Tools > Drilling > Jobber Drill Bits & Sets > Jobber Drill Bits | Sutton Tools Jobber Drill Bits - Heavy Duty Cobalt | Descriptions | Sutton Tools Heavy Duty Cobalt jobber drills are industrial quality for drilling materials that have high hardness and tensile strength such as cast iron, bronze, hardened steel & stainless steel | These drill bits feature a thick core for increased rigidity in hard materials | Dimensions | d1 (mm): 4.7 | l1 (mm): 80 | l2 (mm): 47 | Pack Quantity: 1 | Features | 135 split point (drills > 2mm & 3/32) enables accurate positioning and less drilling pressure | Thick core for increased rigidity in hard materials | Precision engineered parallel shank for accurate hole size | Made from HSS Co. The 5% cobalt formula improves abrasive & heat resistance, for increased strength at higher cutting temperatures | Colour Tempered surface finish enables identification of cobalt tool material | Specifications | Designation: NH | Material: High Speed Steel Cobalt | Finish: Colour Temp | Maximum Cut Depth: 5XD | Shank Form: A | Helix Angle: R25 | X: als | Point Tolerance: h8 | Point Angle: 135 | Point Form: Form C>3/32 | Cutting Edges: ul | Standard: ANSI B94-11/DIN 338 | Applications | Optimal for Steel - Non-alloy, cast & free cutting (~ 0.45 %C)- 250 HB | Optimal for Steel - Non-alloy, cast & free cutting (~ 0.75 %C)- 300 HB | Optimal for Steel - Low alloy & cast < 5% of alloying elements- 275 HB | Optimal for Steel - Low alloy & cast < 5% of alloying elements- 300 HB | Optimal for Copper & Copper alloys (Brass/Bronze) - Brass (CuZn, CuSnZn)- 90 HB