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How to Choose a Universal Testing Machine: Capacity, Frame Type, Software and Accessories (Buyer's Guide)

Writer: Chris Thomas
Chris Thomas
Oct 14
6 min read

Buying a universal testing machine (UTM) is a 10- to 20-year decision, and the most expensive mistakes are buying the wrong capacity, the wrong frame or a machine that can't run your next standard. This buyer's guide walks through the six decisions that matter: peak force, frame type, test space, accuracy, software and accessories, plus when a lower-cost Mark-10 force tester does the job instead. For the basics of how a UTM works, start with What is a universal testing machine?.

Quick sizing guide: which machine fits your force range?

Step 1: Size the capacity to your peak force (with headroom)

Calculate the highest force your strongest specimen will reach (ultimate strength × cross-sectional area), then add 20 to 50 % headroom for stronger lots, new materials and future work. Three worked examples:

  • Plastics (ASTM D638 Type I): 13 × 3.2 mm at 100 MPa ≈ 4.2 kN, so a 10 kN machine is plenty.

  • Steel round bar (ASTM E8, 0.500 in diameter): 0.196 in² × 100 ksi ≈ 19.6 kip (87 kN), so choose a 100 kN to 200 kN frame.

  • Rebar (#8, Grade 60): 0.79 in² × 90 ksi ≈ 71 kip (316 kN), so you need a 600 kN floor-standing or hydraulic machine.

Don't oversize either. Load cells are verified over a range starting at a small fraction of capacity, so testing 50 N peel samples on a 100 kN load cell wastes resolution. Most labs solve this with one frame and two load cells: for example, a 10 kN frame with a 10 kN cell for plastics and a 500 N cell for films and peel.

Step 2: Choose the frame type

  • Single-column: compact and lower cost, best under about 2.5 to 5 kN. Less rigid at higher loads.

  • Dual-column benchtop: the workhorse from 5 kN to 100 kN. Stiffer frame, better alignment, room for wide grips and chambers. Our 100 kN benchtop model avoids the cost and floor space of a floor-standing frame.

  • Floor-standing electromechanical: 200 kN to 2,000 kN, precise speed and position control, quiet, low maintenance.

  • Servo-hydraulic: the most force per dollar for steel and rebar. Our BMT series uses DOLI control electronics and MOOG actuators, with tensile-only models from 100 kN to 4,000 kN and combined tension/compression models.

Step 3: Check the test space, travel and speed

Capacity gets all the attention, but test space is where most buying mistakes happen. Check three numbers on the cut sheet:

  • Crosshead travel: high-elongation materials need long travel. A rubber dumbbell that stretches 700 % needs far more stroke than a steel bar. The Quasar 10 kN is offered with 1,000, 1,500 or 1,750 mm of total stroke for this reason.

  • Width between columns: wide specimens, geotextiles, environmental chambers and large fixtures need space. The Quasar 10 kN comes in 350 mm or 510 mm widths.

  • Speed range: plastics and composites test at 1 to 5 mm/min, rubber and peel at 300 to 500 mm/min. The Quasar 10 kN covers 0.0005 to 500 mm/min (1,000 mm/min optional).

If you plan to test hot or cold, confirm the frame can carry an environmental chamber and still leave room for grips and an extensometer. See our temperature chamber buyer's guide.

Step 4: Accuracy, data rate and calibration

  • Force accuracy: the machine should be verified to ASTM E4 and ISO 7500-1. Ask for the verified range of each load cell, not just the headline accuracy.

  • Data rate: fast events (brittle breaks, peel peaks) need fast sampling. The Quasar samples internally at 1,000 Hz with 24-bit load resolution.

  • Strain: if you report modulus or yield, budget for an extensometer verified to ASTM E83 or ISO 9513. Compare options on our extensometers page.

  • Calibration: plan for annual verification. We offer calibration services for testing machines and extensometers.

Step 5: Software

Software decides how fast your operators work and whether your reports pass an audit. Our UTMs ship with Graphwork 6, which covers tensile, compression, 3- and 4-point flexure, peel, shear (Iosipescu, V-notch, short-beam), creep, relaxation and low-cycle fatigue, and calculates modulus, offset yield, Poisson's ratio, r-value and n-value. Look for:

  • Built-in methods for the standards you run (ASTM, ISO, DIN)

  • Custom test profiles and user permissions

  • Export to Excel, PDF and your LIMS

  • Remote support (our Galdabini machines support remote diagnostics)

Step 6: Budget for grips, fixtures and accessories

The frame is only part of the system. Price these at the same time so you aren't surprised:

When a Mark-10 frame or manual tester is enough

Not every lab needs a UTM. If your peak loads are under 1,500 lbf and you run peel, tear, seal, crimp, spring or simple compression tests, a Mark-10 frame costs much less and is faster to learn. We compare the two in detail in Mark-10 test frame vs. universal testing machine. For occasional low-force checks, a manual force tester is the lowest-cost option:

High-capacity testing: metals, rebar and structural steel

For ASTM A370, A615 rebar and other high-strength steel, look for hydraulic wedge grips, bend fixtures and a frame with enough stroke for long specimens. Here is one of our machines running steel above 2,000 kN:

What drives the price of a universal testing machine?

  • Capacity and frame type: the biggest factor. Price climbs steeply above 100 kN and again for hydraulic frames.

  • Test space: longer travel and wider columns cost more.

  • Load cells: each extra load cell adds cost but saves buying a second machine.

  • Software modules: advanced analysis, creep and fatigue modules add cost.

  • Accessories: grips, fixtures, extensometers and chambers can add up to a large share of the total.

  • Installation, training and calibration: ask what is included in the quote.

Our benchtop 2.5 kN machine is stocked in Massachusetts and can ship the same week with a load cell and basic fixtures. Request a quote for current pricing on any configuration.

Checklist before you request a quote

  • Every standard you run today and expect to run in the next five years

  • Strongest and weakest specimen: material, dimensions and expected peak force

  • Maximum elongation (sets travel) and widest specimen or fixture (sets column width)

  • Whether you need modulus or yield (extensometer) and whether you test at temperature (chamber)

  • Number of operators, throughput and reporting or audit requirements

  • Grips and fixtures you already own that should carry over

Universal testing machine FAQ

What capacity universal testing machine do I need? Calculate your highest peak force (strength × area) and add 20 to 50 % headroom. Most plastics, rubber and film labs need 5 to 10 kN; metals labs usually need 100 kN or more.

Single-column or dual-column? Single-column for low-force work up to about 2.5 to 5 kN; dual-column for anything higher or when you need a chamber or wide grips.

Electromechanical or hydraulic? Electromechanical for precise speed control and most materials; hydraulic for very high forces such as rebar and high-strength steel.

Can one machine test both plastics and metals? Yes, if you size the frame for the metals and add a second, smaller load cell for the plastics.

Can I keep my old grips? Usually. We make adapters for Instron, MTS, Zwick and other mounting styles.

Related reading

Talk to us

Send us your standards, specimens and expected loads and we will size the frame, load cells, grips and extensometer for you. Browse universal testing machines, download the Galdabini catalog or contact us for a quote.

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