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Nuts, Bolts & Washers

Metric screws, nuts and washers from M2 to M6 for robots, drones, 3D printers and electronics enclosures, mostly in packs of 10. Thread size, length, material...

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Nuts, Bolts & Washers

Metric screws, nuts and washers from M2 to M6 for robots, drones, 3D printers and electronics enclosures, mostly in packs of 10. Thread size, length, material and pack size are in every title.

Which screw to choose

  • Allen socket head: compact head and strong hex drive, the usual choice for robot and drone frames
  • Button head: low, rounded head for covers and panels
  • Countersunk (CSK): sits flush in a countersunk hole
  • Phillips pan head and with washer: easy to fit with a common screwdriver
  • Grub screws: lock a gear, pulley or wheel onto a shaft
  • Brass threaded inserts: give 3D printed and plastic parts a strong metal thread

Materials: 12.9 grade black steel is the strongest; SS202 and SS304 stainless steel resist rust; mild steel (MS) is the low-cost everyday choice.

Tip: measure screw length from under the head (for countersunk screws, the whole screw). Leave at least 2 to 3 threads showing past the nut.

Nuts, Bolts & Washers

About Nuts, Bolts & Washers

Metric screws, nuts and washers from M2 to M6 for robots, drones, 3D printers and electronics enclosures, mostly in packs of 10. Thread size, length, material and pack size are in every title.

Which screw to choose

  • Allen socket head: compact head and strong hex drive, the usual choice for robot and drone frames
  • Button head: low, rounded head for covers and panels
  • Countersunk (CSK): sits flush in a countersunk hole
  • Phillips pan head and with washer: easy to fit with a common screwdriver
  • Grub screws: lock a gear, pulley or wheel onto a shaft
  • Brass threaded inserts: give 3D printed and plastic parts a strong metal thread

Materials: 12.9 grade black steel is the strongest; SS202 and SS304 stainless steel resist rust; mild steel (MS) is the low-cost everyday choice.

Tip: measure screw length from under the head (for countersunk screws, the whole screw). Leave at least 2 to 3 threads showing past the nut.

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