Donut Through-Hole Load Cell LTH 300

Clear Through-Hole Design – Enables a sensor ring around a load path, allowing structures, bolts, shafts, or fixtures to pass through unimpeded.
Compact & Low Profile – Only ~0.28 in (7.1 mm) height with an outer diameter near 0.98 in (24.9 mm), enabling integration into space-constrained systems.
Flexible Inner Diameter Options – Inner diameters (I.D.) from 1/8″ (3.2 mm) to 3/8″ (9.5 mm) available to match your bolt or shaft dimensions.
High Accuracy & Responsiveness – Rated output ~2 mV/V, nonlinearity ±0.5 % of RO, nonrepeatability ±0.5 % RO, and minimal deflection (~0.001 in).
Robust Mechanical & Electrical Design – 17-4 PH stainless steel construction, 700 Ω bridge, robust strain relief, IP64 rating.
Overload Protection & Durability – Safe overload rated at 150 % of RO, protecting against transient loads.
Wide Operating Temperature Range – −60 °F to +200 °F (−50 °C to +93 °C); compensated from 60 to 160 °F.
Low Power & Low Deflection – Minimal deflection and energy usage make it suitable for dynamic and responsive measurement systems.

Parameter	Detail
Capacities	50 lb, 100 lb, 250 lb, 500 lb, 1,000 lb (various options)
Rated Output (RO)	2 mV/V nominal
Nonlinearity	±0.5 % of RO
Hysteresis	±0.5 % of RO (or per specs)
Nonrepeatability	±0.5 % of RO
Safe Overload	150 % of RO
Bridge Resistance	700 ohm nominal
Insulation Resistance	≥ 500 MΩ @ 50 VDC
Material	17-4 PH stainless steel
Deflection	~0.001 in (0.025 mm) nominal
Operating Temperature	–60 °F to +200 °F (–50 °C to +93 °C)
Compensated Temperature	60 – 160 °F (15 – 72 °C)
Cable / Wiring	29 AWG, 4-conductor, spiral shielded Teflon cable (~10 ft)
Weight	~2 oz (57 g)
IP Rating	IP64 (for standard versions)

The Donut Through-Hole Load Cell (LTH300) is ideal for:

Measuring bolt preload / clamping forces in assemblies
Inline compression sensing for press, stamping, or load washer systems
Load monitoring in machinery where a bolt or shaft must pass through the sensor
Structural or fixture designs where traditional load cells cannot be placed around the load path
Inline force sensing in manufacturing or test systems where space is tight

True through-hole design allows the load path to pass unhindered, simplifying mechanical integration.
Reliable accuracy even under dynamic loading and temperature variation.
Overload protection and durability guard the sensor against installation torque or transient loads.
Compact footprint designed for tight assemblies with minimal added height.
Support & calibration – Metromatics can assist with matching ID sizes, calibration, integration, and mounting guidance.

If you would like to learn more about this product or would like to place an order, please contact us.

When ordering an LTH300, consider:

Inner diameter (I.D.) selection – choose the correct bore size to match your bolt, shaft, or structure (1/8″, 1/4″, 5/16″, 3/8″).
Capacity selection – select a sensor that comfortably exceeds your maximum expected load to maintain linearity and protect against overload.
Cable length / connector options – standard 10 ft Teflon cable; if you need shorter or custom wiring, request modifications.
Calibration & matching – request compressive calibration, traceable certification, or matched output if needed for system consistency.
Environmental conditions – verify that operating temperature range, IP rating, and mechanical deflection suit your application.

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