Blackbutt Sawtooth Stair 40mm String (pair)

40mm Sawtooth Timber Stair String

Please note photo of sawtooth string is not the correct timber species see second photo for actual timber species sample.

Elevate your staircase with our precision-machined 40mm thick solid timber sawtooth string, expertly crafted for strength, accuracy, and a clean modern look in any home. These strings are sold as a pair and delivered as a left-hand and right-hand string together. The tread pockets are routed the whole way through to prevent water pooling and rotting the timber.

Dimensions & Profile:

• Thickness: 40mm
• Going: 240mm or 250mm
• Rise options: 170mm, 175mm, 180mm, 185mm or 190mm
• Precision-cut sawtooth profile designed to suit our 40mm Open Treads

This string is made specifically for open riser sawtooth stairs, where the treads sit on the cut steps of the string. It works equally well as a wall string or outer string and pairs perfectly with our 40mm Open Timber Stair Treads for a clean, secure fit. These strings can also work with 30mm treads if you are just chasing some more rigidity in the string.

Perfect for both new builds and renovations, the 40mm construction delivers solid performance in family homes while giving a neat, continuous side profile that suits contemporary, coastal, or traditional designs.

Key Benefits:

• Easy assembly with accurately cut sawtooth steps for a straightforward tread fit
• Smooth, sanded surfaces ready for your choice of stain, oil, or clear finish

All products are delivered raw, pre-finished sanded to 100 grit.

Blackbutt, a premium Australian native hardwood (Eucalyptus pilularis), boasts a clean, uniform appearance with pale golden-brown to straw tones and a straight, even grain—occasionally accented by subtle gum veins for added rustic charm. Exceptionally durable and fire-resistant, with high density and strength, Blackbutt excels in high-traffic areas and is ideal for stair components that demand longevity and low maintenance. Its neutral palette complements contemporary and coastal  interiors, while its natural toughness makes it suitable for treads, stringers, risers, and handrails that stand up to everyday family use.