Tek Screws For Metal Selection Guide | Hebei Wotu Fastener Manufacturing Co., Ltd.
Tek screws for metal are typically chosen for fastening sheet metal, light-gauge steel sections, or metal components without a separate pilot hole. The main decision is whether the screw's drill point, thread form, length, head style, and corrosion protection suit the metal thickness and joint.
A suitable screw can reduce assembly steps and produce a secure joint, but the wrong point or length can leave an incomplete hole, damage the mating material, or create a weak connection.
Brand: Wotu Surface: blue and white zinc plated Specifications: Chinese national standard 6#/8#/10#/12#/16#/20#, rod length 35mm~250mm full range of specifications in stock, supports nonstandard length customization Packaging: 25kg cartons, full pallets packed on wooden pallets, support neutral packaging, private-label customization
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Brand: Wotu Surface: zinc plated Specifications: in stock M8~M64 full standard specifications, covering precision, machinery, and steel structure full size range, supporting nonstandard tooth pitch and customized thickness Matching: Can be matched with bolts of corresponding specifications, flat washer, spring washer complete set of shipment Packing: packed in 25kg cartons and packed on wooden pallets.
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Brand: Wotu Surface: zinc plated Specifications: in stockM6/M8/M10/M12/M14/M16/M20 Chinese national standardfull range of specifications, support nonstandard thickness, tooth pitch customized Matching: can be matched with bolts of the same specification, flat washer, spring washer complete set of shipment Packaging: 25kg cartons, whole wooden pallets
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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
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Brand: Hengzuan Surface: color zinc plated, customized blue-white zinc plated, black oxide Specifications: in stock 3.9/4.2/4.8/5.5 full diameter, length 13mm~75mm full size range, supports customized nonstandard rod lengths Packaging: 25kg export cartons, full pallets wrapped with film, supports neutral export packaging, customer private-label customization
Read MoreMetal screw selection criteria
Compare metal compatibility, drill-point or tapping-point design, thread engagement, screw length, head and drive style, finish, and packaging requirements. The right combination depends on the joint rather than on the general label “Tek screw.”
| Criterion | What To Check | Why It Matters | Buyer Tip |
|---|---|---|---|
| Drill point matched to metal thickness | Confirm the screw’s drill point type and the total steel thickness it is intended to drill before the threads engage. | A point that is too light can burn out or fail to drill; a point that is too aggressive may leave weak thread engagement in thinner sheet. | What metal thickness range will this tek screw drill in one pass without a pilot hole? |
| Thread form for the joint material | Compare whether the screw is intended for thin sheet, thicker steel, or metal-to-wood fastening, not just the nominal diameter. | Thread shape affects pull-out resistance, clamping, and how well the screw forms threads in the base material. | Is this screw specified for metal-to-metal fastening, or for fastening metal panels into another substrate? |
| Head style and washer choice | Match hex washer, pan, flat, or countersunk heads to the surface and required bearing area; check whether a bonded washer is needed. | The head controls load spread, appearance, tool access, and sealing. A poor match can crush panels, sit proud, or fail to seal exterior sheet work. | Do you need a low-profile finish, high driving torque, or a sealing washer under the head? |
| Coating and corrosion exposure | Ask what coating or surface treatment is available and whether it suits indoor, damp, outdoor, or chemically exposed conditions. | Tek screws for metal often fail from corrosion before the joint loses mechanical strength, especially around roofs, cladding, and exposed frames. | What environment will the screws face, and can you provide the matching coating option for that exposure? |
| Drive compatibility and installation control | Verify the drive type, recommended bit, and whether the screw is suitable for the installer’s screw gun and depth-control method. | Self-drilling screws need enough speed and pressure to drill cleanly, but overdriving can strip threads, damage washers, or deform sheet metal. | Which driver bit and installation method do you recommend for consistent seating without overdriving? |
“Tek screw” usually refers to a self-drilling screw with a drill point, while “self-tapping screw” is a broader term for a screw that forms or cuts its own thread. A self-drilling point can make sense for metal-to-metal work where drilling a pilot hole separately would add time. A self-tapping screw may be more appropriate when the metal is already pre-drilled or when the joint material and hole size have been defined.
Check the actual point design rather than relying on the name alone. The required point depends on the metal thickness, the number of layers, and whether the screw must pass through one material before engaging another.
Match the screw to the joint. Start with the metal type and thickness, then identify whether the application is metal-to-metal, metal-to-wood, or a pre-drilled assembly. Thin sheet metal and heavier sections do not place the same demands on the drill point or thread. If the screw must pass through multiple layers, allow enough length for reliable engagement without leaving an unnecessarily long projection.
Choose the point and thread deliberately. A drill-point screw is useful when it must make its own opening in the metal. A tapping-style screw may be the better choice for an existing hole or a joint where the hole size is controlled. Avoid selecting only by overall length or head diameter; thread engagement and the screw's ability to penetrate the first layer also affect the joint.
Consider the head, drive, and environment. A hex washer head can suit accessible structural or sheet-metal fastening, while a pan, wafer, or countersunk head may fit a different clearance or finish requirement. Select a drive that matches the installation tools and consider coating or material compatibility for outdoor, humid, or dissimilar-metal applications. Do not assume a bright finish provides the corrosion resistance the installation requires.
Confirm fit before ordering a production quantity. Send the metal type and thickness, joint arrangement, required head and drive, and service environment for review. Ask which point style, thread form, finish, and available dimensions are suitable, and verify the fit with representative material before committing to the full order.
| Criteria | Importance | Description | Example Options |
|---|---|---|---|
| Drill point versus tapping point | Critical for installation method | A drill point removes the need for a separate pilot hole in suitable metal applications. A tapping point is better suited to prepared holes or controlled hole sizes. | For metal panels without pilot holes, a self-drilling point may reduce installation steps; for a pre-punched bracket, a tapping screw may be more appropriate. |
| Metal thickness and layer count | Determines whether the screw can penetrate and engage properly | The screw must pass through the first layer and form a reliable connection in the receiving material. Multiple layers require more attention to point length and thread engagement. | A single thin sheet and a two-layer metal stack may need different point styles or lengths even if the head style looks the same. |
| Head and drive style | Affects installation access, clamping area, and finished appearance | Hex washer heads often provide good tool engagement and bearing area, while pan, wafer, or countersunk heads suit different clearance and finish needs. | A visible interior panel may need a lower-profile head, while an accessible sheet-metal fastening point may suit a hex washer head. |
| Finish and material compatibility | Important for corrosion resistance and service life | The environment and contact materials affect the finish choice. Indoor dry use, outdoor exposure, humidity, and dissimilar metals should not be treated the same. | A bright-finished screw may be acceptable for a dry indoor assembly but may not be suitable for exposed outdoor metalwork. |
| Length and thread engagement | Directly affects joint reliability | The screw should be long enough to drill and engage the receiving material without unnecessary projection. Overall length alone does not confirm suitability. | A screw can look long enough but still perform poorly if the threaded portion does not engage the second metal layer correctly. |
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No. The drill point must match the thickness and hardness of the metal stack. A point that works in thin sheet may fail to drill cleanly through heavier material, while an overly aggressive point can be unnecessary for light-gauge work.
Choose a self-drilling screw when the fastener needs to create its own hole in the metal during installation. Choose a self-tapping screw when a pilot hole or pre-punched hole already exists and the main requirement is forming or cutting the thread.
Not always. Strength depends on proper thread engagement, material thickness, point style, and how the joint is loaded. A screw that is too long may leave an excessive projection, interfere with nearby parts, or fail to improve holding power.
Outdoor or humid conditions usually require more attention to corrosion protection than dry indoor use. Ask which finish or material is suitable for the service environment, especially if the screw will contact dissimilar metals or be exposed to moisture.
Provide the metal type, thickness of each layer, total material stack, application, required head style, drive type, installation access, and exposure environment. If the joint is metal-to-wood or pre-drilled rather than metal-to-metal, state that clearly because it changes the suitable screw style.
Tell us the metal type and thickness, the joint materials and layer count, and whether the screws will be used indoors, outdoors, or in a corrosive environment.
