NEC MultiSync LCD1550V Manuel De L'utilisateur page 8

Quick Start
7. This LCD monitor is designed for use with a flexible arm.
Please use the attached screws (4pcs) as shown in the picture when
installing.
To meet fhe safety requirements, the monitor must be mounted to an arm
which guaranties the necessary stability under consideration of the weight
of the monitor.
The LCD monitor shall only be used with an approved arm (e.g. GS
mark).
Specifications
If using other screws, check depth of hole.
4 Screws (M4)
(MAX depth: 8.5mm)
–continued
Replace screws.
75mm
Weight of LCD assembly: 3.5 kg (MAX)
6
Thickness of Bracket (Arm)
2.0~3.2mm
Tighten all screws.