Fasteners and fittings are a small slice of what a heavy-equipment builder spends, but they cause an outsized share of the headaches. Run short of them and expensive assembly work sits idle. What keeps supply steady is quality you can trace, enough buffer stock and a replenishment routine to avoid running dry, and consolidating the long tail of small parts so procurement is not chasing dozens of tiny suppliers. Our write-up on OEM supply chain strategy digs into how that works, in our guide to OEM supply chain strategy.