... surface rivet:The rivet popular used for the clutch facing , clutch disc.It's made to the GB standard, DIN 7338 standard, DIN6792 ... standard, if you have a special part we can customize to your drawing.Good and steady material choose, annealing treatmeat ... the coldheading to guarantee the rivet without the crack during the riveting, and good surface treament, to make the rivet perfect. clutch facing ...