|---|---|
| QB3HYG | 5/9 Secondary reference Dalloz Safety |
| 13110056 | 5/9 Secondary reference Bilsom Intl Inc Dba Bilsom Group |
| QB3HYG | 5/9 Secondary reference Honeywell Safety Products Usa, Inc. |
| 5701 | 5/9 Secondary reference Bilsom Intl Inc Dba Bilsom Group |
| 5244T11 | 5/9 Secondary reference Mcmaster-Carr Supply Co |
| QB2HYG | 5/9 Secondary reference Honeywell Safety Products Usa, Inc. |
| 13400003 | 5/9 Secondary reference Dalloz Safety |
NSN 4240-01-243-7176 is a Protector,ear, manufactured by Honeywell Safety Products Usa, Inc., classified under FSC 4240, Safety and Rescue Equipment. Status: active.
NSN 4240-01-243-7176 has 3 manufacturer part numbers on file: RB2120 (Radians, Inc. Dba Radians Inc), RB2120 (Airgas Usa, Llc), RB2120 (Honeywell Safety Products Usa, Inc.).
2 possible matches (shared part number, not a government interchangeability claim): 4320-01-361-7716, 6515-01-727-8832. Verify interchangeability with system specifications before substitution.
Key specifications for RB2120: Overall Height: 6.00 INCHES NOMINAL IN; General Characteristics Item Description: BAND TYPE; STYLE 2-POSITION,UNDER CHIN OR BEHIND HEAD,19 DECIBELS BEHIND HEAD AND 22 DECIBELS UNDER CHIN; SOFT ELLIPTICAL CUSHIONED PODS BLOSSOM OUT TO PROVIDE AN ACOUSTIC SEAL AT ENTRANCE OF EAR WITHOUT BEING INSERTED INTO EAR CANAL; PREVENTS EAR IRRITATION,LIGHTWEIGHT,COOL AND COMFORTABLE; EAR PODS ARE REPLACEABLE; FURNISHED IN A REUSABLE ZIP-LOK POLYBAG; Overall Length: 10.500 INCHES NOMINAL IN; Overall Width: 1.500 INCHES NOMINAL IN. 2 specifications are documented in the U.S. Government catalog.
Possible hazard — SDS may be required (DLA HMIC P). Hazard information on this page is shown exactly as it appears in the DLA record.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.