MAXTEC SDS Plus 2-Cutter Masonry Drill Bit - 5mm to 25mm Range

Q: What does YG8C carbide mean and why is it specified for this range?

A: YG8C is a sintered tungsten carbide grade with a higher cobalt content than standard carbide, giving it significantly better impact resistance and toughness. In SDS Plus percussion drilling, the bit tip is subjected to repeated impact forces that cause standard carbide grades to chip or fracture prematurely in hard aggregate concrete. YG8C tolerates these impact loads whilst maintaining a sharp cutting edge for longer, which reduces bit changes and lowers the cost per hole on high-volume drilling tasks.

Q: What is PGM certification and why does it matter?

A: PGM certification means the bit has been independently tested and verified for dimensional accuracy. Anchor manufacturers specify exact hole diameters and tolerances for their products: a hole that is even slightly oversize reduces the contact area between the anchor and the concrete, which directly reduces the load capacity of the installation. PGM certified bits give engineers and fixings specialists the assurance that the hole drilled meets the specification, which is particularly important on structural and safety-critical anchor installations.

Q: What is the difference between a 2-cutter and a 4-cutter SDS Plus bit?

A: A 2-cutter bit has two carbide cutting edges on the tip. A 4-cutter has four. Four-cutter bits penetrate faster and clear debris more efficiently, making them the preferred choice for very hard concrete and high-volume production drilling. Two-cutter bits offer a balance of penetration rate and tip life that suits a broader range of applications and substrates, and are generally lower in cost per bit. For most construction and infrastructure drilling tasks, a quality 2-cutter such as the MAXTEC range is the correct and most cost-effective specification.

Q: How do I choose the right length for my application?

A: The overall length must be sufficient for the drill chuck to clear the surface whilst the bit reaches the required embedment depth. As a rule, select an overall length that exceeds your required hole depth by at least 60 to 70mm to allow for the chuck body clearance. For deep chemical anchor installations, add the embedment depth to the chuck clearance and select the next available length up. The 1000mm variants are for deep foundation, infrastructure, and service penetration work only.

Q: Can I use these bits in any SDS Plus hammer drill?

A: Yes. The SDS Plus shank is a standardised system and is compatible with every SDS Plus rotary hammer drill on the market, including Hilti, Bosch, Makita, DeWalt, Milwaukee, and all other mainstream brands. No adapters are required. These bits are not compatible with SDS Max machines, which use a larger shank format.

Q: What hole cleaning is required before installing a chemical anchor?

A: Concrete dust left in the hole significantly reduces the bond strength of chemical anchor resins. After drilling, the hole must be blown out with a blow-out pump and brushed with a correctly sized wire brush, repeating the cycle three times minimum. Always follow the specific cleaning procedure in the anchor manufacturer's technical data sheet, as some products require additional steps. Skipping hole cleaning is the most common cause of anchor failures in chemical fixings.

Q: Are these bits suitable for use in reinforced concrete?

A: Yes. The YG8C carbide tip and reinforced core are specified to handle the impact encountered when the bit contacts embedded reinforcement bars. However, drilling through reinforcement is not recommended and should be avoided wherever possible. Always locate reinforcement before drilling using a rebar scanner and position holes to avoid contact with steel.

Q: How do I know when a MAXTEC SDS Plus bit needs replacing?

A: Signs include noticeably slower penetration rate, overheating at the tip, visible chipping or rounding of the carbide cutting edges, and holes that are slightly rough or oversize. For structural anchor installations, replace any bit showing these signs immediately: an oversize hole produced by a worn bit may render the anchor installation non-compliant with the design specification.

Q: Where can I order MAXTEC SDS Plus drill bits and what are the delivery options?

A: The full MAXTEC SDS Plus 2-cutter range is available at cmt.co.uk across all 46 size and length variants. CMT Group operates a fleet of over 100 vehicles covering 90% of the UK mainland, with next working day delivery on orders placed by 7pm online. VIP dedicated delivery is available UK-wide for urgent site requirements, dispatched within 30 minutes. Trade accounts and EDGE portal ordering are available for procurement teams requiring agreed pricing and full order visibility.