Truss Head Screw Selection | Hebei Wotu Fastener Manufacturing Co., Ltd.
A truss head screw is usually chosen when the joint needs a wide, low-profile bearing surface without using a separate washer. The broad head helps spread load over sheet metal, plastic, thin panels or light assembly parts, while the shallow dome keeps the finished surface relatively smooth.
The main decision is not only diameter and length. Buyers also need to match the head style, drive type, thread form, material and surface treatment to the substrate, installation method and service environment.
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: 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
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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: 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: 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
Read MoreSelection notes
Relevant selection criteria include the screw thread type, nominal size, usable length under the head, head diameter, head height, drive recess, material grade and surface finish. For a reliable match, confirm whether the screw is intended for sheet metal, plastic, wood-based board, metal framing or another assembled part.
| Criterion | What To Check | Why It Matters | Buyer Tip |
|---|---|---|---|
| Head diameter and bearing area | Compare the truss head diameter against the hole, slot, washer, or fixture surface it will cover. | A truss head spreads clamping force and can cover oversized or slotted holes, but a head that is too wide may interfere with nearby parts. | Ask: What head diameter is required to cover the opening without fouling adjacent components? |
| Head height and clearance | Confirm the maximum head height allowed after installation, especially under panels, covers, brackets, or moving parts. | Truss heads are lower than many pan or round heads, but they still sit proud of the surface and are not a flush countersunk option. | Ask: Is a raised head acceptable, or does the assembly need a countersunk screw instead? |
| Thread type for the base material | Match the screw thread to the receiving material, such as sheet metal, plastic, wood-based board, or a pre-tapped insert. | The same truss head can be paired with different thread forms, and the wrong thread may strip, loosen, or fail to start cleanly. | Ask: What material and thickness will the screw engage, and is the hole pre-drilled, punched, or tapped? |
| Drive style and installation tool | Specify the drive recess, such as Phillips, Pozi, Torx, or square, and confirm tool access in the assembly. | Drive choice affects cam-out, torque transfer, assembly speed, and the risk of damaging the low-profile head during tightening. | Ask: Which driver type is already used on the production line, and is there enough access for straight tool engagement? |
| Finish and service environment | Select a coating or material based on indoor use, outdoor exposure, contact with treated wood, moisture, or cosmetic requirements. | The head is visible and often exposed; the wrong finish can stain, corrode, or clash with the assembly appearance. | Ask: Will the screw be visible or exposed to moisture, and do you need a specific color or corrosion-resistant finish? |
The practical difference between a truss head screw and a pan head or countersunk screw is how the head contacts the workpiece. A truss head covers more surface area than many standard raised heads, so it can reduce pull-through risk in softer or thinner materials. A countersunk screw, by contrast, is intended to sit flush in a prepared recess and may concentrate load differently if used in thin sheet.
This matters in procurement because a screw that looks similar in length and thread can behave differently during tightening. If the application involves slotted holes, thin sheet, plastic parts or visible assemblies, confirm the head diameter, head height and required drive recess before placing an order.
Start with the material being fastened. A truss head screw for sheet metal may need a different thread form from one used in plastic, timber or pre-tapped metal. Self-tapping, machine-thread and wood-thread versions are not interchangeable, even if the head style appears the same.
Check the head and drive together. A wide truss head can improve clamping area, but the drive recess must still suit the installation tool. Phillips, cross recess, square, hex socket or other drives each affect torque control, cam-out risk and assembly speed. For production work, the drive choice can matter as much as the head shape.
Match the finish to the environment and mating material. Zinc plating, black finishes, Dacromet-type coatings, stainless steel or other treatments may be considered depending on corrosion exposure, appearance and contact with other metals. Do not select a coating only by color; confirm the required protection level and any project standard that applies.
Avoid ordering only by a short name such as “truss head screw.” Send a drawing, standard reference or sample if available, and define the thread diameter, length, head dimensions, drive type, material, finish, quantity and packaging preference. If replacing an existing fastener, include photos and note where the previous screw failed or loosened.
| Criteria | Importance | Description | Example Options |
|---|---|---|---|
| Head style | Often decisive for thin or visible assemblies | The head shape controls bearing area, surface appearance and clearance above the workpiece. Truss heads spread load over a wider area, while countersunk heads need a prepared recess and pan heads usually have a smaller bearing face. | A thin plastic cover may benefit from a broad low head, while a cabinet hinge plate may require a countersunk screw to sit flush. |
| Thread and point type | Critical for holding strength and installation reliability | The same head can be paired with different threads for sheet metal, machine threads, wood-based materials or plastics. The wrong thread may strip, loosen or fail to start cleanly. | A pre-tapped metal part may need a machine-thread screw, while a thin sheet metal joint may use a tapping or self-tapping thread. |
| Drive recess | Important for torque control and assembly speed | The drive type affects tool engagement, cam-out risk and repeatability in production. A familiar cross recess may be convenient, but another drive may be preferred if higher torque control or reduced slippage is needed. | Manual repair work may accept a common cross recess, while repetitive assembly may require a drive that works better with the selected tool. |
| Material and surface finish | Important when corrosion, appearance or material contact matters | Steel, stainless steel and coated options behave differently in humid, outdoor or decorative applications. Coating choice should be based on the required environment and project standard, not only on color. | A hidden indoor bracket may have different finish requirements from a visible panel fastener exposed to moisture. |
| Head diameter and clearance | Important when parts are thin, slotted or close to other components | A wider head improves coverage but may interfere with edges, recesses, adjacent parts or moving components. Buyers should confirm both the required bearing area and the available space around the screw location. | A slotted mounting hole may need wide head coverage, but a narrow channel may limit the maximum usable head diameter. |
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It is a good fit for thin sheet, plastic panels, brackets, appliance parts and light assemblies where the head needs to spread clamping force over a wider area. It is less suitable where the screw head must sit fully flush with the surface, because the low dome still remains visible above the material.
A truss head normally has a broader, lower-profile head than a typical pan head, so it gives more bearing area against the workpiece. A pan head may be preferred where head diameter must stay smaller or where the assembly already uses a standard pan head clearance.
Not automatically. The head style may be the same, but the thread form, point type and length need to match the material being fastened. A screw intended for sheet metal may not hold properly in plastic or wood-based board, and a wood-thread version may not suit metal parts.
A common mistake is matching only the overall length and ignoring the head diameter, drive recess and thread type. If the replacement head is too small, the joint may pull through; if it is too large or too tall, it may interfere with nearby parts or change the finished appearance.
Confirm the screw diameter, length measured from under the head, thread type, head diameter, drive type, material, finish, quantity and packaging preference. If the application has corrosion exposure, visible appearance requirements or automated assembly, include those details because they can change the recommended specification.
Please share the material being fastened, the screw size or sample drawing, and the required finish or service environment. Photos of the joint or an existing screw can also help confirm the head style and thread type.
