Cleveland 3780 Cobalt Steel Jobbers' Length Drill Bit, Short Flute, Black Oxide, Round Shank, 135 Degree Split Point, 1/2" (Pack of 5) 1/2 in

Brand:Cleveland

4.1/5

55.74

The Cleveland 3780 short flute jobber length, high-speed steel (HSS) containing cobalt drill bit has a 40-degree helix angle, with a 135-degree split-point and black oxide surface treatment, which is designed for heavy-duty drilling applications. Several features such as extra heavy web for increased rigidity, high helix angle for efficient chip removal, and a preferred drill bit point geometry for drilling into work-hardened stainless steels, combined with short flutes, offer a high performance drill bit for common aircraft maintenance duties or industrial usage. Conforms to NAS 907 type D specifications. Round shanks into a wide range of tool-holders. The 3780, also known as Q-AMD Aircraft Maintenance series can be used on most materials, it is most suitable for drilling into various steels such as tool steel, steel alloys, work-hardened stainless steel and inconel. Black oxide, also called steam oxide, gives a strongly adhering blue oxide surface that acts to retain cutting fluid and prevent chip to tool welding, reducing the formation of a built-up edge. 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. The higher, also called faster helix provides greater lifting power for chips than a slower or lower helix angle. 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 3780 series was designed for the aircraft industry, it also works well in other industries. Made from HSS containing cobalt which can be run at faster speeds and stays sharp longer than HSS tools, while offering resistance to heat and abrasion. 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. Jobber drill bits are the most common length of twist bit. They offer a good compromise of length and reach to work with the widest range of materials and applications. Greenfield Industries, which are a part of Top-Eastern Group, is one of the largest manufacturers of twist drills. They also manufacture cutting tools and related products under the following brands: Cleveland, Chicago-Latrobe, Cle-Line, Vermont Tap & Die, Bassett, Putnam Tools, Geo Met RJC, H & G, Vers-O-Tool, and Acme-Fette. The company has locations around the world, and provides tools adhering to ANSI, NAS, and DIN standards.

No units available
Made in the USA. NAS 907 type D standards, for use in the aerospace industry. Jobber-length, for a wide range of applications. Black oxide finish, for improving lubricity, resisting corrosion, and resistances to chipping or flaking. High-speed steel (HSS) containing cobalt is a good combination of toughness and hardness, for use on drilling through hard substances. 135-degree split-point angles for centering and to reduce pressure on cutting edges.
Cutting Angle String 135 Degrees
Cutting Diameter 0.5 Inches
Finish Type Black Oxide
Item model number C15994
Manufacturer CLEVELAND
Material Cobalt Steel
National Stock Number 5133-01-399-1196
Product Dimensions 7.1 x 3.7 x 0.6 inches; 1.25 Pounds
Shank Type Round

4.1

4 Review
5 Star
100
4 Star
0
3 Star
0
2 Star
0
1 Star
0

Write your review

Your email will not be published. All mandatory fields are marked with*

Scritto da: Rilefos
Good quality short flute drills
It's hard to find good quality drills with short flutes--most manufacturers simply make jobber and/or screw machine varieties. But the Cleveland 3780 is welcome exception. It's a good quality drill with short flutes. These are important if you want to use them as a pilot drill for a hole-saw, or some other application where you need to modify the drill. I often find myself tapping holes in tight quarters, so it's useful to have a variety of very short hex-shank drills and use a right-angle adapter with a drill motor. But just try to find pre-made hex-shank drills in tap-drill sizes. So I make my own hex-shank drills by welding a stainless steel hex to these 3780 short flute drills. And sometimes you need a small length of rod of precise dimensions. Having a few sizes of these around means you can cut off a short piece of drill rod, and still have a usable drill left over.
Scritto da: Larry G. Evans
good price
they drill just fine, good price. Glad I bought them.
Scritto da: DavidTN
Great Product
Working well for me, AND a pack 10.
Scritto da: Absolute P.
Five Stars
Still using these each day

Related products

Discover our international network

We ship to 28 countries, over 200,000 products. Stay updated, subscribe to the newsletter.

Array