- Alpa Metrology FA275 (FA275238)- Manufacturer: Alpa
 - GO threaded rings GAS ISO 228 ALPA FA275 Cylindrical thread. Pontoglio, Italy
- Alpa Metrology FA275 (FA275114)- Manufacturer: Alpa
 - GO threaded rings GAS ISO 228 ALPA FA275 Cylindrical thread. Pontoglio, Italy
- Alpa Metrology FA275 (FA2751)- Manufacturer: Alpa
 - GO threaded rings GAS ISO 228 ALPA FA275 Cylindrical thread. Pontoglio, Italy
- Alpa Metrology FA265 (FA265440)- Manufacturer: Alpa
 - NO GO threaded rings UNC ALPA FA265 In hardened steel. Tolerance 2A. Pontoglio, Italy
- Alpa Metrology FA260 (FA260789)- Manufacturer: Alpa
 - GO threaded rings UNC ALPA FA260 In hardened steel. Tolerance 2A. Pontoglio, Italy
- Alpa Metrology FA260 (FA2601024)- Manufacturer: Alpa
 - GO threaded rings UNC ALPA FA260 In hardened steel. Tolerance 2A. Pontoglio, Italy
- Alpa Metrology FA260 (FA2601420)- Manufacturer: Alpa
 - GO threaded rings UNC ALPA FA260 In hardened steel. Tolerance 2A. Pontoglio, Italy
- Alpa Metrology FA260 (FA2603816)- Manufacturer: Alpa
 - GO threaded rings UNC ALPA FA260 In hardened steel. Tolerance 2A. Pontoglio, Italy
- Alpa Metrology FA255 (FA255540)- Manufacturer: Alpa
 - GO/NO GO threaded plug UNC ALPA FA255 In hardened steel. Tolerance 2B. Pontoglio, Italy
- Alpa Metrology FA255 (FA255632)- Manufacturer: Alpa
 - GO/NO GO threaded plug UNC ALPA FA255 In hardened steel. Tolerance 2B. Pontoglio, Italy
- Alpa Metrology FA255 (FA2551224)- Manufacturer: Alpa
 - GO/NO GO threaded plug UNC ALPA FA255 In hardened steel. Tolerance 2B. Pontoglio, Italy
- Alpa Metrology FA255 (FA2551126)- Manufacturer: Alpa
 - GO/NO GO threaded plug UNC ALPA FA255 In hardened steel. Tolerance 2B. Pontoglio, Italy
- Alpa Metrology FA255 (FA2551420)- Manufacturer: Alpa
 - GO/NO GO threaded plug UNC ALPA FA255 In hardened steel. Tolerance 2B. Pontoglio, Italy
- Alpa Metrology FA286 (FA286212A)- Manufacturer: Alpa
 - Threaded rings NPT ALPA FA286 Conical thread. Variation: FA286212A | Ø and pitch: 2" 1/2 - 8 Pontoglio, Italy
- Alpa Metrology FA286 (FA28618A)- Manufacturer: Alpa
 - Threaded rings NPT ALPA FA286 Conical thread. Variation: FA28618A | Ø and pitch: 1/8" - 27 Pontoglio, Italy

