How Do Global Tool Brands Specify and Source High-Performance SDS Max Rotary Drill Bits for Rebar-Reinforced Concrete?

SDS Plus bits utilize a 10 mm diameter shank with two open retaining drive grooves and two closed ball-locking indentations, tailored for light 2-to-4 kg rotary hammers drilling holes from 4 mm to 30 mm. In sharp contrast, SDS Max features an 18 mm heavy-duty cylindrical shank engineered with three wide open drive splines and two locking notches, purpose-designed for 5-to-12 kg commercial rotary breakers generating impact energies over 15 to 25 Joules. SDS Max handles hole diameters from 12 mm up to 52 mm and lengths extending past 1,200 mm without shank deformation.

When a conventional 2-cutter masonry bit strikes internal steel rebar, its chisel edge wedges under the metal rod. This creates sudden torsional binding that snaps the carbide head or shatters the operator's wrists. A full-head 4-cutter (cross-head) carbide bit disperses the rotational impact across four balanced 90-degree cutting edges. Rather than catching, the auxiliary side cutters pulverize concrete around the bar while shaving rebar cleanly without deflection, delivering round holes crucial for code-compliant mechanical and chemical anchors.

Unlike budget suppliers using low-carbon 45# carbon steel, Jiangsu WRD Tools Co., Ltd. builds SDS Max bits using certified structural alloy steels: 40Cr (equivalent to AISI 5140) for standard contractor grades and 34CrNiMo6 (nickel-chromium-molybdenum alloy) for extreme high-impact lines. Our metallurgical heat-treatment process hardens the bit core to 48–52 HRC while maintaining a ductile core to absorb repetitive torsional flex, while induction-hardening the drive splines to 54–56 HRC to eliminate drive spline erosion.

For standard dimensions packed in standard neutral packaging, our baseline factory MOQ is 100 to 500 units per diameter. For complete private-label OEM orders—featuring custom laser etching of your brand logo, customized surface finishes (sandblasted, black oxide, titanium-gold, or duplex shot-peened), and bespoke branded blister cards or plastic storage tubes—the typical batch requirement is 500 to 1,200 pieces. Standard manufacturing production cycles range from 25 to 35 business days following sample approval.

Our Intertek-inspected quality management protocols utilize laser micrometer optical scanners and dial gauges on rotating spindles to verify total indicator reading (TIR) run-out tolerances below 0.15 mm along the entire bit length. In addition, random production bits from every batch are subjected to continuous drilling stress tests into cured C50/60 rebar-infused concrete test blocks at our onsite technical laboratory, ensuring zero carbide detachment under excessive heat and vibration.

Yes. As an authentic manufacturer with 19 years of tooling experience, our engineering department regularly designs non-standard SDS Max drill bits, including custom deep-wall bits up to 1,500 mm in total length, hollow dust-collection bits, and heavy concrete multi-tooth core bits up to 160 mm in diameter. Provide your technical CAD prints or dimensional benchmarks to our engineering desk for fast prototyping.