Miniature Load Cells
Miniature load cells are compact strain-gauge force sensors designed for applications where space, weight, or integration geometry prevent the use of standard-size transducers. Transcell manufactures miniature load cells in three form factors — button (TC-LB), threaded inline (TCM series), and mini S-beam (BMF200) — covering 0.25 lb to 10,000 lbf in stainless steel and aluminum construction.
Compact load cell designs including button, inline, and mini S-beam configurations for precision measurement in tight spaces.
TL;DR — Miniature Load Cells at a Glance
- Three miniature form factors: button (TC-LB), threaded inline (TCM325/350/375), mini S-beam (BMF200)
- Capacity range from 0.25 lb (BMF200) to 10,000 lbf (TC-LB/TCM375)
- Stainless steel (TC-LB, TCM) and aluminum (BMF200 low-range) construction
- Tension, compression, or bidirectional measurement depending on series
- mV/V output with full Wheatstone bridge, compatible with PLCs and motion controllers
- Cross-reference replacements for Futek LLB400/LLB450 and LCM325/350/375 series
- Ships from Buffalo Grove, IL; NIST-traceable calibration included
At-a-Glance Technical Summary
0.25 lb to 10,000 lbf (series dependent)
±0.10% (BMF200) to ±0.25% F.S. (TCM/TC-LB)
0.5–2.0 mV/V (series dependent)
150–1,000% (model dependent)
Stainless steel / Aluminum (BMF200 ≤10 lb)
Robotics, medical devices, automation, lab testing
mV/V (passive Wheatstone bridge, 10V DC excitation)
Futek LLB400/LLB450, LCM325/350/375
Miniature Load Cell Series Comparison
| Series | Form Factor | Capacity Range | Nonlinearity | Direction | Material |
|---|---|---|---|---|---|
| TC-LB | Button (compression) | 100–10,000 lbf | ±0.15–0.25% F.S. | Compression only | Stainless steel |
| TCM325 | Threaded inline (3/8-24) | 2,000–3,000 lbf | ±0.25% F.S. | Tension + compression | Stainless steel |
| TCM350 | Threaded inline (1/2-20) | 4,000–5,000 lbf | ±0.25% F.S. | Tension + compression | Stainless steel |
| TCM375 | Threaded inline (3/4-16) | 7,500–10,000 lbf | ±0.25% F.S. | Tension + compression | Stainless steel |
| BMF200 | Mini S-beam | 0.25–100 lb | ±0.10–0.30% R.O. | Tension + compression | Aluminum (≤10 lb) / SS (25–100 lb) |
How Miniature Load Cells Work
Miniature load cells use the same strain-gauge Wheatstone bridge technology as full-size sensors, scaled down to fit inside mechanisms, robotic grippers, medical devices, and test fixtures where every millimeter counts. Bonded foil gauges detect micro-deformation in a precision-machined sensing element and produce a differential voltage proportional to applied force.
The key engineering challenge at small scale is signal output. Sub-pound sensors like the BMF200 at 0.25 lb capacity produce only 0.5 mV/V at full scale — a 5 mV signal on 10V excitation. That demands clean wiring, shielded cable, and a quality signal conditioner or high-resolution DAQ system. At higher capacities (1,000+ lbf), the TCM and TC-LB series produce 2.0 mV/V with standard signal conditioning.
Who These Load Cells Are For
Selecting the Right Miniature Load Cell
Start with the measurement direction. Compression-only? The TC-LB button is the simplest option. Bidirectional tension and compression? Choose between TCM threaded inline (for load-chain applications) and BMF200 mini S-beam (for ultra-low ranges below 100 lb).
Within each series, size for 1.5× to 2× your peak expected force. A robotic gripper that applies 1,500 lbf max grip force should use the TCM325-2KLBF — not the TCM325-3KLBF. Operating at 50–75% of rated capacity gives the best signal-to-noise ratio and longest fatigue life.
For sub-pound measurements (< 1 lb), the BMF200 is the only option in Transcell’s lineup. At 0.25 lb capacity with 0.5 mV/V output, you need a signal conditioner with at least 24-bit resolution. Below 5% of rated capacity, noise dominates the signal — if your application requires 0.01 lb resolution, spec the 0.25 lb or 0.5 lb model, not the 2 lb.
Installation and Integration
Each miniature form factor has distinct mounting requirements.
TC-LB Button
Mount via 4-hole bolt circle flange. The integrated dome must face the load. Misalignment beyond 5° introduces cosine errors that exceed the ±0.25% spec.
TCM Threaded Inline
Thread directly into the load chain using integrated male threads (3/8-24, 1/2-20, or 3/4-16). Measures both tension and compression through the threaded connection. Avoid cross-threading — start by hand before using a wrench.
BMF200 Mini S-Beam
Mount via through-holes at top and bottom using appropriate hardware. The S-beam geometry handles both tension and compression. For sub-pound ranges, vibration isolation is critical — any mechanical resonance in the fixture appears as force noise.
All three series output a passive mV/V signal. Connect to a Transcell digital indicator, the analog input of a PLC or motion controller, or use a signal conditioner to generate a high-level output (0–10V or 4–20mA) for longer cable runs.
Standards and Calibration
Every Transcell miniature load cell ships with an individual NIST-traceable calibration certificate. Transcell manufactures under an ISO 9001 quality system — each unit undergoes in-house calibration and inspection before shipment.
For applications requiring periodic recalibration, Transcell’s calibration laboratory handles all miniature cell series in-house. The BMF200’s aluminum construction is more susceptible to creep than stainless steel models — annual recalibration is recommended for precision applications below 10 lb. See the certifications page for quality system details.
How Transcell Compares
Transcell’s TCM series directly replaces Futek LCM325, LCM350, and LCM375 threaded inline cells. The TC-LB replaces Futek LLB400 and LLB450 button cells. Same electrical specifications, same thread sizes, same mV/V output — swap without rewiring or fixture modification.
Download datasheets for all miniature load cell series — specs, drawings, wiring diagrams
Miniature Load Cell FAQs
Request a Quote for Your Miniature Load Cell Application
Provide your force range, measurement direction, and mounting constraints. Our engineering team will recommend the appropriate series and capacity.
Need Help Selecting a Miniature Load Cell?
Provide your force range, measurement direction (tension, compression, or both), mounting constraints, and signal conditioning setup. Our engineering team will recommend the appropriate series and capacity, verify Futek cross-reference compatibility, and confirm lead time.
Typical response time: within 24 business hours.