Tension Clamp SKL12 Rail Fastening System For Railroad, W12 Rail Fasteners

The tension clamp SKL is a boltable clip with high permanent clip strength.

This clip is especially applied in rail constructions with concrete sleepers with

the diameter 13mm to 15mm, product range we cover from SKL1, SKL3, SKL12, SKL14

Diameter	Type	Weight (Kg)
13mm	SKL1	0.49
13mm	SKL3	0.53
13mm	SKL12	0.53
13mm	SKL14	0.505

Fatigue property is no less than 5 million times .

Loading property: under pressure 8-12KN, the displacement is between 9-12mm.

Raw Material: 60Si2MnA, 60Si2CrA...

Surface: Self-colour, black, dacromet, and any other suited customers' specific requirements.

Sample Show:

We can also supply you the products according to customers' drawings ang samples completely.

Drawing of SKL12:

Assembly Diagram:

Rail Clip Production Process

How do we produce rail clips?

ZhongYue produces the rail clips according the scientific procedures of rail clip production strictly and the specific procedures are as follow:

1. Raw material: Premium grade spring steel sourced from a reliable and certified long term producer.
2. Shearing: The spring steel bar has to be sheared as per length required.
3. Heating: to forging temperature (950-1000 degrees Celsius), but over heating shall be avoided to check decarburization.
4. Forming: Proper heated bar is transferred to power press for forging.
5. Hardening: The forged rail clips are transferred to quenching tank. Dimensional accuracy and quench hardness of rail clips are checked before tempering.
6. Tempering: The rail clips are tempered at about 350 Celsius to achieve appropriate toughness in the spring.
7. Inspection: The products are then checked thoroughly as per China CRCC and customer required specification and design.
8. Packing: Clips can be packed in woven bags or upon customer requirement.

Inspection during the production process

How is the quality control of ZhongYue rail clips?

We own a full set of strict quality control system to produce rail clips, from raw material purchasing till the finished clip application. There’s a professional inspection team to check about each process of the production line and every two hour out of the line.

Inspection machine for finished rail clips.

What does ZhongYue use to inspect the finished rail clips?

1. Brinell Hardness Tester
2. Carbon and Sulfur Analyzer
3. Rockwell Hardness Machine to test metallic materials
4. Automatic Impact Testing Machine
5. Metallographic Microscope
6. Automatic High-speed Analyzer
7. Fatigue Testing Machine
8. Metallographic Specimen Polishing Machine
9. Metallographic Specimen Pointing Machine

Zhong yue's products ranges:

• Rail Fastening
• Rail Sleeper Screw
• Rail Spike
• Railway Bolt
• Elastic Rail Clip
• Rail Shoulder
• Rail Anchor
• Rail Tie Plate
• Rail Clip
• Railway Washer
• Rail Nylon Insulator
• Rail Pad
• Rail Plastic Sleeve
• Rail Fish Plate
• Brake Block
• Rail Nul
• Rail Fastening System
• Crane rail