Concrete Screws, Hex Head, 316 Stainless Steel, 1/4” Diameter – Available Lengths

Available Lengths

Every screw on this page is Simpson Strong-Tie Titen Turbo® in 316 stainless, 1/4" diameter, hex washer head, driven with a 5/16" socket. Only the length changes. Check the individual product page for the carbide bit size.

Key Features

• 316 stainless steel — the marine grade, for coastal, splash-zone and chloride-heavy exposure
• Hex washer head with a 5/16" drive on every length
• Code listed under Florida Product Approval FL2355
• Anchors into concrete, brick, grout-filled CMU and hollow block
• One-piece screw anchor — no shield, plug or expansion sleeve required
• Removable and reinstallable

Hex Head or Trim Head?

Use the hex washer head where the head can bear on the surface and you want the extra torque a socket gives you — brackets, strapping, ledgers, sill plates. Use the trim head where the fastener needs to sit nearly flush, or where the fixture hole is too small for a washer face. Same screw, same base materials, same hole preparation.

Choosing a Length

Subtract your fixture thickness from the screw length to find how much thread reaches into the base material. That embedment carries the load, so when you are between two lengths, size up.

Installation

1. Drill with a 3/16" carbide-tipped bit, going deeper than the screw will embed so dust has somewhere to go.
2. Blow the hole clean with compressed air. Dust left in the hole is the most common cause of a screw that will not seat or that spins out.
3. Drive with a 5/16" socket at low speed until the washer face seats against the fixture. Do not overtighten — stripping the threads in the base material ruins the hold.

Frequently Asked Questions

Why 316 stainless instead of 410?

316 contains molybdenum, which is what gives it resistance to chlorides — salt spray, coastal air, pool chemistry, de-icing salt. 410 stainless is chosen for hardness rather than corrosion resistance and is the more economical option for interior and ordinary exterior work. For coastal exposure, or anywhere you cannot easily get back to the fastener, specify 316.

Do I need a washer under the head?

No. The hex washer head has an integral washer face that bears on the fixture, which is what distinguishes it from a plain hex head.

Can I reuse these screws?

The screw can be backed out and reinstalled, but each reinstallation into the same hole reduces holding power as the cut threads in the concrete wear. For a full-strength connection, drill a fresh hole.

Are these the same as stainless Tapcon® screws?

Same category of fastener. Tapcon® is ITW Buildex's trademark and has become shorthand for concrete screws generally. These are Simpson Strong-Tie Titen Turbo® in 316 stainless. Hole preparation is the same; confirm the bit size for the specific part.