Steel Screw # 2 M4 Metric - For Binding Post or Coils on Tattoo Machine

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Weight 0.002800
Brand Precision
Material 304 Stainless Steel

Binding Post or Coil Steel Screw # 2 M4 Metric - Tattoo Supplies

The Steel Screw #2 can be used as the lock screw in the binding post; this is used to keep pressure on the contact screw. You can also use this Steel Screw for the coil screws on the machine. The Steel Screw is M4 metric with a length of 13mm and a 4mm diameter of the threaded part. The thread length, or distance of each thread, is 0.7mm. This item is made of steel and is sold singularly, so make sure to choose a larger quantity if you want a few for backup. This Steel Screw works with the 2.5mm allen wrench.


  • Quantity: 1 screw
  • Material: steel
  • 13mm length
  • 4mm diameter of threaded part
  • 0.7mm thread length
  • For binding post or coils
  • Keep pressure on contact screw
  • Manufacturer: Precision

Related Products:

2.5mm Allen Wrench

Size Table

Standard Body Jewelry Measurements

The following webchart is a quick reference guide for standard body jewelry measurements and how to measure basic body jewelry. Please print this webchart to help measure your body jewelry accurately.

Size Reference Chart

Visit our PainfulPleasures Infocenter for additional body jewelry information. There, you will find detailed articles on standard body jewelry sizes, how to measure body jewelry, basic body jewelry, and more.

Standard Body Jewelry Threading

Ensure compatibility between standard (non-custom) PainfulPleasures body jewelry parts using the tables below. More information on threading, including custom thread patterns, can be found in our Threading Infocenter article.

Internally threaded jewelry has a threaded post on the top and/or end, which is then inserted into a threaded hole in the barbell shaft.

Internal Thread Patterns by Gauge


18g, 16g

14g, 12g


Internal Thread Pattern

0.8mm or 0.9mm



Externally threaded jewelry has a threaded post on the barbell shaft, which is then inserted into a threaded hole in the top and/or end.

External Thread Patterns by Gauge


18g, 16g

14g, 12g, 10g

External Thread Pattern



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