Hss Twist Drill Bits

HSS Twist Drills
　
Favorite of both the DIY and industrial markets. The general purpose, 118 degree point, ideal for portable and machine drilling. Designed to perform in low and medium carbon steel, cast iron and wood. The 135 degree split point is self-centering and reduces thrust. Ideal for portable or machine drilling of low tensile strength alloy material, stainless steel, and other medium duty applications. Available in bright finish, black oxide, titanium nitride coated, bronze color oxide. More choices for consumer.
　
Single Piece HSS Twist Drills　

DIN Standard:

DIN338, HSS Twist Drill Bits,(Rolled, Roll & Polished, Fully Ground).

DIN338, Cobalt (M35) Twist Drill Bits,( Fully Ground)

DIN1897,Short Type Drills (Fully Ground).

DIN340, Long Type Drills (Milled).

DIN1869,Long Type Drills(Milled).

HSS Double Ended Drills (Fully Gournd).

DIN338, Hex Shank Drills (Rolled, Roll & Polished, Fully Ground).

DIN338, Reduced Shank Drills.

DIN345, GB1438-85 Taper Shank Drills ( Rolled or Milled)

DIN341, GB1439 Taper Shank Drills ( Rolled or Milled)

American Standard:

Jobber Length Drills  (Rolled, Roll & Polished, Fully Ground).

Jobber Length, Cobalt (M35) Twist Drill Bits, (Fully Ground).

Screw Machine Drills  (Fully Ground).

Taper Length Drills (Fully Ground ).

12" & 18" Long Type Drills (Milled).

ASME B.94 11M - 6",12" Aircraft Extension ( Milled, Fully Ground).

Double Ended Drills (Fully Gournd).

Single Ended Drills (Fully Gournd).

Hex Shank Drills Rolled, Roll & Polished, Fully Ground).

Three Flats Shank Drills (Fully Ground)

Reduced Shank Drills

ANSI Standard Taper Shank Drills ( Rolled or Milled)
　
Usually referred to as twist drills, twist bits are probably the most common drilling tools used by the handyman with either a hand or electric drill. The front edges cut the material and the spirals along the length remove the debris from the hole and tend to keep the bit straight.
They can be used on timber, metal, plastics and similar materials. Most twist bits are made from either:
'high speed steel' (HSS), these are suitable for drilling most types of material, when drilling metal the HSS stands up to the high temperatures.
'carbon steel', these bits are specially ground for drilling wood and should not be used for drilling metals, they tend to be more brittle, less flexible than HSS bits.
Twist bits are also available coated with Titanium nitride (TiN), these are easily identified by the gold like colour. This coating increases the hardness of the bit and adds a self-lubricating property. The coating is only really effective when metal is being drilled, it has little effect when working with other materials.
Twist drills are usually available in sizes 0.8-12 mm plus. They are designed for drilling relatively small holes, they sometimes tend to clog quickly especially when the wood is 'green' so when drilling deep holes (especially in hardwood) the bits should be withdrawn regularly to remove the waste.
Special care is required when using the smallest sizes since these bits are thin and brittle. Always hold the drill square to the work and apply only light pressure when drilling.
Sharpening - use a drill sharpener, a grindstone jig or an oilstone.
Titanium nitride bits cannot be sharpened without destroying the coating (although if the drill needs sharpening, the coating will probably have already been destroyed). Forming the correct angle at the tip is important for efficient cutting.

_________________
DANYANG TONGYU TOOLS CO.,LTD.(http://www.tongyutools.com)

Export Department:

Mr. Yu Kaihzou / G. Manager

Tel: +86-511-6325949
Fax: +86-511-6333850

Email: sales@tongyutools.com
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Address:
Houxiang Town, Danyang City, Jiangsu Province, CHINA, 212312