Turnbuckles
Turnbuckle Stub end HG-251 U.S. Federal Specification
A three-piece turnbuckle assembly consisting of two stub end fittings and a body with opposite-hand threads, designed to adjust tension and remove slack in rigging systems. It is not intended for lifting. Available in carbon steel, die-cast, or corrosion-resistant stainless steel with hot-dipped galvanizing. Sizes range from 1/4"x4" to 13/4"x24" with working load limits from 400 lbs to 34,000 lbs. Complies with U.S. Federal Specification FF-T-791B for stub/stub configurations.
- Size
- From 1/4"x4" to 2-3/4x24
- Material
- Carbon Steel / Stainless Steel Surface: Hot Dipped Galvanized W.L.L: From 400 lbs Tons to 34000 lbs
- Packing
- Cartons or Gunny Bags and then on Pallets
- Catalogue Family
- Turnbuckles
- Certificates
- EN 10204 3.1 material test certificate on request
CAD files are supplied on request via WhatsApp or email rather than published for open download.
Key Benefits
What Turnbuckle Stub End Gives You
- Adjusts tension and removes slack in rigging without requiring disassembly of the main line
- Opposite-hand threading on the body draws both stub ends in simultaneously for balanced tensioning
- Reduces wear and fatigue on cables, ropes, and tie rods by maintaining consistent tension
- Galvanized or stainless steel options resist corrosion in outdoor, marine, and industrial environments
- 5:1 safety factor ensures reliable performance under dynamic and sustained loads
- Compact design reduces bulk compared to using separate turnbuckles and connectors
- Standardized dimensions per U.S. Federal Specification FF-T-791B allow for interchangeability across systems
Application Scenarios
Where Turnbuckle Stub End Is Used
- Tensioning guy wires on temporary steel structures or scaffolding during construction
- Adjusting length and tension in tie rods for bridge or crane support systems
- Securing cargo on flatbed trailers using lashing straps and tensioning turnbuckles
- Maintaining tension in mooring lines on offshore platforms or marine vessels
- Balancing load distribution in multi-point suspension systems for industrial equipment
- Towing and recovery setups where line tension must be fine-tuned in the field
- Supporting overhead structures in mining or drilling rig installations
Who It Is For
Buyers This Product Is Built For
- Construction contractors specifying rigging for temporary structures and scaffolds
- Marine and offshore engineers managing mooring and anchoring systems
- Logistics and transport fleets requiring adjustable lashing hardware for cargo securement
- Industrial maintenance teams maintaining tension in crane and hoist support systems
- Rigging distributors carrying standardized turnbuckle assemblies with federal compliance
- Manufacturers of industrial equipment needing tensioning components for assembly
Problems It Solves
Problems This Product Removes
- Inconsistent tension in rigging systems due to slack in cables or ropes over time
- Need to manually re-tighten or reposition fittings during setup or operation
- Corrosion damage to rigging components in harsh or wet environments
- Lack of standardized components that meet U.S. Federal Specification FF-T-791B
- Buying separate turnbuckle bodies and end fittings from different suppliers
- Inability to adjust tension without disconnecting and reassembling the rigging line
- Risk of over-tensioning or uneven load distribution when using non-synchronized fittings
Technical Features
Technical Features
- Three-piece assembly: two stub end fittings and a body with left-hand and right-hand threads
- Opposite-hand threading allows simultaneous draw-in of both ends when the body is rotated
- Designed for tension adjustment and slack removal, not for lifting
- Complies with U.S. Federal Specification FF-T-791B for stub/stub turnbuckles
- Standard 5:1 safety factor between minimum breaking load and working load limit
- Available in carbon steel, die-cast, or corrosion-resistant stainless steel
- Surface finish: hot-dipped galvanized or as specified for corrosion resistance
- Working load limit stamped on the body for traceability and field identification
Specifications
Turnbuckle Stub End Specifications
Values published in the Kailipu catalogue for this item. Anything not listed is available on request.
| Material | Carbon Steel / Stainless Steel / Die-Cast |
|---|---|
| Surface Finish | Hot Dipped Galvanized |
| Size Range | 1/4"×4" to 13/4"×24" |
| Safety Factor | 5:1 |
| Thread Type | Left-hand on one end, right-hand on opposite end |
| Application | Lashing, Towing, Suspension, Tension Adjustment |
| Compliance | U.S. Federal Specification FF-T-791B |
| Packing | Cartons or Gunny Bags on Pallets |
Full size table on request. The catalogue publishes a full dimension and capacity table for this item. Ask on WhatsApp or by email and we will send it as a PDF.
Materials
Materials And Finishes
- Carbon steel body and stub ends for high strength and cost efficiency
- Corrosion-resistant stainless steel option for marine and chemical environments
- Die-cast construction for lightweight and precision-molded components
- Hot-dipped galvanizing layer for long-term resistance to rust and moisture
- Stainless steel components where high corrosion resistance is required
Manufacturing Process
How This Product Is Made
1Forging or casting of stub end fittings and turnbuckle body blanks
2Machining of internal and external threads to precise tolerances
3Heat treatment of carbon steel components for strength and durability
4Assembly of the three-piece unit with proper thread engagement
5Application of hot-dipped galvanizing or other surface finish
6Stamping of working load limit and product markings on the body
7Final inspection and packaging for export
Quality Control
Quality Control On Every Batch
- Proof load testing on production batches to verify 5:1 safety factor
- Dimensional tolerance check against U.S. Federal Specification FF-T-791B tables
- Breaking strength validation to confirm minimum breaking load
- Visual inspection for thread integrity, surface defects, and finish uniformity
- Working load limit marking verified on each unit
- Material Test Certificate to EN 10204 3.1 supplied on request
- Third-party inspection accepted before shipment
Customisation
Customisation Options
- Custom tonnage stamping on the body to match specific load requirements
- Private label and OEM marking available for brand integration
- Surface finish options: hot-dipped galvanized, powder coated, or electrophoretic black
- Custom sizes and thread configurations built to a supplied drawing
- Packing configuration adjusted for carton count, pallet pattern, or retail needs
Compare
How It Compares With The Alternatives
An honest read on where this pattern wins and where another one would serve you better.
| Alternative | Honest Trade Off |
|---|---|
| Eye/Eye Turnbuckle | The stub/stub version is more compact and suitable for tight spaces but lacks the eye end for direct attachment to hooks or rings |
| Hook/Hook Turnbuckle | The stub/stub design avoids the need for hook fittings, reducing weight and bulk while still allowing tension adjustment |
| Screw Pin Shackle | The turnbuckle provides continuous tension adjustment, whereas a shackle requires re-threading or repositioning to adjust length |
| Adjustable Cable Tensioner | The turnbuckle offers higher strength and standardized compliance but is less flexible in adjustment range than some mechanical tensioners |
Use Guide
How To Use And Inspect Turnbuckle Stub End
- Use only for tension adjustment and slack removal, not for lifting or supporting loads
- Ensure both stub ends are fully engaged in the body before applying tension
- Rotate the body clockwise to tighten and counterclockwise to loosen
- Check that the turnbuckle body rotates freely and threads are not binding
- Do not exceed the stamped working load limit under any condition
- Inspect for thread wear, corrosion, or deformation before each use
- Retire the unit if the body shows cracks, the threads are stripped, or the marking is illegible
Related Products
Often Ordered With This Item
HD Turnbuckle Jaw Jaw, Heavy Duty Turnbuckles
Stainless Steel Turnbuckle H/E, H/H, E/E
Aluminum Body Turnbuckle Hook and Eye Alu Closed Body
Aluminum Turnbuckles Eye and Eye Alu Closed Body
Aluminum Turnbuckle Hook and Hook Alu Closed Body
Wire Rope Turnbuckle Commercial Type Malleable Steel
Turnbuckles hook and hook Commercial Type Malleable Steel
Galvanized Turnbuckle Eye/Eye Commercial Type Malleable Steel
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Answers
Turnbuckle Stub End FAQ
Is this turnbuckle rated for lifting?
No. It is designed only for adjusting tension and removing slack in rigging systems, not for lifting or supporting loads.
What safety factor does it carry?
A standard 5:1 safety factor, meaning the minimum breaking load is five times the stated working load limit.
Does it comply with U.S. Federal Specification FF-T-791B?
Yes. It meets the requirements for stub/stub turnbuckles under U.S. Federal Specification FF-T-791B.
Can you provide a Material Test Certificate?
Yes. A Material Test Certificate to EN 10204 3.1 is supplied on request with each order.
What materials are available?
Carbon steel, die-cast, or corrosion-resistant stainless steel, with hot-dipped galvanizing as standard finish.
Can you customize the size or finish?
Yes. Custom sizes, thread configurations, surface finishes, and OEM marking are available upon request.
How are the units packed for export?
Standard packing is in cartons or gunny bags, then palletized. We can configure the packing to suit your warehouse or retail requirements.
Need A Quote On Turnbuckle Stub End
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