--- product_id: 186331471 title: "CONFAST LDC383 3/8\" x 3\" Zinc Plated Large Diameter Concrete Screw for Anchoring to Masonry, Brick or Block (25 per Box)" brand: "confast" price: "€ 94.76" currency: EUR in_stock: true reviews_count: 13 category: "Confast" url: https://www.desertcart.gr/products/186331471-confast-ldc383-3-8-x-3-zinc-plated-large-diameter store_origin: GR region: Greece --- # 3/8" diameter precision fit Self-tapping low torque threads Serrated hex washer head for anti-backout CONFAST LDC383 3/8" x 3" Zinc Plated Large Diameter Concrete Screw for Anchoring to Masonry, Brick or Block (25 per Box) **Brand:** confast **Price:** € 94.76 **Availability:** ✅ In Stock ## Summary > 🔧 Anchor your projects with confidence—because every detail counts. ## Quick Answers - **What is this?** CONFAST LDC383 3/8" x 3" Zinc Plated Large Diameter Concrete Screw for Anchoring to Masonry, Brick or Block (25 per Box) by confast - **How much does it cost?** € 94.76 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.gr](https://www.desertcart.gr/products/186331471-confast-ldc383-3-8-x-3-zinc-plated-large-diameter) ## Best For - confast enthusiasts ## Why This Product - Trusted confast brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Ready to Use:** Single-piece design means zero assembly—just drill and drive. - • **Rock-Solid Hold:** Serrated hex washer head locks in place, preventing any back-out. - • **Effortless Installation:** Low torque threads cut their own path—no extra muscle needed. - • **Engineered for Concrete:** Zinc-plated carbon steel anchors masonry, brick, or block with unmatched durability. - • **Universal Compatibility:** Fits standard 3/8" drill bits and 9/16" nut drivers for seamless workflow. ## Overview The LDC383 is a 3/8" x 3" zinc-plated carbon steel concrete screw designed for masonry, brick, and block anchoring. Featuring self-tapping low torque threads and a serrated hex washer head, it ensures easy installation and secure fastening without back-out. Compatible with standard drill bits and nut drivers, this 25-piece set is engineered for dry environments and professional-grade durability. ## Description ApplicationsThe anchor is made from Carbon Steel, and is Zinc Plated. This anchor is designed for use in Concrete.EnvironmentThe anchor is designed for use in a Dry environment.Head Style The anchor is a Hex Washer Serrated head and is designed to allow the head to sit on top of the surface of the item being attached.Hole Diameter/Bit DiameterThe anchor requires a 3/8" hole to be drilled in the base material (Concrete). The hole should be drilled with carbide tipped bit using a hammer drill.Driver RequiredA 9/16" nut driver is required for driving the anchor into the base material.Diameter of Anchor The diameter of the anchor is 3/8".Length Anchor The length of the anchor is 3"Minimum EmbedmentThe minimum anchor embedment into the concrete is 1-1/2". Therefore, the anchor must be installed so that a minimum of 1-1/2" of the anchor is embedded into the concrete.Maximum Fixture ThicknessThe maximum fixture thickness or the maximum thickness of the material being fastened for a anchor is 1-1/2". This will ensure that the minimum embedment of 1-1/2" will be met.Fixture Hole DiameterThe hole in the fixture or material being fastened must be larger than the designated diameter of the anchor. The 3/8" diameter anchor requires the hole in the fixture to be 7/16".Spacing between AnchorsEach anchor must be spaced a minimum distance of 6" from each other when measured center to center.Edge DistanceIt is very important not to install the anchor any closer than 3" from an unsupported edge of the concrete. Review: Works great as long as you properly drill/prep - Used 16 of these to anchor our 12x16 Yardestry gazebo to our stamped concrete patio. Didn't have an issue with any of them. Good quality screws when used as designed. As they are NOT rated for outside/wet/damp environments, I will be painting them the same color as the brackets they anchor. If you intend to use ourdoors and don't want to paint them, look into stainless steel instead. A few tips for successful installation: - You MUST drill deeper than the length of the anchor. This seems like common sense but if you're even drilling to the exact length, you will likely reach a hard stop a few millimeters before its tight. Put a piece of duck or painters tape on the bit to show where to stop. - Blow out the drill hole. This is an absolute must do or you won't be able to screw it in very far. All that dust will compact and make it impossible to advance very far. Can of compressed air or even better an air compressor with a blow tool worked great for me. A can wouldn't have been enough for 16 holes. - Use an impact wrench but *CAREFULLY*. This is great for 2 reasons, #1 being you don't get carpal tunnel syndrome after manually screwing over a dozen if these in by hand and more importantly #2 it allows you to get on top of it and put you body weight into it. This helps significantly with getting the threads started and grabbing almost instantly. But be warned that this isn't like using it on metal-to-metal threads, as depending on the concretes make/age you could very quickly strip the hole with too much TQ used too quickly. Slow the impact as you near flush and stop once you get to 1 or 2 impact cycles that slowly turn the screw. - Use the right size drill bit. Seems obvious but just make sure your drilling with the SAME SIZE masonry bit as the screw is. If its even 1 size smaller you won't be able to get it to grab/advance. - Hammer drill. You might be able to pull it off with a regular drill but the hammer drill makes quick work of this and it's what it's designed to do. Your bit will wear faster as it will take longer and warm up/wear down faster because so. If you follow these basic tip, you'll have no issues with these screws. Good product and I prefer them over wedge anchors as it spreads the tension of the achor throughout the whole length of the screw and not just at the end. Review: Seems to be high quality item - Works great ## Features - WILL CUT ITS OWN THREAD INTO CONCRETE - When inserted in to properly drilled hole - LOW TORQUE THREADS - easy installation - SERRATED HEX WASHER HEAD - Prevents back-out - SINGLE PIECE DESIGN - No assembly required; ready to install - USE A STANDARD BIT - bit size is the same as the anchor diameter ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B084NGFXWS | | Best Sellers Rank | #26,975 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #34 in Concrete Screws | | Brand | CONFAST | | Color | Blue | | Compatible Groove Diameter | 0.38 inches | | Customer Reviews | 4.6 out of 5 stars 397 Reviews | | Drive System | External Hex | | Exterior Finish | Silver Ruspert | | Fastener Size | 3/8" x 3" | | Fastener Type | Concrete Screw | | Finish Types | Zinc Plated | | Head Style | Hex | | Head Type | Hex | | Item Diameter | 0.38 inches | | Item Dimensions | 3.5 x 3 x 3 inches | | Item Weight | 16 ounces | | Item dimensions L x W x H | 3.5 x 3 x 3 inches | | Manufacturer | CONFAST | | Material | Case Hardened Carbon Steel, Zinc Plated | | Material Type | Case Hardened Carbon Steel, Zinc Plated | | Metal Type | Stainless Steel | | Number Of Items | 1 | | Number of Pieces | 30 | | Outside Diameter | 0.38 inches | | Part Number | LDC383 | | Point Style | Hex Washer Serrated | | Screw Head Style | Hex | | Screw Point Style | Hex Washer Serrated | | Set Name | 25-Piece Set | | Set Screw Thread Type | Unified National Coarse (UNC) | | Size Name | 3" | | Thread Class | 3B | | Thread Coverage | Partially Threaded | | Thread Size | Self-tapping (Unc) | | Thread Style | Right Hand coarse, Partially Threaded | | Thread Type | Self-tapping (Unc) | | UPC | 820274006009 | | Unit Count | 30 Count | ## Product Details - **Exterior Finish:** Zinc,Steel - **Head Style:** Hex - **Material:** Carbon Steel - **Point Style:** Hex Washer Serrated - **Thread Size:** Self-tapping (Unc) ## Images ![CONFAST LDC383 3/8" x 3" Zinc Plated Large Diameter Concrete Screw for Anchoring to Masonry, Brick or Block (25 per Box) - Image 1](https://m.media-amazon.com/images/I/514uqznHqGL.jpg) ![CONFAST LDC383 3/8" x 3" Zinc Plated Large Diameter Concrete Screw for Anchoring to Masonry, Brick or Block (25 per Box) - Image 2](https://m.media-amazon.com/images/I/41VEz4AFwgL.jpg) ## Available Options This product comes in different **Size** options. ## Questions & Answers **Q: how many are in the package?** A: 25 per box, clearly stated in the heading! **Q: They say dry enviornment? Can these be used to secure a gazebo to a concrete pad?** A: I would say yes because it's not constantly wet. If the concrete is wet most of the time it can get flaky and not hold tight. **Q: Can this be used to attach an a/c mini-split wall mount brackets to stucco?** A: These are perfect for any cement or stucco surface. **Q: what size bosch concrete SDS drill bit is needed to use with these concrete screws?** A: 3/8 inch drill size. The bolt shaft is a hair under 3/8 inch an the thread diameter is about 7/16ths You will need a 3/8 inch ratchet wrench to torque these in. I used a power driver and snapped the adapter bit. The holding power is amazing. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Works great as long as you properly drill/prep *by S***E on June 11, 2023* Used 16 of these to anchor our 12x16 Yardestry gazebo to our stamped concrete patio. Didn't have an issue with any of them. Good quality screws when used as designed. As they are NOT rated for outside/wet/damp environments, I will be painting them the same color as the brackets they anchor. If you intend to use ourdoors and don't want to paint them, look into stainless steel instead. A few tips for successful installation: - You MUST drill deeper than the length of the anchor. This seems like common sense but if you're even drilling to the exact length, you will likely reach a hard stop a few millimeters before its tight. Put a piece of duck or painters tape on the bit to show where to stop. - Blow out the drill hole. This is an absolute must do or you won't be able to screw it in very far. All that dust will compact and make it impossible to advance very far. Can of compressed air or even better an air compressor with a blow tool worked great for me. A can wouldn't have been enough for 16 holes. - Use an impact wrench but *CAREFULLY*. This is great for 2 reasons, #1 being you don't get carpal tunnel syndrome after manually screwing over a dozen if these in by hand and more importantly #2 it allows you to get on top of it and put you body weight into it. This helps significantly with getting the threads started and grabbing almost instantly. But be warned that this isn't like using it on metal-to-metal threads, as depending on the concretes make/age you could very quickly strip the hole with too much TQ used too quickly. Slow the impact as you near flush and stop once you get to 1 or 2 impact cycles that slowly turn the screw. - Use the right size drill bit. Seems obvious but just make sure your drilling with the SAME SIZE masonry bit as the screw is. If its even 1 size smaller you won't be able to get it to grab/advance. - Hammer drill. You might be able to pull it off with a regular drill but the hammer drill makes quick work of this and it's what it's designed to do. Your bit will wear faster as it will take longer and warm up/wear down faster because so. If you follow these basic tip, you'll have no issues with these screws. Good product and I prefer them over wedge anchors as it spreads the tension of the achor throughout the whole length of the screw and not just at the end. ### ⭐⭐⭐⭐⭐ Seems to be high quality item *by C***. on May 31, 2026* Works great ### ⭐⭐⭐⭐ Would buy again *by D***T on July 26, 2025* Seams they work really well added epoxy to make sure they stayed ## Frequently Bought Together - CONFAST LDC383 3/8" x 3" Zinc Plated Large Diameter Concrete Screw for Anchoring to Masonry, Brick or Block (25 per Box) - BOSCH HC2061 3/8 in. x 4 in. x 6 in. Bulldog SDS-Plus Rotary Hammer Bit - Wensilon 1/4" x 3" Zinc Plated Large Diameter Concrete Screw for Anchoring to Masonry, Brick or Block (30 pcs) --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.gr/products/186331471-confast-ldc383-3-8-x-3-zinc-plated-large-diameter](https://www.desertcart.gr/products/186331471-confast-ldc383-3-8-x-3-zinc-plated-large-diameter) --- *Product available on Desertcart Greece* *Store origin: GR* *Last updated: 2026-10-08*