Starrett Automatic Center Punch with Adjustable Stroke — 5-Inch Length, 9/16-Inch Diameter, Knurled Steel Handle

Precision marking, no hammer needed

The Starrett Automatic Center Punch is a purpose-built tool for creating repeatable indentations without a separate hammer. With a 125 mm (5 inch) length and a 14 mm (9/16 inch) diameter, the tool sits comfortably in hand and delivers a controlled mark that guides your drill or punch. Built for metalworking and assembly tasks, its all-steel construction balances lightness with durability, making it a dependable addition to professional workshops and hobby spaces alike.

How it works

When downward pressure is applied, an internal mechanism automatically delivers a strike, producing a clean, consistent mark. The knurled cap adjusts the stroke force, allowing you to tailor the indentation depth to different materials—from soft plastics to tough metals. A reliable spring tension maintains a stable point with every strike, helping you repeat marks with confidence.

Construction notes highlight heat-treated drives and a design optimized to absorb repetitive shocks. The corrosion-resistant steel body is built to withstand the rigors of daily shop use, including exposure to oils, dust, and coolants. The result is a durable tool that keeps its edge and accuracy over time.

Key benefits

• Heavy-duty steel construction resists wear and corrosion for long-lasting performance.
• Automatic mechanism enables one-handed operation, freeing the other hand to steady work.
• Adjustable force cap lets you tailor indentation depth for different materials.
• Consistent spring tension ensures uniform depth and size of marks.
• Versatile across metals, plastics, and wood for a wide range of workshop tasks.

Practical uses in real-world settings

In metalworking, technicians use the tool to locate centers before drilling or tapping, without needing a separate hammer. In electronics enclosures or woodworking projects, the indentation guides cuts and holes with accurate alignment. The combination of a sharp marking point and a precise indent helps improve drill alignment and overall workflow in busy shops.

• Locating centers and starting holes on sheet metal, extrusions, or plastics.
• Marking precise drill points for alignment during assembly or fabrication.
• Preparing surfaces for accurate punching, riveting, or fastening operations.

Starrett’s heritage reaches back to 1880, and this center punch is designed for consistent performance in professional environments, education settings, and hobby shops. While outcomes depend on material, technique, and care, users commonly experience reliable marks that help streamline drilling and assembly workflows.