Eye-Eye Turnbuckles
Holloway Houston provides high-performance eye-eye turnbuckles designed for precise tension adjustment in wire rope and rod assemblies. We stock an extensive inventory from Crosby and Green Pin, featuring working load limits from 800 lbs up to 75,000 lbs to meet the demands of construction, marine, and industrial rigging.
Eye-Eye Turnbuckles for Rigging and Tensioning
An eye-eye turnbuckle is a foundational piece of tensioning hardware used to take up slack and apply a controlled load to a linear assembly. Characterized by a closed loop (eye) on both ends of a central threaded body, this configuration is ideal for connecting to components that are already in place, such as Rigging shackles, hooks, or fixed structural pins.
At Holloway Houston, our eye-eye turnbuckles are sourced from industry leaders like Crosby and Van Beest (Green Pin). By rotating the turnbuckle body, both threaded end fittings move inward or outward simultaneously. This allow riggers to adjust the length and tension of a cable or rod without rotating the entire assembly—a critical feature when working with heavy wire rope or fixed anchor points. With over 65 years of expertise, Holloway Houston ensures every turnbuckle we ship meets the rigorous standards of ASME B30.26 and federal specification FF-T-791b.
The Engineering of Adjustable Tension
The mechanical advantage of a turnbuckle lies in its dual-threaded design. One end of the body features a right-hand thread, while the other features a left-hand thread. This allows for rapid tensioning. Holloway Houston specialists assist clients in matching the correct Working Load Limit (WLL) and thread diameter to ensure the turnbuckle remains the strongest link in the tensioning system, whether it’s for a simple fence wire or a massive tower guy line.
Types of Eye-Eye Turnbuckles Available at Holloway Houston
Different industrial environments demand specific metallurgical properties and capacities. We maintain a diverse catalog of the world’s most trusted brands.
Crosby HG-226 Eye-Eye Turnbuckle
The Crosby HG-226 is the industry standard for forged eye-eye turnbuckles. Each unit is quenched and tempered for maximum strength and features hot-dip galvanized finish for superior corrosion resistance. We stock 26 different size combinations of the HG-226, with thread sizes starting at 5/16" and scaling up to a massive 2-3/4" for heavy-lift applications.
Green Pin G-6311 Eye-Eye Turnbuckle
Manufactured by Van Beest in the Netherlands, the Green Pin G-6311 is favored in marine and offshore environments. These turnbuckles are known for their precision manufacturing and high-grade carbon steel construction. The Green Pin line provides an exceptional alternative for projects requiring metric tonnage ratings and specific European compliance certifications alongside ASME standards.
Material Variations: Carbon vs. Alloy Steel
Holloway Houston offers turnbuckles in various material grades to match the severity of the environment.
- Galvanized Carbon Steel : The standard for most outdoor rigging and construction.
- Alloy Steel : Utilized in high-capacity models like the larger HG-226 sizes to provide higher WLLs without significantly increasing the footprint of the hardware.
Technical Specifications: Size, Capacity, and Take-Up
Selecting the right turnbuckle requires a precise understanding of the load and the required adjustment range.
1. Working Load Limit (WLL)
Holloway Houston provides turnbuckles categorized by their rated capacity:
- Light Duty (800 – 3,500 lbs) : Standard for utility bracing and light construction.
- Medium Duty (5,200 – 15,200 lbs) : Used in telecommunications and industrial pipe supports.
- Heavy Duty (21,400 – 75,000 lbs) : Essential for bridge suspension, mooring systems, and heavy structural tie-backs.
2. Take-Up Length
The "take-up" is the total distance the turnbuckle can shorten. Holloway Houston stocks take-up lengths from 4.5 inches to 24 inches. It is vital to select a take-up length that provides enough "room to move" for future adjustments as the wire rope stretches or the structure settles.
3. Thread Diameter and Compatibility
Thread size is directly tied to the WLL. A 1-inch thread diameter on an HG-226 provides a 10,000 lb WLL. We ensure that our eye ends are dimensionally compatible with standard shackle pins to prevent "point loading" and uneven wear.
Eye-Eye Turnbuckle Applications by Industry
- Construction : Used in diagonal cable bracing for structural steel and as tensioning elements in precast concrete assemblies.
- Telecommunications : Vital for guy-wire tensioning on radio and cellular towers to ensure stability against wind loads.
- Marine & Offshore : Standing rigging for vessel masts and mooring line tensioning where the eye connects directly to deck hardware.
- Stage & Entertainment : Tensioning overhead lighting grids and safety cables where a closed-loop connection prevents accidental disengagement.
- Petrochemical : Pipe support systems and structural tie-backs in refineries where constant tension is required to manage thermal expansion.
Selection Guide: How to Choose the Right Turnbuckle
When ordering from Holloway Houston, please consider the following selection criteria:
- Alignment: Turnbuckles are designed for straight-line tension only. Any angular loading or "side-loading" can cause the threaded ends to bend or fail.
- Take-Up Requirements: Always unthread the turnbuckle to its maximum safe opening before installation to ensure you have the full take-up range available for tensioning.
- Environment: For saltwater or high-humidity environments, our hot-dip galvanized Crosby and Green Pin models are mandatory to prevent oxidation and thread seizing.
- Locking Requirements: In high-vibration environments, turnbuckles must be locked. Holloway Houston provides Wire rope and specialized nuts to secure the body.
Safety, Inspection, and Maintenance
As critical load-bearing components, eye-eye turnbuckles require regular inspection to prevent failures.
- Thread Inspection : Before every installation, check threads for galling, stripping, or significant wear. Threads should be lubricated to ensure smooth adjustment under load.
- Eye Deformation : Inspect the eyes for "elongation." If the eye loop is no longer a perfect circle, the turnbuckle has likely been overloaded and must be removed from service immediately.
- Corrosion Assessment : While surface oxidation is normal on galvanized parts, "scaling" or deep pitting indicates a loss of structural steel and requires replacement.
- ASME Compliance : Per ASME B30.26, turnbuckles must be removed if they show a 10% reduction in any original dimension or if the body or end fittings are bent or twisted.
Frequently Asked Questions
An eye-eye turnbuckle has two closed loops. It requires a removable connector (like a shackle) to attach to a fixed point. A Jaw-Jaw turnbuckle has a U-shaped end with a pin, allowing it to connect directly to an eyelet or plate without extra hardware.
We stock eye-eye turnbuckles with WLLs ranging from 800 lbs to 75,000 lbs.
Turnbuckles are designed for tensioning and pulling, not as a primary lifting component in a sling assembly. However, they are used in "lifting systems" to level loads, provided the WLL is strictly observed and the application is engineered.
Yes. Regular lubrication prevents galling (cold welding of the threads) and ensures the turnbuckle remains adjustable over time, especially in corrosive environments.
While they often have similar WLLs for the same thread size, you must always follow the specific manufacturer’s load chart. substitution should only be done with approval from the project engineer.
In permanent or high-vibration installations, you should "safety wire" the turnbuckle. This involves threading a wire through the eyes and around the body to physically prevent rotation.
Complete Your Rigging System
Holloway Houston provides all the components required for a complete tensioning assembly:
- Rigging Shackles : The standard interface for eye-eye turnbuckle ends.
- Turnbuckle Bodies : For custom assemblies requiring different end fittings.
- Wire Rope Slings : Custom-fabricated in Houston to any length.
- Thimbles : Protect your wire rope eyes when connecting to turnbuckles.
Need a specialized size or high-capacity turnbuckle? Holloway Houston has access to specialized heavy-lift hardware beyond our standard catalog. Call our rigging specialists at 1-888-496-4700 or visit our facility at 5833 Armour Dr., Houston, TX 77020.