shock resisting steel that offers good ductility and toughness at high hardness levels. It exhibits high strength and adequate abrasion resistance for those applications involving shock or impact loading.
22) Shock resisting steels should have
Related ISRO Technician-B Turner Question Paper - 2019 (Set-1) with Answer Key
Prevent oxides forming
Flat machining the face surface around the hole
Spot facing is a machining operation for producing a flat seat for bolt head, washer or nut at the opening of a drilled hole. The tool is called a spot facer or a spot facing tool.
Spot facing is similar to counter-boring, except that it is shallower. Tools that are used for counter-boring can be used for spot facing as well.