Donut/Through Hole Load Cell

Robust and accurate with high resistance to off-axis loads
Description
Product Highlights And Features
- Small Footprint: only 0.63” (16 mm) height and 1.98” (50.3 mm) outer diameter
- Lightweight: 8 oz (227 g)
- Flexible Inner Diameter: from 3/8” (9.7 mm) to 5/8” ( 16.1 mm)
- Dynamic response: exceptional low deflection and high natural frequency
- Energy efficient: 700 Ohm bridge resistance
- High Capacity Load Cell: 10000 lb [44480 N]
- Integrated 4-position micro receptacle: Enables easy installation and maintenance while delivering enhanced performance through a higher IP rating.
- IP67 Rating: withstand submersion in one meter of water for up to 30 minutes.
LTH400 is a low-profile donut or through-hole load cell for applications that require the load structure to pass through the sensor. It features multiple strain gauges that optimize the model’s performance and significantly reduces the influence of extraneous loads.
LTH400 is ideal for inline applications with limited vertical space that require a sensor that can handle eccentric loads and still maintain a high level of accuracy and reliability.
Small footprint
At 0.63in (16mm) height and 1.98in (50.3mm) diameter, these miniature sensors fit into applications that require a small footprint. The units are offered in a variety of inner diameter sizes from 3/8in to 5/8in (9.75 to 16.1mm), depending on the item. The lightweight models weigh 8oz (227g).

Powerful performance
The proprietary design, coupled with FUTEK’s sophisticated metal foil strain gauge technology, guarantees high accuracy and repeatability. The extra strain elements inside the sensor ensures high sensitivity and accurate measurements to off-axis loads, even in high extraneous load conditions. This allows you to mount the sensor in different rotational patterns, orienting the sensors to suit your system design, and still collect reliable, and accurate measurements.
Robust construction
The sensors are conformally coated inside with a silicone dielectric gel, which absorbs shock and vibration, ensuring that the interconnected wires do not fatigue or fail. The coating also provides environmental protection against any ingress, improving product life. Welded isolation diaphragms add another level of robustness and protection against outdoor or washdown environments. The overall design qualifies for IP67 rating.
Through-hole mounting
LTH400 model has a through hole with an inner hub that allows load to be attached. The outer diameter has a hub on the bottom base, where the unit is to be supported. The strain is measured in the diaphragm between the loading point (ID) and the mounting point (OD). Typically, a bolt or any other component connected to the load passes through the ID.

Plug in, plug out
The LTH400 is now offered with an integrated 4-pin micro connector, which allows for easy and simple cable connection and disconnection. A damaged sensor cable can be replaced without having to replace or disassemble the sensor or any other system component, which saves time, leads to higher system availability, and reduces the total cost of ownership. It also simplifies the installation process, reducing installation time and maximizing up time.
The 4-position micro cable connector is shown here with the keyed mating face to reduce mating errors. The image shows another model.
Overload protection
The LTH400 has 150% mechanical overload protection. This prevents sensor damage from direct inline overloads that could occur during the setup process or the occasional system over range.
Excellent thermal performance
The LTH400 provides reliable performance over a wide temperature range of –60 to 200°F (–50 to 93°C). The thermal performance allows you to use the sensor in various applications and environments.
Best-in-class materials
The exceptional quality of FUTEK’s LTH400 sensors makes it highly durable, robust, and reliable. Its body is made of aerospace-grade 17-4PH stainless steel, which provides high strength, high hardness, and corrosion resistance over a wide temperature range.

Recommended applications
FUTEK’s LTH series sensors are ideally suited for applications such as press, inline compression applications, bolt fastening, toggle force clamp measurement, overload monitoring, post or leg mount, rolling mill systems, nut runner force/torque monitoring, and dual tank level controllers. Being miniature, highly robust, and reliable, these sensors were featured in NASA’s Orion deployment mechanism.
Calibration included
The LTH400 has been tested by FUTEK’s world-class calibration department and is NIST traceable. We can also reduce hidden costs and setup time by calibrating your sensor with FUTEK electronics of your choice. In addition, we offer calibration to ANSI Z540-1 and ISO 17025 standards upon request.
Made in Irvine, CA
Designed and manufactured in-house. Our multidisciplinary engineering teams, high precision machining center, state-of-the-art quality assurance systems, and R&D and manufacturing facilities are all under one roof, allowing us to continuously reinvent and refine our products and processes.

Robust and accurate with high resistance to off-axis loads
Description
Product Highlights And Features
- Small Footprint: only 0.63” (16 mm) height and 1.98” (50.3 mm) outer diameter
- Lightweight: 8 oz (227 g)
- Flexible Inner Diameter: from 3/8” (9.7 mm) to 5/8” ( 16.1 mm)
- Dynamic response: exceptional low deflection and high natural frequency
- Energy efficient: 700 Ohm bridge resistance
- High Capacity Load Cell: 10000 lb [44480 N]
- Integrated 4-position micro receptacle: Enables easy installation and maintenance while delivering enhanced performance through a higher IP rating.
- IP67 Rating: withstand submersion in one meter of water for up to 30 minutes.
LTH400 is a low-profile donut or through-hole load cell for applications that require the load structure to pass through the sensor. It features multiple strain gauges that optimize the model’s performance and significantly reduces the influence of extraneous loads.
LTH400 is ideal for inline applications with limited vertical space that require a sensor that can handle eccentric loads and still maintain a high level of accuracy and reliability.
Small footprint
At 0.63in (16mm) height and 1.98in (50.3mm) diameter, these miniature sensors fit into applications that require a small footprint. The units are offered in a variety of inner diameter sizes from 3/8in to 5/8in (9.75 to 16.1mm), depending on the item. The lightweight models weigh 8oz (227g).

Powerful performance
The proprietary design, coupled with FUTEK’s sophisticated metal foil strain gauge technology, guarantees high accuracy and repeatability. The extra strain elements inside the sensor ensures high sensitivity and accurate measurements to off-axis loads, even in high extraneous load conditions. This allows you to mount the sensor in different rotational patterns, orienting the sensors to suit your system design, and still collect reliable, and accurate measurements.
Robust construction
The sensors are conformally coated inside with a silicone dielectric gel, which absorbs shock and vibration, ensuring that the interconnected wires do not fatigue or fail. The coating also provides environmental protection against any ingress, improving product life. Welded isolation diaphragms add another level of robustness and protection against outdoor or washdown environments. The overall design qualifies for IP67 rating.
Through-hole mounting
LTH400 model has a through hole with an inner hub that allows load to be attached. The outer diameter has a hub on the bottom base, where the unit is to be supported. The strain is measured in the diaphragm between the loading point (ID) and the mounting point (OD). Typically, a bolt or any other component connected to the load passes through the ID.

Plug in, plug out
The LTH400 is now offered with an integrated 4-pin micro connector, which allows for easy and simple cable connection and disconnection. A damaged sensor cable can be replaced without having to replace or disassemble the sensor or any other system component, which saves time, leads to higher system availability, and reduces the total cost of ownership. It also simplifies the installation process, reducing installation time and maximizing up time.
The 4-position micro cable connector is shown here with the keyed mating face to reduce mating errors. The image shows another model.
Overload protection
The LTH400 has 150% mechanical overload protection. This prevents sensor damage from direct inline overloads that could occur during the setup process or the occasional system over range.
Excellent thermal performance
The LTH400 provides reliable performance over a wide temperature range of –60 to 200°F (–50 to 93°C). The thermal performance allows you to use the sensor in various applications and environments.
Best-in-class materials
The exceptional quality of FUTEK’s LTH400 sensors makes it highly durable, robust, and reliable. Its body is made of aerospace-grade 17-4PH stainless steel, which provides high strength, high hardness, and corrosion resistance over a wide temperature range.

Recommended applications
FUTEK’s LTH series sensors are ideally suited for applications such as press, inline compression applications, bolt fastening, toggle force clamp measurement, overload monitoring, post or leg mount, rolling mill systems, nut runner force/torque monitoring, and dual tank level controllers. Being miniature, highly robust, and reliable, these sensors were featured in NASA’s Orion deployment mechanism.
Calibration included
The LTH400 has been tested by FUTEK’s world-class calibration department and is NIST traceable. We can also reduce hidden costs and setup time by calibrating your sensor with FUTEK electronics of your choice. In addition, we offer calibration to ANSI Z540-1 and ISO 17025 standards upon request.
Made in Irvine, CA
Designed and manufactured in-house. Our multidisciplinary engineering teams, high precision machining center, state-of-the-art quality assurance systems, and R&D and manufacturing facilities are all under one roof, allowing us to continuously reinvent and refine our products and processes.