Eye-Jaw Turnbuckles
Holloway Houston provides high-performance eye-jaw turnbuckles engineered for assemblies where connection types differ at each attachment point. We stock an extensive inventory of components and complete units from Crosby and Green Pin, featuring working load limits from 800 lbs up to 75,000 lbs to handle complex tensioning requirements in construction, marine, and industrial rigging.
Eye-Jaw Turnbuckles for Mixed-End Tension Assemblies
An eye-jaw turnbuckle represents a hybrid tensioning solution, combining a closed loop (eye) on one end with a U-shaped clevis (jaw) on the other. This "mixed-end" configuration is the industry standard for rigging systems where one side must connect to a permanent shackle or thimble, while the other side pins directly into a structural lug, tang, or bracket. By integrating two different fittings on a single threaded body, riggers can eliminate the need for extra Rigging shackles and reduce the total weight and footprint of the tensioning assembly.
At Holloway Houston, our eye-jaw turnbuckles are sourced from the global benchmarks of metallurgical quality: Crosby and Green Pin (Van Beest). As the body is rotated, the opposing internal threads draw both end fittings inward simultaneously, applying precise tension to the linear assembly. With over 65 years of rigging expertise, Holloway Houston ensures every mixed-end turnbuckle meets the rigorous requirements of ASME B30.26 and federal specification FF-T-791b, providing the reliability needed for high-stakes oilfield, offshore, and construction applications.
Technical Versatility in Rigging
The defining advantage of the eye-jaw turnbuckle is its ability to bridge different hardware interfaces. For example, in a tower guy-wire system, the eye end often connects to a Wire rope thimble and shackle, while the jaw end pins directly to a ground anchor rod. This direct-connection capability minimizes "stacking height" and reduces potential points of failure. Holloway Houston specialists assist clients in matching the proper Working Load Limit (WLL) and thread diameter to ensure the assembly maintains the required safety design factor across both fitting types.
Types of Eye-Jaw Turnbuckles Available at Holloway Houston
Industrial environments demand varying capacities and corrosion resistances. We maintain a diverse stock of the world’s most trusted models and component parts.
Crosby HG-227 Eye-Jaw Turnbuckle
The Crosby HG-227 is the industry standard for forged mixed-end turnbuckles. Each unit is quenched and tempered for maximum strength and features a hot-dip galvanized finish to resist environmental degradation. We stock the HG-227 in thread sizes starting at 5/16" and scaling up to 2-3/4" for heavy-lift applications. These units are proof-tested at the factory to verify structural integrity under extreme tension.
Green Pin G-6315 Series
Manufactured by Van Beest in the Netherlands, the Green Pin G-6315 is favored for offshore and marine applications. Known for precision threading and high-grade carbon steel construction, Green Pin turnbuckles provide an exceptional alternative for projects requiring metric-spec ratings and European compliance certifications alongside ASME standards.
Component-Based Assemblies: HG-2510 & HG-4037
Because many eye-jaw configurations are custom-built to specific project needs, Holloway Houston stocks the individual components:
- Turnbuckle Bodies (Crosby HG-2510) : Available in take-up lengths from 4.5" to 24".
- Turnbuckle Jaw Ends (HG-4037) : Available in both right-hand and left-hand threads.
- Matched Eye Ends : Designed to thread seamlessly into HG-2510 bodies.
Technical Specifications: Size, Capacity, and Take-Up
Selecting the right eye-jaw turnbuckle requires matching the body thread diameter to the load and the take-up length to the required adjustment range.
1. Working Load Limit (WLL)
Holloway Houston provides hardware categorized by rated capacity:
- Light-to-Mid Duty (800 – 7,200 lbs) : Standard for utility bracing and light guy wires.
- Heavy Duty (10,000 – 37,000 lbs) : Used in industrial tie-backs and large-scale mooring.
- Super Heavy Duty (60,000 – 75,000 lbs) : Essential for bridge suspension and heavy offshore structural tensioning.
2. Take-Up Length Options
The "take-up" refers to the distance the fittings can move toward the center. Holloway Houston stocks a massive range:
- Short Take-Up (4.5" to 6") : For tight spaces and precision fits.
- Mid-Range Take-Up (9" to 12") : The standard for most structural steel bracing.
- Long Take-Up (18" to 24") : Essential for long Wire rope slings where significant initial slack must be removed.
Eye-Jaw Turnbuckle Applications by Industry
- Construction : Diagonal bracing where one end attaches to a shackle on a main member and the other pins into a secondary bracket
- Offshore & Marine : Standing rigging for vessel masts where deck hardware uses pin-through clevises, but the cable termination uses a shackle.
- Telecommunications : Guy-wire tensioning for cellular towers, connecting shackled wire rope to fixed anchor rods
- Industrial & Petrochemical : Pipe support systems in refineries where mixed connection hardware is the standard design specification.
- Stage & Entertainment : Tensioning grids and trusses where one end pins to a truss plate and the other connects to a shackled dead-hang point.
Selection Guide: How to Choose the Right Assembly
To ensure a safe and compliant system, consider these factors when ordering from Holloway Houston:
- Alignment : Turnbuckles are for straight-line tension only. Any angular loading will bend the threaded shanks, drastically reducing WLL.
- Fitting Compatibility : Ensure the jaw end pin diameter matches your lug hole and the eye end opening fits your Rigging shackle pin.
- Thread Engagement : For the turnbuckle to reach its rated strength, the end fittings must be threaded into the body by a depth at least equal to the thread diameter.
- Environment : For corrosive saltwater environments, specify hot-dip galvanized finishes (Crosby HG-series or Green Pin G-series).
Safety, Inspection, and Maintenance
As critical load-bearing components, eye-jaw turnbuckles require visual inspection before every shift.
- Thread Health : Check for galling, stripping, or flattened threads. Threads should be lubricated to ensure smooth adjustment.
- Deformation : Inspect the eye for "elongation" and the jaw for "spreading." If the jaw opening has widened by more than 10% of its original dimension, it must be removed from service.
- Pin Security : Ensure the jaw pin is fully engaged and secured with the original cotter pin or nut.
- ASME Compliance : Per ASME B30.26, turnbuckles must be retired if they show a 10% reduction in any original dimension or if the body or shanks are bent or twisted.
Frequently Asked Questions
It is a tensioning device with one closed-loop end (eye) and one clevis end (jaw). It allows for two different attachment methods on a single tension line.
Yes. At Holloway Houston, we stock Crosby bodies and Jaw ends separately. You can combine a right-hand jaw and a left-hand eye (or vice-versa) with a matching body to create a custom assembly.
Use a jaw end when connecting directly to a structural plate or lug with a hole. Use an eye end when connecting to a shackle, hook, or a cable that is terminated with a thimble.
Yes. Every turnbuckle unit or component assembly we sell can be provided with manufacturer material certifications and proof-test certificates upon request.
The primary standard is ASME B30.26, which covers the design, marking, inspection, and maintenance of rigging hardware.
Complete Your Rigging System
Holloway Houston provides all the hardware needed for a complete tensioning assembly:
- Rigging Shackles : Connect eye ends to anchor points.
- Wire Rope Slings : Custom-fabricated in Houston to match your capacity needs.
- Eye-Eye Turnbuckles : For dual-eye configurations.
- Jaw-Jaw Turnbuckles : For dual-jaw configurations.
Safety Disclaimer : Turnbuckles are load-bearing rigging components. Proper selection, inspection, and use require training consistent with ASME B30.26 and applicable OSHA standards. The information on this page is provided for general product awareness and does not replace qualified engineering judgment, manufacturer documentation, or site-specific lift planning.