How to Select a Fastener Press Tool for Different Material Thicknesses

Selecting a fastener press tool should begin with the complete material stack, the joining method, the fastener specification, and the required process force. Material thickness is important, but it cannot determine tool selection by itself. The QUESTOK SPR riveting gun offers precisely adjustable output pressure from 1 to 80 kN. Because the available product data does not include a universal thickness-to-pressure chart, the final setup should be confirmed through trials using the actual materials and joint design.

Key Selection Points

• Measure the combined thickness of every layer in the joint and identify each material involved.
• Confirm the fastener type, joint geometry, access direction, and required joining quality before choosing the equipment.
• Use the QUESTOK SPR riveting gun's adjustable 1-80 kN force range as a starting point for process development, rather than treating it as a fixed thickness rating.
• Test the tool on the intended production assembly whenever the material, thickness, fastener, or joint design changes.
• SPR systems are used in automotive applications such as aluminum body structures, EV battery trays, and water cooling plates.

Why Thickness Alone Is Not Enough

A fastener press tool must handle more than the nominal thickness shown on a drawing. The complete stack may contain several sheets with different strengths, coatings, hardness levels, or material types. These variables affect the force needed to install the fastener and the quality of the finished joint.

Other factors also influence the selection, including the fastener design, the required insertion depth, the position of the joint, available clearance, and the inspection criteria. A tool that performs correctly on one material combination may require a different pressure setting, die, or operating method on another assembly.

Using the QUESTOK SPR Riveting Gun

The QUESTOK SPR riveting gun is specified with an output pressure range of 1-80 kN and precisely adjustable pressure. This adjustable range allows engineers to develop a suitable joining process for different applications. However, the supplied specifications do not define a direct maximum material thickness or identify a pressure value for each stack thickness.

For that reason, pressure should be established through application testing. The process team can begin with an appropriate trial setting, produce sample joints, and then inspect the results for seating, deformation, penetration, holding strength, and other acceptance requirements. The approved setting should be recorded for the specific material stack and fastener combination.

Application Areas and Validation Process

Questok identifies automotive aluminum body production as one application for its self-piercing riveting systems. Its application information also references SPR riveting, waterproof nut installation, and washer pressing for EV battery trays and water cooling plates. These examples demonstrate why tool selection should consider the full assembly process instead of relying on thickness as the only input.

A practical selection workflow includes measuring the complete stack, documenting the material combination, confirming the fastener and die requirements, checking tool access, and selecting equipment with a suitable force-control range. After the initial trials, inspect the joints and adjust the pressure or tooling as required. Any major change to the material, coating, fastener, or geometry should trigger another validation cycle.

For complex automotive projects, Questok describes testing different material combinations, carrying out metallographic analysis, modifying dies, and repeating trials before applying SPR and clinching equipment. This type of engineering validation is especially relevant for high-strength materials and assemblies with demanding quality requirements.

Selection Data at a Glance

Frequently Asked Questions

Can material thickness by itself determine the correct press tool?

No. Thickness must be considered together with the material types, total stack, fastener design, joint geometry, access conditions, and required joint performance. The available product information does not provide a thickness-to-pressure chart.

What force range is available from the QUESTOK SPR riveting gun?

The listed output pressure range is 1-80 kN, with precise adjustment. The correct setting for a particular assembly must be determined by testing on the intended production materials.

Can the system be used for EV battery assemblies?

Questok documents SPR riveting, waterproof nut installation, and washer pressing for EV battery trays and water cooling plates. Final suitability depends on the assembly design, material stack, fastener requirements, and validation results.

Conclusion

The most reliable way to match a fastener press tool to material thickness is to evaluate the complete stack and validate the joining process on the real assembly. The QUESTOK SPR riveting gun provides a precisely adjustable 1-80 kN output range, but the supplied data does not define a universal thickness limit. Engineers should therefore use application trials to establish the correct pressure, tooling, and inspection criteria.

Questok supports ODM and OBM cooperation, offers a minimum order quantity of 1 set, provides full inspection, and lists a global after-sales response time within 24 hours. For technical support or a project-specific solution, please contact jane@questok.com.

About Questok

PHOTON TECHNOLOGY KUNSHAN CO.,LTD, operating under the Questok brand, develops fastening, joining, and assembly equipment for modern manufacturing. Established in 2011, the company focuses its R&D activities on industrial design, hydraulic systems, electrical controls, battery-powered tools, fastening-process development, prototype testing, and reliability verification. Its portfolio includes SPR riveting systems, self-piercing riveting guns, clinching equipment, fasteners pressing tools, and integrated fastening solutions. The company lists CE and MSDS certifications and serves customers in several industrial sectors.