Click for larger image and other views Image is representative of the product family. Select individual products in the table below for more specific images and product specifications

How can we improve our images or Product Specifications?

Cleveland 3957 6 High Speed Steel Aircraft Extension Drill Bit, 6" Overall Length, Uncoated (Bright), Round Shank, 135 Degree Split Point

Be the first to review this item

Product Specifications
Cutting Direction
Finish Types
Uncoated (Bright)
Shank Type
Material Type
High-Speed Steel
Drill Point
135 Degrees
Cutting Angle
135  Degrees
Brand Name
Flute Type

This item is no longer available

These items ship for FREE with 2-Day Shipping on orders over $50. (Details)

Want it delivered on Thu, May 7? Order in-stock items in the next 17 hrs 20 mins and choose One-Day Shipping at checkout.

  • Share
Currently showing 1-20 of 73 Next 20 »
Size name ASIN

The Amazon Standard Item Number (ASIN) uniquely identifies
the item in the (and Amazon) catalog.


If an item is currently out of stock, but has an estimated lead time, you can place an order now and we will ship it as soon as it is available.
You can also order more than we currently have in stock.
Read more about back orders in our help section.

Currently showing 1-20 of 73 Next 20 »
#1 B003Z0BPQ0 yes $51.24 Buy Options
#10 B003Z0BPLK yes $60.72 Buy Options
#11 B003Z0BPLA yes $12.67 Buy Options
#12 B003Z0BPKQ yes $12.72 Buy Options
#13 B003Z0BPK6 yes $12.69 Buy Options
#15 B003Z0BPJM yes $66.36 Buy Options
#16 B003Z0BPJC yes $12.68 Buy Options
#17 B003Z0BPJ2 yes $41.91 Buy Options
#18 B003Z0BPI8 yes $55.48 Buy Options
#19 B003Z0BPHY yes $56.76 Buy Options
#2 B003Z0BPPG yes $47.95 Buy Options
#20 B003Z0BPHO yes $49.13 Buy Options
#21 B003Z0BPHE yes $11.73 Buy Options
#22 B003Z0BPH4 yes $12.61 Buy Options
#23 B003Z0BPGK yes $12.61 Buy Options
#24 B003Z0BPGA yes $12.25 Buy Options
#25 B003Z0BPG0 yes $35.29 Buy Options
#26 B003Z0BPFQ yes $12.18 Buy Options
#27 B003Z0BPF6 yes $11.37 Buy Options
#28 B003Z0BPEM yes $12.06 Buy Options

Key Features

  • NAS 907 Rev. 14 type A standards, for use in the aerospace industry
  • 6" extended shank length, for extra reach
  • 135-degree split-point angles are self-centering, to reduce walking, good for hard material, and to reduce pressure on cutting edges
  • High-speed steel (HSS), for use on a wide variety of materials
  • Uncoated (bright), for use with a wide range of drilling materials

Product Description

The Cleveland 3957-6, 6” extended shank, high-speed steel (HSS) drill bit has a 30-degree helix angle, with a 135-degree split-point and uncoated surface treatment, which helps optimize performance in general-purpose drilling applications. Conforms to NAS 907 Rev. 14 type A specifications. The shank diameter is the same as the drill size. This drill features an extended length shank for those applications requiring a long reach.

The 3957-6 series performs best when drilling into various steels such as free-machining stainless steel, carbon steel, non-ferrous materials, and aluminum. With no coating or surface treatment, this uncoated tool can be used on a broad range of materials. Spiral flutes act as a passageway for chip extraction from the hole and for coolant to enter the hole. The twist of the flutes brings chips up and away from the cutting edge. 135-degree drill point reduces walking when starting a hole and penetrates more easily than a convention point. Round shanks allow use with a wide variety of tool holding systems. While the 3957-6 series was designed for the aircraft industry, it also works well in other industries. The extended shank provides longer reach than standard jobber-length drill bits. HSS is a common, general-purpose steel for cutting tools, offers toughness and shock resistance, and is compatible with a variety of materials.

The tolerances for various aspects of the Cleveland drill bits are: drill diameter range through 1/8” +0.0000”/-0.0005”, over 1/8” to 1/4” +0.0000”/-0.0007”, over 1/4” through 1/2” +0.0000”/-0.0010”, over 1/2” to 1” +0.0000”/-0.0012”, over 1” to 2” +0.0000”/-0.0015”, over 2” to 3-1/2” +0.0000”/-0.0020”; drill overall length and flute length #80 through 1/8” +0.1250”/-0.0626”, over 1/8” to 1/2” +0.1250”/-0.1250”, over 1/2” to 1” +0.2500”/-0.1250”, over 1” to 2” +0.2500”/-0.2500”, over 2” to 3-1/2” +0.3750”/-0.3750”; drill point angle diameter range 1/16” to 1/2” included angle 118 or 135 degrees +/-5 degrees, over 1/2” to 1 1/2” included angle 118 degrees +/-3 degrees, over 1-1/2” to 3-1/2” includes angle 118 degrees +/- 2 degrees; drill lip height diameter range 1/16” to 1/8” total indicator variation 0.0020”, over 1/8” to 1/4” total indicator variation 0.0030”, over 1/4” to 1/2” total indicator variation 0.0040”, over 1/2” to 1” total indicator variation 0.0050”, over 1” to 3 1/2” total indicator variation 0.0060”.

Drill bits are cutting tools used to make holes in a range of materials. They are used in machines such as handheld portable drills, drill presses, machining centers, and lathes. Drill bits come in a variety of types and lengths. Twist drill bits are the most common type of drill bit. They are a round, twisted shaft, end-cutting tool with two or more cutting edges and two or more flutes. Extra-long drill bits (also called extension) are twist bits with extended lengths for drilling deeper holes or greater reach. They are longer than long length bits.

Greenfield Industries manufactures tools under the brand names Cleveland, Chicago-Latrobe, Cle-Line, Vermont Tap & Die, Bassett, Putnam Tools, Geometric, Vers-O-Tool, H & G, and Acme-Fette. The company owned by Top-Eastern Group and headquartered in Seneca, SC, makes tools that meet American National Standards Institute (ANSI), National Aerospace Standard (NAS), and Deutsches Institut für Normung (DIN) standards.

How can we improve our Product Description?

Customer Reviews

There are no customer reviews yet.

Be the first to review this item

Go to the HomePage

Order by Phone
M-F 8am-10pm ET, Sat-Sun 8am-5pm ET 800-220-4242

My Account| Returns| Help

Website Feedback| Contact Us| Sell on AmazonSupply| Become an Affiliate

Privacy Notice| Conditions of Use

Follow Us 

© 2015, Inc. and its affiliates.