Stanley STA010151 SM18 18mm Snap Off Blade Knife

If you’re constantly opening cartons, trimming sheet materials, cutting carpet underlay, shaping insulation, or scoring plastics, you need a knife that feels simple—but stands up to daily abuse. The Stanley STA010151 SM18 18mm Snap Off Blade Knife is designed as a dependable workhorse: lightweight in the hand, tough in the body, and fast to refresh when the edge dulls.

The impact-resistant ABS plastic body is built to handle knocks in tool bags, vans, and on-site environments without adding unnecessary weight. A multi-position slide button lets you extend the blade in controlled steps so you can match blade exposure to the material—minimal extension for tape and film, more reach for heavier packaging and board. Once set, the lock helps keep the blade stable for more confident cuts.

Practicality is where the SM18 earns its keep. The rear section removes to give access to the blade carrier and snapping slot, making it easy to snap off a worn segment and continue with a fresh edge. That’s not just convenience—it improves safety and finish quality, because forcing a blunt blade is one of the quickest ways to slip or tear materials. A pocket clip keeps the knife accessible when you’re moving between tasks.

This model uses standard 18mm snap-off blades, making replacements easy to source and cost-effective to keep stocked for trade use.

Safety and best practice

• Extend only the blade length you need for better control.

• Snap segments using the integrated snapper and dispose of segments safely.

• Retract the blade fully when not in use.

• Cutting tools may be age-restricted—store and supply responsibly.

Key Features

• 18mm snap-off knife for general cutting and trimming

• Impact-resistant ABS body for durability with low weight

• Multi-position slide lock for controlled blade extension

• Removable rear section for blade carrier access and snapping slot

• Pocket clip for easy carry

Specifications

• Blade width: 18mm

• Body material: ABS plastic

• Pack quantity: 1 knife