- 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 FA280 (FA280118)- Manufacturer: Alpa
 - NO GO threaded rings GAS ISO 228 ALPA FA280 Cylindrical thread. Pontoglio, Italy
- Alpa Metrology FA280 (FA280214)- Manufacturer: Alpa
 - NO GO threaded rings GAS ISO 228 ALPA FA280 Cylindrical thread. Pontoglio, Italy
- Alpa Metrology FA280 (FA280212)- Manufacturer: Alpa
 - NO GO threaded rings GAS ISO 228 ALPA FA280 Cylindrical thread. Pontoglio, Italy
- Alpa Metrology FA280 (FA280234)- Manufacturer: Alpa
 - NO GO threaded rings GAS ISO 228 ALPA FA280 Cylindrical thread. Pontoglio, Italy
- Alpa Metrology FA275 (FA275212)- Manufacturer: Alpa
 - GO threaded rings GAS ISO 228 ALPA FA275 Cylindrical thread. Pontoglio, Italy
- Alpa Metrology FA275 (FA27558)- Manufacturer: Alpa
 - GO threaded rings GAS ISO 228 ALPA FA275 Cylindrical thread. Pontoglio, Italy
- Alpa Metrology FA275 (FA2752)- Manufacturer: Alpa
 - GO threaded rings GAS ISO 228 ALPA FA275 Cylindrical thread. Pontoglio, Italy
- Alpa Metrology FA265 (FA2651213)- Manufacturer: Alpa
 - NO GO threaded rings UNC ALPA FA265 In hardened steel. Tolerance 2A. Pontoglio, Italy
- Alpa Metrology FA265 (FA2651420)- Manufacturer: Alpa
 - NO GO threaded rings UNC ALPA FA265 In hardened steel. Tolerance 2A. Pontoglio, Italy

