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Trade-quantity nuts, bolts and washers for ductwork installation — the M8 and M10 fixings that every ventilation first-fix runs on. Most lines are supplied in boxes of 100, so you are stocked for the whole job rather than buying blister packs from a merchant.
The range covers:
Pair them with threaded rod and duct clips to hang spiral ducting quickly and securely. Stocked items ordered by 3pm ship next day, and UK mainland delivery is free on orders over £400 ex VAT.
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Reliable fixings are fundamental to a safe, airtight, and durable ductwork installation. Alpha Air supplies the complete range of nuts, bolts, washers, screws, and rivets used by ventilation engineers and sheet-metal workers throughout the UK.
M6 and M8 hex-head bolts with matching flange nuts for assembling rectangular ductwork flanges. Supplied in zinc-plated mild steel for corrosion resistance. Available in various lengths to suit different flange thicknesses and gasket arrangements.
Self-drilling, self-tapping screws that pierce and thread into galvanised steel duct walls without the need for a pilot hole. The most common fixing for securing spiral duct joints, attaching brackets, and fixing accessories. We stock 4.2×13 mm (No.8 × ½″) hex-head tek screws in bulk packs — the industry-standard size for ductwork.
Aluminium or steel rivets for permanent fastening where a screw head would protrude into the airstream or where a flush exterior finish is needed. Applied with a standard rivet gun from one side of the joint. Common sizes are 4.0 mm and 4.8 mm diameter.
Flat washers, spring washers, and penny washers in zinc-plated steel. Used under bolt heads and nuts to distribute load, prevent loosening from vibration, and protect the galvanised duct surface from damage during tightening.
We sell fasteners in practical quantities for trade users — boxes of 100, 200, 500, and 1000. Ordering in bulk alongside your ductwork and fittings saves time and money compared to buying small packs from a general hardware supplier.
All our standard fasteners are zinc-plated to match the galvanised duct they are securing. For stainless steel ductwork installations or marine/corrosive environments, we can supply A2 (304) or A4 (316) stainless steel fasteners to prevent bimetallic corrosion at the fixing point.
Order your fasteners alongside your ducting and fittings for a complete delivery in one shipment. Alpha Air has been supplying the UK ventilation trade — we understand what installers need and stock it in the right quantities. Free delivery on orders over £400. Call 0116 246 0031.
Use 4.2x13mm (No.8 x 1/2 inch) hex-head self-tapping tek screws. These are the industry standard for securing spiral duct joints. Place two or three screws evenly around each joint after applying sealant and before taping. We sell them in bulk packs of 100 or more.
Self-tapping screws are faster to install and can be removed if a joint needs to be dismantled. Pop rivets provide a flush finish and are better for joints that will never be taken apart. Most installers use screws for general ductwork and rivets for visible or internal airstream surfaces where screw heads would cause turbulence.
M6 or M8 hex-head bolts with flanged nuts are standard for rectangular duct flange connections. M8 is the more common size for commercial ductwork. Space bolts at approximately 150mm centres around the flange perimeter for an airtight seal over the gasket.
