- 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 FA245 (FA245356)- Manufacturer: Alpa
 - GO threaded rings UNF ALPA FA245 In hardened steel. Tolerance 2A. Pontoglio, Italy
- Alpa Metrology FA245 (FA245640)- Manufacturer: Alpa
 - GO threaded rings UNF ALPA FA245 In hardened steel. Tolerance 2A. Pontoglio, Italy
- Alpa Metrology FA245 (FA2451228)- Manufacturer: Alpa
 - GO threaded rings UNF ALPA FA245 In hardened steel. Tolerance 2A. Pontoglio, Italy
- Alpa Metrology FA245 (FA2453416)- Manufacturer: Alpa
 - GO threaded rings UNF ALPA FA245 In hardened steel. Tolerance 2A. Pontoglio, Italy
- Alpa Metrology FA245 (FA2455818)- Manufacturer: Alpa
 - GO threaded rings UNF ALPA FA245 In hardened steel. Tolerance 2A. Pontoglio, Italy
- Alpa Metrology FA245 (FA245448)- Manufacturer: Alpa
 - GO threaded rings UNF ALPA FA245 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

