115PCS Jobber Length M35 HSS Cobalt Drill Bit Set for Hardened Steel Metal

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115PCS Jobber Length M35 HSS Cobalt Drill Bit Set for Hardened Steel Metals  Specifications
System of Measurement Inch
Drill Bit Material HSS M35 Cobalt
Drill Point Angle 135 degree Split Point
Minimum Drill Bit Size (Decimal Inch) 0.0400
Minimum Drill Bit Size (Inch) 1/16
Minimum Drill Bit Size (Letter) A
Minimum Drill Bit Size (Wire) #60
Drill Bit Finish/Coating Amber Finish
Maximum Drill Bit Size (Wire) #1
Maximum Drill Bit Size (Inch) 1/2
Maximum Drill Bit Size (Letter) Z
Number of Pieces 115
Drill Bit Size (Wire) #1 to #60
Drill Bit Size (Letter) A; B; C; D; E; F; G; H; I; J; K; L; M; N; O; P; Q; R; S; T; U; V; W; X; Y; Z
Drill Bit Size (Inch) 1/16; 5/64; 3/32; 7/64; 1/8; 9/64; 5/32; 11/64; 3/16; 13/64;
7/32; 15/64; 1/4; 17/64; 9/32; 19/64; 5/16; 21/64; 11/32;
23/64; 3/8; 25/64; 13/32; 27/64; 7/16; 29/64; 15/32;
31/64; 1/2
Step Increments (Inch) 1/64
Shank Type Straight

This cobalt jobber length drill set contains 115 drills, including sizes 1/16″-1/2″ by 1/64″ increments, letter sizes A to Z, and wire sizes #1 to #60. Cobalt steel provides extended tool life compared to high-speed steel drill bits, and are an ideal choice for drilling stainless steel. The bits feature a gold oxide finish and self-centering 135° split points. The set includes a metal case for identification and organization.

M35 Cobalt Drill Bit: Premium High Speed Steel M35 (Cobalt 5%) offers superior heat resistance and greater hardness compared to ordinary drill bits. It can extend the tool’s service life when drilling hard materials.
135° Split Point Design: The cobalt drill bit set can be used effectively on most soft and hard objects, with a 135 degree point tip with round straight shank, self-centering to prevent walk-off, make drilling precise and faster.
Efficient Drilling: Fully Ground twist design helps clear particles faster, decreases friction and heat for a cooler drilling performance.
Various Sizes: 115 sets of drill bits include 29pcs Fractional Size:1/16” to 1/2” in 1/64th increments; 26pcs Letter Size: A To Z; 60pcs Numbered Size: #1 To #60.
Widely Used: M35 Cobalt High Speed Steel is more suitable for tough, high tensile strength material. Particularly successful in cutting harden metals such as stainless steel, cast iron, high temperature alloy, titanium alloy, hard plastics and woods.
Convenient Storage: This drill tool assembly is equipped with a drill bit holder with size markings and is packaged in a compact and sturdy form, making it easy to store and categorize. If you have any questions, please contact us and we will respond within 24 hours.

Standard Countersink Angle in Different Uses
There are several countersink angles, and they all have different uses. However, below are the most common countersink angles and their uses. 90° Angled 3 Flutes Countersink Drill Bit HSS For Wood Metal Chamfering

standard countersink angle

60° (Deburring)
The primary purpose of this countersink angle is to remove burrs or sharp edges from the screw area of a metal part. After deburring, the metal has smoother edges. 6Pcs 3 Flute 90 Degree HSS Countersink Drill Bits Set For Woodworking

75° (Rivet Heads)
The rivet head angle is ideal for most rivet head types, including drive, flush, friction-lock, Oscar, self-piercing, structural steel, and solid rivets. AlTiN Single-edged Chamfer Countersink Drill Bit For Deburring Reaming Chamfering

82° and 90° (Countersunk Screw)
There are two angles for countersunk screws. However, the exact angle chosen is a function of the industry countersink screw standard. For instance, the US standard is 82°, while other countries and regions use 90° countersunk screws and the same angles.  3 Flutes Deburring Chamfering Countersink Drills Set 6Pcs

120° (Countersinking Sheet Metal Rivets)
The type of rivets used for sheet metals are the thinner and blind Rivets, often requiring a countersinking angle of 120°. This angle requirement is due to their use in joining sheet metals.  0-flute Hex Shank Countersink Drills Set For Woodworking Hole Opener

 

Size	Range	Head Size	Overall Length	Shank Diameter
5#	2-5mm	10mm	45mm	6mm
10#	5-10mm	14mm	48mm	8mm
15#	10-15mm	21mm	65mm	10mm
20#	15-20mm	28mm	85mm	12mm
25#	20-25mm	35mm	102mm	15mm
30#	25-30mm	44mm	115mm	15mm
35#	30-35mm	48mm	127mm	15mm
40#	35-40mm	53mm	136mm	15mm
50#	40-50mm	60mm	166mm	20mm