Bahco CS400 400mm Combination Square
For marking 45° and 90° - Built in level bubble and metal scriber - With both metric and imperial markings
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Bahco CS400 400mm Combination Square
The Bahco CS400 400mm Combination Square is a precision measuring tool designed for carpenters, joiners, and woodworking professionals who demand accuracy and durability. With its robust construction, dual metric‑imperial scale, and integrated spirit level, this square delivers reliable performance in every cutting, marking, or layout task.
Key Features
- Length: 400 mm (16 in) – a versatile size that fits most workbenches and projects.
- Material: High‑strength stainless steel body with hardened brass or steel scale markings for long‑term readability.
- Dual Scale: Metric and imperial graduations on the main blade, enabling quick conversions without a separate ruler.
- Spirit Level: Integrated bubble level in the head ensures accurate vertical alignment when marking or checking surfaces.
- Scriber: Built‑in metal scriber (Reißnadel) for clean, precise line cuts on wood, plywood, and other materials.
- Sliding Mechanism: Smoothly adjustable blade that locks securely at any position along the 400 mm range.
- Ergonomic Handle: Comfortable grip with a non‑slip surface for steady use during prolonged sessions.
Design and Construction Details
The CS400’s body is forged from premium stainless steel, providing resistance to corrosion and impact. The blade features a hard‑tipped edge that maintains sharpness even after repeated use on rough surfaces. The scale markings are etched or printed with high‑contrast ink, ensuring legibility under various lighting conditions.
The sliding head incorporates a precision locking screw that secures the blade at any desired length. This feature is especially useful when working with irregular board widths or custom cuts where exact measurements are critical.
Integrated Spirit Level
A small, yet highly accurate spirit level is mounted on the square’s head. The bubble indicator allows users to verify that a surface is perfectly vertical before marking or cutting. This dual functionality eliminates the need for a separate level tool, saving workspace and time.
Built‑In Scriber (Reißnadel)
The CS400 includes a metal scriber that slides along the blade’s edge. When pressed against wood or other materials, it produces a clean, straight line without gouging. The scriber is adjustable to accommodate different material thicknesses, ensuring consistent marking across varied substrates.
Applications and Use Cases
- Carpentry: Accurate layout of joinery, dovetails, and mortise‑tenon cuts.
- Joinery: Precise marking for paneling, cabinetry, and furniture assembly.
- Woodworking Projects: Layout of complex shapes, angles, and crosscuts in both hardwoods and softwoods.
- Construction: Quick checks for wall alignment, floor joist spacing, and framing accuracy.
Maintenance Tips
To keep the CS400 performing at its best, follow these simple care guidelines:
- Clean after use: Wipe the blade and scale with a dry cloth to remove sawdust or resin.
- Check the lock: Periodically tighten the sliding screw to ensure the blade stays in place during work.
- Inspect the spirit level: Verify that the bubble remains centered when the square is held flat; replace if the liquid has evaporated or become contaminated.
- Store properly: Keep the square in a dry environment to prevent rust on any exposed metal parts.
Why Choose the Bahco CS400?
The combination of precision engineering, dual measurement scales, and integrated level and scriber makes the CS400 an indispensable tool for professionals who require reliable accuracy. Its robust stainless steel construction ensures longevity, while the ergonomic design promotes comfortable handling during extended sessions.
Conclusion
The Bahco CS400 400mm Combination Square stands out as a versatile, high‑quality instrument that blends functionality with durability. Whether you’re laying out intricate joinery or verifying wall alignment, this square delivers the precision and reliability needed for top‑tier craftsmanship.

