19PCS HSS 4241 Straight Shank Twist Drills Bits Set with Metal Box, M35 HSS Co Twist Drill Bit Set, Combinational Drill Bit Set Screwdriver Socket Driving Accessories Kit, Jobber Length M35 HSS Cobalt Drill Bit Set for Hardened Steel Metal, 115Pcs M35 High Speed Steel Bits Set for Hardened Metals, Chamfer Countersink Deburring Drill Bits Set Cutting Metal Tool, Woodworking Metalworking & Multipurpose Drill Bits China Supplier Factory Manufacturer
19PCS HSS 4241 Straight Shank Twist Drills Bits Set with Metal Box Specifications
Material HSS 4241
Manufacturing Process Roll Forged / Full Ground
Heat Treatment Full groove length heat treatment
Point angle 135 or 118 split point
Size 1.5-6.5*0.5 mm +3.2+4.8mm
Surface Finishing amber color/coffedd color
Packaging 19pcs in metal box, then in carton
Sharp blade, fast drilling hole. Super-hard, wear-resistant.
Good toughness, wear resistance, high temperature resistant.
Suitable for iron, steel, wood and aluminum, tool steel
High Speed Steel Material: Made of HSS 4241 for super-hardness, wear resistance, and high temperature tolerance.
Versatile Drilling Capability: Suitable for iron, steel, wood, aluminum, and tool steel applications.
Customizable Process Options: Offers Roll Forged, Full Ground, or Milled processes with single or double grooves.
OEM and ODM Services: Professional design team available to build your own brand with full customization.
Comprehensive Quality Control: 100% inspection including visual and function checks before packing for shipment.
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Our drill bits are made from premium M35 cobalt steel, ensuring exceptional durability and long-lasting performance. Say goodbye to dull and worn-out bits – our cobalt drill bits are built to last! Plus, with a variety of sizes included in the set, you’ll always have the perfect drill bit for any job that comes your way.
But what sets our drill bits apart from the rest? It’s all about the high-speed drilling capabilities. Our M35 cobalt steel construction allows for quick and efficient drilling, so you can finish your projects in no time. Whether you’re working with tough materials like stainless steel, cast iron, or high-strength alloys, our drill bits will power through with ease.
So why settle for anything less than the best? Choose our Professional Grade M35 Cobalt High Speed Drill Bit Set and experience the difference for yourself. Get ready to drill with confidence and precision – order your set today! 25Pcs Bright Finish Metric Rolled Edge HSS Twist Drill Bits Set for Metal Stainless Steel Aluminium Drilling in Plastic Box
Size Charts for Typical Countersink Dimensions
Below are charts showing the typical countersink dimensions for angles 82°, 90°, and 100°.
Dimension Chart for 82° countersink angle in Inches
Fastener Size (Thread) Pilot Hole Diameter (Close Fit) Pilot Hole Diameter (Normal Fit) Pilot Hole Diameter (Loose Fit) Countersink Diameter
#0 1/15 6/79 3/32 5/42
#1 3/37 4/45 4/45 13/89 Bright High Speed Steel Jobber-Length Drills Set for Well, PCB, Metal Drilling
#2 3/32 7/69 7/62 16/93
#3 5/47 8/69 9/70 1/5
#4 3/25 9/70 14/97 9/40
#5 9/64 5/32 11/64 25/99
#6 2/13 10/59 5/27 12/43
#8 9/50 10/51 13/61 1/3
#10 15/73 21/95 5/21 5/13
#12 15/64 15/61 6/23 39/89
1/4 17/64 9/32 19/64 36/71
5/16 21/64 11/32 23/64 40/63
3/8 25/64 13/32 27/64 16/21
7/16 29/64 15/32 31/64 69/85
1/2 17/32 9/16 39/64 7/8
9/16 19/32 5/8 43/64 1
5/8 21/32 11/16 47/64 1 1/8
3/4 25/32 13/16 29/32 1 3/8
Dimension Chart for 90° Countersink Angle in Millimeters
Fastener Size (Thread) Pilot Hole Diameter (Close Fit H12) Pilot Hole Diameter (Normal Fit H13) Pilot Hole Diameter (Loose Fit H14) Countersink Diameter
M3 3.2 3.4 3.6 6.94 25PCS Bright Finished High Speed Steel Twist Drill Bits Set for Drilling Metal
M3.5 3.7 3.9 4.2 8.96
M4 4.3 4.5 4.8 9.18
M5 5.3 5.5 5.8 11.47
M6 6.4 6.6 7 13.71
M8 8.4 9 10 18.25
M10 10.5 11 12 22.73
M12 13 13.5 14.5 27.21
M16 17 17.5 18.5 33.99
M20 21 22 24 40.71
Dimension Chart for 100° Countersink Angle in Inches
Fastener Size (Thread) Pilot Hole Diameter (Close Fit) Pilot Hole Diameter (Normal Fit) Pilot Hole Diameter (Loose Fit) Countersink Diameter
#0 / 6/79 3/32 5/42
#1 3/37 4/45 8/77 13/89 15 Pcs Twist M2 HSS Drills Set with Titanium Nitride Coating and Metal Case
#2 3/32 7/69 7/62 16/93
#3 5/47 8/69 9/70 1/5
#4 3/25 9/70 14/97 9/40
#6 2/13 10/59 5/27 12/43
#8 9/50 10/51 13/61 1/3
#10 15/73 21/95 5/21 5/13
1/4 17/64 9/32 19/64 36/71
5/16 21/64 11/32 23/64 40/63
3/8 25/64 13/32 27/64 16/21
7/16 29/64 15/32 31/64 81/91
1/2 17/32 9/16 39/64 1 1/59
9/16 19/32 5/8 43/64 1 10/69
5/8 21/32 11/16 47/64 1 25/92
Reverse Twist M2 HSS Left Hand Drill Bit Set 15 Pieces
