Auto-Lock 18mm Snap-Off Blade Utility Knife
$9.21 each, as low as $6.26 at 100 or more

Best for: Cutting carpet, drywall and other heavy materials with a snap-off blade knife.
Price each, by quantity
- In stock. Orders placed by 2 PM ET on business days ship the same day.
- Free standard US shipping on orders of $49 or more after discounts.
- 30-day returns on unused items.
Purchase orders and Net-30 on approval. W-9s and tax-exempt orders on request. Quotes: cs@hydestore.com or 508-916-6442. Reordering a list? Quick order.
What it does
Utility knife with an 18 mm snap-off blade and a one-piece auto-lock. It has a high-impact polystyrene body and a stainless steel blade track. It comes with 3 blades (24 points) and stores two spares.
How to use it
- Set the shortest blade reach that clears the material and lock it.
- Snap off a segment as soon as the cut stops being clean, using the built-in breaker.
- Snap segments away from your body into a sharps container.
Specifications
- Brand and model
- Hyde 42030
- SKU
- H-42030
- UPC
- 079423420306
- Dimensions
- 18 mm
- Product type
- Blade
Common questions
How many edges per blade?
Eight. An 18 mm blade has eight snap-off points, so the three included blades give 24.
What is the auto-lock?
Sliding the blade out clicks it into a locked detent without a separate screw step. The screw-lock 42050 clamps harder.
What is the blade breaker?
A slot in the knife that grips a dull segment so you can snap it off square.
Does the blade retract by itself?
No. For a self-retracting blade, use the Switchblade knives 42067, 42062 or 42056.
Need it for a different job?
- 25mm Snap-Off Blade Utility Knife with 42051For deep single-pass cuts
- 18mm Snap-Off Blade Utility Knife with 42050For heavy side-loaded cuts



