EK CHAINS 520 HEAVY DUTY 120L HIGH PERFORMANCE RACE CHAIN

CHAIN SPECIFICATIONS

Pin Length (mm): 17.50
Pin Diameter (mm): 5.24
Roller Diameter (mm): 10.16
Inner Plate Thickness (mm): 2.0
Outer Plate Thickness (mm): 2.0
Tensile LBS/FT: 8,900
Wear Life Index (Standard as 100): 400
Weight 100 Links (kg): 1.52
Seal Type: N/A
Max CC Street: 250cc
Max CC Off-Road: 500cc (4T)
Standard Connecting Link: SPJ
Optional Connecting Link: MLJ

KEY FEATURES OF EK CHAINS

1. ANALYTIC TECHNOLOGY

• State-of-the-art advanced computer technology enables EK to reduce the overall weight by 3% without compromising tensile strength, which in turn extends the life of the chain
• Industry leading machining process of all metal surfaces helps create an unmatched and optimal seal of all EK O-Ring and X-Ring chains
• Additionally mud and dirt build-up is significantly reduced via this technology

2. HEAT TREATMENT

• All EK off-road race chains utilise EK’s exclusive CRH pin treatment process, which provides an extremely hard outside coating and softer inside to increase strength and reduce wear
• Superior impact and shock absorption, and reduced oxidation is also a result of EK’s Chromium Carbide pin surface coating

3. MATERIAL ANALYSIS

4. SEAL-RING TECHNIQUE

O-Ring - EK O-Ring chain has excellent performance at a great price. EK Chain was at the forefront of Sealed chain development and manufacture in the early 70’s, first used as genuine chain on the Kawasaki Z1. O’ring used for SRO Series.

QX-Ring - QX-Ring is a Slim Profile chain with 40% less friction than a normal O-ring chain and 150% better endurance. Used for SRX2 series, 420SRX and 428ZVX.

NX-Ring - NX-Ring is 15% more durable than QX-Ring. The NX-Ring chain has improved tensile strength & increased weight saving. Used for ZVX3 Series.

SX-Ring - SX-Ring is EK’s slimmest profile X-Ring. High tensile strength and increased durability. Used for 520 RXO/SM Series.

5. JOINING LINKS

RIVET TYPE - MLJ

- EK’s most dependable connecting link
- More commonly used on street applications
- Requires special riveting tool to install

CLIP TYPE - SPJ Slip Fit
- Easy to install, can be installed with standard pliers
- Comes standard with some non-sealed chains

CLIP TYPE - SKJ Semi-Press Fit
- Easy to install, can be installed with standard pliers
- Re-designed link plate requires additional pressure to push onto the connecting pins but offers increased dependability and a tighter fit
- Comes standard with motocross, off-road and drag racing chains

SCREW TYPE - SLJ 
- Dependable alternative and easy to install
- Patented mechanism allows easy installation with wrench and pliers
-Available only as option for selected sealed chains