FAQs about Heavy Duty Quarter Turn Clamps
Clamping force refers to the force generated when the cam groove moves along the balls inside the receptacle, compressing the spring and pulling the plate inward.
Because this product uses a spring clamping mechanism, a gap may occur if a tensile load exceeding the clamping force is applied. Therefore, the holding force should be considered equal to the clamping force.
Tensile strength refers to the maximum load that the clamp can withstand when the plate is pulled away from the base.
Please refer to the technical data of each product below for details.
| Series | Size | Clamping Force (N) | Tensile Strength at Failure (N) | Max. Gap Between Plates (mm) |
|---|---|---|---|---|
| QCTH QCTHL QCTHH |
0525-10 | 60 | 1200 | 1.5 |
| 0834-14 | 90 | 2600 | 1.2 | |
| 0834-20 | ||||
| QCTHA | 0525-10 | 60 | 1200 | 0.7 |
| 0834-14 | 90 | 400 | 1.1 | |
| QCTHA-SUS | 0525-10 | 60 | 1200 | 0.7 |
| 0834-14 | 90 | 1.1 | ||
| QCTHS QCTHS-S |
0825-20 | 250 | 1100 | 1.0 |
| 0834-20 | 400 | 1600 | 1.5 | |
| QCTHSA QCTHSA-S |
0825-20 | 250 | 1600 | 1.2 |
| 0834-20 | 400 |
Yes.
This product can be used in applications subject to offset (moment) loads.
Please refer to the PDF below for guidelines on load calculations, gap generation, and precautions regarding product failure before determining suitability.
No.
The Mechanical Strength values do not include a safety factor.
These values represent the load levels at which failure can occur and should not be considered allowable loads.
| Series | Size | Shear Strength at Failure (N) | Tensile Strength at Failure (N) |
|---|---|---|---|
| QCTH QCTHL QCTHH |
0525-10 | 1800 | 1200 |
| 0834-14 | 3200 | 2600 | |
| 0834-20 | |||
| QCTHA | 0525-10 | 1800 | 1200 |
| 0834-14 | 3200 | 400 | |
| QCTHA-SUS | 0525-10 | 1800 | 1200 |
| 0834-14 | 3200 | ||
| QCTHS | 0825-20 | 4800 | 1100 |
| 0834-20 | 1600 | ||
| QCTHSA | 0825-20 | 3000 | 1600 |
| 0834-20 |
Operating torque refers to the torque required to turn the knob to the ON/OFF position.
Please refer to the table below for the typical operating torque.
| Series | Size | Operating Torque (N·m) |
|---|---|---|
| QCTH QCTHL QCTHH |
0525-10 | 0.4 |
| 0834-14 | 0.5 | |
| 0834-20 | ||
| QCTHA QCTHA-SUS |
0525-10 | 0.4 |
| 0834-14 | 0.5 | |
| QCTHS | 0825-20 | 0.6 |
| 0834-20 | 1 | |
| QCTHSA | 0825-20 | 0.6 |
| 0834-20 | 1 |
Durability testing is conducted under no-load conditions, focusing on repeated clamping and unclamping of the clamper.
The results of the durability tests are shown below for reference when evaluating product suitability.
| Series | Durability Test Cycles |
|---|---|
| QCTH | 30,000 cycles |
| QCTHL | |
| QCTHH | |
| QCTHA | |
| QCTHS | |
| QCTHSA |
The ON/OFF position of the clamp is determined by the mounting orientation of the clamp and the receptacle.
Please refer to the illustration below for the correct mounting orientation.
Yes, provided that the combined thickness of the workpiece and the mounting plate is within the T dimension specified in the catalog (tolerance: ±0.2 mm).
However, inserting a workpiece reduces the thickness of the mounting plate. Therefore, it is recommended to ensure sufficient plate thickness to allow for precision holes and chamfering.
Yes.
When mounted on a vertical surface, the moment load generated by the weight of the workpiece may cause a gap between the plates.
When used in a hanging position, a gap may occur if the weight of the workpiece exceeds the clamping force.
Please refer to the table below for details.
When using the product in a hanging position or on a vertical surface, be sure to implement adequate safety measures.
| Series | Size | Clamping Force (N) | Shear Strength at Failure (N) | Tensile Strength at Failure (N) | Max. Gap Between Plates (mm) |
|---|---|---|---|---|---|
| QCTH QCTHL QCTHH |
0525-10 | 60 | 1800 | 1200 | 1.5 |
| 0834-14 | 90 | 3200 | 2600 | 1.2 | |
| 0834-20 | |||||
| QCTHA | 0525-10 | 60 | 1800 | 1200 | 0.7 |
| 0834-14 | 90 | 3200 | 400 | 1.1 | |
| QCTHA-SUS | 0525-10 | 60 | 1800 | 1200 | 0.7 |
| 0834-14 | 90 | 3200 | 1.1 | ||
| QCTHS | 0825-20 | 250 | 4800 | 1100 | 1.0 |
| 0834-20 | 400 | 1600 | 1.5 | ||
| QCTHSA | 0825-20 | 250 | 3000 | 1600 | 1.2 |
| 0834-20 | 400 |
Yes.
By using the optional spacer, the product can be used with plates that are 3 mm thick or greater but less than 6 mm.
Yes, the product can be used with a single clamp and receptacle set.
However, we recommend using locating pins to prevent the plate from rotating.
