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Calibration and Certification Services for Tensile Testing Equipment

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Calibration and Certification Services for Tensile Testing Equipment

Are you looking for calibration and certification services for your tensile testing equipment? Many labs and manufacturers face the same challenge. Without proper calibration, test results lose accuracy and may not pass industry audits. This creates risk, wasted time, and added costs.

Calibration is more than a technical requirement. It is the foundation of trustworthy results and international recognition. When your equipment is calibrated and certified, you can rely on every data point. You can also prove compliance when customers, auditors, or regulators review your processes.

At TensileMill CNC, we understand these needs. That is why we provide a complete service package that goes beyond basic calibration. With our ISO 17025-accredited partners, you receive certified documentation, ongoing support, and confidence that your testing systems meet ASTM, ISO, and NADCAP standards.

Our Calibration and Certification Services

We offer calibration and certification for both our own machines and third-party equipment, including brands like Instron and Tinius Olsen. No matter where your system comes from, we help you bring it to recognized international standards.

Every service is carried out through ISO 17025-accredited partners. This means you receive documentation that auditors and industry regulators accept without question. Your lab gains not just accurate results but also internationally trusted certification.

Our support goes further than calibration alone. We include preventative maintenance to keep your equipment performing at its best. We also provide operator training, giving your team the knowledge to run tests correctly and confidently.

TensileMill CNC offers full calibration and certification services for UTMs, force measurement devices, extensometers, and alignment systems. Whether you use our equipment or third-party machines, we provide internationally accepted certificates and long-term reliability.
Universal testing machine fixtures prepared for NADCAP calibration process

Equipment We Calibrate

Our calibration and certification services include a wide selection of material testing equipment. You can review the main categories we handle in the list below:

  • Universal Testing Machines (UTMs) – calibration for tensile and compression systems to meet ASTM and ISO standards.
  • Load Cells and Force Measurement Systems – verification of accuracy under ASTM E4 and ISO 7500-1.
  • Extensometers – calibration according to ASTM E83 and ISO 9513 for precise strain measurements.
  • Frame Alignment and Displacement Systems – alignment verification and displacement checks under ASTM E1012, ASTM E2309, and ASTM E2658.
  • Specimen Preparation Tools – calibration and certification for specialized equipment to support compliant testing procedures.

Standards and Regulatory Requirements We Follow

din-istm-iso-nadcap-certification

Calibration and certification are meaningful only when they comply with recognized international standards. We work with the following, making sure each piece of equipment is verified against the rules that matter most for testing accuracy and audit acceptance:

  • ASTM E4 – defines how to verify force-measuring systems in testing machines. It sets performance classes, such as Class A, which confirm that load readings are accurate within strict limits.
  • ISO 7500-1 – similar in scope to ASTM E4 but applied globally. It specifies classes 0.5 and 1 for force verification.
  • ASTM E83 – describes the calibration of extensometers. It defines classification levels, such as Class B1, which indicate the allowable error range for strain measurements
  • ISO 9513 – the international counterpart to ASTM E83. It establishes accuracy requirements for extensometers used in tension and compression testing.
  • ASTM E1012 – focuses on alignment verification of test frames. Misalignment can distort results, and this standard provides methods to measure and control frame coaxiality.
  • ASTM E2309 – sets procedures for calibrating digital indicators and displacement transducers. It ensures devices used to measure travel or movement in a test frame remain within required tolerances.
  • ASTM E2658 – provides verification methods for cable extension transducers using stopwatch-based timing. It links displacement measurements directly to traceable timing instruments.
    • Nadcap
  • ISO/IEC 17025:2017 – governs accreditation of calibration laboratories. A lab accredited under this standard demonstrates technical competence, validated methods, and reliable measurement uncertainty reporting.
  • ANSI/NCSL Z540-1-1994 – an American standard supporting traceability of measurements to national or international references. It confirms calibration records meet U.S. compliance expectations.
  • NADCAP – the aerospace and defense accreditation program. It replaces multiple customer audits with one standardized process and confirms that suppliers meet the highest levels of precision and reliability.
TensileMill CNC complies with all major calibration standards for tensile testing equipment and tools. We cover ASTM E4, ISO 7500-1, ASTM E83, ISO 9513, ASTM E1012, ASTM E2309, ASTM E2658, ISO/IEC 17025:2017, ANSI/NCSL Z540-1-1994, NADCAP, and many others. Whatever standard your lab requires for calibration or certification, our services are designed to meet it.

How Our Calibration Process Works

Calibration is only valuable when it is done in the right order. That is why we follow a simple step-by-step process. Each stage builds on the previous one, so your equipment leaves the calibration fully accurate, consistent, and ready for any audit.

Step 1. Equipment Preparation and Initial Check

We begin with a basic inspection of the machine. This confirms that all components are in proper condition for calibration.

Step 2. Calibration Across Load Points

The system is tested at multiple points in its operating range, typically from 20% to 100% of capacity. This verifies performance under real testing conditions.

Step 3. Verification of Linearity, Repeatability, and Accuracy

We confirm that results remain consistent, scale correctly across the range, and meet ASTM and ISO tolerance limits.

Step 4. Documentation and Certification

You receive an official certificate from an ISO 17025-accredited partner. The documentation is traceable and accepted in audits worldwide.

Step 5. Preventive Maintenance and Operator Training

We complete the service with maintenance checks and operator training. This helps extend equipment life and keeps results dependable between calibrations.

Why Clients Choose TensileMill CNC

Why Clients Choose TensileMill CNC

When companies look for calibration services, they want more than a simple checkmark on a certificate. They need a partner who understands the testing process, delivers accurate results, and makes compliance easier. That is where TensileMill CNC stands out.

We combine clear communication with hands-on technical expertise. From the first conversation, you know what will be done, why it matters, and how it supports your testing program. Our team works only with ISO 17025-accredited partners, so every certificate you receive carries international recognition and acceptance.

Unlike providers that handle only their own machines, we calibrate both TensileMill CNC systems and third-party equipment, including leading brands like Instron and Tinius Olsen. This flexibility allows laboratories to centralize all their calibration needs with one trusted source.

Our service also goes beyond calibration itself. We integrate preventive maintenance and operator training into the process, helping your equipment run longer and your staff work with confidence. This saves time, reduces downtime, and keeps your lab audit-ready throughout the year.

TensileMill CNC provides calibration and certification for both our own machines and third-party systems, including brands like Instron and Tinius Olsen. We work exclusively with ISO 17025 accredited partners, delivering internationally recognized certificates. Our service includes preventive maintenance and operator training, helping labs stay accurate, compliant, and audit-ready year-round.
Alignment Certificate

Certificate Sample
Certification Ready Device

Certification That Speaks the Language of Auditors

Calibration gives meaning to your testing results. Without it, even advanced equipment produces numbers that cannot be trusted, and audits quickly expose the gaps. With proper calibration in place, every measurement holds its value, and your lab can move forward with confidence.

At TensileMill CNC, we provide a complete service designed for both in-house and third-party equipment. Our process includes a detailed inspection of your machines, calibration performed under ASTM and ISO standards, and certified documentation issued through ISO 17025 accredited partners. The certificates you receive are traceable and accepted in audits across industries worldwide.

We also extend support beyond calibration itself. Preventive maintenance keeps systems stable between services, and operator training helps your team maintain consistency in daily work. Together, these steps give you more than a one-time certificate. They create ongoing reliability for your lab.

If your facility is ready to schedule calibration or request certification, you can get a quote online, and our team will be available to support you. TensileMill CNC is here to keep your equipment accurate, compliant, and ready for every test.

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How Should Heat-Treated Metals Be Prepared and Tested on a UTM?

For heat-treated metals, machine specimens after the final heat cycle, leaving 0.010 to 0.020 in (0.25 to 0.50 mm) for finish grinding to remove decarb. Use flood coolant, sharp carbide or CBN tools, and light radial cuts under 0.030 in (0.76 mm). Hold straightness within 0.002 in per 10 in (0.05 mm per 250 mm) and surface finish at or below Ra 32 µin (0.8 µm). Align shoulders carefully to avoid stress risers, then polish the gauge length longitudinally. On the UTM, select grips that match hardness and geometry, such as hydraulic wedge or collet grips for above 150 ksi (above 1,035 MPa) steels. Set a gauge length of 2 in (50 mm) or 4 in (100 mm) per ASTM E8 or ISO 6892-1, and place the extensometer on that length. Control strain rate per the method in the standard, for example 0.005 to 0.050 in/in/min (0.005 to 0.050 mm/mm/min). Record furnace profile, quench media, tempering temperature, and lot traceability in the report. Size the load cell so expected maximum load lands near 30 to 80 percent of capacity. Example, a 0.500 in (12.70 mm) round at 200 ksi (1,379 MPa) reaches about 39,000 lbf (173 kN), so a 50,000 lbf (222 kN) cell is a sound choice. Check alignment to limit bending strain per ASTM E1012. If you want to review UTM options for heat-treated specimens, you can explore details on the All Tensile Testing Equipment equipment page.

How Should I Select a UTM for Testing Heat-Treated Metals?

Start by sizing the frame for expected peak loads. Quenched and tempered fasteners commonly fall in the 100–220 kip (445–978 kN) range; heavy plate or bar can reach 300–450 kip (1,334–2,002 kN). Above about 220 kip (1,000 kN), hydraulic drives handle high-energy events and thick sections well. At lower forces, electromechanical machines provide tight speed control for low strain-rate work. Force accuracy should be verified to ASTM E4 or ISO 7500-1. Run alignment checks per ASTM E1012, then set grip faces and jaw pressure to avoid slippage on high-hardness surfaces. For quenched steels, many labs use hydraulic wedge grips with 2–3 in (50–75 mm) wide faces and tungsten-carbide serrations. Match face geometry to specimen thickness and edge finish. For strain measurement, pair a 2.0 in (50 mm) axial extensometer or a non-contact system when knife edges mark too easily. Typical crosshead speed capability should span roughly 0.002–20 in/min (0.05–500 mm/min) so you can cover ASTM E8 or ISO 6892 procedures. Check stroke, daylight, and column stiffness against your longest specimens, for example 12–24 in (305–610 mm) overall length, including grip engagement length. If you would like to compare frame sizes and controller options, you can review details on the All Tensile Testing Equipment equipment page.

How Does Heat Treatment Affect Tensile Testing Setup And Data Quality?

Heat treatment changes microstructure, which shifts yield, ultimate strength, and elongation. During tensile testing, use strain rate control per ASTM E8 or ISO 6892-1. For a 2 in (50 mm) gauge length, a typical rate of 0.005 in/in/min (0.005 mm/mm/min) gives a crosshead speed near 0.01 in/min (0.25 mm/min) until yield. Quenched and tempered steels often benefit from a lower pre-yield rate to capture modulus cleanly, then a higher rate to fracture as allowed by the standard. Hardened samples need grip faces that match geometry, such as fine-serrated flats for plate, or V-jaws or collets for rounds. Set wedge pressure only high enough to prevent slip. Verify axial alignment before testing, since small bending elevates local stress. A clip-on or non-contact extensometer with knife edges rated for high hardness protects the gauge section and maintains strain accuracy. Select frame capacity from expected peak load. Heat-treated bolts and bars can exceed 220 kip (1000 kN), which favors servo-hydraulic machines. Keep the load train calibrated to ASTM E4 and ISO 7500-1, and check extensometer class per ASTM E83 or ISO 9513. Correct setup and verified equipment help avoid overestimating strength on high-hardness materials. If you would like to review frame options and capacities, you can explore details on the All Tensile Testing Equipment equipment page.

Which Heat Treatment Variables Must Be Controlled Before Tensile Testing?

Control and document the heat profile. Record setpoint temperature, ramp rate, and soak time, using a practical rule such as 30 minutes per 1 in (25 mm) of section thickness. Space parts so air or protective atmosphere can circulate, keeping at least 0.5 in (13 mm) clearance. Attach a thermocouple to a dummy coupon of similar mass to verify that the batch actually reaches the target temperature and dwell. Cooling drives microstructure. Specify quench medium and its starting temperature, limit transfer time from furnace to quench to under 10 s (0.17 min), and maintain agitation so the bath temperature rise stays within about 25 F (14 C) during a batch. For quenched and tempered steels, record tempering temperature and duration. Plan post-heat-treatment machining for test coupons. Leave stock to remove scale or decarburization, typically 0.010 to 0.020 in (0.25 to 0.50 mm) per side, then finish the gauge section using coolant to keep surface temperature below roughly 300 F (150 C) to avoid tempering effects. Report the material condition and heat treatment in the tensile report per ASTM E8 and ISO 6892-1, and test on a calibrated UTM. You can review load frame and controller options on the Tensile Testing Equipment equipment page.

How Do Annealing, Normalizing, Hardening, and Tempering Affect Tensile Specimen Prep and UTM Setup?

These heat treatments shift strength and ductility in different directions, so preparation and test settings must change with them. Annealed steels are soft and ductile, so jaw pressure and serration choice should prevent jaw bites that trigger grip-end breaks. Normalized steels show more uniform properties across the section, which supports standard geometries. Quenched material is strong and less forgiving, while tempering restores toughness that helps the gauge section carry strain. Specimens should match ASTM E8 geometry and gauge length, for example 2 in (50 mm). After quench and temper, remove scale and decarburized layers along the loading axis to avoid notch effects. Maintain smooth fillet radii and deburr shoulders; small scratches across the gauge can shift fracture location. Plan UTM capacity from expected load. For a section of 0.05 in² (32 mm²) at 120 ksi (830 MPa) UTS, the peak force is about 6,000 lbf (27 kN). Choose wedge or hydraulic grips with jaw faces matched to hardness, and select a clip-on or video extensometer with suitable travel. Control strain rate as specified in ASTM E8 to capture yield and uniform elongation without shock loading. If you would like to review frame options, grips, and extensometry choices, you can explore details on the All Tensile Testing Equipment equipment page.

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