WJK Rail Clamp (Welding Type Rail Clip)
WJK rail clamp, also known as a welding type rail clip, is a standard fixture used for fixing crane rails onto steel beams. The clamp consists of a top cover, base, adjusting pin, bolt, and nut set. It is welded to a pre-embedded steel plate, providing a strong and reliable connection for industrial crane tracks and heavy-duty rail systems.
WJK series covers models TG38 / TG43 / TG50 / TG60 / QU70 / QU80 / QU100 / QU120, suitable for light, heavy, and crane rails. Materials include ductile cast iron and cast steel, with bolt grades from 4.8 to 8.8, ensuring durability and load-bearing performance in high-stress environments.
WJK rail clamp Components
The WJK Welded Rail Clamp features a robust and simple two-part design, ensuring reliable and long-lasting performance. The complete set includes all necessary components for a secure installation.
The WJK Rail Clamp set includes:
- Cast Steel Base Plate
- Cast Steel Top Cover
- Adjustment Plate (Pin)
- T-Bolt, Nut, Washers(Spring & Flat Washer)
Note on Installation: The system requires the base plate to be welded onto asteel plate on your support structure (e.g., steel beam). We can provide technical guidance to ensure a correct and secure installation.
WJK Rail Clamp Types & Dimensions
The WJK welded rail clamp features a simple yet durable structure, consisting of a top cover, base plate, adjustment pin, and fastening bolt set.
The following diagram illustrates the clamp’s layout in cross-section and top view, showing how each component works together to secure the rail.
The dimension table provides detailed specifications for different rail types, ensuring proper selection and installation accuracy.
| WJK Rail Clamp Type (Rail Type) | Rail Height H (mm) | Bolt Dia. d (mm) | Bolt Proj. h (mm) | Bolt C–C Dist. A (mm) | Min. Flange W. B (mm) | Clamp Width b (mm) | Weight (kg) |
|---|---|---|---|---|---|---|---|
TG38 (38 kg/m) | 134 | 20 | 81 | 194 | 328 | 76 | 1.83 |
| TG43 (43 kg/m) | 140 | 20 | 81 | 194 | 328 | 76 | 1.95 |
| TG50( 50 kg/m) | 152 | 20 | 81 | 212 | 346 | 76 | 1.95 |
| TG60 (60 kg/m) | 176 | 20 | 81 | 230 | 364 | 76 | 1.93 |
| TG75 (75 kg/m) | 192 | 20 | 81 | 230 | 364 | 76 | 1.93 |
| WJK QU70 | 120 | 20 | 81 | 200 | 334 | 76 | 1.95 |
| WJK QU80 | 130 | 20 | 81 | 210 | 344 | 76 | 1.97 |
| WJK QU100 | 150 | 20 | 81 | 230 | 364 | 76 | 1.93 |
| WJK QU120 | 170 | 20 | 81 | 250 | 384 | 76 | 1.93 |
WJK Rail clamps Family Introduction
Glory Track offers three types of WJK welding rail clamps designed for different crane rail applications — standard, compact, and reinforced.
Standard Type — WJK
The standard WJK rail clamp is the most widely used model in China for fixing rails on steel crane beams.
Material: Q235 (Bolt Grade C) or Q345 (Bolt Grade 8.8)
Max lateral load: 45–55 kN per wheel load point
Installation height: up to 81 mm
This type is suitable for general crane runways and industrial tracks.
Compact Type — SWJK
The compact WJK (SWJK) is designed for installations with limited height.
Material: Q345
Bolt: Grade 8.8 high-strength
Max lateral load: 40 kN
Installation height: 71 mm
Ideal for low-profile crane systems or where the top clearance is restricted.
Reinforced Type — HWJK
The reinforced HWJK clamp is used with elastic composite rubber pads under the rail base to reduce vibration.
Types: Standard reinforced (81 mm) / Compact reinforced (71 mm)
Material: Q235 or Q345
Bolt Grade: C / 8.8
Max lateral load: 40–45 kN
Recommended for cranes with a lifting capacity over 30 tons and heavy-duty working cycles.
Installation of WJK Rail Clamp
Proper installation is key to achieving the designed performance.
Step-by-Step Procedure:
- Preparation: Ensure the support structure has pre-embedded steel plates.
- Welding: Weld the base plate onto the pre-embedded plate with three-sided fillet welds.
- Positioning: Place the steel rail into the fixed base plates.
- Assembly: Follow the sequence: Insert Bolt → Adjustment Plate → Top Cover → Flat Washer → Spring Washer → Nut.
- Spacing: Install pairs of clamps on both sides of the rail at intervals of 500-600mm.
- Final Tightening: Tighten the T-bolt until the spring washer is fully compressed. Ensure the rail joint height difference is within 2mm.
Tightening torque Q ≤275t(150N.m)
Tightening torque 220N.m for heavy duty crane.
Why Partner with Glory Track?
① Focus & Expertise
We specialize in manufacturing industrial track fixing systems.
② Quality Assurance
All products are manufactured to strict industry standards.
③ Global Support
We export worldwide and provide professional technical support.
FAQ— WJK Rail Clamp
Can WJK clamps be used on concrete beams?
→ Yes, but it requires pre-embedding steel plates with anchor bolts into the concrete at the designated positions to weld the clamps onto.
What is the difference between WJK, SWJK,HWJK rail clamps?
- WJK is the standard welded rail clamp, widely used for securing crane rails to steel beams.
- SWJK is a compact version designed for installations with height limitations (maximum mounting height 71 mm).
- HWJK features a thickened base, ideal for rail systems with an elastic composite rubber pad under the rail.
Which material option should I choose?
→ For most standard applications, the Q235 material with 8.8 grade bolts is recommended for its higher safety margin and durability.
Do you offer custom packaging or labeling?
→ Yes, we can provide custom packaging and branding for large-volume orders. Please contact us for details.
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