1/4" x 2-3/4" Hex Head Aggre-Gator® 300 Series Stainless Bi-Metal Tapcon Concrete Screws Fasteners

Customer Reviews

:In stock

: EML335-050

: Fastener


: ELCO Construction Fasteners & Screws, ELCO Crete-Flex Stainless Steel Masonry Fasteners, Shop ELCO Aggre-Gator® 300 Series Stainless Steel Screws

Aggre-gator 300 Series Stainless Steel Anchors from Elco Construction Products feature bi-metal technology: a 300 (18-8) stainless steel head and shank fused to hardened steel tapping threads and gimlet point. The entire anchor is covered with Stalgard GB (Galvanic Barrier) coating. These features make Aggre-Gator anchors virtually immune to hydrogen-assisted stress corrosion cracking. Alternating, hi-low notched threads provides quick cutting and stability during installation and hold tight in block and poured concrete. You won't find a better, easier-to-install or more reliable 300 series stainless steel anchor for your toughest concrete and masonry applications. Miami-Dade County Product Control Approved-NOA No. 08-0813.06, High Velocity Hurricane Zone.
Aggre-gator® anchors provide unmatched corrosion resistance in demanding applications, such as those in coastal or wet areas.
1/4 x 2-3/4"
2-3/4 in
Drive System
5/16 in Hex
Carton Qty.
8 lbs
Head Size
Hex Washer Head
Screw Type
Box Qty.
1.4 lbs
Made in USA
1/4 in
Head Style
Hex Washer
300 (18-8) Stainless Steel Head and Shank with Fused and Hardened Steel Tapping Threads and Gimlet Point
Silver-Colored Stalgard® GB (Galvanic Barrier) Coating
Bi-Metal Technology
  • Head and shank made of 300 series (18-8) stainless steel alloy to provide unmatched corrosion resistance in your toughest applications
  • Fused and hardened steel tapping threads make installation easy and hold tight in block and poured concrete
  • Coated overall with silver-colored Stalgard® GB, a Galvanic Barrier to protect aluminum components from accelerated corrosion when in contact with 300 series stainless steel
Features and Benefits
  • Long service life - high in-place value over life of structure
  • High strength and ductility
  • Offers greater galvanic compatibility in dissimilar metal applications involving aluminum
  • Thread profile provides quick cutting and stability during installation
  • Installs with 3/16" masonry drill bits

Returns Policy

You may return most new, unopened items within 30 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).

You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).

If you need to return an item, simply login to your account, view the order using the 'Complete Orders' link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.


We can ship to virtually any address in the world. Note that there are restrictions on some products, and some products cannot be shipped to international destinations.

When you place an order, we will estimate shipping and delivery dates for you based on the availability of your items and the shipping options you choose. Depending on the shipping provider you choose, shipping date estimates may appear on the shipping quotes page.

Please also note that the shipping rates for many items we sell are weight-based. The weight of any such item can be found on its detail page. To reflect the policies of the shipping companies we use, all weights will be rounded up to the next full pound.