Piercing

Standard Gauge

Standard Post Length

Standard Hoop Diameter

Nose Piercing

18G(1mm); 16G(1.2mm) and 20G(0.8mm) are also commonly used

1/4"(6mm) , 5/16"(8mm)

5/16"(8mm), 3/8"(10mm)

Septum Piercing

16G(1.2mm); 14G(1.6mm) and 18G(1mm) are also commonly used

5/16"(8mm), 3/8"(10mm)

Lip Piercing

14G(1.6mm) or 16G(1.2mm)

5/16"(8mm), also available in 1/4"(6mm) and 3/8"(10mm)

3/8"(10mm),1/2"(12mm)

Monroe Piercing

16G(1.2mm)

5/16"(8mm), also available in 1/4"(6mm), and 3/8"(10mm)

3/8"(10mm),1/2"(12mm)

Forward Helix or Thin Helix

16G(1.2mm), 18G(1mm)

1/4"(6mm)

1/4"(6mm)

Cartilage / Tragus / Helix / Rook / Daith

16G(1.2mm), 18G(1mm)

1/4"(6mm), 5/16"(8mm)

5/16"(8mm), also available in 1/4"(6mm) and 3/8"(10mm)

Conch

16G(1.2mm), 18G(1mm)

1/4"(6mm), 5/16"(8mm)

3/8"(10mm), 1/2"(12mm)

Ear Lobe Piercings

20G(0.8mm), 18G(1mm) and 22G(0.6mm) are also commonly used

1/4"(6mm), also available in 5/16"(8mm)

5/16"(8mm), also available in other sizes 

Industrial Barbell

14G(1.6mm); 16G(1.2mm) is also commonly used

1 1/2" (38mm); size varies

Tongue Piercing

14G(1.6mm)

 9/16"(14mm), 1/2"(12mm), 5/8"(16mm)

5/8"(16mm)

Eyebrow Piercing

16G(1.2mm); 14G(1.6mm) is also commonly used

5/16"(8mm), also available in 3/8"(10mm) and 1/2"(12mm)

5/16"(8mm), also available in 1/4"(6mm), 3/8"(10mm) and 1/2"(12mm)

Belly / Navel Ring

14G(1.6mm)

3/8"(10mm), 1/2"(12mm)

3/8"(10mm), 1/2"(12mm)

Nipple Piercing

14G(1.6mm), 16G(1.2mm)

3/8"(10mm), 1/2"(12mm), 9/16"(14mm)

9/16"(14mm), also available in 5/16"(8mm), 3/8"(10mm), and 1/2"(12mm)