SP Stair Treads

SP stair treads are manufactured in accordance with DIN 24531-1. For standardized stair treads, load-bearing bars with dimensions 30 x 2 mm, 30 x 3 mm and 40 x 3 mm are used. A perforated anti-slip nosing is welded to the front edge of the treads, which not only reduces the risk of slipping but also increases the static load capacity of the tread and visually highlights its front edge. The treads are equipped with side plates with a thickness of 3 mm and bolt holes. Standard tread dimensions are also supplied with an alternative side plate design – see image (more information in the attachment below). The tread dimensions and the hole spacing in the side plate are listed in the following table.

length L	+0	[mm]	width B	+5	[mm]	bearing bar [mm]	b [mm]	c [mm]	d [mm]	e [mm]	Permissible load [kN]	weight [kg/piece]
	-3			-5
600			240			30×2	55	70	120	85	1.5	4.2
			270				55	70	150	85		4.6
			305				55	70	180	90		5.1
800			240				55	70	120	85		5.3
			270				55	70	150	85		5.9
			305				55	70	180	90		6.5
600			240			30×3	55	70	120	85		5.2
			270				55	70	150	85		5.8
			305				55	70	180	90		6.5
800			240				55	70	120	85		6.6
			270				55	70	150	85		7.5
			305				55	70	180	90		8.3
1000			240				55	70	120	85		8.2
			270				55	70	150	85		9.1
			305				55	70	180	90		10.2
1200			240			40×3	55	70	120	85		11.7
			270				55	70	150	85		13.2
			305				55	70	180	90		14.7

Other dimensions available upon request.

Hexagon head bolts	M 12 x 35	ISO 4017 (DIN 933)
Hexagon nuts	M 12	ISO 4032 (DIN 934)
Washers (2 pcs)	M12	ISO 7089 (DIN 125A)

During installation, it is necessary to check whether there is excessive clearance between the side plate of the stair tread and the stringer due to tolerances of these structures. If so, this clearance must be eliminated using spacer washers before bolting the stair treads to the stringers. This prevents damage to the welds of the stair treads.