YLB-850 Hydraulic Railway Impact Wrench | QL Railway Machinery

YLB-850 Hydraulic Railway Impact Wrench

The YLB-850 is a hydraulic sleeper bolt wrench designed for rail maintenance and construction teams requiring reliable, high-precision fastening. Unlike pneumatic or electric impact tools, it delivers static hydraulic torque-eliminating shock loads that can damage rail components.

It provides adjustable tightening torque from 80 to 350 N·m with ≤5% deviation, meeting EN 13146-4 standards for rail fastening consistency. The dual-socket system (214 mm / 234 mm spacing) and 850 N·m reverse torque enable efficient loosening of corroded M22–M27 bolts-common in aging freight lines and tunnel sections.

Weighing 90 kg and equipped with electronic reversing, LED lighting, and overload protection, the YLB-850 reduces operator fatigue and increases daily output by up to 40% compared to manual wrenches.

Technical Specifications

Parameter	Value
Model	YLB-850
Engine Power	6 HP (3500–3600 rpm)
Fuel Consumption	230 g/hp·h
Tightening Torque Range	80–350 N·m (≤5% accuracy)
Loosening Torque	≥750 N·m (Peak 850 N·m)
Socket Speed	≥120 rpm
Socket Quantity	2 pcs (Dual-head system)
Socket Center Distance	214±0.5 mm / 234±0.5 mm
Lifting Stroke	≥80 mm
Reversing System	Electronically Controlled Commutation
Insulation Resistance	＞5 MΩ
Dimensions (L×W×H)	1260 × 540 × 915 mm
Weight	90 kg
Compatible Bolt Size	M22 – M27

Performance & Functional Advantages

1. Hydraulic Torque Control
The system automatically shifts from high-speed engagement (≥120 rpm) to high-torque mode when bolt resistance increases-protecting threads while maintaining efficiency.

2. Dual-Socket Design
Two synchronized sockets match standard sleeper bolt spacings (214 mm or 234 mm). Operators can fasten adjacent bolts without repositioning-reducing cycle time by ~35% in switch zones.

3. Ergonomic & Safe Operation
Features include: LED work lights for night shifts, torque overload cutoff, ±15 mm self-aligning sockets, and a digital torque display (±1 N·m accuracy).

YLB-850 hydraulic wrench operating in a railway tunnel at night

Close-up of dual-socket system on YLB-850 aligning with rail sleeper bolts

Rail technician using YLB-850 during track maintenance with LED lights on

Railway Applications & Use Cases

✅ High-Speed Rail Construction – Install M24 bolts with torque consistency compliant with EN 13146.
✅ Subway Tunnel Maintenance – Compact size and lighting allow safe use in confined, dark environments.
✅ Switch & Crossing Areas – Handles both 214 mm and 234 mm bolt patterns without tool change.
✅ Heavy-Haul Freight Lines – 850 N·m reverse torque removes severely corroded fasteners without thread stripping.
✅ Emergency Track Repairs – Ready to operate in under 60 seconds after setup.

Why Choose YLB-850?

QL Railway Machinery has supplied rail fastening equipment to contractors in Europe, the Middle East, and Southeast Asia since 2010. The YLB-850 is built for durability in harsh conditions and supports customization: