Johnson Precision Combination Square 400EM-S 16 Inch CNC Machined Head Stainless Steel Blade (Acrylic Level Vial Etched Markings Layout Tool)

Johnson 400EM-S 16-Inch Precision Combination Square for Woodworking Layout

The Johnson 400EM-S 16-Inch Precision Combination Square provides multi-angle alignment, depth measurement, and leveling performance for professional construction layout work. Constructed with a CNC-machined cast zinc head and a corrosion-resistant stainless steel blade, this measurement tool functions as a try square, miter square, depth gauge, and marking gauge. The permanently etched graduations ensure permanent readability across demanding jobsite conditions without fading over prolonged structural use.

Best Used For:

• Woodworking Layout: Marking true 90-degree square edges and precise 45-degree miter cuts on framing timber.
• Depth Gauge Calibration: Measuring mortise depth and setting table saw blade elevation with exact vertical accuracy.
• Material Scribing: Drawing parallel reference lines along metal stock or sheet goods using the hardened steel scriber.

Key Performance & Safety Features

• CNC Machined Head: Computer-milled cast zinc body guarantees straightness and true right-angle square alignment.
• Auto-Lock Blade Assembly: Spring-loaded locking bolt secures blade positioning quickly for rapid layout measurements.
• Etched Stainless Blade: Rustproof blade features permanently etched 1/8 inch, 1/16 inch, 1/32 inch, and 0.039 inch graduations.
• Built-In Acrylic Level: High-impact acrylic vial provides clear, immediate plumb and horizontal level checks.
• Hardened Screw-In Scriber: Steel marking scriber stores securely inside the head housing to prevent accidental loss.
• E-Coated Protective Finish: Black electro-deposited finish shields the heavy-duty zinc head against jobsite impact and corrosion.

What's Included

• (1) 16-Inch Stainless Steel Blade with Permanent Etched Graduations
• (1) Cast Zinc Head with Acrylic Level Vial
• (1) Hardened Screw-In Steel Scriber

Technical Specifications

Pro-Tip: To maintain smooth blade adjustment over time, periodically clean sawdust out of the blade's center groove with a stiff nylon brush and coat the blade with a thin layer of paste wax to reduce friction and eliminate binding.