A truss head shoulder screw combines the wide, low-profile design of a truss head with the precision shoulder of a shoulder screw. Unlike standard shoulder screws with taller heads, the truss head provides a larger bearing surface while keeping the fastener height low.
This design helps distribute clamping force more evenly, making it suitable for thin sheet metal, plastic panels and composite parts. The smooth, rounded head profile also reduces interference in applications with limited clearance.
The precision-machined shoulder provides a controlled diameter for pivoting, sliding and locating functions, combining fastening and positioning in one component.
Compared with socket head shoulder screws, truss head designs have a lower torque capacity due to the thinner head profile. They are best suited for applications where accurate positioning and surface protection are more important than high clamp loads.
Head Profile and Drive Selection
The truss head defines this fastener's low-profile design, but the right head and drive combination depends on the application requirements.
A truss head is ideal when:
Space above the mounting surface is limited and a low-profile fastener is required.
The mating material is thin, soft or easily damaged, requiring a wider load-bearing area.
A clean, snag-resistant appearance is important for visible assemblies such as covers and panels.
Drive options:
| Drive | Best Fit | Consideration |
|---|---|---|
| Phillips / Cross | General assembly, electronics and panels | Widely available, but the shallow recess limits maximum torque |
| Hex (Allen) | Higher torque applications | Provides better torque control; commonly used with socket head designs |
| Slotted | Simple or decorative assemblies | Easy to use but offers lower torque resistance |
| Torx / Six-lobe | Applications requiring reduced cam-out | Improved torque transfer with higher tooling requirements |
For shoulder screw applications, socket head designs remain the preferred choice for high clamp loads. Truss heads are selected when low height, larger bearing area and surface protection are more important than maximum tightening torque.
Stainless Grades and Surface Treatment
Stainless steel is widely used for custom shoulder screws due to its corrosion resistance, clean appearance and suitability for precision machining. The most common grades include:
| Grade | Common Name | Application |
|---|---|---|
| 303 | Free-machining stainless steel | Ideal for CNC turning of complex geometries and high-volume production with good general corrosion resistance |
| 304 / A2 | General-purpose stainless steel | A balanced choice for indoor, food equipment and moderate outdoor applications |
| 316 / A4 | Marine-grade stainless steel | Recommended for marine, chemical and high-chloride environments requiring enhanced corrosion resistance |
Surface treatment can further improve performance and appearance. Available options include bright finish, passivation and electropolishing for improved cleanliness and corrosion resistance. The precision-ground shoulder can be finished as a smooth bearing or locating surface for direct mechanical contact.
Customising the Truss Head Shoulder Screw
KEY-CNC manufactures custom truss head shoulder screws to your drawing, with options for shoulder length, head dimensions, drive type, thread specifications and stainless steel grade. Tight tolerances can be achieved for applications requiring accurate positioning or fit.
We support prototypes, small batches and production runs, with inspection reports available for quality verification. Learn more about our process on the Quality Control page, then send your drawing and requirements through Request a Quote to discuss the right material, tolerance and finish.
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