** Caution: EXTERNAL Sender ** I see SAE is now SAE international. The article in Wikipedia states in an article titled SAE International:
SAE units For historical legacy reasons, the label "SAE" is commonly used on tools and hardware in North America to indicate United States customary units<https://nam10.safelinks.protection.outlook.com/?url=https%3A%2F%2Fen.wikipedia.org%2Fwiki%2FUnited_States_customary_units&data=05%7C02%7Cusma%40lists.colostate.edu%7C9f3dfd1948674376db1308dcc0438a73%7Cafb58802ff7a4bb1ab21367ff2ecfc8b%7C0%7C0%7C638596644071628735%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C60000%7C%7C%7C&sdata=UUmR8ycLCGAI5hWyI%2BMfYa6qSRepufLU3%2Fks09MSEx8%3D&reserved=0> measurements, that is, inch<https://nam10.safelinks.protection.outlook.com/?url=https%3A%2F%2Fen.wikipedia.org%2Fwiki%2FInch&data=05%7C02%7Cusma%40lists.colostate.edu%7C9f3dfd1948674376db1308dcc0438a73%7Cafb58802ff7a4bb1ab21367ff2ecfc8b%7C0%7C0%7C638596644071628735%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C60000%7C%7C%7C&sdata=gNAraZhAKfOFToJUjx5sxpbOgySdbqDUw9d1p%2FHsAVk%3D&reserved=0>-based not metric (SI)<https://nam10.safelinks.protection.outlook.com/?url=https%3A%2F%2Fen.wikipedia.org%2Fwiki%2FMetric_system&data=05%7C02%7Cusma%40lists.colostate.edu%7C9f3dfd1948674376db1308dcc0438a73%7Cafb58802ff7a4bb1ab21367ff2ecfc8b%7C0%7C0%7C638596644071628735%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C60000%7C%7C%7C&sdata=q3%2BMWK8inNvbbtiUE%2Ftrfukk9ecssZI%2FV5aCMtgtaQ8%3D&reserved=0>. Both this usage and casual use of the term "Imperial<https://nam10.safelinks.protection.outlook.com/?url=https%3A%2F%2Fen.wikipedia.org%2Fwiki%2FImperial_units&data=05%7C02%7Cusma%40lists.colostate.edu%7C9f3dfd1948674376db1308dcc0438a73%7Cafb58802ff7a4bb1ab21367ff2ecfc8b%7C0%7C0%7C638596644071628735%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C60000%7C%7C%7C&sdata=M49LsG4g%2B5qsqcng3eFwjy4PxhSE%2F%2F%2BFVaalpRc8%2FJw%3D&reserved=0>" are loose and imprecise (but common) references to inch fractional sizes and to the screw thread<https://nam10.safelinks.protection.outlook.com/?url=https%3A%2F%2Fen.wikipedia.org%2Fwiki%2FScrew_thread&data=05%7C02%7Cusma%40lists.colostate.edu%7C9f3dfd1948674376db1308dcc0438a73%7Cafb58802ff7a4bb1ab21367ff2ecfc8b%7C0%7C0%7C638596644071628735%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C60000%7C%7C%7C&sdata=HUR1ltuQh1i4ercLdhTcEWl6z6haS7GirClSW8GZwiQ%3D&reserved=0> sizes of the Unified Thread Standard<https://nam10.safelinks.protection.outlook.com/?url=https%3A%2F%2Fen.wikipedia.org%2Fwiki%2FUnified_Thread_Standard&data=05%7C02%7Cusma%40lists.colostate.edu%7C9f3dfd1948674376db1308dcc0438a73%7Cafb58802ff7a4bb1ab21367ff2ecfc8b%7C0%7C0%7C638596644071628735%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C60000%7C%7C%7C&sdata=HLaWSuGrzux7TLDcYgiCWiKI1ueE%2FqBzHB2uY2Qxe6w%3D&reserved=0> (UTS). SAE is also well known in the United States for its ratings of automobile horsepower<https://nam10.safelinks.protection.outlook.com/?url=https%3A%2F%2Fen.wikipedia.org%2Fwiki%2FHorsepower&data=05%7C02%7Cusma%40lists.colostate.edu%7C9f3dfd1948674376db1308dcc0438a73%7Cafb58802ff7a4bb1ab21367ff2ecfc8b%7C0%7C0%7C638596644071628735%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C60000%7C%7C%7C&sdata=uf6nXXZuQabywp89Rpi3ZWG1wz29vid1iorCePRHMoc%3D&reserved=0>. Until 1971–1972 SAE gross power was used. Similar to brake horsepower<https://nam10.safelinks.protection.outlook.com/?url=https%3A%2F%2Fen.wikipedia.org%2Fwiki%2FBrake_horsepower&data=05%7C02%7Cusma%40lists.colostate.edu%7C9f3dfd1948674376db1308dcc0438a73%7Cafb58802ff7a4bb1ab21367ff2ecfc8b%7C0%7C0%7C638596644071628735%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C60000%7C%7C%7C&sdata=jJaJ2dPgS6jtLBSSzOxvbbOD0HK9XmFP5q526sSaD00%3D&reserved=0> (bhp), it gave generously unrealistic performance ratings. Since then the more conservative SAE net power, which takes into account engine accessory, emissions, and exhaust drags (but not transmission losses) is the standard. Horsepower ratings SAE has long provided standards for rating automobile horsepower<https://nam10.safelinks.protection.outlook.com/?url=https%3A%2F%2Fen.wikipedia.org%2Fwiki%2FHorsepower%23Society_of_Automotive_Engineers.2FSAE_International&data=05%7C02%7Cusma%40lists.colostate.edu%7C9f3dfd1948674376db1308dcc0438a73%7Cafb58802ff7a4bb1ab21367ff2ecfc8b%7C0%7C0%7C638596644071628735%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C60000%7C%7C%7C&sdata=WaMLJc3LZcVA8w2lfuEvHFJQFt3ugDIZ0yYso388xKM%3D&reserved=0>. Until 1971–1972 SAE gross power<https://nam10.safelinks.protection.outlook.com/?url=https%3A%2F%2Fen.wikipedia.org%2Fwiki%2FHorsepower%23SAE_gross_power&data=05%7C02%7Cusma%40lists.colostate.edu%7C9f3dfd1948674376db1308dcc0438a73%7Cafb58802ff7a4bb1ab21367ff2ecfc8b%7C0%7C0%7C638596644071628735%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C60000%7C%7C%7C&sdata=zoqAVSiR17%2F2Fp51CY6G2m1DVPnS%2FL2BCeW5NY4pGAo%3D&reserved=0> was used. Similar to brake horsepower<https://nam10.safelinks.protection.outlook.com/?url=https%3A%2F%2Fen.wikipedia.org%2Fwiki%2FHorsepower%23Brake_horsepower&data=05%7C02%7Cusma%40lists.colostate.edu%7C9f3dfd1948674376db1308dcc0438a73%7Cafb58802ff7a4bb1ab21367ff2ecfc8b%7C0%7C0%7C638596644071628735%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C60000%7C%7C%7C&sdata=n0pxt96WPK%2FEKuVM6wQ4Qx68gPNtiEKgtiD%2B0sTH3MA%3D&reserved=0> (bhp), it gave generously unrealistic performance ratings. Since then, the standard has been the more conservative SAE net power<https://nam10.safelinks.protection.outlook.com/?url=https%3A%2F%2Fen.wikipedia.org%2Fwiki%2FHorsepower%23SAE_net_power&data=05%7C02%7Cusma%40lists.colostate.edu%7C9f3dfd1948674376db1308dcc0438a73%7Cafb58802ff7a4bb1ab21367ff2ecfc8b%7C0%7C0%7C638596644071628735%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C60000%7C%7C%7C&sdata=ULw1E4Isfk1fXVJtbqVIYafSu53qWXEvVNL2Pex1gmI%3D&reserved=0>, which takes into account engine accessory, emissions, and exhaust drags, but not transmission losses. Does anyone know if they still use inch/pound units or have converted to SI? Mike Payne
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