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TST 200 - Torsion Spring Tester
TST 200 - Torsion Spring TesterPart Testing Capacity

The TST is a manually operated torque / angle tester that is available in five force ranges: 0.3, 3, 25, 100 and 200 in-lb. The solid steel base and aluminum frame is rugged for durability in many different testing environments. The TST, like all LSI testers, comes standard with an NIST traceable certificate of calibration.

Absolute Zero
Take the guesswork out of testing with LSI’s revolutionary absolute zeroing technique. Used with custom interchangeable tooling, this technique improves repeatability of setups and results during testing. Parts are then measured against the nominal dimensions according to the drawing or specifications, not to a relative point requiring intuition and guesswork.

Custom Interchangeable Tooling
Using LSI's custom interchangeable tooling technique, you can machine tooling blanks to fit your specific applications or send the information to us and we will do the work for you.

Custom Tooling Example
Custom Tooling Example
  • Achieve 30 second tool-less changeovers from type to type
  • Identical setups each time enhance repeatability
  • Pre-machined blanks make tooling inexpensive and standardized
  • Tooling can be designed to exactly match assembly features for best correlation
  • Built-in angle zeroing provides ± 0.1° setup accuracy every time
  • The best solution for repeating parts or specific spring types or families
Important Notice

Custom tooling can be a critical component for accurately testing your part. Click here for more details.

Universal Tooling Example
Universal Tooling Example

Universal Tooling
With the universal tooling supplied by LSI, you can test many parts with no special fittings. This is great for unique or one-time job runs with a minimum of setup time.

  • 2", 3" & 4" universal fittings
  • A conventional approach that has good flexibility in making setups
  • Includes chuck, mandrill set to 17/32" diameter and reaction plate

Rapid Changeovers
Both custom and universal tooling is designed to be changed in seconds... YES! In just seconds, you can go from one setup to the next, maintaining your repeatability and reproducibility. Setups within ± 0.1°.

Torque Cartridge
Torque Cartridge

Smart Interchangeable Torque Cartridges
Switch from one torque cartridge to another in just minutes, allowing for a single tester to test a wide range of capacities quickly and accurately. Smart torque cartridges can be digitally calibrated. You can also send in only the smart torque cartridge to LSI for remote calibration (full system calibration is better than individual component calibration).

Delicate lower-capacity torque cartridges feature overload-preventing lockout mechanisms.

Limit Lights & Full Statistical Analysis
Offered as an option, these features specify a range or tolerance in either load or deflection angle. Then, with the convenient light indicators, you can determine if the item tested is low, good or high. Print out a full statistical analysis clearly showing the results.

Digital Control Panel
The TST has a built-in mean, standard deviation, range, statistical summary and data logger that can store up to 1,800 test points. It also has automatic deflection compensation, which corrects for torque windup and always displays accurate angle measurements. RS 232 is standard. Soft keys give the user access to digital calibration, linearization and features like user programmable force filter, programmable length offset, user customized print headings, automatic calculation of mean, standard deviation and range of data. Use the RS 232 port for statistical printout or talking to a PC. It works great with LSI's SSS, a PC-based “Statistical & Spreadsheet Interface Software,” which features dynamic data exchange, allowing you to communicate to spreadsheets like Excel. Measure torque in in-lb, N-mm, gm-mm, kg-m, in-oz, ft-lb, N-m, kg-mm and kg-cm.

X-Axis Compression Adjuster
The X-Axis
Compression Adjuster

Torsion Tests Under Compression - LSI Video Demonstration Video
Create a more life-like test with optional adjustable compression. The X-Axis Compression Adjuster allows you to apply up to 250 lb of compression force, (based on prior force / length measurements) and gain more accurate readings for your part tests.

Use the optional X-Axis Linear Scale to set compression by length.

2 Point with Rate
Two-point testing with automatic spring rate calculation. Test it, then print out with a statistical summary.

Calculated Free Angle
Two-point testing with automatic free angle calculation. Calculate your torsion springs free angle without measuring by testing two points in one deflection of the spring.

Three Rotational Stops
For repetitive applications requiring multiple test points on a given spring, the Torsion Spring Tester comes equipped with three stops that can be preset to any given test point.

Battery or AC Powered
A self-contained tester with an internal, rechargeable battery pack (approximately 8-10 hours of continuous operation). AC charger also included with each tester.

Loading Capability
The TST comes standard with two cranking ratios, giving the operator flexibility when testing. Use the 1:1 ratio for light springs or course movements. Choose the 40:1 micro adjust to fine tune the measurements.

Standard Features

  • Manual operation
  • Up to 48" part length capability (11.5" standard)
  • Standard 8" part Ø capability
  • Standard 0.1° angle resolution
  • 0.3 to 200 in-lb load capacities
  • SDHT software package
  • Smart interchangeable torque cartridges
  • Interchangeable tooling
  • Custom tooling or universal tooling options
  • Deflection compensation
  • Absolute zeroing
  • Digital calibration
  • Battery or AC powered
  • NIST traceable calibration
Torque Specifications
Load Cell
Standard Resolution
0-20% FS 20-100% FS
0.3 in-lb 0.00002 in-lb 0.0002 in-lb
3 g-mm 0.2 g-mm 2 g-mm
34 N-mm 0.002 N-mm 0.02 N-mm
3 in-lb 0.0002 in-lb 0.002 in-lb
35 g-mm 2 g-mm 20 g-mm
339 N-mm 0.02 N-mm 0.2 N-mm
25 in-lb 0.002 in-lb 0.02 in-lb
288 kg-mm 0.02 kg-mm 0.2 kg-mm
2,825 N-mm 0.2 N-mm 2 N-mm
100 in-lb 0.005 in-lb 0.05 in-lb
1,152 kg-mm 0.05 kg-mm 0.5 kg-mm
11,299 N-mm 0.5 N-mm 5 N-mm
200 in-lb 0.01 in-lb 0.1 in-lb
2,304 kg-mm 0.1 kg-mm 1 kg-mm
22,597 N-mm 1 N-mm 10 N-mm
Accuracy = ± Full Scale Resolution x 2
Angle Specifications
Range Resolution
0 - 100,000° 100,000°+
1,000,000° 0.1°
Accuracy = ± 0.2° / 3,600°
Deflection compensation
(5% to 95% FS) is < 0.2°
Ordering Information
Part Number Description Price
050-0000-0071-00 TST 200 - Torsion Spring Tester Quote
Factory Options
025-0000-0669-00 Bed Extension for 24" parts Quote
025-0000-0669-01 Bed Extension for 48" parts Quote
025-0000-0725-00 X-Axis Compression Adjuster Quote
025-0000-0730-00 X-Axis Linear Scale Quote
SDHT Tester Software
050-0000-0072-00 2 Point With Rate (Torsion) Quote
050-0000-0073-00 Limit Lights & Full Statistical Analysis Quote
050-1000-0040-01 Calculated Free Angle Quote
050-0000-0082-00 Peak Test Mode Quote
050-0000-0074-00 Interchangeable Torque Cartridge Capability Quote
Torque Cartridges
025-0000-0475-00 0.3 in-lb Torque Cartridge with Lockout Quote
025-0000-0475-01 3 in-lb Torque Catridge with Lockout Quote
025-0000-0475-02 25 in-lb Torque Cartridge with Lockout Quote
025-0000-0378-05 100 in-lb Torque Cartridge Quote
025-0000-0378-06 200 in-lb Torque Cartridge Quote
Tooling Options
018-0000-1615-01 2" Ø Custom Tooling Blanks (1/4-28 thread) Quote
018-0000-1615-02 2" Ø Custom Tooling Blanks (10-32 thread) Quote
018-0000-1615-00 3.75" Ø Custom Tooling Blanks (1/4-28 thread) Quote
018-0000-1615-03 5" Ø Custom Tooling Blanks (1/4-28 thread) Quote
025-0000-0379-00 Universal Tooling Assembly (0.3 to 200 in-lb) Quote
025-0000-0353-00 Universal Tooling Assembly (25 to 1,300 in-lb) Quote
Material Testing Options
025-0000-0477-00 Wire Twist Grip Set - 0.028 to 0.250" Quote
025-0000-0477-01 Wire Twist Grip Set - 0.078 to 0.500" Quote
025-0000-0480-00 Wire Twist Solid Load Cartridge Quote
Calibration Equipment
025-0000-0367-00 Calibration Core Set (0.3 to 3 in-lb) Quote
025-0000-0354-00 Calibration Core Set (25 to 200 in-lb) Quote
025-0000-0368-01 1.01 lb Calibration Weight Set (0.3 to 3 in-lb) Quote
025-0000-0368-02 11 lb Calibration Weight Set (25 in-lb) Quote
025-0000-0368-03 40.5 lb Calibration Weight Set (100 to 500 in-lb) Quote
Printer & Connectivity Options
025-1000-0261-00 Internal RS 232 Capability Quote
025-0000-0464-00 Inkjet Printer (Includes Adapter Cable) Quote
025-0000-0458-00 RS 232 to Parallel Adapter Cable Quote
050-0000-0075-00 SSS - PC Statistical & Spreadsheet Interface Software Quote
Power Supplies (One power supply is included with each new order)
025-1000-0396-00 Power Supply - USA (115 VAC) Quote
025-1000-0396-04 Power Supply - International (100-240 VAC 50-60 Hz) Quote
025-0000-0356-00 Foam Vibration Damping Pad Quote
059-1000-0020-00 Dust Cover Quote

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Larson Systems Inc.
13847 Aberdeen Street NE
Ham Lake, MN 55304
Phone: 763-780-2131
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