Cube Knurled Brass Insert Nuts (Pack of 10)

Precision brass insert nuts with a knurled surface, perfect for heat-setting into 3D printed parts. Designed for strong, reusable threads in PLA, PETG, ABS, and more.

• Material: High-quality brass
• Available Sizes: M2, M3, M4, M5, M6
• Design: Deep spiral knurled surface for superior pull-out resistance
• Size Format: ID × L × OD
  • ID (Inner Diameter): Matches the thread size (e.g., M3 ≈ 3mm)
  • L (Length): Total height of the insert
  • OD (Outer Diameter): External diameter with knurling
• Installation: Heat-set into plastic or press-fit
• Applications: 3D printing parts, plastic enclosures, mechanical assemblies

💡 Installation Tip

For the best results when heat-setting into 3D printed parts:

• Hole diameter: Make the hole 0.2mm smaller than the insert's outer diameter (OD). This ensures a tight grip against the knurled surface.
• Hole depth: Make the hole 0.5-1 mm deeper than the insert length. The extra space at the bottom allows excess melted filament to deposit downward instead of flowing upward around the insert.

How to install (3 steps)

1. Use the right tool: a temperature-controlled soldering iron (220-240 V), ideally with a heat-set tip that matches the insert size. Print the hole first, sized from the table above.
2. Set the temperature: 10-20°C above your print temperature. As a start: about 225°C for PLA, 245°C for PETG and 265°C for ABS. M5 and M6 inserts may need a little more heat.
3. Press straight and flush: keep the part flat with the hole facing up. Rest the insert on the hole, put the tip in and let it sink straight down with light pressure until it is about 90% in. Lift the iron, press the insert flush with a flat metal tool and hold a few seconds while the plastic sets.

First time? Practice on a small printed test block before your real part. Resin prints do not melt, so glue inserts into resin parts with thick CA glue or epoxy.