Formwork Tie Rod / Speed Bar (Стяжной винт) – Dywidag 15/17mm & Coil Thread

Product Overview: The Backbone of Concrete Formwork

Our Speed Bar (professionally known as Formwork Tie Rod, Coil Rod, or Dywidag Bar) is the critical structural component used in modern concrete construction. Unlike standard fasteners, this rod features a robust, coarse thread designed to hold concrete formwork panels firmly in place against the massive hydrostatic pressure of pouring wet concrete.

Whether you are constructing high-rise building foundations, bridge pylons, or tunnel walls, our Tie Rod system ensures the formwork remains stable, preventing “blowouts” and ensuring accurate wall thickness. The term “Speed Bar” refers to its ability to be rapidly assembled and disassembled using fast-running Wing Nuts, significantly reducing labor time on the job site.

Russian Name: Стяжной винт для опалубки / Шпилька стяжная

System Compatibility: Fully compatible with Doka, Peri, and standard Dywidag formwork systems.

Key Engineering Features

1. Self-Cleaning “Coil” Thread

One of the biggest challenges on a construction site is concrete splatter. Standard metric threads get clogged easily, making nuts impossible to turn. Our Speed Bar features a specialized Formwork coarse thread (often called ACME or Dywidag thread).

• Benefit: The wide pitch allows dried concrete, mud, and rust to fall off easily when the nut is spun, ensuring reusability.

• Durability: The thread is hot-rolled onto the steel bar, not cut. This maintains the continuous grain flow of the steel, resulting in a thread that is stronger and more resistant to shear forces.

2. High Tensile Strength (PSB Grades)

Safety is non-negotiable in formwork. We manufacture our rods using high-grade alloy steel to meet strict yield strength requirements.

• PSB 830: The standard grade for residential and commercial construction.

• PSB 930 / 1080: High-strength grades for heavy civil engineering projects like dams and nuclear power plants.

• Weldability: Our rods are designed to be weldable, allowing for versatile anchoring solutions on complex sites.

3. Cost-Effective Reusability

Unlike embedded anchors that are left in the concrete, our Formwork Tie Rods (when used with PVC sleeve tubes) can be removed after the concrete cures and reused dozens of times. This makes them a highly economical asset for construction rental companies and contractors.

Detailed Technical Specifications

We control every step of production in our Handan facility, from raw material wire drawing to final heat treatment.

Property	Specification Details
Product Name	Formwork Tie Rod, Speed Bar, Dywidag Bar, Coil Rod
Russian Name	Стяжной винт 15/17мм
Material Grade	Q235, 45# Steel, 40Cr, PSB830, PSB930
Standard Diameter	15mm / 17mm (The global industry standard)
Other Diameters	12mm, 20mm, 25mm, 32mm (Available on request)
Thread Type	Hot Rolled Dywidag Thread / Cold Rolled Coil Thread
Thread Pitch	10mm (Standard for 15/17mm rods)
Breaking Load	> 140 kN (approx. 14 Tons) for 15mm rod
Safe Working Load	Approx. 90 kN (Safety Factor 1.6:1)
Surface Finish	Black (Self-colour), Galvanized (Zinc Plated), Painted
Length	1.0m, 3.0m, 6.0m (Can be cut to any length)

Essential Accessories (The Complete System)

A Speed Bar never works alone. We supply the full ecosystem of formwork accessories to ensure you can offer a “One-Stop” solution to your clients:

• Wing Nuts (Anchor Nuts): Large butterfly-shaped nuts that can be tightened with a hammer.

• Waler Plates: Square or round washers that distribute the load onto the formwork beams.

• Water Stops: Cast iron connectors used in water-retaining structures (like water tanks) to prevent seepage along the tie rod.

• PVC Cones & Tubes: Plastic spacers that allow the rod to be removed easily.

Applications in Modern Construction

• Shear Walls: Holding double-sided formwork for residential apartment blocks.

• Columns & Pillars: Securing adjustable column formwork.

• Infrastructure: Heavy-duty anchoring for bridge abutments and tunnel linings.

• Precast Industry: Lifting and fixing precast concrete elements.

Manufacturing & Quality Control

At HDBolt, we understand that a failed tie rod can lead to catastrophic formwork collapse.

• Tensile Testing: Every batch of 50 tons is sampled and tested in our lab to verify it meets the minimum breaking load (e.g., 140kN).

• Dimensional Check: We use “Go / No-Go” gauges to ensure our thread pitch is perfectly compatible with genuine Dywidag or Peri nuts.

Get a Competitive Factory Quote

We export containers of Speed Bars and Wing Nuts to Russia (Moscow, St. Petersburg) and Europe every week. Our massive raw material stock allows us to offer the most competitive “per meter” or “per ton” pricing in the market.

Whether you are a formwork rental company or a building material distributor, please Contact Us today for our latest price list and shipping weight calculation.