America's Leading Manufacturer of Brass and Bronze Fasteners

(800) 523-6733


Keystone Screw has been an ISO certified company since 2004.  The current level of certification is ISO 9001-2015.


Keystone Screw stands behind its products with confidence. With Keystone's stringent quality control program, you can rest assured knowing that you will receive only the finest finished fasteners available.


Keystone Screw's quality control program monitors every phase of the manufacturing process. From receipt of raw material, to final inspection, Keystone painstakingly makes sure each fastener is within specifications. Keystone routinely undergoes gauge calibration and certification to maintain a consistent level of quality. Most importantly, Keystone's quality control department is staffed with responsible personnel whose sole function is to assure that these fasteners will successfully perform in your specific application.


Keystone's Quality Control procedures are documented in manuals that are available for customer evaluation.


Feel free to download our current ISO certificate below.