When you need an easy-to-use measurement system for accurately and precisely determining spring rates, spring constants, spring 

lengths and other spring characteristics, Starrett S2 systems are the solution.  S2 systems are ideal for high volume production testing, quality control including incoming inspection verification and validation, and research and design engineering.

S2 systems may be used for compression and extension springs with load ratings up to 11,000 lbf (50 kN, 5000 kgf).  Our simple, fill-in-the-blank test setups let you test and validate your springs in as few as three steps allowing your testing to be performed in seconds.  In addition, your test results can be viewed, graphed and reported, including the ability to export results or raw data at rates up to 1000Hz.

Create compression and extension tests using the test templates supplied as standard with your S2 system.  Or, use the optional Test Builder application to create sophisticated, multi-point test setups for more advanced spring measurement.  The optional S2 Automation Builder software works with the S2 Test Builder application so you can use conditional branching and digital I/O to interface with ancillary equipment such as annunciators, conveyors and turret loading devices.

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Test Set Up Options

Pre-Test Options
  • Units of Measurement
  • User Prompts to assist operator during testing
  • Spring preconditioning (Scrag and Load Set Hold for duration)

Test Options
  • Measure Free Length
  • One Point Limit Test (Load or Height)
  • Two Point Limit Test (Load and/or Height)
  • Exceptions (Abort test if an exception is met)

Data Options
  • Spring Constant (One Point)
  • Spring Rate (Two Point)
  • Date, User, Limit Setpoints

Post-Test Options
  • Export Raw Data to a file location (up to 1000 samples/second)
  • Export Results (Overwrite or Append data file)

Test Methods
  • Spring Constant
  • Spring Rate
  • Initial Tension
  • Free Length
  • Load @ Height/Lengths
  • Single Point
  • Two Point
  • Multiple Points
  • Height/Length @ Loads
  • Single Point
  • Two Point
  • Multiple Points
  • Scragging and Load Hold Set
SpecificationsSMS500SMS1000SMS2500SMS5000

Load Capacity
N
kgf
500
50
1000
100
2500
250
5000
500
Load Measurement AccuracyMLC Series+/-0.05% Full Scale
FLC Series+/-0.1% Full Scale
Units of Measure- Loadgf, ozf, kgf, lbf, N
Units of Measure - Length/Heightmm, inch
Maximum Test Speed per Minute1270 mm (50 inch)
Minimum Test Speed per Minute0.02 mm (0.001 inch)
Stroke381 mm (15 inch)762 mm (30 inch)1016 mm (40 inch)1016 mm (40 inch)
Test Platform203 mm (8 inch)
Length Resolution0.001 mm (0.0001 inch)
Deflection CompensationStandard, User-adjustable
Linear Error CorrectionStandard, User-adjustable
Operating SystemWindows®
Sensor Resolution10,000:1
Sensor ComplianceIEEE 1451.4, ASTM E4,
NIST-traceable
Data Sampling Rate (Hz)5 to 1000 Hz
CE ComplianceAll systems conform to relevant European
standards and carry the CE mark
Communications/NetworkingUSB & Bluetooth®
PowerUniversal, Automatic Sensing 100 V,
120 V, 220 V, 240 Vac
Operating Temperature+50° to +100°F (+10° to +38°C)
Storage Temperature-40° to +150°F (-40° to +66°C)
Relative Humidity10% to 90%, Non-condensing
Test Frame Height813 mm (32 inch)1270 mm (50 inch)1575 mm (62 inch)1575 mm (62 inch)
Test Frame Width381 mm (15 inch)381 mm (15 inch)381 mm (15 inch)381 mm (15 inch)
Test Frame Depth514 mm (20.25 inch)514 mm (20.25 inch)514 mm (20.25 inch)514 mm (20.25 inch)
Test Frame Weight61 kg (135 lbs)77 kg (170 lbs)88 kg (195 lbs)88 kg (195 lbs)
Test Functions & Features
Load at LengthOne Point, Two Point
Length at LoadOne Point, Two Point
Free LengthStandard, Compression
Initial TensionStandard, Extension
Quick Test TemplatedStandard, Compression & Extension
Multi-Point TestingUnlimited Points using Optional Test Builder application
Digital I/OUsing Optional Test Builder with
optional Automation Builder applications
Conditional BranchingUsing Optional Test Builder with
optional Automation Builder applications
Arithmetic/FormulasUsing Optional Test Builder with
optional Automation Builder applications