- 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
- 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 FA240 (FA2401428)- Manufacturer: Alpa
 - GO/NO GO threaded plug UNF ALPA FA240 In hardened steel. Tolerance 2B. Pontoglio, Italy
- Alpa Metrology FA235 (FA235142)- Manufacturer: Alpa
 - NO GO metric coarse pitch (M) threaded rings ALPA FA235 In hardened steel. Tolerance 6g. Pontoglio, Italy
- Alpa Metrology FA230 (FA2301115)- Manufacturer: Alpa
 - GO metric coarse pitch (M) threaded rings ALPA FA230 In hardened steel. Tolerance 6g. Pontoglio, Italy

