Import Bi-Metal Hole Saw — Buy in Bulk from Supplier in China

Hangzhou Wanrong Tools Co., Ltd. manufactures bi-metal hole saws with M3 high-speed steel teeth electron-beam welded to a spring steel body, a construction method that allows aggressive cutting action while maintaining tool flexibility and resistance to breakage under load. The variable tooth pitch design, typically 4/6 or 5/8 TPI depending on diameter, reduces vibration and harmonic chatter when cutting through mixed material stacks. These hole saws are intended for use in portable electric drills, pneumatic tools, and vertical drilling machines where rapid material removal and long tool life are required in maintenance and fabrication shops.

The M3 grade high-speed steel cutting edge provides a hardness in the range of 62 to 66 HRC after heat treatment, with a red-hardness temperature threshold around 540 degrees Celsius that supports dry or minimally lubricated cutting of structural steel, stainless steel, aluminium, wood, and thermoplastics. The spring steel body, usually 65Mn or equivalent, is heat-treated to approximately 40 to 45 HRC to absorb shock without permanent deformation. Kerf width, tooth set, and gullet depth vary with diameter, though the listing does not publish a detailed dimensional matrix. Buyers should request the cutting depth capacity, known as the cutting depth of the saw before the pilot drill or ejector spring limits operation, which typically ranges from 25 mm to 50 mm for standard bi-metal hole saws.

Primary users include mechanical contractors, plumbing and electrical installation crews, HVAC fabricators, and metalworking shops that need to create clean, circular openings for pipes, conduits, and fixture mounting. The supplier indicates compatibility with both electric and pneumatic portable tools as well as stationary drill presses. Trade terms and shipping options referenced include FOB, though the specific port is not stated, and payment mechanisms are not detailed in the source. Minimum order quantities, exact pricing, and standard lead times must be confirmed directly with Hangzhou Wanrong Tools Co., Ltd. Engineers should verify arbor compatibility and ejector spring availability for their existing drill chuck and hole saw mandrel systems.

Hangzhou Wanrong Tools Co., Ltd. is located at No.12 Dingshan Road in Wenyan Town, Hangzhou, Zhejiang Province, China, placing it within one of the country's densest clusters for hardware and cutting tool manufacturing. The supplier carries an imported tier and a harbor trust tier designation on the platform, which indicates a verified import-export profile though the depth of verification is not specified. The response rate is recorded at 0.00 percent with zero average response hours, which may reflect a recent listing update, a data collection gap, or limited engagement with platform-generated enquiries rather than operational incapacity.

No founding date, factory floor area, employee count, annual revenue, export volume, or named OEM or distributor relationships appear in the available profile. The company also does not list ISO 9001, ISO 14001, or specific product certifications such as MPA Hannover or EU safety compliance marks. Buyers should therefore request a company brochure, factory audit report, or third-party certification status directly from Hangzhou Wanrong Tools Co., Ltd. before committing to volume orders, and should consider an initial small trial shipment to evaluate tooth geometry consistency and weld integrity.