Type IV Fasteners System

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The Type IV elastic clip fastener is a boltless fastener suitable for theⅢb-type shoulderless concrete sleeper in ballasted tracks.The type IV spring clip fastener system is suitable for the laying of 60kg/m rails on high-speed railways, including:High-speed railway with a 350km/h speed rating with a mobile unit (maximum axle weight 170kN);The 250km/h speed grade high-speed railway with the mobile unit (maximum axle weight 170kN) can take into account a small number of ordinary passenger vehicles (the maximum axle weight of the locomotive is 230kN) and a small number of trucks (the maximum axle weight is 230kN).

 

Number of parts fpr each set of rail clip IV fasteners system

Rail Fasteners	Rail Clip	Rail shoulder	Rail insulator	Rail Pad
photo
Type	G4/JA/JB spring Clip	Rail Shoulder TZ4	G4/G4J Rail insulator	RPQ Rail pad
Qty(pcs)	2	2	2	1
Material	60Si2MNA	QT450-10	PA66	Naturail or synthetic rubber
Mass or volume	1.60kg/1.26kg/1.28kg	2.80kg	107.3m³/91.4m³	250m³
Remark	used in general areas/rail joints		used in general areas	used at rail joints

Rail spring clip

 

The elastic clips are classified into three types: C4, JA, and JB.

 

• C4-type clips (20 mm in diameter) are installed in standard sections

 

• JA and JB-type clips (18 mm in diameter) are used at rail joints.

JA-type clips (gray anti-rust coating) pair with joint insulated gauge blocks No.7, 8, & 9.
JB-type clips (black anti-rust coating) pair with blocks No.10, 11, 12, & 13.

 

This ensures proper matching of clip types, coatings, and gauge blocks for optimal performance.

Rail insulator

 

Insulated gauge blocks are divided into two types:

 

• G4 gauge blocks for standard sections
• G4J gauge blocks for rail joints
•  

Each type has seven specifications: No.7, 8, 9, 10, 11, 12, and 13. For standard gauge, No.9 and No.11 blocks are used.

Except for joint gauge blocks No.7, 8, and 9 (non-black), all other gauge blocks are black.

 

Longitudinal Rail Resistance

The longitudinal resistance of the rail for each set of fasteners (using C4-type elastic clips) is greater than 9 kN.

Joint Stiffness

Static stiffness of the rubber padding plate: 60 kN/mm (±10 kN/mm).
Static stiffness of the fastener joint: 75 kN/mm (-5 to +35 kN/mm).
The ratio of dynamic to static stiffness is no more than 2.0.

Fatigue Performance

When the fasteners are tested in accordance with EN 13146-4, all components remain undamaged after 3 million cycles of load, and the gauge expansion is less than 6 mm.

Insulation Resistance

When the fasteners are tested in accordance with EN 13146-5, the insulation resistance between the two rails is greater than 3 Ω·km, meeting the insulation resistance requirements of the track circuit.

Pull-out Force of Embedded Iron Seat

The pull-out force of the embedded iron seat is not less than 60 kN. During the pull-out test, no visible cracks appear around the embedded iron seat.

Influence of Harsh Environmental Conditions

After the fasteners undergo the 300-hour salt spray test specified in EN 13146-6, they can be smoothly disassembled using manual disassembly tools.

As with type III elastic clip fastener system is a boltless fastener system and is an elastic non-detachable fastener without concrete shoulders. It has the advantages of less parts, compact structure, high buckle pressure, strong track gauge capability, low maintenance workload, etc. It is especially suitable for railway line with large-scale mechanical operation. Its main structural features are as follows:

a) Pre-embedded iron plates are embedded in the concrete sleepers. The elastic clips are pressed into steel rails by inserting embedded iron seats without bolts.

b) An insulated gauge block is installed between the embedded iron seat shoulder and the rail to adjust the gauge and to perform insulation. The rail left and right positions can be adjusted by replacing different numbers of insulated gauge blocks.

c) Rubber cushions between the rails and the concrete track sleepers provide insulation cushioning and damping.

d) The fastener system is used in conjunction with prestressed concrete rail sleepers without shoulder. The elastic clip type of IV fastener structure can be installed on the original type IIIb prestressed concrete sleeper.

 

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GNEE RAIL was founded in 2008. With many years of international trade experience, we are able to provide customers with professional product selection advice and customized services. All products strictly implement the ISO quality management system and are certified by third-party testing agencies. We pay special attention to after-sales service and have established a rapid response mechanism to ensure timely resolution of customer problems.

At present, our products have been exported to more than 30 countries and regions and are widely used in railway construction projects along the "Belt and Road". GNEE RAIL has a professional import and export team and a complete logistics system to ensure that products are delivered on time. We look forward to establishing long-term cooperative relationships with global customers and jointly promoting the development of the railway industry.

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