Blackbutt 40mm Stair Nosing

40mm Timber Stair Nosing

40mm thick solid timber stair nosing, designed to transition the stairs into your finished floor at the top of open house stairs. See our stair configurator for custom floor finishes and custom strings to match.

Dimensions & Profile:

• Thickness: 40mm
• Width: 110mm
• Overhang/Nosing: 20mm
• Front Edge: Attractive 6mm pencil round nose profile
• Underside: Features a 30mm wide riser groove precision-milled to securely accommodate standard 30mm thick top riser for open house stair
• Floor Finish: Premade for a standard 12mm floor finish, with flexibility to be packed up using packers or cut down on-site to suit varying upper floor thicknesses

This nosing is designed for the top step of closed housed stairs (traditional enclosed designs with visible strings) or closed sawtooth stairs (cut stringer styles with invisible strings), providing a professional finish where the staircase meets the upper floor. It integrates seamlessly with our 40mm standard treads and 30mm risers for a cohesive look.

Key Benefits:

• Versatile adjustment via packing or cutting for custom floor fits
• Easy installation with pre-machined groove for quick riser fitting
• Smooth, sanded surfaces ready for your choice of stain, oil, or clear finish

Available in both 1m and 1.5m lengths to suit your project. 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.