Galvanized steel hook-and-hook turnbuckle with open body and visible threaded studs on white background

Turnbuckles

Open Body Turnbuckle JIS Frame Type Forged Steel

A drop-forged carbon steel turnbuckle with an open frame design, compliant with JIS standards, used to adjust tension in chains, wire ropes, or rods. Available in hook-hook, eye-eye, hook-eye, and stud-stud configurations, it allows direct visual inspection of the threaded section and is suitable for marine, construction, and lifting rigging applications where access and maintenance matter.

Size: 6mm-50mm
Material: Carbon Steel
Type: JIS Frame Process: Drop Forged Surface: Electric Galvanized
Packing: Cartons or Gunny Bags and then on Pallets
Catalogue Family: Turnbuckles
Certificates: EN 10204 3.1 material test certificate on request

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Key Benefits

What JIS Frame Type Turnbuckle Gives You

Open frame design allows direct visual inspection of threads and wear on the adjusting section
Drop-forged carbon steel body provides high strength and impact resistance for dynamic rigging
JIS-compliant frame dimensions ensure interchangeability with other JIS standard rigging components
Multiple end types (hook, eye, stud) allow flexible connection to anchors, chains, or rigging points

Electric galvanized finish resists corrosion in humid, marine, and outdoor environments
Threaded adjustment mechanism enables precise tension control without disassembly
Compact open design reduces weight compared to enclosed turnbuckles while maintaining strength

Application Scenarios

Where JIS Frame Type Turnbuckle Is Used

Adjusting tension in wire rope stays on offshore crane booms where access for inspection is required
Tightening chain slings on heavy machinery during transport to prevent slack and movement
Tensioning guy wires on temporary construction scaffolds with frequent adjustments

Setting up rigging systems on marine vessels where corrosion resistance and visibility are critical
Field adjustments in mining and drilling projects where components are exposed to dust and vibration
Reconfiguring rigging setups on construction sites with changing load paths and anchor points

Who It Is For

Buyers This Product Is Built For

Marine rigging contractors needing JIS-compliant turnbuckles for shipboard or offshore use
Construction site supervisors managing temporary rigging with frequent tension adjustments
Lifting equipment suppliers integrating turnbuckles into chain and wire rope systems

Industrial maintenance teams requiring visible thread condition checks during routine inspections
Rigging fabricators sourcing standardised open-frame turnbuckles for custom assemblies

Problems It Solves

Problems This Product Removes

Inability to inspect threaded sections in enclosed turnbuckles during routine checks
Over-tightening or under-tensioning due to lack of visual feedback on thread engagement
Mismatched thread standards between turnbuckles and other rigging components

Corrosion damage in humid environments due to inadequate surface protection
Need for multiple turnbuckle types when a single open-frame design with multiple ends can serve several roles
Delays in field adjustments caused by complex disassembly of sealed turnbuckle housings

Technical Features

Drop-forged carbon steel body with JIS frame dimensions
Open frame construction for full access to threaded section
Available in hook-hook, eye-eye, hook-eye, and stud-stud end configurations
Electric galvanized surface finish for corrosion resistance

Threaded adjustment mechanism with right-hand and left-hand threads
Standard 4:1 design factor unless otherwise stated
Working load limit stamped on the body for traceability
Suitable for use in chain, wire rope, and rod tensioning systems

Specifications

JIS Frame Type Turnbuckle Specifications

Values published in the Kailipu catalogue for this item. Anything not listed is available on request.

Material	Carbon steel
Type	JIS Frame Open Body Turnbuckle
Process	Drop forged
Surface Finish	Electric galvanized
Size Range	6mm to 50mm thread diameter
End Types	Hook-hook, Eye-eye, Hook-eye, Stud-stud
Design Factor	4:1 standard
Working Load Limit	Stamped on body

Materials

Materials And Finishes

Carbon steel drop-forged body for high tensile strength and durability
Electric galvanized coating applied after forging for corrosion resistance

Threaded rods made from heat-treated carbon steel to resist deformation under load
End fittings formed from the same carbon steel and galvanized after assembly

Manufacturing Process

How This Product Is Made

1Raw carbon steel billets heated and drop forged into the frame and threaded rod blanks

2Heat treatment to improve strength and toughness of the forged parts

3Machining of threads and end fittings to JIS frame dimensions

4Assembly of threaded rods into the open frame body

5Electric galvanizing of the complete unit to provide a protective zinc layer

6Stamping of working load limit and manufacturer mark on the body

7Final inspection and packing

Quality Control

Quality Control On Every Batch

Proof load testing on production batches before release
Dimensional tolerance check against JIS frame and thread standards
Breaking strength validation to confirm the 4:1 design factor
Visual inspection of threads and galvanizing for defects or missing coating

Working load limit marking verified for legibility and correct placement
Material Test Certificate to EN 10204 3.1 supplied with orders on request
Third-party inspection accepted at the Qingdao warehouse before shipment

Customisation

Customisation Options

Custom tonnage stamping on the body for traceability
Private label and OEM marking available
Custom surface finish including zinc plating, powder coating, or electrophoretic black

Custom end configurations built to a supplied drawing
Carton and pallet packing configured for warehouse or retail handling

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
Closed-body turnbuckle	The open frame allows direct thread inspection and easier adjustment but offers less protection against debris and corrosion
Enclosed turnbuckle with plastic housing	The open frame is stronger and more visible but lacks the dust and moisture sealing of a plastic-encased version
Threaded rod with nuts	The turnbuckle provides a single integrated adjustment point with better load distribution and alignment
Screw-type tensioner	The turnbuckle has higher strength and better fatigue resistance for repeated tensioning cycles

Use Guide

How To Use And Inspect JIS Frame Type Turnbuckle

Verify the stamped working load limit matches the expected load before use
Inspect threads and galvanizing for damage or corrosion before each use
Adjust tension gradually and evenly on both sides to avoid bending or misalignment
Ensure the turnbuckle is aligned with the load path to prevent side loading
Retire the unit if threads are stripped, the body shows deformation, or the finish is compromised
Use the correct wrench size to avoid rounding the hex flats on the threaded rods