WS grating stair treads (T1–T6)

Six tread types

WS stair tread types
Type	Fixing	Ends	Nosing
T1	Welded	Banded ends	No nosing
T2	Bolted	Holed end plates	No nosing
T3	Welded	Banded ends	Checker-plate nosing
T4	Bolted	Holed end plates	Checker-plate nosing
T5	Welded	Banded ends	Abrasive anti-slip nosing
T6	Bolted	Holed end plates	Abrasive anti-slip nosing

Matrix of WS stair tread types T1 to T6 — WS stair treads T1–T6: fixing type × nosing type.

The choice of nosing depends on use: checker plate for robust industrial stairs, abrasive yellow nosing where a visible, high-grip edge is needed – public, outdoor and wet stairs. If you are unsure which to use, our engineers will recommend one.

Recommended widths

Recommended tread width (mm) by bearing bar pitch
Bar pitch	Types	Widths (mm)
30 mm pitch	T1–T6	125 · 155 · 185 · 215 · 245 · 275 · 305
40 mm pitch	T1, T2, T5, T6	125 · 165 · 205 · 245 · 285 · 325
40 mm pitch	T3, T4	115 · 155 · 195 · 235 · 275 · 315
60 mm pitch	T1, T2, T5, T6	185 · 245 · 305
60 mm pitch	T3, T4	155 · 215 · 275

Tread length is the distance between the outside faces of the end plates, tolerance 0 / −3 mm; width ± 3 mm. End plates and nosing are welded with seams of 3 mm or more at every bearing bar.

Maximum length

Maximum tread length (mm) by bearing bar size
Bar pitch	25 × 3	25 × 5	32 × 5	40 × 5
30 mm	550	900	1300	1600
40 mm	450	750	1200	1500
60 mm	–	550	850	1350

Side plates use 65 × 5 mm flat bar with a Ø14 hole and a slotted hole for M10 or M12 bolts; the bearing bars can be mitred to the stair angle on request.

Installation

Bolted treads (T2, T4, T6) are fixed to the stringer with two bolts at each end through the holed end plates; welded treads (T1, T3, T5) are welded to stringer brackets. Stairs from 30° to 90° can be made with matching stringers, landings and handrails.

市場別の規格と要求事項

World Steelが本製品の設計・製作・書類作成に適用する基準――および各市場における主な寸法・荷重要件。

米国

OSHA 1910.25Stairways
IBC 2021 §1011Stairways
ANSI/NAAMM MBG 531Metal Bar Grating Manual
NAAMM AMP 510Metal Stairs Manual

Riser / tread (OSHA): Riser ≤ 9.5 in, tread depth ≥ 9.5 in

United Statesの規格一覧 →

豪州 / NZ

AS 1657-2018Fixed platforms, walkways, stairways and ladders
AS 4586Slip resistance of pedestrian surfaces

Going / riser (AS 1657): Going 215–355 mm, riser 130–225 mm

Australia & New Zealandの規格一覧 →

欧州

DIN 24531-1Gratings as stair treads – steel
EN ISO 14122-3Stairs, stepladders and guard-rails

Step formula: 600 mm ≤ g + 2h ≤ 660 mm (EN ISO 14122-3)

Europeの規格一覧 →

参考用の概要です――プロジェクト仕様書、採用される基準の版、所轄官庁の判断が優先されます。

表面処理	規格 / 備考
Hot-dip galvanised (G)	ASTM A123 · AS/NZS 4680 · EN ISO 1461
Paint coated (PP)	Blast or pickle + paint system to ISO 12944 / AS/NZS 2312.1 / SSPC
Duplex with coloured nosing	Galvanised + paint; contrasting nosing per project

表面処理

規格 / 備考

Hot-dip galvanised (G)

ASTM A123 · AS/NZS 4680 · EN ISO 1461

Paint coated (PP)

Blast or pickle + paint system to ISO 12944 / AS/NZS 2312.1 / SSPC

Duplex with coloured nosing

Galvanised + paint; contrasting nosing per project

よくある質問

Which tread type should I choose?

Bolted types T2, T4 and T6 are easiest to install and replace. Choose checker nosing (T3/T4) for industrial use and abrasive nosing (T5/T6) where a visible high-grip edge is needed.

Can you make non-standard treads?

Yes – treads can be made from any WS grating and to any width or length within the bar capacity.