M45 SINGLE U-ADJUSTER / TENSIONER / DOG BONE SHACKLE:
Unlike traditional rope knots (which tend to jam under tension), the mechanical connection method of dog - bone shackles enables installation and disassembly to be completed in seconds. They are particularly suitable for high - frequency operation scenarios, such as sail changing on sailboats and cargo securing.
Crafted from premium materials such as alloy steel, carbon steel, or stainless steel (304/316), these shackles undergo heat treatment (quenching and tempering) to enhance tensile strength, wear resistance, and corrosion resistance-making them suitable for harsh environments like saltwater (marine operations) or outdoor construction sites. Most dog bone shackles comply with international standards (e.g., EN 12195-2, ASME B30.26) and are marked with load capacity, material grade, and manufacturer information for safety verification.
Their design offers key advantages: the streamlined central body reduces wind resistance in overhead lifting, while the reinforced end holes ensure stable pin insertion and prevent accidental disengagement. Available in various sizes (from 1/4" to 6" and above) and load ratings, dog bone shackles are essential for safe, efficient load handling in industrial, maritime, and logistics operations.
| M(MM) |
A(MM) |
E(MM) |
F(MM) |
T(MM) |
H1(MM) |
H2(MM) |
S(MM) |
C(MM) |
G(MM) |
N +0.5(MM) |
| 30 |
313 |
188 |
120 |
30 |
24 |
18 |
37 |
65 |
34 |
36 |
| 36 |
346 |
206 |
144 |
36 |
29 |
21 |
42 |
78 |
42 |
42 |
| 42 |
391 |
221 |
168 |
40 |
32 |
25 |
46 |
90 |
49 |
48 |
| 45 |
415 |
233 |
180 |
45 |
36 |
27 |
51 |
100 |
52 |
52 |
| 52 |
452 |
255 |
208 |
50 |
42 |
31 |
58 |
105 |
59 |
60 |
| 56 |
475 |
267 |
224 |
55 |
45 |
34 |
64 |
120 |
66 |
64 |
| 60 |
497 |
278 |
240 |
60 |
48 |
36 |
69 |
125 |
72 |
70 |
| 64 |
519 |
293 |
256 |
65 |
51 |
38 |
74 |
130 |
79 |
74 |
M36
M42
M45
Haosail Machinery Co., Ltd is a holding subsidiary of Haosail Group, which was founded in 2008. Loacted in Qingdao, Shandong provience, a beautiful seaside city. As the leading lifting and rigging hardware supplier, we provide integrated supply chain solutions on superior lifting & rigging products, including technical design, quality testing management and after sales services.
Our main products including: Lifting chain and accessories: G80 and G100 lifting chains, chain sling, all kinds of lifting hooks, connecting link, master links etc.; Rigging hardwares: various of lifting shackles, turnbuckles, eye bolts&eye nuts, wire rope sling fitting, wire rope clip, wire rope thimble etc.; Lifting equipment: chain/lever block, lifting blocks and clamps etc.; And other stainless steel rigging products.
1. Leading manufacture - One of the most professional high-quality forged product manufacturers in China with more than 20 years' production experience.
2.Strict quality control -- We are committed to providing high-quality products and services to meet our customers' needs and continually exceed their expectations.
3.Supply chain management - Improve efficiency, reduce costs, optimize quality control and risk management, while promoting innovation and collaboration. Achieve higher competitiveness and sustainable development through effective supply chain management.
4.Professional Service - We take customer feedback very seriously and have established a dedicated customer support team. We understand the importance of resolving any quality issues promptly and effectively. Our commitment is that if there is a quality issue with one of our products, our team will immediately initiate an investigation to fully understand the issue. We will work hard to identify the root cause and provide a satisfactory solution within 24-48 hours. Customer satisfaction is our top priority and we strive to exceed your expectations with every interaction.
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Q: What's the difference between dog bone shackles and standard D-shackles or bow shackles?
A: Unlike D-shackles (with a "D" shape, ideal for single-direction loads) or bow shackles (with a rounded "bow" shape, for multi-directional loads), dog bone shackles have a straight, cylindrical central body (resembling a dog bone). This design provides higher lateral stability for long-distance lifting or rigging, reduces stress concentration on the shackle body, and is often preferred for connecting multiple slings or hardware in linear load paths (e.g., marine mooring or construction crane rigging).
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Q: How do I select the right dog bone shackle for my lifting application?
A: Key selection factors include:
- Load capacity: Choose a shackle with a Working Load Limit (WLL) that exceeds the maximum expected load (never exceed the WLL to avoid failure).
- Material: Alloy steel for heavy industrial lifting (high strength), stainless steel for marine or food-processing environments (corrosion resistance), and carbon steel for general low-corrosion applications.
- Size: Match the shackle's pin hole diameter to the connecting hardware (e.g., sling hooks, chain links) to ensure a secure fit.
- Standards compliance: Opt for shackles meeting EN 12195-2 or ASME B30.26 to ensure safety and quality.
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Q: What maintenance is required to prolong the life of dog bone shackles?
A: Regular maintenance includes:
- Inspecting before each use: Check for cracks, bent pins, worn end holes, or corrosion (discard damaged shackles immediately).
- Cleaning after use: Remove dirt, oil, or salt deposits (use a neutral cleaner for stainless steel to prevent pitting).
- Lubrication: Apply anti-rust lubricant to the pin and hole connections to reduce friction and corrosion.
- Storage: Keep shackles in a dry, ventilated area (avoid moisture or direct sunlight) and hang them to prevent deformation.
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Q: Can dog bone shackles be used in marine or saltwater environments?
A: Yes, but only if they are made of corrosion-resistant materials. Stainless steel (316 is more corrosion-resistant than 304) or alloy steel with hot-dip galvanization is recommended for saltwater use. After marine operations, rinse the shackle thoroughly with fresh water to remove salt residue, then dry and lubricate to prevent rust and extend service life. Avoid using uncoated carbon steel dog bone shackles in saltwater, as they will corrode quickly.
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