Dormer A108 Series HSS Twist Drill Bit, 4.2mm Diameter, 75 mm Overall

Introducing the A108 series of high-quality, industrial HSS Split-Point Jobber Drill Bits from Dormer. The professional Drill Bits have been manufactured from premium-quality, tempered HSS steel. Drill Bits have been specifically designed for stainless steel machining and feature 135° point angle for maximum accuracy and precise application. Easy to read size markings are engraved on the side of each drill bit. Drill's helix has been redesigned for greater stiffness. Dormer A108 professional general-purpose drills are suitable for both hand and machine use and are ideal for drilling into austenitic stainless steel, cast steel, grey cast iron, malleable cast iron, nickel-brass, aluminium alloy and graphite, plastic etc. (Not suitable for masonry applications).

Dormer A108 series drill bits are available in size range from 1 mm up to 13mm:
• A108 HSS jobber drill 1mm - 794-7498
• A108HSS jobber drill 1.5mm - 794-7492
• A108 HSS jobber drill 2mm - 794-7502
• A108 HSS jobber drill 2.5mm - 794-7505
• A108 HSS jobber drill 3mm - 794-7509
• A108 HSS jobber drill 3.3mm - 794-7518
• A108 HSS jobber drill 3.5mm - 794-7511
• A108 HSS jobber drill 4mm - 794-7515
• A108 HSS jobber drill 4.2mm - 794-7524
• A108 HSS jobber drill 4.5mm - 794-7527
• A108 HSS jobber drill 5mm - 794-7521
• A108 HSS jobber drill 5.5mm - 794-7530
• A108 HSS jobber drill 6mm - 794-7533
• A108 HSS jobber drill 6.5mm - 794-7537
• A108 HSS jobber drill 6.8mm - 794-7546
• A108 HSS jobber drill 7mm - 794-7549
• A108 HSS jobber drill 7.5mm - 794-7543
• A108 HSS jobber drill 8mm - 794-7552
• A108 HSS jobber drill 8.5mm - 794-7555
• A108 HSS jobber drill 9mm - 794-7559
• A108 HSS jobber drill 9.5mm - 794-7568
• A108 HSS jobber drill 10mm - 794-7561
• A108 HSS jobber drill 10.2mm - 794-7565
• A108 HSS jobber drill 11mm - 794-7574
• A108 HSS jobber drill 12mm - 794-7577
• A108 HSS jobber drill 13mm - 794-7571

• Features self-centring split-point for excellent positional accuracy and hole quality
• Quick spiral helix enables rapid swarf removal
• Drills up to 4xDiameter in steel, stainless, cast iron, plastics and many other materials with ease
• Blue surface treatment
• Suitable for both hand and machine use
• 135° point angle design for maximum accuracy of application

• DIN338RN
• ISO235
• BS328

These bits are ideal for fast drilling of a plug, anchor or clearance holes in a number of materials such as steel, plastic, wood, metal etc. This makes it an essential piece of kit to have if you work within the carpentry/construction/engineering industries to save time and money on being able to perform more efficiently when working with stubborn materials.

Can these drill bits be used with any SDS drill?
No, they are standard drills, will not fit into SDS chuck

What does jobber mean?
The word jobber specifies the length of the drill bit. This generally means the length of the entire drill bit itself is significantly longer for diameter it has. As an example, a mechanic drill bit will have a much shorter flute and therefore have a much smaller overall length.

What is HSS?
An acronym for High-speed steel, HSS is generally the go-to type of steel needed for drill bits due to their excellent heat resistance at high speeds. As a standard drill can spin upwards of around 500 - 700rpm, the friction can cause a substantial build-up of heat. Something which would not be wanted when working with wood and plastic.