DIN 1480-Type Galvanized Hook-and-Eye Turnbuckle
The hook-and-eye open-body turnbuckle is a mechanical tension-adjustment fitting used in guy-wire, steel wire-rope, fencing, pole-line and general static support assemblies. Rotating the central body draws the two threaded end fittings together or pushes them apart, allowing the connected assembly to be tightened, loosened or accurately adjusted.
This configuration has a closed eye at one end and an open hook at the other. The eye provides a captive connection point for a shackle, bolt, wire-rope thimble or compatible fitting. The hook allows faster attachment and removal where a permanently closed connection is not required.
The open-body construction makes the threaded engagement visible during adjustment and inspection. One terminal uses a right-hand thread and the other uses a left-hand thread, enabling both ends to move simultaneously when the body is rotated.
Important: The product shown is intended for in-line tensioning and static load applications. A standard hook-and-eye turnbuckle must not be advertised or used as certified lifting hardware unless the exact model has an assigned working load limit and supporting lifting-equipment certification.
Key Features
- Hook-and-eye terminal configuration
- Open body allows visual inspection of thread engagement
- Right-hand and left-hand threads provide simultaneous adjustment
- Suitable for tension adjustment and removal of cable slack
- Available in multiple metric thread sizes
- Carbon-steel construction for general mechanical applications
- Zinc-plated or hot-dip galvanized surface options
- Alternative eye-and-eye, hook-and-hook and jaw-end versions available
- Custom dimensions, coating, packaging and marking available
Typical Technical Specifications
| Product Type | Open-Body Hook-and-Eye Turnbuckle |
|---|---|
| Reference Design | DIN 1480-Type |
| End Configuration | One open hook and one closed eye |
| Thread Arrangement | One right-hand thread and one left-hand thread |
| Representative Sizes | M6, M8, M10, M12, M16, M20, M24, M30 and M36 |
| Body Material | Carbon steel |
| Terminal Material | Carbon steel |
| Body Form | Open forged or formed steel body according to the approved drawing |
| Surface Finish | Zinc plated or hot-dip galvanized |
| Application | Guy wire, steel wire rope, support cable, fencing and static tensioning |
| Load Direction | Axial in-line tension only |
| Customization | Thread size, body length, terminal type, material, coating, marking and packaging |
Representative Size Data
| Thread Size | Standard Coarse Pitch | Representative Body Length | End Configuration |
|---|---|---|---|
| M6 | 1.00 mm | 110 mm | Hook and Eye |
| M8 | 1.25 mm | 110 mm | Hook and Eye |
| M10 | 1.50 mm | 125 mm | Hook and Eye |
| M12 | 1.75 mm | 125 mm | Hook and Eye |
| M16 | 2.00 mm | 170 mm | Hook and Eye |
| M20 | 2.50 mm | 200 mm | Hook and Eye |
| M24 | 3.00 mm | 255 mm | Hook and Eye |
| M30 | 3.50 mm | 255 mm | Hook and Eye |
| M36 | 4.00 mm | 295 mm | Hook and Eye |
The table contains representative DIN 1480-type dimensions. Overall closed length, maximum extended length, adjustment range, hook opening, eye diameter, weight and load capacity must be confirmed from the approved product drawing and test data.
How the Turnbuckle Works
The two end fittings have opposite thread directions. When the open central body is rotated in one direction, both threaded terminals move inward and increase tension. Rotating the body in the opposite direction moves the terminals outward and reduces tension.
Sufficient thread engagement must remain inside both ends of the body. The threaded rods must not be extended beyond the limit specified by the manufacturer or project drawing.
Hook-and-Eye Configuration
Closed Eye End
The closed eye provides a captive connection point and may be assembled with a shackle, wire-rope thimble, bolt or other dimensionally compatible hardware. The connecting component must fit without producing harmful side loading.
Open Hook End
The open hook provides a quick, removable connection. Because it is not fully closed, it may disengage if the assembly becomes slack, twists or is subjected to unintended movement. The hook-and-eye version is therefore best suited to controlled static tensioning applications.
For critical connections where accidental disengagement is unacceptable, an eye-and-eye or jaw-end turnbuckle may be more appropriate.
Materials and Manufacturing
The body and threaded terminals are commonly manufactured from carbon steel. Depending on the selected product grade, the open body may be forged or formed, while the threaded terminals may be forged, formed or machined.
Steel grade, manufacturing method, thread tolerance and mechanical properties must be confirmed from the manufacturer’s drawing and material certificate. The photograph alone cannot confirm whether the body is forged or formed.
Surface Treatment
Zinc-Plated Finish
Zinc plating produces a relatively bright and smooth metallic surface. It is suitable for general indoor applications and mildly corrosive environments. The zinc-plating thickness and supplementary treatment should be specified before ordering.
Hot-Dip Galvanized Finish
Hot-dip galvanizing provides a thicker protective zinc coating and is generally preferred for outdoor guy-wire, utility-pole, fencing and infrastructure applications. Thread fit must be considered when components are galvanized after manufacture.
The supplied photograph appears closer to a smooth zinc-plated finish, but the actual coating process and thickness cannot be determined from appearance alone.
Applications
- Utility-pole guy-wire tension adjustment
- Steel wire-rope and support-cable assemblies
- Telecommunications pole guying systems
- Fencing and agricultural support wires
- Canopies, signs and light structural bracing
- General industrial static tensioning
- Temporary adjustment and alignment assemblies
Selection Guidelines
- Determine the required thread size and adjustment range.
- Confirm the expected in-line tensile load.
- Select the required hook opening and eye inside diameter.
- Check compatibility with the wire rope, shackle, bolt or attachment point.
- Select zinc plating or hot-dip galvanizing according to the environment.
- Confirm the required material grade and mechanical test documentation.
- Use a closed-eye or jaw configuration when a more secure connection is required.
Do not select a turnbuckle solely by its thread diameter. Body construction, terminal dimensions, material grade, thread engagement and tested mechanical capacity must also be considered.
Installation Guidance
- Inspect the body, threads, hook and eye for cracks, deformation or damaged coating.
- Confirm that the two threaded terminals have opposite thread directions.
- Start both threaded ends evenly inside the open body.
- Keep sufficient thread engagement on both sides during adjustment.
- Align the turnbuckle with the direction of tensile loading.
- Do not apply bending, side loading, twisting or shock loading.
- Rotate the body until the required tension is reached.
- Secure the assembly against unintended rotation when required.
- Inspect the hook connection to ensure that it cannot disengage if tension changes.
Inspection and Maintenance
- Check for bent hooks, elongated eyes and distorted bodies
- Inspect threads for stripping, corrosion and insufficient engagement
- Check the zinc coating for excessive damage or rust
- Verify that the body has not rotated loose during service
- Replace components showing cracks, permanent deformation or severe wear
- Do not weld, heat, straighten or modify a loaded turnbuckle
Quality Inspection
- Raw-material and dimensional inspection
- Metric thread size, pitch and fit inspection
- Right-hand and left-hand thread verification
- Hook opening and eye-diameter inspection
- Body straightness and alignment inspection
- Zinc-coating appearance and thickness inspection
- Tensile testing when specified in the purchase contract
- Packaging, marking and quantity inspection
Reference Standards
- DIN 1480:2005-09 – Forged turnbuckles, open type
- ISO 1461:2022 – Hot-dip galvanized coatings on fabricated iron and steel articles
- ISO 2081:2025 – Electroplated zinc coatings on iron and steel
- ISO 4042 – Electroplated coating systems for fasteners, when applicable
- Customer drawings and project-specific mechanical requirements
Reference to DIN 1480 or a coating standard does not constitute product certification. Conformity must be verified using the approved drawing, inspection records and test documents for the exact product supplied.
Ordering Information
Please provide the following information when requesting a quotation:
- Required thread size
- Hook-and-eye terminal configuration
- Minimum and maximum required overall length
- Required adjustment range
- Hook opening and eye inside diameter
- Carbon-steel material grade
- Zinc-plated or hot-dip galvanized finish
- Required coating thickness
- Expected tensile load and application
- Required drawings, certificates and test reports
- Order quantity and packaging requirements
Frequently Asked Questions
What is the purpose of a hook-and-eye turnbuckle?
It adjusts the length and tension of a guy wire, steel wire rope or other static tensile assembly by rotating the open central body.
Does DIN 1480 specify a working load limit?
The DIN 1480 dimensional reference must not be treated as an automatic working load rating for every finished assembly. Any published load capacity must be supported by the material specification, finished-product design and mechanical test data.
Can this turnbuckle be used for lifting?
Not unless the exact finished product has been designed, tested, marked and certified for the intended lifting operation. A general DIN 1480-type hook-and-eye turnbuckle should be presented as a static tensioning fitting.
What is the difference between zinc plating and hot-dip galvanizing?
Zinc plating normally produces a thinner and smoother coating. Hot-dip galvanizing generally provides a thicker zinc layer for outdoor and more corrosive environments.
Why does the turnbuckle use two different thread directions?
One end uses a right-hand thread and the other uses a left-hand thread. This allows both terminals to move inward or outward simultaneously when the body is rotated.
Is the hook end suitable for permanent critical connections?
An open hook can disengage if the assembly becomes slack or moves unexpectedly. Eye-and-eye or jaw-end turnbuckles should be considered where a captive connection is required.
