What Are Utility Knives?
Utility knives are compact cutting tools used for scoring and trimming materials on the jobsite and in the shop. With replaceable razor blades and pocket-friendly bodies, they’re a go-to for drywall, carpet, roofing felt, cardboard, plastic sheeting, and more.
Types of Utility Knives
- Retractable Utility Knives – Adjustable blade depth improves safety between cuts and helps control score lines on drywall and packaging.
- Folding Utility Knives – Pocket-carry designs that lock open like a pocketknife; great for technicians and on-the-go tasks.
- Replacement Blades – Standard, heavy-duty, hook, and specialty blades keep your knife cutting cleanly and reduce tear-out.
How to Choose the Right Knife
- Match the task: Use heavy-duty blades for dense material (roofing, carpet); standard blades for cartons and sheet goods.
- Consider safety features: Retractable sliders, folding locks, and blade-storage compartments reduce downtime and risk.
- Grip & ergonomics: Cushioned handles and textured bodies improve control and reduce fatigue during repetitive cuts.
Common Applications
- Drywall scoring and outlet cutouts
- Carpet, vinyl, and roofing underlayment
- Cartons, strapping, plastic film, and foam board
Safety & Care
- Retract or fold the blade between cuts; keep a fresh, sharp blade to prevent forcing the tool.
- Cut away from your body on a stable surface; wear cut-resistant gloves as needed.
- Dispose of used blades in a dedicated blade container.
Frequently Asked Questions
What’s the difference between retractable and folding utility knives?
Retractable models keep the blade in a fixed body and slide it in/out for depth control. Folding models lock open like a pocketknife for compact carry.
Which blade should I use for carpet or roofing?
Heavy-duty or hook blades grab and pull through thick or fibrous materials better than standard straight blades.
How often should I change blades?
Swap as soon as you feel resistance or tearing—fresh blades are safer and produce cleaner lines.
Do utility knives accept universal blades?
Most use standard trapezoid utility blades; always verify compatibility with your knife model.