Applications & FAQ

APPLICATIONS

SPAX® Multi-purpose Construction Screws

For flush or countersunk installation, use SPAX® Unidrive or T-STAR plus flat head construction screws. Where flush or countersunk installations are neither possible nor desired, SPAX® pan head construction screws provide superior draw down and holding performance.

• Fabricating wood shelving

• Replacing loose or stripped screws

• Installing cabinetry

• Sawhorses

• Installing window framing

• Outdoor furniture

• Installing plumbing supports

• Installing plywood or OSB

• Countertops

• Fixture to concrete

• Furring strips to concrete

• Thresholds to concrete

• Medium-duty hanger supports to concrete

• Brick molding 

• Drywall

• Composite trims

• Hinges

• Indoor furniture

• Outdoor lighting

• Pegboard

• Modular storage units

• Wooden bridges & wooden walkways

• Heavy wood timbers

• Shelf brackets

• Signs, clocks, pictures

• Subfloor sheathing

• Stair treads

• Recreational wood crafts

• Siding

• Wood fencing

 

SPAX® PowerLags®

• Deck ledger board attachment (DrJ TER No. 1711-01)

• Deck rim joist and girders

• Deck railing and balusters

• Multi-ply - LVL beams and girder truss assemblies (DrJ TER No. 1802-03)

• Retaining walls

• Exterior privacy fences

• Clothesline poles

• Sign posts

• Outdoor furniture

• Pergolas

• Gazebos

• Shelving

• Sheds

• Mailbox posts

• Mailboxes

• Landscaping timbers

• Spas

 

SPAX® T-STAR plus Wafer Head Screws

• Installation of fine cabinetry

 

SPAX® Rear Panel Screws

• Attachment of back panels to bookcases, storage units and cabinetry

 

SPAX® MDF/Hardwood Screws

• Assembly of medium density fiberboard (MDF) cabinetry and storage units

• Oak and other hardwoods to help guard against splitting

• Connecting cabinetry through the front style frames

• Attachment of lightweight, high-density polyurethane trim and moldings

 

FAQs

 

Why do you call your fasteners “multi-purpose?”

The SPAX® fastener has patented features that allow it to perform in a wide variety of applications and materials other than wood, including concrete, masonry, light gauge sheet metal (24ga.) and plastics.

 

What does Unidrive mean?

Unidrive is a Phillips/Square Drive combo system for the SPAX® fastener. The user has the option of using either a Phillips drive bit or a Square drive bit to install the SPAX® fastener.

 

Where are SPAX® fasteners available?

SPAX® fasteners are available at most local home improvement retailers, industrial supply houses and online specialty woodworking outlets in the U.S. We are currently working to build a nationwide network of lumberyard and building materials suppliers.

 

Your packaging says “no pre-drilling.” Does that include concrete?

No pre-drilling is referencing application with hardwoods — not concrete. Concrete applications require pre-drilling with a carbide bit before installing the SPAX® fastener. Required hole size is published on the back of our product packaging.

 

Are there any tips to using SPAX® fasteners in concrete?

Yes. Keep in mind these are primarily medium-duty fasteners, and each application is different. Always use the correct diameter fastener for the applications and carbide bit required. Embedment into the masonry should be ¾” min. to 1-1/4” max. Also, pre-drill the hole ¼” deeper than thread engagement for maximum performance of the fastener.

 

Can I use SPAX® fasteners in treated lumber?

Yes! Our 304 series stainless steel deck and construction screws, as well as our multi-purpose construction screws with HCR-X™ and powerLags® with high corrosion resistant (HCR®) coatings are compatible with ACQ lumber.

 

What exactly is HCR®?

HCR® (High Corrosion Resistant) is a dual barrier coating system designed to extend the longevity of the SPAX® fastener when installed in treated lumber applications. The first barrier is an electrically applied substrate with a proprietary organic topcoat offering 1000 hr. salt spray performance. NOTE: HCR® from SPAX® is typically green in color.

 

What is HCR-X™?

HCR-X™ is the latest proprietary coating system developed by SPAX® U.S. It offers improved corrosion resistance over SPAX® HCR® coating in that it has been tested for use in coastal building environments (Condition 4), in addition to being approved for use in treated lumber. It is the next best thing to 304 stainless steel for corrosion resistance — at an affordable price.

 

What are SPAX® screws made of?

Excluding our 304 series stainless steel line, all of the SPAX® fasteners are heat treated to Grade 5 durability carbon steel, from the small #6 diameter fasteners up to the ½” diameter PowerLags®.

 

What is the difference between blue zinc (silver) and yellow zinc?

The first difference is the color itself, which gives the user an option for aesthetics. The yellow zinc is a slightly higher grade of plating for corrosion protection vs. the blue zinc (also known as Brite zinc).

 

How many fasteners do I need?

We would like you to decide that by the practical life expectation you have for your specific wood project or concrete application.

 

Why can’t I use the PowerLags® in concrete?

The PowerLags® thread pitch and threads-per-inch design is different than our multi-purpose fasteners. PowerLags® are designed to be high-performance fasteners for wood-to-wood applications only.