Screws | Hebei Wotu Fastener Manufacturing Co., Ltd.
Screws are small parts, but the wrong choice can damage panels, strip threads, loosen under vibration, or slow assembly. The main decision is not just size; it is matching the screw type, head style, thread form, point, material, and coating to the materials being fastened.
For furniture, roofing, metal panels, timber framing, and general assembly, the best screw specification starts with the joint: what material receives the thread, whether a pilot hole is used, how the head must sit, and what corrosion exposure the finished product will face.
Brand: Hengzuan Surface: blue and white zinc plated Specifications: in stock 3.5/3.9/4.2 mainstream wire diameter, rod length 16mm~80mm full size range in stock, supports nonstandard length customization; fine/coarse tooth types are available Packaging: 25kg export cartons, full pallets wrapped with film, supports neutral export packaging, private-label customization
Read More
Brand: Hengzuan Surface: color zinc plated Specifications: in stock ST5.5/ST6.3 regular diameter, rod length 19mm~75mm in stock, supports nonstandard customized, suitable for drilling steel sheet thickness 2~5mm Packaging: carton packaging, full pallets wooden pallet packaging, support neutral packaging, private-label customization
Read More
Brand: Hengzuan Surface: color zinc plated Specifications: ST4.2/ST4.6/ST4.8/ST5.5/ST6.3, length 80mm～165mm in stock Packaging: 25kg cartons, packed in whole pallets, supports neutral private-label
Read More
Brand: Hengzuan Surface: blue and white zinc plated, color zinc plated can be customized on request Specifications: in stock 4.2/4.8/5.5/6.3mm mainstream wire diameter, length 20mm~165mm full range of specifications, nonstandard rod length, drill point size can be customized Packaging: 25kg export cartons, full pallets wrapped with film, supports neutral export packaging, customer private-label customization
Read More
Brand: Wotu Surface: blue and white zinc plated, customized color zinc plated, Dacromet anti-corrosion coating available Specifications: ST5.5, ST6.3 mainstream specifications, rod length 20mm~125mm, full size range in stock, support nonstandard customization, drilling to adapt to steel sheet 2-6mm Packaging: 25kg cartons, whole wooden pallets
Read More
Brand: Hengzuan Surface: screw color zinc plated, head color nylon protective cap, multiple colors available Specifications: Chinese national standard ST5.5, ST6.3 mainstream caliber, rod length 25mm~125mm full range of specifications in stock, supports nonstandard length customization, suitable for drilling steel sheet thickness 2~6mm Packaging: 25kg cartons, full pallets packed on wooden pallets, support neutral packaging, private-label customization
Read MoreScrew selection criteria
Useful screw selection depends on the joint design: substrate material, hole preparation, head seating, driver access, corrosion exposure, and the required finish. For a purchasing review, confirm the screw type before comparing price, because two screws with the same length and diameter can perform very differently in timber, sheet metal, or board assemblies.
| Criterion | What To Check | Why It Matters | Buyer Tip |
|---|---|---|---|
| Joint materials and screw type | Identify whether the screw joins wood to wood, metal to metal, metal to wood, or a pre-drilled assembly; then compare self-tapping and self-drilling options. | The substrate determines whether the point must create its own hole, form threads, or pass through a prepared hole. A mismatch can increase installation effort or weaken thread engagement. | Ask: What are the exact materials and thicknesses of the parts being joined? |
| Diameter, length, and thread engagement | Compare the screw diameter and length with the joint thickness, required embedment, clearance, and any washers or attached hardware. | Too little engagement can reduce holding strength, while excessive length can protrude through the assembly or damage concealed parts. | Ask for a recommended size based on the full stack-up and the minimum thread engagement required in the receiving material. |
| Head style and drive recess | Match the head to the required finish and clearance, such as countersunk seating or a pan-style bearing surface; verify the drive type and bit fit. | Head geometry affects flushness, clamp distribution, access for the tool, and the risk of cam-out during installation. | Ask whether the head should sit flush, remain visible, or use a washer, and which bit is specified for production tools. |
| Point and thread form | Check whether the point and thread are intended for the substrate, including coarse threads for suitable wood applications or drilling points for selected metal assemblies. | Thread pitch and point design influence starting torque, hole formation, chip removal, and resistance to loosening or pull-out. | Ask for the recommended pilot-hole practice, if any, and the material range the point and thread are designed to enter. |
| Material and surface finish | Compare the screw material and coating with indoor, humid, exterior, or chemically exposed conditions, and check compatibility with adjacent metals. | Corrosion resistance and galvanic compatibility affect service life and the appearance of the finished joint. | Ask which environments the proposed finish is intended for and whether coating or material documentation is available for the application. |
The practical distinction many buyers need first is self-tapping versus self-drilling. A self-tapping screw forms or cuts its mating thread in a prepared hole or softer material. A self-drilling screw has a drill point that creates the hole and thread path in one operation, which can reduce steps in metal-to-metal work when the drill point suits the sheet thickness and substrate.
Head style also changes the result. A countersunk head sits flush in timber or board when the countersink is correct, while a hex head gives stronger tool engagement for roofing, steel framing, and outdoor assemblies. Choosing by length alone often creates problems: a screw can be long enough but still fail if the thread engagement, point type, or coating is wrong for the application.
Start with the materials in the joint. Wood, fiberboard, thin sheet metal, thicker steel, and metal-to-timber assemblies need different thread geometry and point designs. A coarse or thick thread may grip board well, but the same thread may not be suitable for a metal-to-metal connection. If the receiving material is hard or thin, confirm whether the screw needs a pilot hole, a self-drilling point, or a thread-forming design.
Choose the head for installation and finished appearance. Countersunk cross-head screws are common where the head must sit flush, such as furniture panels and fiberboard assemblies. Hex head screws are easier to drive with higher torque and are often preferred where access, clamping force, or outdoor fastening matters. Check the drive recess or tool interface as well; poor bit fit leads to cam-out, damaged coatings, and inconsistent tightening.
Match coating and base material to the environment. Indoor furniture screws usually face different risks than roofing screws exposed to rain, condensation, and temperature changes. A corrosion-resistant coating can help, but it must also survive installation. If the screw will fasten coated sheet metal, avoid choices that scratch the panel surface or create galvanic compatibility concerns without review.
Avoid sending only “screw size” in an inquiry. A clearer request names the application, the materials and thicknesses, the required head and drive, the thread or point type if known, the coating or finish, and any sample or drawing requirement. If you are replacing an existing fastener, provide photos and measurements of the old screw, including head diameter, overall length, thread length, and point shape.
| Criteria | Importance | Description | Example Options |
|---|---|---|---|
| Thread and point type | Usually the first technical decision | The screw must be able to enter the material, create or engage a thread, and hold without cracking, stripping, or loosening. Self-tapping, self-drilling, and wood or board threads solve different fastening problems. | A screw for fiberboard furniture may need a coarse thread, while a screw for sheet metal may need a suitable tapping or drilling point. |
| Head and drive style | Affects installation speed, appearance, and torque transfer | The head determines how the screw seats against the surface, and the drive determines how reliably the tool applies torque. Poor drive fit can damage the recess or coating. | Countersunk cross-head screws suit flush furniture assembly; hex head screws are often easier to drive where higher torque is needed. |
| Material and coating | Important when the joint faces moisture, outdoor exposure, or visible finish requirements | The base material and finish should suit the service environment and installation method. A coating must remain effective after driving and should be compatible with the joined materials. | Indoor cabinet assembly and exposed roofing panels usually call for different finish decisions. |
| Pilot hole and thread engagement | Critical for holding strength and repeatable assembly | The hole size, depth, and receiving material thickness affect whether the screw forms a secure grip. Too little engagement can loosen; too much driving force can split or strip the material. | A board assembly may need a controlled pilot hole, while some metal assemblies may use a screw designed to drill and tap in one step. |
| Replacement versus new design | Changes how much specification detail is needed | Replacing an existing screw often starts with matching dimensions and function. A new joint design should start with the materials, load expectations, head seating, and installation method rather than copying a generic size. | For a replacement, provide a sample or photo; for a new product, provide the joint drawing and material details. |
Related Options
For a real project, the priority is usually consistent assembly rather than a generic “stronger” screw. A furniture buyer may focus on countersunk heads and reliable grip in fiberboard, while a roofing or metal-panel buyer may care more about drill point performance, head style, washer compatibility, and coating durability.
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 […]
When sourcing dacromet hex head self drilling screw, a complete RFQ should define the application, screw configuration, coating requirement, dimensions, and supplier confirmation requirements. Buyers often receive different quotations because suppliers may interpret coating, size, drilling capability, or packaging scope differently. Before preparing a project inquiry, buyers can review the available fastener product categories to […]
#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: 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 […]
Use a self-tapping screw when the joint already has a prepared hole or when the receiving material can accept a formed thread. Use a self-drilling screw when the screw must create its own hole in suitable metal thickness during installation. The drill point style and the material thickness matter, so confirm those details before treating the two types as interchangeable.
No. Extra length does not help if the thread is wrong for the receiving material, the head does not seat correctly, or the point bottoms out before the joint clamps. Good holding depends on usable thread engagement, material strength, pilot hole condition, and correct tightening.
Provide the application, the two materials being fastened, material thicknesses, screw diameter and length if known, head style, drive type, point type, thread preference, and finish or coating requirement. Photos, drawings, or a sample of the current screw help avoid confusion over head diameter, thread length, and point shape.
Common causes include an oversized pilot hole, insufficient thread engagement, a thread form that does not suit the substrate, or excessive driving torque. In board and timber, the material can also break down around the thread; in sheet metal, the screw may fail to form a secure mating thread if the hole or thickness is wrong.
A countersunk head is usually chosen when the screw must sit flush with the surface, but the countersink angle and depth must match the screw. A hex head is less discreet but gives better tool engagement and is often easier to drive in construction or metal-panel work.
Send the application, the materials being fastened, and the required screw type or head style. If available, include the screw dimensions, coating requirement, and a drawing or photo of the joint.
