Brass Front Binding Post - M4 & M3 Metric - Tattoo Machine Supplies

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Weight 0.009900
Brand Precision
Material Brass

M4 & M3 Brass Front Binding Post - Tattoo Machine Supplies

The Brass Front Binding Post is the piece of the tattoo machine that holds the contact screw. It is 16mm long and has a 4mm diameter for the hole that houses the lock screw. The hole for the contact screw to go through is 3mm in diameter.  To create the entire assembly for a complete front binding post, you will need to purchase Washer #1, Washer #2, Washer #3, Brass Contact Screw and either Screw #1 or Screw #2. Luckily, we carry all you need!


  • Quantity: 1 post
  • Size: 16mm long, 4mm hole for lock screw, 3mm hole for contact screw
  • Material: brass
  • Houses contact screw
  • Manufacturer: Precision

Related Products:

Screw # 1 Crystal Lock Screw
Screw # 2 Steel Screw
Washer # 1 Plastic Washer
Washer # 2 Steel Washer
Washer # 3 Plastic Washer
Brass Contact Screw

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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