Structural bolts & fasteners

Purlin & girt bolts

Galvanized M12 and M16 purlin bolts with nuts and washers, class 4.6 or 8.8 – for purlin laps, girt cleats, bracing and flange braces in steel buildings.

澳大利亚 / 新西兰美国欧洲

索取报价技术规格

Lapped Z purlins bolted to a rafter cleat

M12 purlin bolts with flat washers.

M12 and M16, class 4.6 or 8.8
Hot-dip galvanized, matching nuts and washers
Lengths for single, lapped and sleeved purlins
Packed per building, per bay
Flange-brace and bridging bolts included
Matched to C / Z purlin hole patterns

What it is

Purlins and girts are connected to rafter and column cleats with small bolts – usually M12 for light sections and M16 for heavier purlins and laps. Every steel building uses thousands of them, so getting the count, length and finish right saves days on site.

World Steel calculates the bolt list from the 3D model and packs purlin bolts by building and by bay, together with the C and Z purlins.

Typical bolts

Purlin and girt bolts
Use	Bolt	Notes
Purlin / girt to cleat	M12 × 30 – 35, class 4.6	one or two plies
Lapped Z purlins	M12 / M16 × 40 – 45	three plies at the lap
Heavy purlins, eave struts	M16 × 40 – 50, class 8.8	per design
Flange braces, sag rods	M12 × 30	bracing to purlin flange
Bridging	M12 × 30 – 40	bridging bracket to web

Finish

Hot-dip galvanized bolts, nuts and washers match the Z275 – Z450 galvanizing of the purlins, so the connection does not become the first point of corrosion.