Metal Stringers

A stringer is a frame of stairs. Stringers are used as a base for fixing stair treads. There are different types of stringers: mono stringers (a step is fixed on one side), central stringer (a step is fixed in the middle), double stringer (a step is fixed on both sides).

Choosing the right shape of stringer, the height and widths of steps can lead to a comfortable walking experience. The height of steps should not exceed 190 mm and the width should be around 250-290 mm.

Staircases are commonly made of U-profiles, square/rectangular tubes or sheet steel.

Technical characteristics of metal stringers

Element	Materials / control
Materials	Carbon steel, S235, S275, S355
Surface preparation	In accordance with EN ISO 8501-1, preparation grade P2, Surface preparation Sa2,5.
Anti-corrosion coating	C1-C5 The color may be selected from the RAL Color Chart according to the customer’s needs Coating: Powder coating up to 7 m in length Hot-dip galvanization up to 15m in length in accordance with LST EN ISO 1461 Thermal spray galvanization up to 12m in length in accordance with ISO 2063-1
Nondestructive inspection	Visual inspection (VT) Radiographic testing (RT) Ultrasound testing (UT) Magnetic particle test (MT) Penetrant testing (PT)