Women's Ra vs Rz Metrology | Surface Finish Engineer T-Shirt

100% Airlume Combed Ring-Spun CottonLightweight

  • Women's black t-shirt with Ra3.2 vs Rz16 roughness symbols and “If you know the difference” text.
  • STEM women's black tee with Ra3.2 vs Rz16 roughness symbols & “If you know the difference” text.
  • Side view of women's black tee with Ra3.2 vs Rz16 roughness symbols & “If you know the difference” text.
  • Back view of women's plain black t-shirt for engineers.
  • STEM women's navy tee with Ra3.2 vs Rz16 roughness symbols & “If you know the difference” text.
  • Side view of women's navy tee with Ra3.2 vs Rz16 roughness symbols & “If you know the difference” text.
  • Back view of women's plain navy t-shirt for engineers.
  • STEM women's white tee with Ra3.2 vs Rz16 roughness symbols & “If you know the difference” text.
  • Side view of women's white tee with Ra3.2 vs Rz16 roughness symbols & “If you know the difference” text.
  • Back view of women's plain navy t-shirt for engineers.
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€24,95 EUR
€24,95 EUR
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Design Story

Made for the engineer who knows Ra is just the average story — and Rz is where the real surface problems hide.

Any first-year engineering student can define Ra. It’s the arithmetic average. It’s the safe, comfortable number on every generic print. But Rz? Rz is the maximum peak-to-valley height. It’s the number that actually dictates whether your O-ring will seal or fail catastrophically under pressure. This design is a quiet gatekeeper. If someone reads your shirt and starts talking about contact surfaces and extreme deviations, you've found a peer. If they just stare blankly, you know exactly what level of tolerance they operate at. Deployed on our relaxed women's fit (Bella+Canvas 6400). A highly accurate piece of STEM clothing designed for those who understand the micro-mechanics of failure.

Best For

Best for women in quality, metrology, or precision machining who worry about peak-to-valley, not just the marketing Ra on the drawing.

  • Women in mechanical engineering.
  • Female CNC programmers.
  • Metrologists.
  • Quality leads who refuse to accept "good enough" on a technical drawing.

Gift Guide

A laser-targeted gift for female quality engineers, inspectors, and machinists who’ve explained Ra vs Rz more times than they can count.

The ultimate gift for the female senior engineer who sends drawings back to junior staff because the surface finish specs are "too generic." If she demands precision, this is her new uniform.

Product Specifications

The Effortless Everyday Tee.

Designed for comfort without compromising style.

  • Fit & Feel: Relaxed Fit – A loose, comfortable cut that drapes beautifully. Runs true to size.
  • Premium Fabric: 100% Airlume combed & ring-spun cotton (4.2 oz/yd²). Pre-shrunk to minimize shrinkage.
  • Durability: Side-seamed construction for a flattering, structured look that lasts.
  • Origin: Blank sourced from Nicaragua, Honduras or the US.
  • Printed on Demand: Printed by Printful after you order, with water-based DTG inks.

Model Reference: Bella+Canvas 6400 (The ultimate relaxed tee).

Washing Instruction

  • Wash 30C Icon

    Wash cold (30°C / 86°F), inside out, with similar colors.

    Use mild detergent. No bleach. No softeners.

  • No Bleach Icon

    Do not use bleach. It can damage fiber integrity.

    Tip: Use oxygen-based stain removers if necessary.

  • Tumble Dry Low Icon

    Tumble dry Low or Hang dry (Recommended).

    Optimum: Flat air dry to preserve fiber tension.

  • Iron Low Icon

    Iron on Low Heat if needed. Do NOT iron prints.

    Tip: hang dry to reduce wrinkles.

  • No Dry Clean Icon

    Do not dry clean. Chemical solvents damage prints.

  • Eco Ink Icon

    Water-based inks.

    A faint scent may be present after printing and typically dissipates after the first wash.

"Treat your gear like hardware. Maintain it."

Supply Chain Certifications (Component-Level)

grabNade holds no certification of its own, and no third-party certification is claimed for this blank.

• Blank: Bella+Canvas 6400, 100% Airlume combed and ring-spun cotton, 142 g/m².
• Printing: Printed on demand by Printful after you order, using water-based DTG inks.

Note: Any slight scent from the fixation agent is normal and disappears after the first wash.
More info: Supplier Certifications

Product Safety (EU / GPSR)

Age restrictions: For adults

EU legal guarantee of conformity: 2 years

Other compliance information: Meets the flammability level requirements.

Seller: Gabriel Weider EI (trading as grabNade), 320 rue Saint-Honoré, 75001 Paris, France. Contact: support@grabnade.com

Manufacturer and EU responsible person: SINDEN VENTURES LIMITED (Printful group, our print-on-demand production partner), Markou Evgenikou 11, Mesa Geitonia, 4002 Limassol, Cyprus. gpsr@sindenventures.com

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> Featured In

Ra vs Rz: What's the Real Difference?

Ra vs Rz: What's the Real Difference?

What is the real difference between Ra and Rz surface roughness? While Ra (Arithmetic Mean Roughness) provides a general average, Rz (Mean Roughness Depth) captures...

[ READ ARTICLE ]