Drill Bits | Hebei Wotu Fastener Manufacturing Co., Ltd.
Choosing a drill bit starts with the material it must cut and the tool that will drive it. A bit for mild steel, stainless steel, wood, masonry or composite material needs a different cutting design, material and point geometry to produce a clean hole without unnecessary wear.
If your application actually involves fastening sheet metal, check whether you need a drill bit or a self-drilling screw. The right choice can remove a separate drilling step, but it depends on the joint design, material thickness and required finish.
Brand: Hengzuan Surface: blue and white zinc plated, optional color zinc plated, black oxide treatment Specifications: in stock ST3.5/ST4.2/ST4.8 mainstream specifications, rod length 16~50mm full size range, supports nonstandard length customization, suitable for drilling steel sheets 2~5mm Packaging: 25kg cartons, full pallets packed on wooden pallets, support neutral packaging, private-label customization
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Brand: Hengzuan Surface: high temperature black phosphated anti-rust treatment, blue zinc, color zinc plated coating can be replaced as needed Specifications: in stock ST3.5/ST4.2/ST4.8 common specifications, rod length 16mm~50mm, complete, supports nonstandard size customization, suitable for drilling steel sheets 2~5mm Packaging: 25kg cartons, whole wooden pallets, support neutral packaging, private-label customization
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Brand: Hengzuan Surface: blue and white zinc plated, can be customized color zinc plated, black oxide plated Specifications: Comply with GB/T15856.2 Chinese national standard, in stock ST3.5/ST4.2/ST4.8/ST5.5 mainstream wire diameter, rod length 13mm~50mm full range of specifications, nonstandard length customization on demand, drilling applicable plate thickness 2~5mm Packaging: 25kg export cartons, full pallets wrapped with film, supports neutral export packaging, private-label customization
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Brand: Hengzuan Surface: Color zinc plated, optional blue-white zinc plated, black oxide treatment Specifications: Chinese national standard ST4.2/ST4.8/ST5.5 specifications, rod length 13~50mm in stock, supports nonstandard length customization Packaging: 25kg export cartons, full wooden pallets wrapped with film, supports neutral packaging, private-label customization
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Brand: Hengzuan Surface: blue and white zinc plated, can be customized color zinc plated, black oxide plated Specifications: Comply with GB/T15856.2-2002 Chinese national standard, in stock ST4.2/ST4.8/ST5.5 full range of specifications, length 13mm~75mm optional, supports customized nonstandard rod lengths; drilling adaptation plate thickness 0.7~6mm Packaging: 25kg export cartons, full pallets wrapped with film, supports neutral export packaging, customer private-label customization
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Brand: Hengzuan Surface: blue and white zinc plated, can be customized color zinc plated, black oxide plated Specifications: in stock 3.5/3.9/4.2/4.8/5.5 mainstream wire diameter, rod length 13mm~75mm full size range, nonstandard length can be customized as needed Packaging: 25kg export cartons, full wooden pallets wrapped with film, supports neutral export packaging, private-label customization
Read MoreDrill bit selection criteria
Relevant selection criteria include workpiece material, hole diameter, bit material, point and flute geometry, shank style, overall reach and compatibility with the drilling tool. Ask which materials and applications the proposed item is intended for, and confirm whether the supplier offers drill bits, self-drilling screws or only related fastener products.
| Criterion | What To Check | Why It Matters | Buyer Tip |
|---|---|---|---|
| Bit type for the material being drilled | Match the drill bit style to the workpiece, such as metal sheet, structural steel, wood, plastic, or masonry. | A bit that suits the wrong material can wander, overheat, dull quickly, or leave a poor hole for the fastener. | What material and thickness will the bit drill before the screw or bolt is installed? |
| Hole size versus fastener requirement | Confirm the required pilot hole or clearance hole diameter for the fastener being used. | An undersized hole can split material or overload the fastener; an oversized hole can reduce thread engagement or clamping strength. | Is the hole meant for thread forming, clearance, countersinking, or a pre-drilled assembly? |
| Drill point geometry and centering | Look at the point style, cutting lips, and whether the bit is suitable for starting cleanly without excessive walking. | Poor centering affects hole position, especially on metal panels, brackets, and visible assemblies. | Will the bit start on a flat surface, a curved surface, or through a punched location? |
| Coating and corrosion conditions | Ask whether the bit or drilling fastener needs a surface treatment suited to storage, jobsite moisture, or outdoor exposure. | Coating affects rust resistance and can also influence heat build-up and service life during repeated drilling. | Will the drilled joint be used indoors, outdoors, or in a humid or corrosive environment? |
| Compatibility with drill speed and tooling | Confirm the intended drill driver, speed range, chuck fit, and whether the application uses hand tools or production equipment. | Even a suitable bit can fail early if used with the wrong speed, excessive pressure, or unstable tooling. | What tool will drive the bit, and is the job occasional installation or repeated production drilling? |
A drill bit makes a hole for a separate fastener, while a self-drilling screw combines a drilling point with the fastener. Use a conventional bit when you need controlled hole size, a prepared hole or compatibility with a particular bolt, rivet or screw. Consider a self-drilling screw for suitable sheet-metal assemblies where drilling and fastening in one operation is more practical.
The distinction matters because a bit is selected mainly for cutting performance and hole quality, whereas a self-drilling screw must also provide the required thread engagement, head style, coating and joint hold. Confirm the complete assembly rather than choosing from the drilling point alone.
Start with the workpiece. General-purpose high-speed steel may suit many ordinary metal-drilling tasks, while harder or abrasive materials can require a more wear-resistant bit design. Wood, masonry and metal also need different point and flute arrangements; using a metal bit for masonry or a general-purpose bit for demanding stainless steel work can lead to poor holes and short service life.
Match the bit to the machine and access conditions. Check the shank style, chuck compatibility, available tool clearance and the required hole diameter. A longer bit may reach a recessed location but can flex more; a shorter, more rigid bit can support better control where access allows.
Consider the result required, not only whether the bit can penetrate. Hole location, burr control, repeatability, surface damage and expected service life may matter more than the lowest purchase price. For repeated production work, ask how the bit is intended to perform across the stated material and whether the cutting geometry suits the available equipment.
Before requesting a quotation, send the workpiece material and thickness, required hole diameter, tool or chuck type, application volume and any surface-finish requirement. If the intended product is a self-drilling screw rather than a separate bit, include the joint materials and fastening purpose so the supplier can confirm the appropriate product category.
| Criteria | Importance | Description | Example Options |
|---|---|---|---|
| Workpiece material | Usually the first decision factor | The bit design should match the material being cut. Wood, masonry, mild steel, stainless steel and composite materials do not respond the same way to the same cutting edge and flute design. | A bit used for occasional wood holes may not be suitable for repeated holes in stainless steel. |
| Hole quality versus speed | Important when the hole affects fit or appearance | Some applications value fast penetration, while others require controlled diameter, reduced burrs or a clean visible surface. The best choice depends on the finished assembly, not only drilling time. | A prepared hole for a bolt or rivet may need better diameter control than a rough access hole. |
| Separate drilling versus self-drilling fastening | Critical if the task is part of an assembly process | A drill bit only creates the hole. A self-drilling screw drills and fastens in one operation, but it must suit the joint material, thickness and holding requirement. | Sheet-metal assembly may justify checking a self-drilling screw, while a machined part needing a precise hole may require a separate bit. |
| Tool and shank compatibility | Practical requirement before purchase | The bit must fit the available chuck or holder and suit the drilling equipment. Access space, tool speed range and rigidity can affect the final result. | A bit with the wrong shank style may not fit the tool even if the diameter is correct. |
| Reach and rigidity | Important for recessed holes or tight work areas | Longer bits improve reach but can reduce control. Shorter bits are often more stable, provided the tool can reach the drilling position. | A maintenance job inside a frame may require extra reach, while bench drilling may favor a shorter, more rigid bit. |
Related Options
For a production line making repeated holes in a defined material, the main priority is consistent hole quality and tool compatibility rather than a general-purpose description. For maintenance or mixed-material work, a versatile bit may be more convenient, but the trade-off can be less suitable performance on a specific difficult material.
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Choose a separate bit when the hole size, location or finish must be controlled before inserting a fastener. A self-drilling screw may be more efficient for suitable sheet-metal joints, but it must be selected for thread engagement, head style, coating and the materials being joined.
A general-purpose bit can be useful for light, mixed maintenance work, but it is usually a compromise. Metal, wood and masonry place different demands on the point, flute and cutting action, so production work or difficult materials usually need a bit designed for that material.
A common mistake is choosing only by diameter and ignoring material hardness, thickness and machine setup. The bit may enter the workpiece but still produce excessive burrs, poor alignment, short life or inconsistent holes if the geometry and material grade are not suitable.
Not always. A longer bit can reach recessed or obstructed positions, but it may flex more and be harder to control; a shorter bit is generally more rigid when access allows.
Share the workpiece material, material thickness, required hole diameter, drilling tool or chuck type, access limitations and expected quantity of holes. If the application is fastening rather than only hole-making, also describe the joint materials and whether a self-drilling screw is being considered.
Tell us the workpiece material and thickness, required hole diameter, and the drilling tool or chuck you will use. If you need a self-drilling screw instead, include the materials being joined and the fastening application.
