T-STAR plus Flat Head HCR-X™, Partial Thread - Exterior Screws

A powerful galvanized exterior deck screw with proprietary HCR-X coating, is the fastener of choice for contractors working with treated lumber. The T-STAR plus Flat Head HCR-X, Partial Thread screw is ideal for overhead work and is available for both interior and exterior use. Choose the best screws for treated lumber and decking buy T-STAR plus Flat Head, Partial Thread fasteners in bulk from wholesalers, dealers, and specialty distributers or in project-appropriate package sizes at retail hardware and home improvement stores.

#14 x 1", 1-1/4", 1-1/2" and 2" lengths utilize a standard (full) thread design


SPAX® T-STAR plus Flat Head fasteners with HCR-X™ coating are designed for use in multiple material connections often found outside residential domains. These “work horse” construction fasteners are designed to countersink in treated lumber for a clean-flush finish and provides a quick and easy installation. In addition, they provide long-lasting, “contractor proven” secure connections.

Material & Coating

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 for cedar and redwood attachment applications. 

Base Part No.: 319167() and 419167()

SPAX® Patented MULTIHead Screw

The T-STAR plus Flat Head screw features ribs on the underside of the head that facilitate a clean, flush, or countersunk finish in wood and acts as a break against metal hardware to prevent stripping out.

  • Heat treated to Grade-5 durability
  • Patented thread serrations reduce driving torque to prolong power tool battery life
  • Unique 4CUT™ Point prevents splitting and requires no pre-drilling in wood
  • Superior bit fit to eliminate camming out

Whether you’re working with wood, concrete, masonry, sheet metal, plastic, or treated lumber, use SPAX Multi-Purpose Construction Screws on multiple materials.

Request a sample pack of SPAX Multi-Purpose Construction Screws today and build strong connections on the job site.


• 2-by framing connections - treated lumber

• Deck board finishing installation

• Deck railing 2x2 baulster

• Stair treads - treated lumber deck

• Exterior fencing

• Shed construction

• Outdoor furniture

For CAD documents, please see Technical Documents.

SizeDrive/Bit SizeThreadAvailable Pkg. Options
Retail PaxLarge Retail Pax1 lb. Box3 lb. Box5 lb. BoxIndividualProject PaxContractor PaxBulk Pail
#8 x 1-1/4"T-20 T-Star PlusPartial2301150
#8 x 1-1/2"T-20 T-Star PlusPartial25195550975
#8 x 2"T-20 T-Star PlusPartial154465770
#8 x 2-1/2"T-20 T-Star PlusPartial1243751500
#9 x 2-1/2"T-20 T-Star PlusPartial1093101500
#9 x 3-1/4"T-20 T-Star PlusPartial832451500
#10 x 1-1/2"T-20 T-Star PlusPartial125625
#10 x 2"T-20 T-Star PlusPartial99277495
#10 x 2-1/2"T-20 T-Star PlusPartial812354051500
#10 x 3"T-20 T-Star PlusPartial16672003351500
#10 x 3-1/2"T-20 T-Star PlusPartial591500
#14 x 1"T-30 T-Star PlusStandard115
#14 x 1-1/4"T-30 T-Star PlusStandard97
#14 x 1-1/2"T-30 T-Star PlusStandard90
#14 x 2"T-30 T-Star PlusStandard65
#14 x 2-1/2"T-30 T-Star PlusPartial551000
#14 x 3"T-30 T-Star PlusPartial101000
#14 x 3-1/2"T-30 T-Star PlusPartial101000
#14 x 4"T-30 T-Star PlusPartial81000
#14 x 4-3/4"T-30 T-Star PlusPartial8750