It is not explicit whether all suppliers are screened at the time of onboarding and there is no mention of number of new suppliers.

pg. 15

"With a local and global supplier base, continuous monitoring and local representation is a necessity to ensure protocols are triggered when risk may be evident, ensuring a safeguard against poor and/or impaired quality and regulatory violations that may otherwise impact our reputation in the marketplace. This is performed not only at the time of supplier vetting and onboarding, but for the life of the relationship with the supplier. This process promotes a supply chain that is supportive of Fastenal's Global Supplier Purchase Order Terms & Conditions and Supplier Code of Conduct. In the event of non-compliance or potential risk, we work with the supplier to correct the situation. If remediation efforts are not undertaken to ensure the supplier remains in compliance with Fastenal's standards and code of conduct, alternative sources for supply may be considered to ensure the integrity of our supply chain. "