Safety glasses 3M SF420AF — plastic frame, transparent polycarbonate lenses, black

3M SF420AF safety glasses feature a lightweight plastic frame and clear polycarbonate lenses with an anti-fog coating and a built-in +2.0 reading diopter. The lenses absorb 99.9% of UVA and UVB radiation up to 380 nm and are impact resistant, meeting CSA Z94.3-2007 and ANSI Z87.1-2010 requirements. The SecureFit design uses Pressure Diffusion Temple Technology to let the temples naturally adapt to individual head shapes for a secure, comfortable fit suitable for industrial and DIY tasks such as assembly, construction/renovation, and grinding.

Advantages

The SF420AF combines lightweight construction (less than 1 ounce) with flexible temples that self-adjust without manual settings, reducing the need to stock multiple frame sizes. Anti-fog coating maintains visibility in hot or humid conditions, while polycarbonate lenses offer impact resistance and block nearly all UV radiation. A +2.0 reading diopter helps with close-up detail work and reading small print without adding separate reading lenses.

Suitable for

• Assembly and manufacturing tasks
• Construction, renovation and on-site maintenance
• Grinding, sanding and similar detail work
• DIY projects and general workshop use
• Situations requiring lightweight, impact-resistant eye protection with reading aid

When it may not be suitable

These glasses are not prescription eyewear; users who require specific corrective prescriptions should use prescription safety glasses or insert prescription lenses. They may not provide optimal protection for chemical splashes or environments requiring sealed goggles or full-face protection.

Key specifications

• Frame material: plastic
• Lens material: polycarbonate with anti-fog coating
• Reading diopter: +2.0
• UV protection: absorbs 99.9% of UVA and UVB up to 380 nm
• Standards: meets CSA Z94.3-2007 and ANSI Z87.1-2010
• Weight: less than 1 ounce (lightweight)
• Available lens options: clear, anti-scratch, anti-fog/anti-scratch, optional Scotchgard Protector
• Frame colour: black

How to use

Place the glasses on so the temples rest comfortably over the ears; the Pressure Diffusion Temple Technology will allow the temples to conform to the wearer’s head for a secure fit. Clean lenses with a soft, lint-free cloth and manufacturer-recommended cleaner; avoid abrasive materials that can damage coatings. Use the anti-fog properties by keeping lenses free of heavy dirt or oils that reduce coating effectiveness. Inspect the glasses before use and replace them if lenses are scratched or the frame is damaged.

What to consider before purchase

• Whether you need prescription correction in addition to the built-in +2.0 diopter
• Whether your work requires sealed eye protection against liquids or chemicals
• Compatibility with other personal protective equipment, such as helmets or hearing protection
• Preferred lens treatments (anti-scratch, anti-fog, Scotchgard Protector)

Usage recommendations

For reliable performance, choose the SF420AF when you need lightweight impact protection with a reading aid. Store the glasses in a protective case when not in use, clean lenses regularly with non-abrasive cleaner, and replace the eyewear if impact damage or deep scratches occur.