[FREE Chart] Steel Gauge Thickness Explained: From 7 to 20 Gauge

Using this chart simplifies decisions when selecting sheet metal, avoiding miscommunication or costly mistakes. Whether you're ordering materials or checking tolerances on-site, having a printed or digital version close by will save you time and frustration.

Professional Tools for Accurate Metal Thickness Measurement

Accurate metal thickness measurement is a fundamental requirement across quality control, fabrication, and structural inspection. Whether you're verifying specifications during manufacturing or assessing material integrity in the field, a reliable metal thickness gauge ensures consistent results and regulatory compliance.

Our portfolio includes three advanced instruments designed for a wide range of applications and environments.

1. Ultrasonic Flaw Detector – QFD-200 Plus

The QFD-200 Plus is a high-performance ultrasonic flaw detector tailored for precision flaw detection, thickness evaluation, and weld inspection. Built with robust IP65-rated housing, this unit is engineered for both field and laboratory environments.

Key capabilities:

- Automated flaw analysis including depth, amplitude, and position

- DAC, TCG, and AVG support for accurate defect sizing

- Real-time color B-scan and unlimited video recording via USB

- Peak hold, auto-gain adjustment, and envelope display

- Advanced calibration tools for transducer and material settings

- Bluetooth-enabled reporting and wireless printing (optional)

With its broad velocity range and exceptional resolution, the QFD-200 Plus is ideal for use in aerospace, petrochemical, and structural engineering sectors where precision and reliability are critical.

2. Electromagnetic Thickness Gauge – QTG V

Designed for non-contact, non-invasive measurements, the QTG V electromagnetic thickness gauge provides a highly efficient alternative to conventional ultrasonic devices, particularly for coated or corroded surfaces.

Highlights include:

- Coupling gel-free operation for conductive metals

- E-E (Echo-Echo) mode for accurate readings through paint or coatings

- A-scan and B-scan modes for advanced evaluation

- High-temperature capability up to 500°C

- Internal memory for 10,000 data points with USB output

- Compact, durable design with a vivid 320x240 color TFT display

The Electromagnetic Thickness Gauge – QTG V is exceptionally suited for industries such as shipbuilding, metallurgy, energy, and process manufacturing where access conditions and coatings can complicate traditional inspection methods.

3. Ultrasonic Thickness Gauge – QTG IV

The QTG IV is a versatile ultrasonic thickness gauge designed to measure metallic and non-metallic materials with high accuracy. It supports both P-E (Pulse-Echo) and E-E (Echo-Echo) modes, allowing measurement through coatings without the need for material stripping.

Core features:

- High-resolution readings with 0.01mm / 0.001 in accuracy

- Automatic probe calibration and identification

- Data logging capacity of 10,000 readings across 100 files

- USB interface for seamless data transfer

- Multiple inspection modes including average, difference, and limit mode

- Wide measurement range: 0.65–400.0 mm (T-E), 3.00–25.0 mm (E-E)

Ultrasonic Thickness Gauge – QTG IV is recommended for precision thickness gauging in applications such as aerospace components, pipelines, structural elements, and composite materials, ensuring consistent material performance over time.

Final Thoughts

Understanding steel gauge thickness is more than just knowing numbers, it's about making informed decisions that impact safety, durability, and cost. Whether you're selecting 10 gauge steel for structural strength or 18 gauge for lighter fabrication, accuracy matters.

A well-structured gauge thickness chart and the right inspection tools can help you avoid costly mistakes and meet project specs with confidence. From general fabrication to advanced flaw detection, using reliable instruments ensures your materials perform as expected.

If you’re ready to upgrade your measurement capabilities, we invite you to explore our full range of thickness gauges. Each model is designed with precision, durability, and ease of use to support your quality control needs.