- 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 FA235 (FA2354545)- Manufacturer: Alpa
 - NO GO metric coarse pitch (M) threaded rings ALPA FA235 In hardened steel. Tolerance 6g. Pontoglio, Italy

