FastenMaster Deck Screws & Hidden Fasteners

FastenMaster Cortex for Decks

FastenMaster is an American manufacturer offering innovative screw and fastener products. The most popular FastenMaster products lines include Cortex for Deck and Cortex for Trim. The FastenMaster Lok line of structural wood screws including FlatLok, HeadLok, LedgerLok, ThruLok and TimberLok are known by contractors for their strength and reliability. Build with confidence and get the job done right using FastenMaster products.


FastenMaster Cortex Hidden Fastening System for decks and trim is perfect for hiding deck screws in composite, pvc and capstock decking or trim. Choose from Cortex for Trex, Collated Cortex for Azek Trim, Cortex for TimberTech Decking, Cortex for Fiberon, and more.

LOK Line

The FastenMaster Lok line consists of 6 types of multi-purpose fasteners. FlatLok is used to attach multi-ply LVL and girder trusses. HeadLok is for cabinet, stair stringer, and deck framing installations. If fastening a deck ledger board to the rim joist of a house, then use LedgerLok. ThruLok acts as a through-bolt replacement for multi-ply beams, deck posts, carrying beams and more. Use TimberLok to attach rafters or trusses to the top plate, landscape timbers, fences, decks, headers or stair stringers.

Deck Screws

Quality hidden screws wood are essential for a clean deck installation. Select TrapEase 3 for color matched composite decking or GuardDog for pressure treated decking.

Specialty Products

FastenMaster has screws for every application. Use 7" GutterScrews to replace old spikes and the OlyLog Screws or LogHog Screws for your log home. There is also a Fastenmaster LTS lateral load resistance system for transferring the load of an attached deck. Make installations quicker and easier using FastenMaster tools like FrameFAST or PAMFast. FrameFAST attaches trusses and rafters to top plates, while PAMFast assists in a variety of installations including subfloor, decking and drywall.

View by Application

Not sure which FastenMaster screws are right for your project? No worries! Shop FastenMaster by application to select just the right product for the job.