Silicon Bronze Flat Washers are similar to low carbon steel in hardness but offer high resistance to corrosive environments such as sea water

7/8-9 x 3 1/2 Grade 8 Hex Cap Screw Yellow Zinc Plated

3/16 Heavy Duty Jobber Drill Bit

59/64 x 6 Reduced Shank Drill Bit (1/2 Shank)

tap bolts) with all dimensions conforming to DIN 933

19/64 Cobalt Heavy Duty Jobber Drill Bit (12) 3/4-10 Hex Tap Bolts 18-8 Stainless Steel Silicon Bronze Flat Washers are19 64 Cobalt Heavy Duty Jobber Drill Bit . Heavy duty construction made to Type J aircraft specifications. Used for drilling holes in hard, tough materials such as stainless steel, titanium, high temperature and high strength alloys. High red hardness of cobalt permits speeds 30% greater than standard heavy duty split point (HSS) drills.