SDS-Max Heavy Duty

Replace your bit if you notice: (1) The carbide tip is rounded or significantly chipped, (2) The drill speed drops by more than 50% under normal pressure, (3) The hole diameter becomes undersized (cannot fit the anchor), or (4) Excessive vibration or heat during operation. A bit with a missing carbide tip must be retired immediately to prevent damage to the rotary hammer.

(1) Grease the shank: Always apply a small amount of specialized grease to the SDS-Max shank before insertion to minimize friction and wear on the tool holder. (2) Clean after use: Remove concrete dust and debris. (3) Moisture protection: Apply a light coat of anti-rust oil or WD-40 for long-term storage in humid environments. (4) Store upright: Avoid dropping bits which can cause carbide micro-fractures; use a dedicated kit box or wall rack.

Yes. Our SDS-Max bits use the standard 18 mm SDS-Max interface with three open and two closed grooves, and shank fit is checked with gauges for compatibility with Bosch (GSH/GBH series), Hilti (TE-Y), Makita (HR), DeWalt and Milwaukee rotary hammers. ISO 9001 and CE apply to our quality system and compliance documentation; SDS-Max shank fit is controlled against the 18 mm interface and gauge requirements; DIN 8039 / ISO 5468 remain straight-shank masonry-bit standards.

ZHMAX-5X (Ø12–25 mm): high-volume general construction, masonry and foundation work.
ZHMAX-7 (Ø16–45 mm): heavy reinforced concrete, deep structural holes, bridges and infrastructure, where drilling speed and holes per bit drive the decision.
ZHMAX-8 (Ø4–25 mm): full-head solid carbide for rebar-heavy drilling and precise anchor holes in hard material.
ZHMAX-168 (Ø22–45 mm): 6-cutter head for hard rock, mining blast holes and abrasive aggregate.
For continuous daily drilling of more than 4 hours, step up from ZHMAX-5X to ZHMAX-7 or ZHMAX-8.

Large-diameter SDS-Max: approximately 200 pcs per size. We confirm the final MOQ for the selected diameter, length, head construction and packaging. Production orders have a minimum total value of US$5,000. Send your size-and-quantity list; we confirm marking, custom specifications, packaging and delivery in the quotation. Lead time, paid evaluation samples and payment terms are confirmed in the quotation for the selected specification mix and destination.

Concrete is broken by impact energy per blow (rated in joules), not by RPM, so a hammer with too little single-blow energy for the diameter cannot fracture the aggregate. The bit then removes material by friction instead, which overheats and burns the carbide and stalls progress. Match each diameter to a hammer with adequate rated joules per blow — larger diameters need a higher J-class machine. If the tool bogs down and the dust runs black, the hammer is underpowered for that diameter, not the bit worn.

42CrMo body steel and YG11C carbide are strong building blocks for a heavy-impact program, but the material names alone do not define finished-bit performance. The approved specification must also align the carbide-head architecture and thickness, joining process, body heat treatment, straightness and runout, diameter and working length, and the hammer's impact energy with the target concrete and rebar exposure. Zhonghuan matches these variables in the production drawing and sample-approval plan before the OEM batch is released.

In this product specification, SDS refers to the rotary-hammer shank and tool-holder system; SDS-Max uses the standard 18 mm interface. A Safety Data Sheet is a separate material-handling document. For an RFQ, specify SDS-Max together with diameter, working length, head design, target concrete, rebar exposure, hammer model and quantity.

Send one line per SKU with diameter × working length × overall length in mm, head construction and quantity. Working length is the useful drilling reach; overall length runs from the carbide tip to the shank end. We confirm each size combination against the selected head, rotary hammer and approved drawing before quotation and sample approval.