What is the difference between VESA 100×100 and VESA 75×75 mounting patterns?

VESA (Video Electronics Standards Association) defines the bolt pattern on the back of monitors for mount compatibility. VESA 100×100 has four mounting holes 100mm apart in a square pattern; VESA 75×75 has holes 75mm apart. Most monitors 22" and larger use VESA 100×100; smaller monitors (under 22") may use VESA 75×75. Nearly all commercial monitor arms support both patterns via a universal VESA adapter plate included in the arm kit. Some larger monitors (32"+) use VESA 200×100 or 200×200 — verify compatibility with larger screen mounts. OfficeFurniture2go.com carries monitor arms with universal VESA compatibility — call 1-800-460-0858.