Yes, though scaffolding is treated more cautiously than machinery. Tube, fitting, system scaffold and boards have real value, but they are not serial-numbered in the way a machine is, they can be spread across many sites and they are easy to lose or have stolen. That makes fewer lenders comfortable, not none.
In practice, funders look hardest at the business rather than the stock. Trading history, filed accounts, the quality of your contracts and your payment record tend to carry more weight than the equipment schedule. Established scaffolding contractors with a steady order book generally get further than start-ups.
System scaffold from a recognised manufacturer, bought new with proper invoices, is usually easier to fund than mixed second-hand tube and fitting. Scaffold towers, loading bays and associated vehicles or trailers may be fundable alongside, and sometimes a package including a vehicle is a more attractive proposition to a lender than stock alone.
Be realistic about the risks. Because the security is weak, terms may be shorter and the lender may want a personal guarantee, which puts your own assets at risk if the business cannot pay. Scaffolding also ties up cash while stock sits on long-running jobs, so match the repayment term to how quickly the stock earns. Nothing is guaranteed until a lender says yes.