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Description
ASA RS- HTS
Pulley with integrated hydraulic
Torsion vibration damper
The new RS-HTS, introduced in Q4/2025, replaces our K05/K07 radial centrifugal clutches, which have proven themselves for decades. When disengaged, the RS-HTS establishes a permanent power connection – while still damping rotational irregularities, especially in the near-idle range. The result: smooth operation in an ultra-compact design.
What makes it better
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Quiet operation: Smooth power flow, no gearbox rattle in the near-idle range.
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Effective damping: Integrated hydraulic torsion vibration damper filters torque fluctuations and reliably prevents gear backlash noise in the compressor.
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Ultra-compact: Pulleys are possible from an outer diameter of 80 mm – ideal for tight installation spaces.
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Permanent power transmission: No disengagement at low speed – the torque transmission remains.
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Lightweight & low inertia: Intelligent lightweight construction made of steel and aluminum – minimized inertia (rotatory and translational ) , fast start-up dynamics, low weight.
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Simple service: Should increased noise levels occur after long operating times, simply replace 2 O-rings , 4 silicone dampers and some special oil with our affordable maintenance package – that's it.
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Standard with 8 PK grooves => suitable for most vehicles with 6/7/8 PK poly - V belt drive
Technical specifications
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Design: Pulley with integrated HTS (hydraulic torsion) Vibration damper).
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Pulley profile: 8 ribs (PK profile).
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Axial position adjustable in 0.1mm increments via shims
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Diameter: 80–160 mm available in 20 mm increments .
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Material: High-strength aluminum, corrosion-protected.
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Operation: Permanently coupled, torsionally damped.
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Damping fluid: ASA special oil 2B57
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Weight: Diameter 80mm approx. 250 grams ready for use
maintenance
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Interval: Every 3 years, or 50,000 km, or when noise levels increase.
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Scope of maintenance package (P 480 12 34): 2 O-rings, syringe with hose and filled with special oil (ASA 2B57), 2 x sealing screws .
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Duration: A few minutes.
Availability & Compatibility
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Available now in combination with the T6.
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Variants: 8 PK Ø 80 / 100 / 120 / 140 / 160 mm (special versions available on request).