Tek Screws for Metal Fastening | Hebei Wotu Fastener Manufacturing Co., Ltd.
Tek screws for metal are chosen for one main reason: the drill point, thread and head style can fasten sheet metal, steel sections or metal panels without a separate drilling step.
The right choice depends on the base metal thickness, the material being fixed, the required seating surface and the exposure conditions. A screw that drills quickly in thin sheet may be a poor fit for heavier steel or for a weather-sealed panel joint.
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 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: 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
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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 MoreSelection points
Compare tek screws for metal by drill point, thread, head, washer option, coating and intended base material. These details usually decide whether the screw drills cleanly, seats correctly and holds without damaging the panel or stripping the formed thread.
| Criterion | What To Check | Why It Matters | Buyer Tip |
|---|---|---|---|
| Drill-point style for the metal gauge | Match the screw point to the combined thickness and type of metal; verify with a drawing or sample. | A point suited to the material can reduce slipping, pre-drilling, and incomplete hole formation. | Ask, “What metal thickness range was this point designed to drill, and can you provide a sample for a trial fit?” |
| Thread design and engagement | Compare thread spacing, thread length, and the amount of engagement available after the screw passes through the outer sheet. | Too little engagement can weaken the joint, while an unsuitable thread can damage thin sheet or fail to grip securely. | Provide the metal thicknesses and ask, “How much thread should remain engaged in this assembly?” |
| Screw length and installed stack-up | Calculate the total thickness of the sheets, washer, bracket, or other parts, then confirm the usable thread length. | A screw that is too short may not hold the joint; excessive projection may interfere with nearby parts or create an installation hazard. | Send the complete layer stack and ask for the recommended length for that joint. |
| Head style and load distribution | Choose a head that suits the clearance, driver access, and bearing surface of the metal assembly; confirm whether a washer is needed. | Head geometry affects seating, clamping, pull-through risk, and access for the installation tool. | Ask, “Should this joint use a hex, pan, or another head style, and what washer arrangement is required?” |
| Corrosion protection for the service environment | Confirm the screw material and coating, then compare them with indoor, outdoor, humid, or chemically exposed conditions. | The surrounding environment can affect thread operation, appearance, and long-term joint reliability. | Describe the installation environment and ask, “Which finish is appropriate, and what compatibility information is available for the mating metal?” |
The useful distinction is between self-drilling and self-tapping screws. A tek screw is a self-drilling screw with a drill point that creates its own hole before the threads engage. A self-tapping screw forms threads in an existing or pilot hole, so it still depends on a prepared opening.
That difference matters in procurement because it affects installation speed, joint consistency and tool control. For metal-to-metal work, confirm the drill point type, thread form, head style and coating before treating two screws with the same diameter and length as interchangeable.
Start with the joint, not the screw name. Thin metal sheet, overlapping panels, steel framing and bracket fixing place different demands on the drill point and thread. The screw needs enough drilling capacity to pass through the top material and bite into the base material without stripping or spinning.
Match the head style to the contact surface. Hex washer heads suit many metal cladding and general steel applications because they give tool grip and bearing area. Countersunk or wafer heads may sit flatter, but they need a compatible recess or surface condition. For roof or wall panels, washer choice and seating pressure are as important as length.
Do not select only by overall length. Buyers often miss thread engagement, unthreaded section, washer thickness and the total stack-up of sheet, insulation, bracket or substrate. Too short can reduce holding strength; too long can leave excess projection, slow drilling or interfere with hidden components.
For an inquiry, provide the top material, base metal type and thickness, head preference, required coating or corrosion environment, and whether the joint is structural, cladding, roofing or general assembly. If the installation uses powered drivers, also confirm the bit type and any restrictions on visible head appearance.
| Criteria | Importance | Description | Example Options |
|---|---|---|---|
| Self-drilling point versus pilot-hole installation | Important when installation speed and hole preparation affect production consistency. | A self-drilling point creates the opening before the threads engage. A self-tapping alternative relies on an existing or prepared hole, so the process and tooling are different. | Use a drill-point screw for an assembly designed to be drilled and fastened in one operation; consider a tapping screw where holes are already prepared. |
| Top material, base material and thickness | Critical because drilling capacity and thread engagement must match the complete material stack-up. | Evaluate the sheet or panel being fixed, the supporting metal, any bracket or insulation layer, and the total thickness before choosing length and point style. | A thin sheet-over-frame joint and a thicker bracket-to-steel joint may require different point and thread selections even if the visible screw length appears similar. |
| Head and washer arrangement | Important for tool access, bearing area, surface appearance and weather-exposed joints. | Hex washer heads often provide tool engagement and a broad bearing surface. Countersunk or wafer heads may give a flatter finish but require a compatible surface and seating condition. | A panel joint may call for a head-and-washer combination, while a flush interior assembly may favor a lower-profile head. |
| Coating and material compatibility | Important wherever moisture, outdoor exposure or contact between dissimilar materials may affect the joint. | The finish should suit the exposure and should be considered alongside the materials being fastened. Confirm the available coating options and any compatibility information for the intended environment. | An indoor assembly and an exposed panel joint should not automatically use the same finish or washer arrangement. |
| Thread engagement and final projection | Critical for reliable holding without unnecessary penetration or interference with nearby components. | Select length from the total stack-up and the amount of thread that must engage the base material, rather than from the top sheet alone. | Include panel, bracket, washer and any intermediate layer when defining the required length; check the rear side for clearance before ordering. |
Related Options
For metal roofing or wall panel work, the priority is often sealing and consistent seating; for brackets or light steel framing, drilling capacity and thread engagement usually matter more. Sharing the actual joint stack-up makes it easier to narrow the screw type before discussing quantity or packaging.
Direct answer: Choose a self-drilling screw when the fastener must create a hole through a verified metal stack before its threads engage. Choose a self-tapping screw when the assembly already has a correctly sized pilot hole or when the selected thread is intended to form or cut into the specified substrate. The decision must also […]
Fiberboard screws are selected based on more than screw size alone. For furniture assembly and board-based applications, buyers need to match the screw structure with the characteristics of fiberboard, MDF, and similar engineered wood materials. A suitable specification should consider thread design, head style, screw length, diameter, installation method, and application requirements. For buyers sourcing […]
#4 self tapping screws should not be purchased from the “#4” designation alone. For a usable B2B specification, the buyer still needs the actual screw diameter, thread form or pitch, overall length, substrate, pilot-hole condition, head and drive style, material, surface finish and quantity. This matters because suppliers may use different naming systems. Wotu Fastener’s […]
A request for “1 1/2 self tapping screws” is incomplete until the buyer confirms what the 1 1/2 dimension refers to and how the screw will engage the base material. If 1 1/2 inch is the required overall length, that is only one part of the specification. Diameter, thread, head, drive, substrate, pilot-hole condition and […]
The correct self-tapping roofing screw depends on the complete panel-and-substrate stack-up. Steel supports typically require a point and thread matched to the support thickness and any pilot-hole requirement; timber supports require a wood-appropriate thread and sufficient embedment. In both cases, buyers must define diameter, length, head, sealing washer, material or coating, environment, pull-out requirements, and […]
Direct answer: Correct screw length does not guarantee a watertight metal-roof connection. Self tapping roofing screws can leak because of incorrect washer compression, enlarged or stripped holes, insufficient thread engagement, panel movement, or an unsuitable coating-and-washer system. Buyers should diagnose the complete installed connection—including panel profile, support thickness, point type, washer condition, and exposure—rather than […]
They can be suitable for some metal-to-wood assemblies, but the correct choice depends on the metal thickness, wood type, screw length, thread engagement and head or washer design. Confirm the full material stack-up rather than selecting a screw intended only for metal-to-metal work.
A self-tapping screw may suit an assembly that already has a pilot hole or requires a particular thread-forming process. A self-drilling screw is generally more convenient when the fastener must create its own opening, but the best option depends on the joint materials, hole preparation and installation method.
No. Holding performance depends on useful thread engagement, the thickness of the joined materials and the condition of the formed thread. An unnecessarily long screw can leave excess projection, interfere with nearby parts or complicate installation.
Check the coating against the exposure environment and the compatibility of the screw with the materials being joined. A suitable washer and controlled seating pressure also matter because the fastener must support the joint without damaging the panel or compromising the seal.
Provide the top and base material, each material's thickness, the joint type, required screw length, preferred head and washer style, installation tool and exposure conditions. Also state whether the application is roofing, cladding, framing, bracket fixing or general assembly so the drill point and thread can be assessed against the actual joint.
Send the metal thickness, the materials being joined and the preferred head or washer style. Add the exposure environment or coating requirement if the screws will be used outdoors, on roofing or in corrosive conditions.
