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Our adjustable counterbore drill bit is a professional-grade woodworking tool exclusively engineered for industrial buyers and professional machining teams pursuing high-precision, high-efficiency counterboring operations. As a dual-purpose 8mm & 10mm countersink drill bit for furniture hinge installation, it integrates adjustable depth control, replaceable center drill design and ultra-durable construction, perfectly solving the pain points of inconsistent countersink depth, low machining efficiency and high tool loss in furniture assembly and woodworking joinery. The main body is made of high-quality 45# steel, paired with industry-grade YG8 carbide tip, delivering stable performance even under long-term high-intensity commercial use, making it an essential tool for professional woodworking production.
The cutting core of our wood countersink bit adopts imported YG8 tungsten carbide, whose hardness and wear resistance far exceed ordinary high-speed steel, with strong impact resistance and minimal chipping risk. The main body undergoes precision CNC machining and specialized heat treatment, ensuring superior structural rigidity, negligible deformation, smooth operation and reduced vibration, which effectively extends the service life of both the drill bit and supporting machining equipment.
This adjustable depth countersink drill bit features an innovative adjustment mechanism, allowing operators to easily and precisely set the counterbore depth and diameter, with a tolerance controlled within ±0.003". It can accurately control the screw countersink depth to achieve a perfectly flush finish between the screw head and the wood surface, eliminating protrusions or recesses and ensuring a smooth, high-end appearance for finished products.
Unlike traditional integrated counterbore tools, our replaceable center drill counterbore tool eliminates the need to replace the entire expensive drill bit when the center drill is worn or damaged. Only an economical replacement center drill is required to restore the tool's optimal performance, which greatly reduces tool procurement costs for mass production enterprises and improves production continuity.
The built-in bearing-equipped limit stop adopts a zero-surface-contact design, which completely eliminates friction marks on wood and aluminum substrates during machining, ensuring a burr-free, scratch-free surface finish for every workpiece, and reducing subsequent polishing processes for commercial production lines.
Shank Size: 1/4" (6.35mm) Hex Shank
Main Body Material: 45# Steel
Carbide Tip: YG8 Tungsten Carbide
Total Length: 3-11/32" (85mm)
Working Diameter: 5/16" (8mm) & 25/64" (10mm) Dual-Purpose
Tolerance: ±0.003"
Color: Red
Packaging: Plastic Box
SKU Code | Standard Size | PACKAGING | Single Unit Weight | Package Volume |
CH339L28R | 8×2.8-10×2.8 | Plastic Box | 0.072kg | 40×40×102mm |
CH339L30R | 8×3.0-10×3.0 | Plastic Box | 0.072kg | 40×40×102mm |
CH339L32R | 8×3.2-10×3.2 | Plastic Box | 0.072kg | 40×40×102mm |
CH339L35R | 8×3.5-10×3.5 | Plastic Box | 0.072kg | 40×40×102mm |
CH339L40R | 8×4.0-10×4.0 | Plastic Box | 0.072kg | 40×40×102mm |
This hex shank counterbore drill for woodworking is tailored for professional commercial users, including furniture manufacturing factories, cabinetry production workshops, professional carpentry contractors, interior fit-out enterprises, woodworking engineering service providers, and building material wholesale distributors.
It is widely used in core woodworking scenarios such as furniture hinge installation, cabinet door assembly, custom cabinetry fabrication, wooden furniture mass production, interior decoration woodworking, wooden joinery projects, and panel furniture screw hole machining, fully meeting the high-standard machining needs of commercial production.
Personal Protective Equipment: Always wear safety goggles, dust masks and hearing protection devices during operation to avoid injury from wood chips and noise.
Pre-Operation Inspection: Before use, check that the drill bit is firmly installed, the cutting edge is intact, and there is no damage or deformation to the tool body.
Speed Regulation: Use the tool within the recommended rotational speed range, avoid over-speed operation to prevent tool breakage and work piece damage.
Worksite Safety: Keep the work area clean and tidy, avoid clutter interference, and ensure the workpiece is firmly fixed before machining.
Operation Specification: Read the machine tool operation manual thoroughly before use, and strictly follow standard machining operating procedures.
We support bulk wholesale for all models of professional carpentry counter bore tools, with a minimum order quantity of 10pcs, and drop shipping service is available for global commercial partners. We can provide customized packaging, size customization and exclusive supply solutions according to your production and sales needs. For product details, bulk pricing and sample requests, please send an inquiry through the platform, and our professional team will get back to you within 24 hours to build a long-term stable cooperative relationship with you.
