rail fastening system

rail fastening system

  • Size:customization
  • Standard: E-clip, SKL, KPO, Nabla, WJ
  • Surface: plain or as customer requirement
  • Packing: bulk in carton, then on pallet, or according to customers

A rail fastening system,  also known as rail fastening, rail fastener, railway fastening system, it is used to fix rails to railway sleeper or railroad ties, which is usually consisted of rail clipsrail anchors, railroad tie plates, chairs, fasteners, dog spikes, screw spikes, track bolts, etc. The selection of a fastening system must be made with utmost care for rail road safety can’t be compromised.

Types of Rail Fastenings

Various types of fastenings have been developed to meet the requirements of railway development. Namely, there are fastening with rail spike with base plate above the tie, E-clip Fastening, Tension Clamp Fastening, Bolt Clamp Fastening, Tack Joint and Chairs Fastening, and Steel Spring Keyed rail in Chair Fastening, the name of which may vary with locations, and the picture of the various of rail fastening system are shown as follow:

rail spike with base plate above the tie E clip fastening fastclip fastenning tension clamp fastening Bolt clamped fastening Track joint and chairs steel spring keyed rail in chair
Rail spike with base plate above the tie E-Clip' fastening  'fastclip' fastening Tension clamp fastening Bolt clamped fastening Track joint and chairs Steel spring keyed rail in chair

Rail fastening system parts

A resilient rail fastening has its own features, such as, the spring/ rail clip holding the rail to the railroad sleeper, the rail shoulder/ rail anchor holding the clip, an rail insulator and a rail pad separating the steel rail from the railroad sleeper. As for the four features, there are strict criteria stipulated to ensure the fastening effect.

1. Rail clamping force

Rail clip or rail clamp are essentail parts of rail fastening system. Clamping forces may vary with the fastening system and customer requirements. Generally, most fastening systems offer a clamping force per clip between 7.5 to 12.5 kN with deflections of the clips toe between 10 and 15mm. According to European standards, the minimum force to push the rail through the fastening system of 7kN is for most main line tracks and 9 kN for high speed rail and heavy freight lines, which suggests that a nominal clamping force per clip of 8.5kN at minimal for mixed traffic line and 10 kN for the more severe applications.

2. Shoulder/ anchor

The rail shoulder/ rail anchor has a very important role in fastening system. The rail shoulder/ rail anchor has to be able to withstand the impact of loads and vibration transmitted to the sleeper without breaking the sleeper or getting loose. The European standard requires that all the elements of fastening should be capable to withstand a 60kN pullout force with doing no harm to the sleeper.

3. Insulator

Rail insulator in rail fastening system works as a cushion to stop the wearing of other fastening components. And then the insulator must be made of materials resistant to wear, to degrade from ultra violet light and to attack from chemicals. The requirements on insulators vary with the nature of the signaling and electrical systems.

4. Rail pads

The function of rail pads is to spread the load from the rail to the railroad sleeper and to attenuate the loads impact from bad joints, track irregularities and faults in rolling stock. The railroad pad is usually made of rubber, of 10 mm thick, or is a plastic such as EVA between 5 mm and 10 mm thick. The stiffness of the pad is typically in the rang 40-450 kN/mm, and the 5 mm plastic pad can offer stiffness as high up to 6000 kN/mm. Low stiffness railroad pads are not recommended for use in curves sharper than about 400m radius.

E-clip rail fastening system

Technical Parameters for ONE unit of E clip rail fastening system  
e clip fastening system e clip , fandrol on concrete
Item included Quantity Material Size Remark
E clip 2 60Si2MnA, 60Si2CrA Dia. 16mm,18mm or 20mm (E1809, E2006,E2007,E2009,etc Hardness: 44-48HRC
Toe Load: Dia.16mm: 500-700kgf; Dia.18mm:750-900kgf; Dia.20mm:1100-1400kgf
Fatigue life: 5 millions cycles without breaking
Standard: DIN17221, BS970, GB/T1222
Shoulder 2 QT500-7, QT450-10 For UIC54, UIC60, 115RE, BS80lbs, BS100lbs, 50kg rail, 60kg rail, etc. Note: Hardness of E-clip is 44-48HRC; Toe Load for E-clip is 500-700kgf (Dia.16mm); 750-900kgf(Dia.18mm); 1100-1400kgf(Dia.20mm); Fatigue life of E-clip is 5 millions cycles without breaking DIN17221, BS970, GB/T1222 qualified E-clip
Rail pad 1 HDPE, rubber or EVA
Insulator 2 Reinforced Nylon 66 (PA66)

Nabla Clip rail fastening system

Technical Parameters for ONE unit of Nabla Clip rail fastening system
nable clip rail fastening system nable clip rail fastening system concrete


  Nabla clip Insulator Screw spike Spring washer
Pieces required 2 2 2 2
Material 60Si2MnA, 60Si2CrA Reinforced Nylon 66 (PA66) Grade5.6:35# ML08AI
Size 4mm or 4.5mm thick   UIC54,UIC60,50kg rail,60kg rail 18.25x34x78mm
Note 42-47HRC 3 million times without breaking; Application for different rail type Density:1.3-1.45g/cm3 Tensile strength:≥170Mpa Elongation:≤4.4% Bending Strength:≥250Mpa Impact Strength(No gap):≥80KJ/m2 Melting point:250-270℃ Insultion resistance:≥1X108Ω Glass fiber content:30-35% Hardness:≥110HRR Tensile strength:≥500Mpa Yield strength:≥300Mpa Elongation:≥20% Cold bending:90 degree without crack Chemical composition(%): C:0.05-0.10, Mn:0.30-0.60, Si:≤0.1, Cr:≤0.2, P:≤0.035, S:≤0.035

SKL clip rail fastening system

 Technical Parameters for ONE unit of SKL Clip rail fastening system
SKL clip rail fastening system SKL clip rail fastening system concrete
  SKL tension clip Ss35 screw spike Flat washer Plastic dowel Guide plate Rail pad
Pieces required 2 2 2 2 2 1
Material 60Si2CrA, 60Si2CrA, 38Si7 Grade 4.6: Q235; Grade 5.6: 35# Grade 8.8: 45# Q235 HDPE, Reinforced Nylon 66 (PA66) Reinforced Nylon 66 (PA66) EVA, or rubber
Size skl1,skl3,skl12,skl14 M24×150mm Uls7 For different sizes of screw spike UIC54, UIC60, 50kg rail, 60kg rail, and other sizes as ordered  
NOTE Hardness: 42-47HRC 5 millions cycles without breaking. Standard: DIN17221, GB/T1222 Standard: ISO898-1, UIC864-1 and NF F500-50 Standard: EN10025, EN10139 To insert into concrete sleeper Customized products available.

KPO clamp rail fastening system

Technical Parameters for ONE unit of KPO clamp rail fastening system
KPO clamp rail fastening system KPO clamp rail fastening system concrete
  KPO clip Screw spike HS bolt Hex nut Double coil spring washer Base plate
Pieces required 2 2 4 2 2 1
Material Q235 Grade 4.6: Q235 Grade 5.6: 35# Grade 8.8: 45# Grade4.6: Q235 Grade5.6: 35# Grade8.8: 45# Grade 5: 35# Grade 8: 45# 65Mn Casting iron QT500-7, QT450-10, or forging low carbon steel or high carbon steel;
Type; KPO3, KPO6, KPO9 M24×150mm M24 ×160mm M24 ×180mm HS26, HS32 As ordered As ordered UIC54,UIC60, 50kg rail, 60kg rail,S49 in ordered size
NOTE Standard: DIN5906 Standard: ISO898-1, UIC864-1 and NF F500-50 Diameter: 22mm or 24mm. Length: 55mm, 65mm, 75mm, 90mm Standard: DIN985 Standard: UIC864-3 Standard: UIC864-6


1. What is the definition of ONE SET railway fastening system.

Generally ONE SET railway fastening system refers to the unit for one side of a sleeper of a single rail, i.e., 2 sets of fastening systems are needed for a single sleeper of a single rail, and 4 sets needed to fix a sleeper with rails.

2. Do you supply FREE samples of the rail fastening systems?

FREE samples can be supplied but the freight is paid by customer.

3. How is surface treatment for the fasteners?

We provide different coating service as per clients’ requirement: plain (oiled); paint with any color; oxide black; wax; bituminizing; DHG; electroplating zinc and others are available. plain and black oxide are all available.

4. What is the payment term?

We usually accept 30% prepayment, and the balance 70% against B/L copy within 5 working days after B/L date; flexible payment is negotiable.

5. What is the delivery time?

It depends. Delivery time can be as short as 10 days or less when moulds or goods are in stock. Otherwise, it may take 30-40 days to develop new products.

6. How do you guarantee the quality of fastening system?

A: We have passed the certification of CRCC in China and ISO9001:2008 overseas. We also accept third party test from clients.

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