Automotive Holiday Deals Books Gift Guide Books Gift Guide Shop Men's Athletic Shoes Learn more nav_sap_SWP_6M_fly_beacon Indie for the Holidays egg_2015 All-New Amazon Fire TV Beauty Gifts Gifts Under $50 Find the Best Purina Pro Plan for Your Pet Amazon Gift Card Offer bf15 bf15 bf15 $30 Off Amazon Echo Starting at $49.99 Kindle Black Friday Deals Black Friday Video Game Deals Shop Now Tikes

0 items added

To add items, choose from the table below

Image is representative of the product family. Select individual products in the table below for more specific images and product specifications
by Dormer

Dormer A345 High-Speed Steel Extra-Long Length Drill Bit, Black Oxide Finish, Morse Taper Shank, Spiral Flute, 118 Degree Point Angle

Available in multiple versions

Price: $19.66 - $486.40
Product Specifications
Brand Name Dormer
Material Type High-Speed Steel
Finish Types Black Oxide
Cutting Direction Right-Hand
Drill Point Conventional
Flute Type Spiral
Manufacturer Series Number A345
Shank Type Taper
Style Name Extra-Long Length
UNSPSC Code 20121600

The Dormer A345 extra-length, black oxide-coated, general-purpose Morse taper shank drill bit ... Read full product description

Currently showing 1-20 of 59 Next »
Size Part Number
The Amazon Standard Item Number (ASIN) uniquely identifies the item in the Amazon catalog.
Price Quantity
1 in B003JY5ZMW
1-1/4" B003JY5ZNG
1/2 in B003JY5ZO0
10.50mm B003JY5ZPO
10mm B003JY5ZOK
11.50mm B003JY5ZQS
11/16" B003JY5ZRC
11mm B003JY5ZQ8
12.50mm B003JY5ZSG
12mm B003JY5ZRW
13.50mm B003JY5ZUE
13/32" B003JY5ZUY
13mm B003JY5ZTA
14mm B003JY5ZVI
15.50mm B003JY5ZWM
15mm B003JY5ZW2
16.50mm B003JY5ZYA
16mm B003JY5ZXG
17.50mm B003JY5ZZE
17/32" B003JY5ZZO
Currently showing 1-20 of 59 Next »
Could not load your selection

We're sorry. An error occured when we tried to load your product family table. Rest assured, we're working to resolve the problem as soon as possible. Please refresh the page.

Product Features

  • Extra-length, for deeper holes
  • Morse taper shank, for a secure and accurate tool-holding system
  • 118-degree, web-thinned, conventional point angles, for reduced drilling pressure
  • Black oxide finish, for improving lubricity, resisting corrosion, and resistances to chipping or flaking
  • High-speed steel (HSS), for use on a wide variety of materials

Special Offers and Product Promotions

Product Details

  • Shipping Information: View shipping rates and policies
  • Domestic Shipping: Item can be shipped within U.S.
  • International Shipping: This item is not eligible for international shipping. Learn More
  • ASIN: B003U2SXHC
  • Manufacturer’s warranty can be requested from customer service. Click here to make a request to customer service.

Product Description

The Dormer A345 extra-length, black oxide-coated, general-purpose Morse taper shank drill bit drills holes into a wide variety of metals and synthetic materials. It can drill to a depth up to ten times the diameter of the drill size. The shank diameter is the same as the drill size.

The A345 series has a type N flute form, with a regular helix (21 to 34 degrees) angle, and performs best when drilling into magnetic soft steel or structural steel (case carburizing steel). Black oxide helps to prevent buildup and welding of material on the drill’s cutting edge when working with iron and steel. Spiral flutes act as a passageway for chip extraction from the hole and for coolant to enter the hole. Right-hand twist brings chips up and away from the cutting edge. The extra length allows for more freedom in being able to drill a wider variety of circumstances.

The principle of a Morse taper is that of the cone in the cone. The trunnion (the male portion – drill shank) and the bore (the female portion – the tool- holder) are both uniformly tapered. This system allows for torque to be transferred directly to the drill through the friction between the taper shank and the tool holder. The tang at the end of the taper is used for ejecting the drill bit from the spindle, with the aid of a drift pin.

Drilling, or hole making, is the most common metalworking operation in the world and twist drill bits are the most common type of drill bit. They can be used in hand-operated drills, standalone drill presses, or a lathe. They are made to DIN 340 industry standards, which ensure that drill bits around the world conform to the same specifications.

Together, the Precision Twist and Dormer brands represent a strong tool brand for high-productivity carbide and high-speed steel drill and tap products. Precision was founded in 1952 in Crystal Lake, IL. Dormer Tools, founded in 1913 in Sheffield, England, is known for innovative metalworking products.

Customer Reviews

There are no customer reviews yet.
5 star
4 star
3 star
2 star
1 star
Share your thoughts with other customers