Patriot Bolt and Fastener is your trusted source for Filter Specialists, Inc. (FSI) replacement parts for discontinued FSI products in the energy industry.
As an approved and authorized FSI replacement part manufacturer, we can provide various FSI replacement parts, ensuring you keep your existing equipment operational and maintain optimal filtration performance.

FSI Replacement Parts Supplier
As an approved FSI manufacturer, we work with many distributors to fulfill their customer’s demands. If you want a trusted partner reach out to us.
Sample of products we manufacture:
- Metal Replacement Baskets: 304 stainless steel and 316 stainless steel
- Specialty O-Rings: Available in Buna, EPDM, VITON®, Teflon® encapsulated Viton, Buna White
- Gaskets: FSI gaskets in Buna, EPDM, and Viton®
- Spare Hardware Kits: Eye Bolt (Rod End), Eye Nut, Clevis Pin
- Mesh Filter Socks (Mesh Filter Bags)
- FSI X-100 replacement gasket in Buna or Viton®
- FSI X-100 replacement baskets




Don’t hesitate to contact us with questions regarding your specific FSI replacement part.
We are here to help you navigate the transition and provide the necessary solutions to keep your operations running smoothly.