M8-1.25X40 Metric Socket Set Screw Cup Point ISO 4029, DIN 916 Imported (Pack Qty 100) BC-M8040SSC

The cup point is the most popular type of set screw, designed for fast, permanent and semi-permanent location of parts on shafts with hardness differential of 10-15 Rockwell C points and where cutting in of cup edge on the shaft is acceptable Metric socket set screws shall be made from an alloy steel which conforms to the following chemical composition requirements-- Carbon: 0.19-0.50%; Phosphorous: 0.05% maximum; Sulfur: 0.05% maximum; Lead: 0.35% maximum. Set screws shall also contain one or Metric socket set screws shall be heat treated by quenching in oil from above the transformation temperature and then tempered by reheating to meet the hardness requirements listed below