Enlarge image ↗The six-size BT set: six orange guides and six matching nuts. Illustration of the included sizes.
Tube Cutting Guides — BT Six-Size Set
Six orange PETG tube cutting guides with matching nuts for BT-20, BT-50, BT-55, BT-60, BT-70 and BT-80. $39.98 for the complete BT set.
- Six BT sizes included
- 6 guides + 6 matching nuts
- Orange PETG
- 3-fin & 4-fin marking positions
Get the six-size BT set
All six BT sizes are included. Choose how many complete sets you need; each set contains six orange guides and six matching nuts.
Current dispatch estimate: about 4 days after ordering.Usually 2–3 days from order to dispatch. Timing varies with order size and our production queue; shipping transit time is additional.Estimate updated October 5, 2026.
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All 6 included sizes
One guide and one matching compression nut in every listed size. The measurements are nominal tube outside diameters (OD), not the printed guide's outside diameter.
| Tube size | Tube OD (mm) |
|---|---|
| BT-20 | 18.6944 |
| BT-50 | 24.7904 |
| BT-55 | 33.655 |
| BT-60 | 41.5798 |
| BT-70 | 56.3118 |
| BT-80 | 66.04 |
Cutting and marking
- Match the tube. Choose the size that matches your tube's outside diameter. Slide it into position and tighten the matching compression nut to hold it.
- Use the front collar as your reference. Work with your own manual cutting tool suitable for the tube material.
- Mark the fin positions. Use the shared 0 reference, then the two 3 marks for a three-fin layout or the three 4 marks for a four-fin layout.
The three-fin pattern is spaced at 120°; the four-fin pattern is spaced at 90°. All marking positions are on the front collar. The compression nut rotates independently and has no fin-position scale.
Product details
- Included
- One guide body and one matching compression nut in each of six BT sizes; 12 printed pieces total
- Tube sizes
- BT-20, BT-50, BT-55, BT-60, BT-70 and BT-80
- Use
- Standalone manual cutting references and front-collar 3-fin / 4-fin marking positions
- Color and material
- Orange PETG guides and matching orange nuts
- Cutting tool
- Use your own cutting tool suitable for the tube material; no blade or cutter handle is included
- Price
- $39.98 USD per six-size set
- Product type
- Physical printed set; STL files are not included
Before you order
Match your tube name and outside diameter to the included-size list. Every BT set contains one of each of the six listed sizes.
For a different tube manufacturer or an uncertain fit, send us the measured outside diameter before ordering.