Guhring Micro-Precision Drills HSS-Co TiN Coated

Series 301 & 660 are for use in general precision engineering, especially the instrument and clock making industries. Specially designed for drilling high alloyed steels. Manufactured to DIN1899.

For all dimensional specifications please refer to our catalogue.

Dormer HSCO Jobber Drills

A901 HSCo PFX Alcrona Top Jobber Drill
High productivity "one-hit" drilling to 6xD
Alcrona Top coating for extended tool life.
Excellent performance across a wide range of materials.
Size Range: 1.5 - 16.0mm, 1/16” - 5/8”

Dormer Stub Drills

A921
High productivity "one-hit" drilling to 3xD. Excellent performance across a wide range of materials. Parabolic flute design promotes constant chip flow. Alcrona Top coating for extended tool life
Size Range: 2.5-16.0mm. Manufactured to BS 323, DIN1897, ansi.

Guhring Jobber Drills Steam Tempered HSS

Suitable for drilling steel, cast steel, alloyed and unalloyed, grey cast iron, spheroidal iron, sintered powder metal, German silver and graphite. Manufactured to BS328/DIN338RN.

Black Finish (W-Finish)
This is the most common surface finish and is the result of a steam tempering operation in which steam is passed over the product during a controlled tempering cycle, producing a black oxide layer. Black tools are generally recommended for ferrous applications where the oxide layer aids chip flow, helps to dissipate heat by retaining some coolant on the tool surface and also helps to prevent the tool from staining.

Series 205

Guhring Production Jobber Drills HSS-Co 5%

Solid Carbide Jobber drills are especially suitable for drilling cast steels, grey cast iron, chilled cast iron, austenitic manganese steels, bronzes, light metals and non-ferrous metals. Furthermore suitable for the economic machining of abrasive materials (AlSi-alloys), fibre-reinforced plastics and other Duroplastics liable to cause severe abrasion on cutting lips and lands.

Series 5517 - Metric

Sherwood Jobber Drills Steam Tempered HSS

Suitable for drilling steel, cast steel, alloyed and unalloyed, grey cast iron, spheroidal iron, sintered powder metal, German silver and graphite. Manufactured to BS328/DIN338RN.

Black Finish (W-Finish)
This is the most common surface finish and is the result of a steam tempering operation in which steam is passed over the product during a controlled tempering cycle, producing a black oxide layer. Black tools are generally recommended for ferrous applications where the oxide layer aids chip flow, helps to dissipate heat by retaining some coolant on the tool surface and also helps to prevent the tool from staining.

Series J100

Dormer Heavy Duty Drills HSS-Co 8%

Drills up to 4 x diameter. Point angle: 135. Manufactured to BS 328, DIN 338.

Series A777 - Metric

Sherwood Extra Length Drills Steam Tempered HSS

General purpose drills for steels, cast steel, grey cast iron, malleable cast iron, nickel brass, aluminium alloy and graphite. Point angle: 118, helix angle: normal, web thickness: standard, relief angle: 10-20, tolerance of diameter: h8, tolerance of shank: f11. Manufactured to BS 328 : Part 1 : 1986.

For all dimensional specifications please refer to our catalogue.

Series E100 - Inch Sizes

Sherwood Reduced Shank Drills (Blacksmiths) - 1/2" Parallel Shank HSS

General-purpose drills for light duty work, for drilling steels, cast iron, nickel brass and graphite. Reduced parallel shank 1/2". Point angle 118, helix angle: normal, web thickness: standard, tolerance of diameter: h8, tolerance of shank: -0.01/0.08. Manufactured to BS328. Fracturing of the drill shank may occur if it is used for any other purpose or if extreme pressure is exerted on the drill.

For all dimensional specifications please refer to our catalogue.

Inch

All sizes will fit into a 13mm/1/2" chuck.

Sherwood Gauge Drills HSS Steam Tempered

General purpose drills for steels, cast steel, grey cast iron, malleable cast iron, nickel brass, aluminium alloy and graphite. Point angle: 118, helix angle: normal, web thickness: standard, relief angle: 8 - 20, tolerance of diameter: h8, tolerance of shank: f11. Manufactured to ANSI B328, BS 328 and DIN 338.

Number & Letter Gauge Drills:
Gauge drills are still in common use in the U.S. In the past, they were popular elsewhere, but now have been largely discarded in favour of metric sizes. When using a gauge rather than a standard measurement of size the user has to refer to a table of gauge sizes. For example, to drill a hole which is 10 thou (thousandth of an inch .0010) bigger than a 1/8 inch bolt, the user must first work out that 1/8 inch is 125 thou, so the hole size needed is 135 thou, and then must look up in a reference book which gauge drill bit is closest to this diameter - a number 29. Number gauge sizes are similar or equivalent in some respects to, but different from, American wire gauge. Number gauge is usually used from size 80 (the smallest) to size 1 (the largest) followed by letter gauge size A (the smallest) to size Z (the largest). Number gauge is actually defined down to size 97, but these smaller sizes are rarely encountered. It happens that as the technology for making small drill bits and drilling small holes has become more available, metric drills have become the norm.

For all dimensional and technical specifications please refer to our catalogue.

Series J100 - Gauge Sizes