HONGDUI HD38 TrueMark T Square Measuring Ruler
High-Precision "Line Master" System: Features a precision sliding block that locks securely into place, allowing for flawless parallel scribing and repeatable marking along the length of the workpiece.
Modular 2-in-1 Design: The T-handle can be detached, allowing the tool to transform from a professional T-square into a standalone high-precision straight edge.
Perfect 90° Reference: The handle is CNC-machined to ensure a dead-square 90-degree reference against the edge of your board, eliminating the inaccuracy of traditional stamped rulers.
Circle & Arc Drawing: The sliding block includes a dedicated pivot point, enabling the ruler to function as a large-scale compass for drawing accurate circles and arcs.
Available in Multiple Lengths: The HD38 series is offered in various sizes, typically ranging from 200mm to 800mm (8" to 32"), to suit everything from small furniture components to large panels.
Anti-Creep Locking Mechanism: The knurled brass locking nut provides a secure, tool-free hold on the sliding block, ensuring it won't shift during marking.
About HD38
Redefining Your Layout: The HD38 T Square Ruler System
Stop double-checking your marks. The HONGDUI HD38 serves as a high-efficiency layout powerhouse that eliminates the guesswork from your bench work. By locking its heavy-duty T-style shoulder flush against your workpiece, the integrated micro-hole guide allows your mechanical pencil to glide effortlessly for seamless, parallel lines. Whether layout out mortise-and-tenon joints or breaking down sheet goods, the HD38 slashes your layout time while doubling your precision.
HD38
High-grade 6061 Aluminum Alloy
Universal Precision Scribing / 1.0mm Micro-Hole Indexing Layout
1 * HD38 T Square Ruler, 1 * Setup Adjustment Tool
FAQ
Check out the most common questions our customers asked.
What is the difference between the HD38 and the HD38V?
HD38 (Standard): Features a fixed 90-degree aluminum handle. It is designed for rock-solid right-angle layouts and parallel scribing.
HD38V (Adjustable): Features a rotating handle that allows for precision 0-90° angling. It includes a knurled brass knob for positive, drift-free locking at any angle, essentially acting as a high-precision protractor and T-square in one.
What is Hadfield Steel and why is it used for the ruler body?
Hadfield steel (manganese steel) is used for its superior toughness and shock resistance compared to standard spring steel. It has a hardness of approximately HRC 50 and is finished with a Titanium coating for extreme wear resistance, ensuring the ruler doesn't lose its straightness or surface quality over time.
What sizes are available?
The HD38 series is available in multiple lengths:
Metric: 200mm, 400mm, 600mm, and 800mm.
Imperial: 8 Inches, 16 Inches, 24 Inches, and 32 Inches.
What is the purpose of the Line Master sliders?
The Line Master is a modular sliding block that sits on the ruler. It allows for:
Repeatable Marking: Lock the slider at a specific measurement to mark the same distance on multiple workpieces.
Parallel Scribing: Press the slider against the edge of your board and slide the ruler to draw a perfectly parallel line.
Compass/Circle Drawing: The sliders can be used as pivot points for drawing large arcs and circles.
Why are there different colored sliders (Blue/Orange)?
Different colored sliders are often included in longer sets (600mm+) to help woodworkers distinguish between different presets or stops when performing complex layout tasks that require multiple measurements.
How accurate are the markings?
The HD38 features dual-scale laser-etched markings on both the front and back of the blade. This allows for clear readability even in awkward positions. The markings are mathematically aligned with the CNC-machined handle to ensure a perfect 90° reference.
Is the ruler handle removable?
Yes. The handle can be detached, allowing the Hadfield steel ruler to be used as a standalone straight edge or for layout tasks where the T-head would be in the way.
How do I calibrate the HD38V angle?
For the adjustable HD38V, you can use the laser-etched degree scale on the handle assembly. For critical accuracy, it is recommended to verify the 0° (90° to the handle) and 45° settings with a high-precision engineer's square during your initial setup.
Does the titanium coating protect against rust?
Yes, the titanium coating is highly resistant to corrosion. However, it is still best practice to wipe the ruler down with a dry cloth after use. If you work in a high-humidity environment, a light application of camellia oil or a dry wax will provide extra protection for the exposed steel edges.
How do I clean the Line Master sliders?
If the sliders become gritty or difficult to move, it is likely due to fine sawdust trapped in the track. Remove the slider, blow out the track with compressed air, and wipe the ruler's edge with a bit of denatured alcohol. Avoid using oil on the ruler body, as it will attract more dust.