Why Cope Cuts Matter
If you've ever tried to fit a tube into a junction freehand — scribing with a grinder, cutting by eye, grinding again — you know how much time gets wasted chasing a tight fit on guesses. A sloppy cope means gaps, more filler, weaker joints, and a finished product that looks amateur even under a good bead.
Tube notching templates solve that problem at the layout stage, before a single cut is made. Get the mark right, and the notch comes out right. It's that simple.
Whether you're building a roll cage for a race car, fabricating a header collector, or tying in a chassis brace, or standard exhaust and railing work, this guide walks you through exactly how to use a tube notching template to get clean, repeatable cope cuts every time.
What You'll Need
- Tube notching template (90°, 45°, 30°, or 60° — matched to your intersection angle)
- Scribe or marker
- Angle grinder, or bandsaw, or plasma cutter
- Deburring tool or flap disc
- Calipers or tape measure
- Safety glasses and gloves
Step 1: Identify Your Intersection Angle
Before you grab a template, you need to know the angle at which your tube is meeting the main hoop or collector. This is the most important step — using the wrong template angle is the most common mistake beginners make.
- 90° — perpendicular T-intersections, most common in chassis and roll cage work, balance tubes in exhausts, and hand rails.
- 45° — diagonal bracing, A-pillar bars, door bars, exhausts, railings
- 30° / 60° — tight-angle header primaries, lower chassis rails, angled strut bars, Y pipes in exhaust systems.
If you're unsure of your angle, mock up the tubes dry and measure with a digital angle finder or protractor before committing.
Step 2: Match Template ID to Your Tube OD
Tube notching templates are sized to the outside diameter of the tube you're notching. If your tube is 2 inches OD, grab the 2" template, pretty straight forward!
Keystone Met'L Co. carries templates in the most common sizes used in motorsport and fabrication. If you're working with metric tube, convert carefully — a 45mm tube is not the same as 1.75" and may require some extended hand fitting.
Step 3: Wrap and Align the Template
Slide the template around the tube you're going to notch and trace around the outside of the template. Place the template on the tube youre going to cut a hole in for flow (if applicable) and trace around the inside of the template. The template is designed to conform to the tube's surface. Key alignment tips:
- The centerline mark on the template should line up with the top-dead-center of your tube.
- Make sure the template sits square to the tube end — any rotation will throw off your cope.
- Hold it firmly or use a piece of tape to keep it from shifting while you scribe or trace.
Take your time here. Thirty seconds of careful alignment saves you ten minutes of grinding later.
Step 4: Scribe the Cut Line
Using a sharp scribe or a fine-tip marker, trace the cope profile onto the tube. Apply firm, consistent pressure and follow the template edge (inside or outside) without lifting. Go around the full profile in one pass if possible.
Once you remove the template, you should have a line showing exactly where material needs to be removed.
Step 5: Make the Cut
How you cut depends on your setup:
- Angle grinder with a cutoff wheel — cut just outside the scribe line, then clean up to the line with a flap disc. Takes more time but works fine for one-off cuts.
- Bandsaw — good for tight-angle copes where a hole saw won't reach. Requires a steady hand and a sharp blade.
- Plasma Cutter -- fairly self-explanatory, but one trick we recommend is to spray the inside of the tube with anti-spatter prior to cutting with plasma to avoid tough clean up after.
Whichever method you use, cut to the outside of your scribe line first, then sneak up on the final fit by trimming into perfection. You can always remove more material — you can't put it back...so we always recommend cutting a little large.
Depending on your tube wall thickness, the radius on your tube may interfere with making a perfect mate after cutting, in this case just continue to sand the radius down wherever there's contact until achieving perfect fit up. Usually in this case, any flat or squared areas on the notched end of the tube need to be sanded round.
We ALWAYS recommend cutting the notch and creating the perfect fit BEFORE trimming the remainder of the tube to desired length. Example....you need a 60-degree notched tube exactly 6 inches long. You cut your tube 6 inches then during final fit you remove 3/16 of material achieving perfect fit, then your tube comes up 3/16 short on the other end.
Leave Long - Cut to Perfect Fit- Cut Tube to Final Length
Step 6: Test Fit and Adjust
Offer the notched tube up to the main tube and check the fit. A well-executed cope should sit flush with no rocking and minimal gap around the full perimeter. Rotate the tube slightly and check from multiple angles.
If you have a gap on one side, mark it with a marker and remove a small amount of material with a flap disc or die grinder. Work in small passes. The goal is full contact around the joint before you ever strike an arc.
Step 7: Tack and Weld
Once you have a tight fit, tack in at least four points (12, 3, 6, and 9 o'clock) before running your full weld. This prevents the joint from pulling as heat cycles through the metal.
Common Mistakes to Avoid
- Using the wrong angle template — always verify your intersection angle before scribing
- Misaligning the centerline — a rotated template produces an asymmetric cope that won't sit flat
- Cutting too aggressively — sneak up on the final fit; don't try to nail it in one pass
- Skipping the test fit — always dry-fit before welding, no exceptions
- Cutting to exact length before creating perfect fit -- remember, we can always remove more material, but it's hard and time consuming to put it back once it's been removed.
- Forcing connection together -- don't force anything with pressure! if you make your notch cut, and the ends are making contact with your other tube and you feel the need to force the notch over the other tube, don't! Just trim more, sand down and round off flat and squared areas. Remove material where there's contact until perfect fit is achieved!
Get the Right Template for Your Project
Keystone Met'L Co. stocks tube notching templates in 30°, 45°, 60°, and 90° configurations hosting 7 sizes each from 1.5" up to 3" in .25" increments. Whether you're building a full roll cage, a set of headers or exhaust, or a custom chassis brace, or a railing, having the right template in your hand before you cut is the difference between a professional result and a frustrating afternoon.
Have a project you're working on? Tag us on social media @KeystoneMetL or send photos — we'd love to see what you're building!