- Alpa Metrology FA255 (FA255348)- Manufacturer: Alpa
 - GO/NO GO threaded plug UNC ALPA FA255 In hardened steel. Tolerance 2B. Pontoglio, Italy
- Alpa Metrology FA255 (FA2553410)- Manufacturer: Alpa
 - GO/NO GO threaded plug UNC ALPA FA255 In hardened steel. Tolerance 2B. 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
- Alpa Metrology FA260 (FA26091612)- Manufacturer: Alpa
 - GO threaded rings UNC ALPA FA260 In hardened steel. Tolerance 2A. Pontoglio, Italy
- Alpa Metrology FA260 (FA260348)- Manufacturer: Alpa
 - GO threaded rings UNC ALPA FA260 In hardened steel. Tolerance 2A. Pontoglio, Italy
- Alpa Metrology FA260 (FA260540)- Manufacturer: Alpa
 - GO threaded rings UNC ALPA FA260 In hardened steel. Tolerance 2A. Pontoglio, Italy
- Alpa Metrology FA260 (FA2601224)- Manufacturer: Alpa
 - GO threaded rings UNC ALPA FA260 In hardened steel. Tolerance 2A. Pontoglio, Italy
- Alpa Metrology FA255 (FA2555811)- Manufacturer: Alpa
 - GO/NO GO threaded plug UNC ALPA FA255 In hardened steel. Tolerance 2B. Pontoglio, Italy
- Alpa Metrology FA255 (FA255440)- Manufacturer: Alpa
 - GO/NO GO threaded plug UNC ALPA FA255 In hardened steel. Tolerance 2B. Pontoglio, Italy
- Alpa Metrology FA255 (FA255832)- Manufacturer: Alpa
 - GO/NO GO threaded plug UNC ALPA FA255 In hardened steel. Tolerance 2B. Pontoglio, Italy
- Alpa Metrology FA255 (FA2551213)- Manufacturer: Alpa
 - GO/NO GO threaded plug UNC ALPA FA255 In hardened steel. Tolerance 2B. Pontoglio, Italy
- Alpa Metrology FA286 (FA286116A)- Manufacturer: Alpa
 - Threaded rings NPT ALPA FA286 Conical thread. Variation: FA286116A | Ø and pitch: 1/16" - 27 Pontoglio, Italy
- Alpa Metrology FA285 (FA285114)- Manufacturer: Alpa
 - Threaded plug NPT ALPA FA285 Conical thread. Variation: FA285114 | Ø and pitch: 1" 1/4 - 11,5 Pontoglio, Italy
- Alpa Metrology FA285 (FA285212)- Manufacturer: Alpa
 - Threaded plug NPT ALPA FA285 Conical thread. Variation: FA285212 | Ø and pitch: 2" 1/2 - 8 Pontoglio, Italy

