Turnbuckle Eye and Hook Product Overview
GUANGTONG METAL supplies eye and hook turnbuckles for wire rope tensioning, cable adjustment and general-purpose connection systems. These adjustable fittings feature an open-frame body with a closed eye at one end and an open hook at the other, providing a combination of secure eye-end attachment and convenient hook-end connection. For a fully closed connection, see also our eye and eye turnbuckle.
Eye and hook turnbuckles are available in galvanized carbon steel and stainless steel configurations, subject to specification and production availability. Stainless steel options may include AISI 304 and AISI 316 for applications requiring enhanced corrosion resistance.
The turnbuckle operates through opposite-hand threaded end fittings. Rotating the central body changes the effective assembly length, allowing cable tension to be adjusted without disconnecting the complete wire rope assembly.
The listed nominal thread sizes range from M4 to M24, making these fittings suitable for various fencing, agricultural trellis, architectural cable and general industrial applications.
Material and Surface Finish Options
Galvanized Carbon Steel Eye and Hook Turnbuckles
Galvanized carbon steel eye and hook turnbuckles provide a cost-effective solution for general-purpose wire rope tensioning and cable connection systems.
Zinc coating protects the carbon steel substrate through a sacrificial corrosion protection mechanism. The appropriate coating method depends on the environmental exposure, product dimensions and customer specifications.
Electro-Galvanized Finish
Electro-galvanizing produces a relatively thin, uniform zinc coating with a smooth surface appearance. It is commonly used for general-purpose hardware and installations with relatively limited environmental exposure.
Hot-Dip Galvanized Finish
Hot-dip galvanizing generally provides a thicker zinc coating and can offer improved durability in many outdoor environments. Thread tolerances and coating thickness must be considered to ensure proper assembly and adjustment.
Galvanized carbon steel turnbuckles may be selected for fencing, agricultural trellis structures, landscaping and other suitable cable tensioning applications.
AISI 304 Stainless Steel Eye and Hook Turnbuckles
AISI 304 stainless steel provides good general corrosion resistance in many indoor and outdoor environments.
Its chromium-rich passive layer helps resist atmospheric corrosion without requiring a zinc coating.
304 stainless steel turnbuckles may be selected for architectural cable systems, landscaping structures, indoor equipment and general outdoor wire rope assemblies.
AISI 316 Stainless Steel Eye and Hook Turnbuckles
AISI 316 stainless steel contains molybdenum, which improves resistance to localized corrosion in many chloride-containing environments compared with AISI 304.
316 stainless steel eye and hook turnbuckles may be preferred for coastal installations, marine-adjacent environments and applications involving increased humidity or salt exposure.
However, stainless steel is not completely corrosion-proof. Proper installation, cleaning and maintenance remain important, particularly in environments where chloride deposits and crevice corrosion may occur.
Key Features
Eye and Hook Connection Design
The closed eye end provides a connection point for compatible shackles, pins or other suitable fittings, while the open hook end allows convenient attachment to compatible anchor points.
The eye end can provide improved connection retention compared with an open hook when correctly assembled with an appropriate connecting component. However, overall connection security also depends on the open-hook end.
Adjustable Cable Tension
The opposite-hand threaded fittings allow simultaneous adjustment when the central body is rotated, making it possible to increase or decrease the effective length of the cable assembly.
Multiple Material Options
Galvanized carbon steel and stainless steel configurations can be considered according to corrosion exposure, appearance, mechanical requirements and project budget.
Wide Size Range
Nominal thread sizes from M4 to M24 provide dimensional options for different wire rope tensioning and cable connection requirements.
Open Body Construction
The open-frame design allows visual inspection of threaded fittings and convenient adjustment during installation and maintenance.
Bulk Supply and OEM Support
Material grades, surface finishes, dimensions, packaging and labeling requirements can be discussed for wholesale and project procurement orders.
Technical Specifications
The following dimensional information is based on the supplied eye and hook turnbuckle specification chart.
| Size | C (mm) | D (mm) | S (mm) | L (mm) | L1 (mm) | Adjustable Distance (mm) |
|---|---|---|---|---|---|---|
| M4 | 9.30 | 5.00 | 7.50 | 60.00 | 107.00 | 39.00 |
| M5 | 9.70 | 5.00 | 7.50 | 73.00 | 124.00 | 59.00 |
| M6 | 10.50 | 6.00 | 9.60 | 91.00 | 150.00 | 64.00 |
| M8 | 12.50 | 8.00 | 9.60 | 122.80 | 192.00 | 96.00 |
| M10 | 15.00 | 10.00 | 11.30 | 150.00 | 240.00 | 115.00 |
| M12 | 17.50 | 12.00 | 18.40 | 197.00 | 303.00 | 163.00 |
| M16 | 26.50 | 16.00 | 21.80 | 249.00 | 385.00 | 193.00 |
| M20 | 30.10 | 20.00 | 22.10 | 299.00 | 465.00 | 232.00 |
| M24 | 24.90 | 24.00 | 23.70 | 356.00 | 531.00 | 269.00 |
Packaging and Approximate Weight
| Size | Packing Quantity (pcs/bag) | Approx. Weight (kg/1,000 pcs) |
|---|---|---|
| M4 | 100 | 35.40 |
| M5 | 100 | 39.00 |
| M6 | 50 | 76.90 |
| M8 | 20 | 133.20 |
| M10 | 10 | 262.00 |
| M12 | 10 | 478.00 |
| M16 | 2 | 1006.00 |
| M20 | 2 | 1958.00 |
| M24 | 2 | 3390.00 |
Technical Note: Dimensions and approximate weights are based on the supplied specification chart. C, D, S, L and L1 correspond to the original supplier’s dimensional labels. The chart does not specify Working Load Limit (WLL), Minimum Breaking Load (MBL) or material-specific dimensional tolerances. All specifications should be verified before order confirmation.
Applications
Wire Rope Tensioning Systems
Eye and hook turnbuckles are used in compatible wire rope assemblies to adjust cable tension and maintain alignment during installation and maintenance.
Agricultural Trellis and Vineyard Systems
Galvanized carbon steel eye and hook turnbuckles may be used in vineyard trellis structures, crop support systems and agricultural cable installations requiring adjustable tensioning connections.
Fencing and Boundary Cable Systems
These turnbuckles can be incorporated into suitably designed fencing and boundary cable installations where controlled tension adjustment is required.
Architectural and Landscaping Applications
Stainless steel configurations may be selected for architectural cable systems, garden structures and exposed installations where appearance and corrosion resistance are important.
Marine and Coastal Environments
AISI 316 stainless steel eye and hook turnbuckles may be considered for selected marine-adjacent cable installations, subject to corrosion exposure, mechanical loading and connection security requirements.
General Industrial Applications
Eye and hook turnbuckles can be used in appropriately designed cable alignment, equipment positioning and non-lifting tension adjustment systems.
Installation and Safety Guidelines
- Select the appropriate turnbuckle size, material and verified load capacity for the intended application.
- Inspect the turnbuckle body, eye, hook and threads for damage before installation.
- Connect the eye end using a compatible and appropriately rated connecting fitting.
- Attach the hook end to a suitable anchoring point and ensure that the connection cannot disengage under the expected operating conditions.
- Rotate the central body to adjust the effective length and tension of the cable assembly.
- Maintain sufficient thread engagement at both ends according to the manufacturer’s instructions.
- Avoid excessive tightening, side loading, shock loading and conditions that could cause the open hook to disengage.
- Inspect the assembly regularly for corrosion, loosening, deformation and thread damage.
Safety Notice: General-purpose eye and hook turnbuckles must not be assumed suitable for overhead lifting, fall protection, personnel support or other safety-critical applications. Such uses require appropriately designed and rated products with verified load capacities.
Quality Control
GUANGTONG METAL supports specification-based inspection requirements for wire rope fittings and accessories.
Depending on the order requirements, inspection may include:
- Material grade verification
- Dimensional and thread size inspection
- Eye and hook geometry inspection
- Thread engagement and adjustment checks
- Surface finish and coating inspection
- Visual inspection for defects and deformation
- Packaging quantity and approximate weight verification
- Product labeling and carton marking checks
Additional mechanical testing, material documentation and inspection reports should be agreed upon before order confirmation.
OEM and Bulk Supply
GUANGTONG METAL supplies wire rope accessories for distributors, industrial buyers, cable assembly manufacturers and project procurement customers.
Order requirements may include:
- Galvanized carbon steel and stainless steel material options
- AISI 304 and AISI 316 stainless steel grades
- Electro-galvanized and hot-dip galvanized finishes
- M4–M24 nominal thread sizes
- Specified dimensions and adjustment ranges
- Customized packaging and carton markings
- Product labeling and export documentation
- Inspection and testing requirements
Please contact our sales team to confirm the available materials, surface finishes, dimensional standards, minimum order quantities and delivery schedules.
FAQ
What is an eye and hook turnbuckle?
An eye and hook turnbuckle is an adjustable threaded fitting featuring a closed eye at one end and an open hook at the other. It is used to adjust the effective length and tension of compatible cable and wire rope assemblies.
What is the difference between eye and hook and hook and hook turnbuckles?
Eye and hook turnbuckles have one closed eye and one open hook, while hook and hook turnbuckles have two open hooks. The closed eye can provide a more retained connection when used with an appropriate shackle or pin, while the hook allows convenient attachment and removal.
What materials are available?
Galvanized carbon steel and stainless steel configurations may be available. Stainless steel options can include AISI 304 and AISI 316, depending on the specific product and production requirements.
Which material is better for outdoor applications?
Galvanized carbon steel can provide economical corrosion protection for many outdoor installations. Stainless steel may be preferred where corrosion resistance and appearance are important. AISI 316 generally offers better resistance to chloride-related localized corrosion than AISI 304.
What sizes are available?
The listed nominal thread sizes range from M4 to M24, including M4, M5, M6, M8, M10, M12, M16, M20 and M24.
Are eye and hook turnbuckles manufactured according to DIN 1480?
The applicable manufacturing and dimensional standard must be confirmed for the specific product. Compliance with DIN 1480 or another standard should not be assumed solely from the product appearance or size range.
Can eye and hook turnbuckles be used for lifting?
General-purpose eye and hook turnbuckles should not be used for overhead lifting unless the specific product is designed, tested and rated for that purpose.
Can you provide OEM packaging?
Customized packaging, labeling, carton markings and export packing arrangements can be discussed according to order requirements.
What information is required for a quotation?
Please provide the nominal thread size, material grade, surface finish, quantity, intended application, packaging requirements and destination country.