25PCS Bright Finished High Speed Steel Twist Drill Bits Set for Drilling Metal, 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
25PCS Bright Finished High Speed Steel Twist Drill Bits Set for Drilling Metal Specifications
1. Material:HSS 4241,4341,6542,M35
2. Hardness:HRC 60-68
3. Process:Rolled,Polished,Fully Ground
4. Point:118/135 degree split point
5. Surface:Black Oxide,Bright,Amber finished,Ti-coated.
6. Package:Rose plastic box,Metal Box,Plastic box
7. Usage:Drilling several size hole on metal,iron,stainless steel.
[QUALITY]: This drill bit set is constructed of high speed steel with a titanium nitride coating, which give it very high surface hardness to help penetrate tough materials while highly corrosion resistant reducing friction between bit and workpiece.
19PCS Tri-Flatted Shank Black and Gold Finishing HSS M2 Bits Set in Injection Plastic Box[DESIGN]: These drill bits come with a twist design to increase cutting speed with an angled tip that is a 135 degree split point for precise self-centering and designed to cut holes faster as it prevents walking, clears chips and particles faster.[LEFT-HAND BITS]: Special left hand design can also be used with reversible drills with screw extractors to remove broken fasteners and to remove screws, bolts, and studs for home repairs, at your automotive garage, and more.[CONVENIENCE]: Each bit has an assigned hole in a drill bit holder with size index markings for quick organization and easy storage for use for home improvement or on the go in a snap.[INCLUDES]: 15 Sizes – 1/16, 3/32, 1/8, 5/32, 3/16, 7/32, 1/4, 9/32, 5/16, 11/32, 3/8, 13/32, 7/16, 15/32 and 1/2 inch bits that comes in a metal index case for easy storage. 19PCS HSS M2 Fully Ground Twist Jobber Drill Bit Set Multi-Drilling Edges Double Flute Tri-Flatted Shank
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
#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
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
#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
