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| Part Number | 504021-1 | 504028-1 | 504031-1 |
|---|---|---|---|
| Manufacturer | TE Connectivity AMP Connectors | TE Connectivity AMP Connectors | TE Connectivity AMP Connectors |
| Product Status | Discontinued at Digi-Key | Obsolete | Obsolete |
| Type | Coupler | Coupler | Coupler |
| Convert From (Adapter End) | ST Receptacle | FSMA Receptacle | FSMA Receptacle |
| Convert To (Adapter End) | ST Receptacle | FSMA Receptacle | FSMA Receptacle |
| Simplex/Duplex | Simplex | Simplex | Simplex |
| Mode | Singlemode/Multimode | - | - |
| Mounting Type | Panel Mount, Bulkhead | Panel Mount, Bulkhead | Panel Mount, Bulkhead |
| Housing Material | Zinc | Stainless Steel | Stainless Steel |
| Ferrule Material | Phosphor Bronze | - | - |
| Features | Dust Cap | Dust Cap | Dust Cap |
| Color | Silver | Silver | Silver |
