Guard rail is roll-formed from the same coil stock as the tube range and hot-dip galvanized after forming, so the cut edges and bolt slots are covered rather than left bare.

Both profiles are made: W-beam, the two-corrugation section that carries most highway runs, and thrie-beam, the three-corrugation section used where a higher containment level is specified or where the barrier fronts a bridge parapet. Each is rolled in 2.67 mm and 3.43 mm.

Panels lap one corrugation at every splice, so a 4.32 m panel covers 4.00 m of run — order on effective length, not on panel length, or a job comes up short. Posts, spacer blocks, bolts and end terminals are supplied with the beam so a run arrives complete.

Applications

Motorway and highway barriers
Bridge approaches and parapets
Median and verge protection
Industrial site roads
Car park and access road edges

Sectors supplied

Highways and infrastructure
Construction
Civil contracting

Specifications

Sizes and weights

Figures as published in our catalogue. Tolerances are held to the standard named on each table.

Guard rail beam — sections and running weight

AASHTO M180, hot-dip galvanized to ASTM A123

Guard rail beam — sections and running weight — AASHTO M180, hot-dip galvanized to ASTM A123
Section	Thickness		Section (mm)		kg/m
Section	mm	gauge	Depth	Effective width	kg/m
W-beam	2.67	12	83	312	10.12
W-beam	3.43	10	83	312	13.01
Thrie-beam	2.67	12	83	508	15.17
Thrie-beam	3.43	10	83	508	19.49

Class A carries 550 g/m² of zinc, Class B 1000 g/m², both measured over the two surfaces. Running weights are calculated from the developed width of the section.

Guard rail panels and posts

AASHTO M180

Guard rail panels and posts — AASHTO M180
Item	Dimensions		Notes
Item	Size	Effective length (m)	Notes
W-beam panel	4.32 m overall	4.00	Standard run panel, 8 bolt slots
W-beam panel	3.81 m overall	3.50	Short panel for tighter post spacing
Sigma post	130 × 65 mm	—	1.8 m to 2.2 m driven length
C post	120 × 55 mm	—	Alternative to sigma where specified
Spacer block	To post section	—	Sets the beam off the post face

Panels lap one corrugation at each splice, so the effective length is shorter than the panel itself. Post spacing is set by the containment level the road authority specifies.

Gallery