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