T-STAR plus Wafer Head HCR-X™, Partial Thread – Multi-Material Screw

Base Part #: 428167()

A multi-material wafer head screw with T-STAR plus Drive qualities offers a reliable installation of fixtures and brackets that require greater hold-down force. Buy T-STAR plus Wafer Head HCR-X™, Partial Thread multi-material screws in bulk from wholesalers, dealers, and specialty distributers or in project-appropriate package sizes at retail hardware and home improvement stores.


SPAX® T-STAR plus Wafer Head fasteners with HCR-X™ coating are designed for use in multiple material connections often found outside residential dwellings. These fasteners are designed with a low profile large diameter wafer head for applications requiring additional surface area under the head for superior pull-down force. Ideal for attaching rail, fencing and out building hardware where a flush or countersunk installation is not possible or desired. 

Materials & Coatings

Cold-rolled “carbon steel” wire, heat treated to grade 5 durability and plated with a HCR-X™ finish to prevent red rust. “HCR-X™” is tested and recognized for use in ground contact pressure treated lumber for exterior, freshwater general construction applications (e.g. AWPA UC1- UC4A, UCFA). SPAX® recommends stainless steel fasteners for applications with cedar and redwoods. 

SPAX® T-STAR Technology & Wafer Head

  • IRC / IBC Code Compliant DrJ TER No. 2010-02 Construction Screw Properties
  • Low-profile wafer head design provides a larger surface area for an aesthetically clean look
  • Heat treated to Grade-5 durability and strength
  • Reduce driving torque and extend power tool battery life with SPAX® patented thread serrations
  • Prevents materials from splitting and eliminate the need to pre-drill wood with the Unique 4CUT™ Point

SPAX Multi-purpose Construction Fasteners, like the T-STAR plus Wafer Head screw, are a versatile fastening solution for interior and exterior applications in a wide range of materials including wood, concrete, masonry, sheet metal, plastic and treated lumber. Our proprietary HCR-X™ Coating is approved for use in treated lumber and freshwater environments.

Note: SPAX recommends stainless steel fasteners for redwood and cedar connections.

Request a sample pack of SPAX Multi-Purpose Construction Screws today.


• Treated lumber rail and gate hardware attachment

• Other exterior applications where substrate must be tightly connected to treated lumber

• Outdoor furniture

• Outdoor play structures

• Window installation

For CAD documents, please see Technical Documents.

SizeDrive/Bit SizeThreadAvailable Pkg. Options
Retail PaxLarge Retail Pax1 lb. Box3 lb. Box5 lb. BoxIndividualProject PaxContractor PaxMini PailBulk Pail
#8 x 1-1/4"T-20 T-Star PlusPartial751952500
#8 x 1-1/2"T-20 T-Star PlusPartial401654952500
#8 x 2"T-20 T-Star PlusPartial1401500
#8 x 2-1/2"T-20 T-Star PlusPartial1201500
#10 x 2-1/2"T-20 T-Star PlusPartial771200
#10 x 3"T-20 T-Star PlusPartial631851000