Donut Through-Hole Load Cell LTH 400

Key Features & Benefits of the Donut Through-Hole Load Cell LTH 400

• True Through-Hole (“Donut”) Design – enables your mechanical component (bolt, rod, shaft) to run through the sensor while the load is measured around it.

• Low Profile & Compact Diameter – Typical height of 0.630 in (≈16.0 mm) and outer diameter ~1.980 in (≈50.3 mm), making it suitable for installations with limited vertical space.

• Multiple Inner Diameter Options – Various I.D. sizes (e.g. 3/8″, ½”, 5/8″) to match your bolt or shaft dimensions.

• High Accuracy & Robust Output

  • Nonlinearity ±0.25% of RO

  • Hysteresis ±0.50% of RO

  • Nonrepeatability ±0.05% of RO

• Strong Electrical Performance

  • Rated Output: ~2 mV/V nominal

  • Bridge Resistance: 700 Ω nominal

  • Insulation Resistance ≥ 500 MΩ @ 50 VDC

• Durable & Rugged Construction – Made of 17-4 PH stainless steel, with conformally coated internals for shock, vibration, and environmental protection.

• Sealed & Connectorized – IP67 rating for short submersion or harsh environments; uses a 4-position micro circular connector (CC19) for quick connect/disconnect.

• Low Deflection & High Natural Frequency – Deflection ~0.002 in (0.05 mm) under rated load helps maintain stiffness and dynamic response.

• Temperature Performance

  • Operating: –60 to +200 °F (≈ –50 to +93 °C)

  • Compensated: 60 to 160 °F (≈ 15 to 72 °C)

  • Temperature shifts small for zero/span per °F/°C

Technical Specifications of the Donut Through-Hole Load Cell LTH 400

Typical Applications of the Donut Through-Hole Load Cell LTH 400

The Donut Through-Hole Load Cell (LTH400) is ideal for:

• Measuring bolt preload / clamping forces in assemblies or bolted joints

• Inline compression sensing in presses, clamps, or fixtures

• Structural force measurement where a rod or shaft must pass through the sensor

• Industrial automation or machinery with tight space constraints

• Load monitoring in test rigs, manufacturing lines, and quality control environments

Why Choose the Donut Through-Hole Load Cell LTH 400

• True through-hole design simplifies mechanical integration without detours around bolts or shafts

• High accuracy & rugged build ensures dependable readings even under vibration and load disturbances

• Connectorized & sealed – quick disconnects and IP67 rating support maintenance and harsh environments

• Low deflection and high natural frequency help with dynamic performance and stiffness in your system

• Support & calibration – Metromatics can help calibrate, size inner diameter, choose capacity, and advise integration

Donut Through-Hole Load Cell LTH 400 Versions

Ordering & Configuration Notes

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

When selecting an LTH400, consider:

1. Inner Diameter (I.D.) – Choose the bore size (3/8″, ½”, 5/8″, etc.) to suit your bolt or shaft.

2. Capacity – Pick a load rating that exceeds your maximum expected load by margin.

3. Cable vs Connector – Connector version (micro circular) enables easier disconnection; cable version may also be available.

4. Calibration – Request standard 5-point compression calibration or optional custom calibration.

5. Mounting & alignment – Ensure the sensor is flush-mounted, aligned coaxially, and avoid side/bending loads.