Alloy Steel Lifting Chain Connecting Link
Product Description
Alloy Steel Lifting Chain Connecting Link Product Overview
Grade 80 Hammerlock Connecting Links (commonly known as Chain Coupling Links or Butterfly Links) are high-strength rigging hardware designed for fast, permanent on-site assembly and repair of lifting components. This heavy-duty dual-half coupling configuration allows riggers to securely join Grade 80 lifting chains to master links, hooks, shackles, and other end fittings without welding. It is widely trusted across industrial overhead crane lifting, heavy towing recovery, marine ports, and construction engineering.
Alloy Steel Lifting Chain Connecting Link Technical Specifications
Trade Size (in.) | Size (mm) | WLL (lbs) | WLL (t) | Weight (lbs/pc) | Inside Length (in.) | Inside Width (in.) | Material Thickness (in.) |
1/4" | 7 | 4,000 | 1.8 | 0.22 | 1.80 | 0.60 | 0.30 |
5/16" | 8 | 4,500 | 2.0 | 0.44 | 2.44 | 0.77 | 0.35 |
3/8" | 10 | 7,100 | 3.2 | 0.73 | 2.75 | 1.02 | 0.46 |
1/2" | 13 | 12,000 | 5.4 | 1.49 | 3.58 | 1.18 | 0.61 |
5/8" | 16 | 18,100 | 8.2 | 2.57 | 4.00 | 1.42 | 0.75 |
3/4" | 20 | 28,000 | 12.7 | 4.38 | 4.72 | 1.73 | 0.91 |
7/8" | 22 | 34,000 | 15.4 | 6.78 | 6.00 | 1.93 | 0.96 |
1" | 26 | 47,700 | 21.6 | 11.59 | 6.39 | 2.30 | 1.24 |
1-1/4" | 32 | 72,300 | 32.8 | 20.79 | 7.64 | 2.66 | 1.52 |
Alloy Steel Lifting Chain Connecting Link Key Features & Benefits
· Precision Die-Forged Alloy Steel
Quenched and tempered heat-treated structural alloy steel delivers immense structural load elasticity, enhanced yield limits, and exceptional fatigue resistance under continuous stress.
· Fail-Safe Hammerlock Design
Equipped with a heavy-duty continuous load pin and a mechanical helical spring-locking sleeve. Once driven into the central shaft slot using a hammer, it provides an unyielding mechanical interlock that will not slip or open under vibrating crane operations.
· Overhead Lifting Certified
Engineered strictly to withstand violent dynamic pulling forces. Fully compliant with international rigging standards including EN1677-1, ASME B30.26, and OSHA regulations for safe industrial hoisting operations.
· High-Visibility Cured Powder Armor
Finished with an electrostatically applied thermosetting powder paint (available in Safety Yellow, Brilliant Red, or Safety Orange). This dense barrier blocks outdoor moisture, road salt formulas, and industrial dust abrasion.
Alloy Steel Lifting Chain Connecting Link Factory Advantages
· 100% Certified Proof Load Testing
Every single manufacturing series undergoes non-destructive 2.5 times the Working Load Limit (WLL) proof testing. Material heat codes, size specs, and G80 grade indicators are embossed permanently onto each body link for total safety tracking.
· Advanced Scale Industrial Forging
Our modern infrastructure utilizes heavy-tonnage precision die forging systems and calibrated CNC center-pin machining centers to guarantee identical dimension profiles across millions of batches.
· Comprehensive Custom Molding (OEM/ODM)
We serve major global rigging brands by developing custom shapes. Our in-house tool and die mold house can modify dimensions or emboss your custom corporate logo directly into the steel tooling matrices.
· Direct Factory Export Operations
Maximize your wholesale network distribution margins by purchasing directly from our facility floor. We offer tightly nested packing layouts, stable commercial lead times, and comprehensive technical compliance certification logs.
Alloy Steel Lifting Chain Connecting Link Frequently Asked Questions
Q1: What is the main structural purpose of a Hammerlock Connecting Link?
A: A hammerlock connecting link is used to construct chain slings by joining individual lifting chain links directly to bulky master oblong rings or specialized eye hooks. Its smart split-half body profile lets you loop it into existing closed fittings on-site without needing specialized welding machinery.
Q2: How do you safely assemble and disassemble a G80 Coupling Link?
A: To assemble, align the two interlocking halves inside your chain/hook eyes, insert the central locking sleeve into the middle cavity, and drive the load pin completely through using a standard hammer until it snaps flush. To disassemble, use a pin punch tool and hammer to drive the load pin out from the opposite side, allowing the links to separate for component inspection.
Q3: Are these connecting links approved for vertical overhead crane hoisting?
A: Yes. Because they are forged from high-tensile alloy steel and certified through rigid structural stress validations (Grade 80 configuration), these seamless hammerlock links are fully approved for industrial overhead crane lifting, heavy crane sling assemblies, and secure rigging tasks.