How long can concrete screws be?
Sinsun offers long concrete screws up to 12" in 1/4" and 3/8" diameters. Longer lengths available by special order.
Long Concrete Screws
Heavy-Duty, High Holding Force
B2B Factory-Proven Quality
Fast Delivery, Bulk Supply
Sinsun Long Concrete Screws: Extended Length for Thick Materials
Sinsun long concrete screws in 6" to 12" lengths. 1/4" and 3/8" diameters. 425-1,200+ lbs pull-out capacity. Ideal for thick furring, multi-layer assemblies, and deep embedment requirements. Factory direct pricing. Request samples.
Get a Quick QouteSinsun Long Concrete Screws: Engineered for Thick Material Fixing
When regular screws don't reach deep enough, Sinsun line long concrete screws provide the extra reach you need. When regular screws don't reach deep enough, Sinsun's long concrete screws provide the extra reach you need. These screws come in lengths of 6 to 12 inches and diameters of 1/4 and 3/8 inches. They have a partial thread design, which means that the smooth upper shank can easily pass through thick wood, insulation, or multi-layer assemblies, while the lower aggressive threads cut directly into masonry, brick, or block. The pull-out strength of each screw is the same as our standard line: 425 pounds for 1/4" diameter and 1,200 pounds for 3/8" diameter. No epoxy, no through-bolting, and no access from the back is required. The only thing you need to do is make one hole and drive it in.
Sinsun has been manufacturing long screws since 2005, and they do everything in-house. Four separate heat treatment lines ensure the hardness the same along the entire 12-inch length. Japanese thread rollers can handle long blanks with 0.02 mm tolerances.
Specialized straightening tools guarantee that every screw drives straight. When securing multi-layer furnace assemblies, securing 6x6 timber curbs to bridge decks, anchoring heavy equipment through 4 inches of grout, or attaching heavy equipment, Sinsun long concrete screws make it easy to move from layout to load-holding connection.
What Are Long Screws for Concrete?
Long concrete screws are self-tapping masonry anchors that are longer than normal, usually between 6 and 12 inches—so they can penetrate through thick materials and still be properly embedded in the base of concrete.
Most Significant Features
Length:
6 to 12 inches in total
Partial Thread Design:
The threaded part is only where it needs to be, which is usually between 1-1/2" and 2-1/2".
Smooth Shank:
The top part is not threaded so it can pass through the fixture material without getting stuck.
Head Styles:
Flat countersunk and hex washer (Same as standard series).
Available Sizes:
1/4" and 3/8" (larger sizes can be made to order).
Why Length is Critical
Standard screws can't pass through thick materials and still be properly embedded.
Practical Example:
A 4" screw that runs through 2" of wood only has 2" left to embed, but you need at least 1" to do so, so it's possible but tight. A 4" screw won't work at all on 3" of wood.
Our Long Concrete Screws Product Range
We offer a full line of long concrete screws from Sinsun, ranging from 5 to 12 inches in length.These screws are designed for various heavy-duty industrial uses and load requirements. ETA standards, ASTM C1093, and ISO 9001:2015 certifications.They are made with high-quality materials that have been heat-treated to ensure quality and to perform well in critical industrial situations.
1. Blue Ruspert Coated Long Concrete Screws
The Sinsun Blue Ruspert coating on long concrete screws makes them the best choice for tough outdoor jobs due to their high resistance to rust. ASTM B117 states that the advanced Ruspert coating protects against salt spray for 720 hours. This makes these screws the most appropriate choice for coastal construction, pressure-treated lumber contact, and any place where moisture is always present. Our aggressive self-tapping thread geometry allows these screws cut cleanly into concrete up to C50 strength. They come in 1/4" and 3/8" diameters and are 6 to 12 inches long. The factory-applied blue coating is the same thickness, with no thin spots or bare threads.There are few things that hold things together better than Sinsun Blue Ruspert screws. It is designed for contractors fastening thick sleepers, dock timbers, or equipment bases that must resist corrosion for a long period of time.
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2. Stainless Steel Long Concrete Screws
If you need the highest corrosion resistance, Sinsun stainless steel long concrete screws are the way to go. They are made of marine-grade stainless steel A4 (316) and can withstand salt spray for more than 5,000 hours.This is the standard for places like chemical plants, food processing plants, and places directly on the coast. Each screw comes in 1/4" and 3/8" diameters and up to 12 inches long. They are thoroughly hardened to HRC 48-52 and have a tensile strength equal to grade 10.9. The aggressive thread design cuts cleanly through concrete, brick, and block, and the smooth shank cuts through thick fixture materials without any problem. The metal itself resists corrosion, so there is no coating that can chip or wear away.In any project near salt water, Sinsun 316 stainless long concrete screws are the best choice.
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3. Zinc Coated Long Concrete Screws
Sinsun zinc-coated long concrete screws work well for indoor as well as outdoor use and are good values. The shiny zinc coating protects against corrosion for 48 to 72 hours. This is enough for dry interiors, covered porches, and places that don't get much moisture. These screws are made of the same heat-treated carbon steel as our premium lines and have precision-rolled threads. They come in sizes 1/4" and 3/8" and lengths of 6 to 12 inches. Partially threaded shanks pass through thick wood, insulation, or multi-layered assemblies without getting stuck, while partially threaded shanks dig deep into concrete. Sinsun zinc-coated screws are suitable for holding things in place in a warehouse, mounting equipment, or for any other indoor use that requires a long screw. They are also very affordable.
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4. Hex Head Long Concrete Screws
Sinsun hex heads long concrete screws are made for jobs that need torque to install. The external hex drive works with a regular socket or nut driver to give you the most rotational force possible. This is without the risk of cam-out or stripping the drive. This is very critical when driving screws through thick materials and into dense concrete. The screws come in two sizes: 1/4" (5/16" hex) and 3/8" (5/16" hex) and can be up to 12 inches long. Each screw has a built-in washer face that evenly spreads the clamping force across the fixture surface. The hex head profile ensures that the driver stays engaged at any angle, which is why these screws are the excellent choice for production settings, work done above your head, and places where the screw head is still visible. You can get Sinsun hex head long concrete screws in Blue Ruspert, zinc, and stainless steel finishes to fit your corrosion resistance needs.
5. Flat Head Long Concrete Screws
Sinsun flat head long concrete screws let you mount things flush, which is important when the fasteners need to be level with the surface. The 90-degree countersunk head design lets the screw fit all the way into the fixture material, making a smooth, snag-free finish that works well for architectural woodwork, finished interiors, and putting up signs. Each screw has a deep #3 Phillips or T-30 head and is 1/4" in diameter and 6 to 12 inches long. Torx drive recess that keeps the connection even when driving at the shallow angle needed for flush mounting. The partial thread design ensures that the smooth upper shank can easily pass through the fixture while the threaded part goes deep into the concrete. Sinsun concrete screws are available in Blue Ruspert, zinc, or 304/316 stainless steel finishes. The long, flat head of the Sinsun concrete screws lets you reach farther without compromising their appearance.
| Parameter | Specification |
| Material Options | Carbon Steel (10B21), 316 Stainless Steel (A4 Marine Grade) |
| Hardness (Carbon Steel) | HRC 45-50 (case-hardened) |
| Hardness (Stainless Steel) | HRC 48-52 (through-hardened) |
| Tensile Strength (Carbon) | 8.8 grade (800 MPa minimum) |
| Tensile Strength (Stainless) | 10.9 grade (1,000 MPa minimum) |
| Coating Options | Blue Ruspert (720 hours salt spray), Hot-dip Zinc (480 hours salt spray), Stainless Steel (no coating required) |
| Thread Type | Reinforced aggressive self-tapping thread (metric or imperial options available) |
| Drive Types | Hex, Torx (T30 for 1/4", T40 for 3/8"), Phillips (#3 for 1/4") |
| Length Range | 5 inches to 12 inches |
| Diameter Range | 3/16", 1/4", 5/16", 3/8" |
| Embedment Depth (Minimum) | 2 inches (for optimal holding strength) |
| Embedment Depth (Maximum) | 8 inches (for optimal holding strength) |
| Working Temperature | -40°C to +80°C |
| Base Material Compatibility | Concrete (C20-C50), Solid Brick, Concrete Block (CMU), Masonry (minimum base thickness: 4 inches) |
| Pull-Out Force (5-inch length) | 900+ lbs (in C20/25 concrete, proper embedment) |
| Pull-Out Force (10-inch length) | 1,200+ lbs (in C20/25 concrete, proper embedment) |
| Series | Coating/Material | Diameter | Length Range | Head Style | Primary Applications |
| Blue Ruspert Coated | Blue Ruspert (720h salt spray) | 1/4", 3/8" | 6" to 12" | Hex / Flat | Exterior, pressure-treated lumber, coastal |
| Stainless Steel | A4 (316) Stainless Steel | 1/4", 3/8" | 6" to 12" | Hex / Flat | Marine, chemical, food processing |
| Zinc Coated | Clear Zinc (72h salt spray) | 1/4", 3/8" | 6" to 12" | Hex / Flat | Interior, dry applications |
| Hex Head | Blue / Zinc / Stainless | 1/4", 3/8" | 6" to 12" | Hex Washer | High-torque, production environments |
| Flat Head | Blue / Zinc / Stainless | 1/4" only | 6" to 12" | Flat Countersunk | Flush mounting, finished surfaces |
| Material Thickness | Recommended Screw | Embedment Achieved |
| 4" | 6" screw | 2" (1/4" dia) / 1-1/2" (3/8" dia) |
| 5" | 8" screw | 3" (1/4" dia) / 2-1/2" (3/8" dia) |
| 6" | 8" screw | 2" (1/4" dia) / 1-1/2" (3/8" dia) |
| 7" | 10" screw | 3" (1/4" dia) / 2-1/2" (3/8" dia) |
| 8" | 10" screw | 2" (1/4" dia) / 1-1/2" (3/8" dia) |
| 9" | 12" screw | 3" (1/4" dia) / 2-1/2" (3/8" dia) |
| 10" | 12" screw | 2" (1/4" dia) / 1-1/2" (3/8" dia) |
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Drill the Pilot Hole
Use a hammer drill with a carbide-tipped bit.
Bit must be long enough to reach full hole depth.
Bit diameter: 3/16" for 1/4" screws, 3/8" for 3/8" screws.
Drill through all material layers plus embedment depth + 1/4".
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Contact usClean the Hole
Critical for long holes—dust accumulates at the bottom. Compressed air is the only reliable method for deep holes. Blow until no dust emerges.
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4
Drive the Screw
Use a high-torque impact driver or electric wrench.
Drive at moderate speed—not full throttle.
The screw will spin freely through the material, then engage when threads reach concrete.
Stop when head contacts fixture snugly.
Q&A
Q&A
Are all long screws fully threaded?
No. Long concrete screws have partial threads—threaded only on the portion that engages the concrete. The upper shank is smooth to pass freely through the fixture material.
Q&A
What's the maximum material thickness I can fasten?
For 1/4" diameter: up to 11" with a 12" screw using 1" embedment. For 3/8" diameter: up to 10-1/2" with a 12" screw using 1-1/2" embedment.
Q&A
Do I need special tools for long screws?
You need a hammer drill with a bit long enough to reach the full hole depth—typically 2" longer than the screw. For driving, a high-torque impact driver or electric wrench is recommended.
Q&A
Can I use long screws overhead?
Yes, but installation is more difficult. Use a driver with good grip and consider having a helper hold the screw while starting.
Q&A
What drill bit do I use for long screws?
For 1/4" screws: 3/16" carbide bit. For 3/8" screws: 3/8" carbide bit. Bit must be long enough for full hole depth.
Q&A
How deep should I drill?
Drill to your desired embedment depth + 1/4" minimum. For a 12" screw with 2" embedment, drill 2-1/4" deep into the concrete (plus through your material).
Q&A
Can I remove long concrete screws?
Yes. They unscrew just like standard concrete screws. The threads remain intact unless damaged during first installation.
Q&A
Do long screws cost more than standard?
Yes, due to more material and more complex manufacturing. However, they eliminate the need for epoxy anchors or through-bolting in many applications.
Q&A
Can I get samples?
Yes. Contact our sales team for sample requests. We'll send up to 3 sizes for testing.
Q&A
What's your lead time for long screws?
Stock sizes (6", 8", 10", 12") ship within 15 days. Custom lengths require 30-45 days.
Q&A
Do you offer stainless steel in long lengths?
Yes—316 stainless available by special order. Longer lead time applies (45-60 days).
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