Metric Roofing Bolts With Square Nuts BZP
Metric Roofing Bolts With Square Nuts BZP - is backordered and will ship as soon as it is back in stock.
Metric Roofing Bolts With Square Nuts BZP - is backordered and will ship as soon as it is back in stock.
Stockist
Secure your roofing and lightweight construction projects with our versatile Grade 4.8 Mushroom Head Roofing Bolts. Supplied complete with compatible square nuts, these bolts are engineered to provide a firm hold on thin or soft materials. Finished in a durable Bright Zinc Plating (BZP), they offer a clean, professional appearance and essential corrosion protection for a wide variety of general repair and assembly tasks.
Perfect for Lightweight Assemblies
When working with thin sheet metal, plastics, or soft woods, standard hex bolts can often be too aggressive, crushing the material or pulling right through it. Our Grade 4.8 Mushroom Head Roofing Bolts are the specific solution for these delicate yet demanding applications. Whether you are fixing corrugated roofing sheets, assembling metal shelving, or securing cable trays, these bolts provide the gentle yet secure clamping force required.
Engineered for Surface Protection
The defining feature of this bolt is its "mushroom" head—a wide, domed profile that significantly increases the bearing surface area. By spreading the clamping load over a wider diameter, the bolt prevents the head from sinking into or damaging the material surface. This is critical when working with soft substrates like timber battens or thin-gauge metals where maintaining surface integrity is key. The cross-slot drive ensures they can be tightened easily with a standard screwdriver, making them accessible for both professional contractors and home DIY enthusiasts.
Ready-to-Use with Durability
Every bolt is supplied with a corresponding square nut, a traditional fastening choice that offers excellent grip and stability, particularly when used in pre-formed channels or tight spaces. Manufactured from Grade 4.8 Mild Steel, these bolts are tough enough for general fastening tasks where high-tensile strength is not required. The Bright Zinc Plated (BZP) finish adds a layer of sacrificial protection against rust and oxidation, ensuring your fixtures remain secure and looking clean in dry or sheltered environments.
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Metric Roofing Bolts With Square Nuts BZP
Frequently Asked Questions
Why do these bolts come with square nuts instead of hex nuts?
Why do these bolts come with square nuts instead of hex nuts?
Square nuts are traditional for roofing bolts because they have a greater surface area in contact with the part being fastened, which helps resist loosening. They also fit perfectly into many pre-made channels or "square" recesses found in cable trays and shelving units, preventing the nut from spinning while tightening.
Are Grade 4.8 bolts suitable for structural beams?
Are Grade 4.8 bolts suitable for structural beams?
No. Grade 4.8 is "mild steel" and is designed for low-stress, non-structural applications (like holding sheets together). For structural beams or heavy-load bearing connections, you should use Grade 8.8 High Tensile bolts or higher.
Can I use these for outdoor roofing sheets?
Can I use these for outdoor roofing sheets?
Yes, they are commonly used for this. However, because they are Bright Zinc Plated (BZP) rather than Hot Dipped Galvanised, they are best suited for dry environments or applications where they will be covered/sealed. For direct exposure to heavy rain or marine air, additional sealing (like plastic caps) or stainless steel alternatives are recommended.
