Bus Chair Strut: Selection Guide for Vehicle Seating
Bus Chair Strut: Selection Guide for Vehicle Seating
DK Gas spring provides targeted bus chair strut solutions for vehicle seating systems. This guide focuses on key information for selection，including specifications, types, and selection criteria.
What Are Bus Chair Struts?
A bus chair strut is a specialized gas spring designed for bus/coach seats, supporting adjustment, cushioning, and load-bearing. It uses compressed nitrogen to enable smooth movement and position retention, suitable for seat height, recline, and lumbar support adjustments.
Bus Chair Gas Spring Specifications
Choose models based on seating design requirements:
| MODE | LENGTH | STROKE | CYLINDER DIA | PISTON ROD DIA | MIN FORCE (N) |
|---|---|---|---|---|---|
| KQL001 | 250 | 40 | 22 | 10 | 100N |
| KQL002 | 300 | 70 | 22 | 10 | 150N |
| KQL003 | 350 | 100 | 22 | 10 | 150N |
| KQL004 | 400 | 140 | 22 | 10 | 250N |
| KQL005 | 600 | 240 | 22 | 10 | 100N |
| KQL006 | 800 | 300 | 22 | 10 | 200N |
| KQL007 | 200 | 40 | 27 | 10 | 100N |
| KQL008 | 200 | 40 | 27 | 10 | 200N |
| KQL009 | 280 | 100 | 27 | 10 | 350N |
| KQL010 | 330 | 100 | 27 | 10 | 430N |
| KQL011 | 360 | 140 | 27 | 10 | 350N |
| KQL012 | 400 | 100 | 27 | 10 | 200-900N |
| KQL013 | 500 | 120 | 27 | 10 | 200-900N |
| KQL014 | 600 | 200 | 27 | 10 | 100-500N |
| KQL015 | 800 | 300 | 27 | 10 | 200-900N |
| KQL016 | 900 | 350 | 27 | 10 | 200-1000N |
💡 B2B Sourcing Insight: Managing dozens of individual SKU codes for specialized vehicle seating or body panels can severely tie up your warehouse capital. DK resolves this by offering a highly flexible 10-Piece Per SKU Minimum Order Quantity (MOQ), allowing global distributors to bundle these commercial seat struts with our fast-rotating Automotive Aftermarket Gas Struts in a single Mixed Container Shipment (minimum 500 total pieces).
Clevis Specifications (for Installation)
| Item | Suitable for clevis | d1 h11 | a | b | 11 | 12 | 13 | Mass [kg] 100 pcs |
|---|---|---|---|---|---|---|---|---|
| SP4x8 | G4x8 | 4 | 9.5 | 11 | 19 | 15 | 4.5 | 0.145 |
💡 B2B Engineering Tip: Looking to replace existing Stabilus or gas strut end-fittings? All our heavy-duty automotive lift supports on the Wholesale Automotive Aftermarket Supports catalog can be customized with these identical OE-grade G4x8 clevises or ball studs, ensuring 100% drop-in compatibility for vehicle tailgates and specialty seat adjustments alike.
Key Types for Selection
Locking Gas Springs
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Best for: Fixed-position seats (passenger seats, crew seats).
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Feature: Adjust to desired angle/height and lock securely, preventing movement during transit. Meet automotive safety standards.
Adjustable Gas Springs
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Best for: Frequent-adjustment seats (driver seats, luxury coach seats).
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Feature: Tool-free fine-tuning via lever/button, corrosion-resistant for daily use.
Dampers
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Best for: Vibration-prone routes (rural buses, off-road coaches).
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Feature: Pair with gas struts to reduce noise/vibration, using hydraulic dampers or shock absorbers for smoother rides.
How to Select the Right Strut
1. Load Capacity
Calculate total weight (seat + passenger). Choose from our compression gas springs (50N-2000N) to match load requirements.
2. Stroke Length
- Driver seats: Longer strokes (140-350mm) for wide-angle adjustments.
- Passenger seats: Shorter strokes (40-100mm) for fixed-range use.
3. Environmental Resistance
- Humid interiors: Choose corrosion-resistant coatings.
- Open-air buses: IP-rated seals to withstand weather exposure.
4. Locking Mechanism
For fixed positions, ensure reliable triggers (lever/button/cable) with smooth operation after repeated use.
📋 Cross-Reference & Bulk RFQ Desk
Are you an automotive parts importer or regional distributor looking to refresh your local market catalog? Don't waste hours manually mapping stroke lengths and Newtons. Send your local market SKU lists, Stabilus catalog codes, or Excel OEM manifests directly to our engineering desk. We provide a 100% accurate matching quote with tiered wholesale volume discounts within 12 hours. 👉 Upload Your Bulk OEM / SKU List for a Rapid B2B Quote
Frequently Asked Questions (FAQs)
- What Causes Gas Springs to Malfunction? The entry of dirt and airborne particles can lead to long-term issues. As the piston rod extends, dirt accumulates on it and mixes with the oil and gas during compression.
- What is the Average Lifespan of Your Gas Springs? DK Gas Spring ensures a prolonged lifespan for its locking gas struts. Our gas springs typically come with a 50,000+ Opening/Closing Cycles Warranty.
- How Should Gas Springs Be Maintained? Gas springs require minimal maintenance and do not need oiling or lubrication. They are designed to operate perfectly for many years and are always tailored to meet the specific requirements of their intended applications.
- Where Are Gas Springs Commonly Used? Currently, gas springs are extensively used in automotive interiors to support adjustable seats and tables, on various easy-open panels and hatches, and even in small electronic devices.
- Can Gas Springs Be Used Vertically? Ensure that gas springs are used at an angle no greater than 60 degrees from the vertical when incorporating them into a design. For the final few millimeters of the stroke, our Dynamic Damping Technology utilizes the internal oil to achieve a significant damping effect, ensuring no slamming injuries.
- Do You Offer a Variety of Gas Springs? Absolutely. We have a diverse range of locking gas struts suitable for various applications. Please contact us to learn more about our extensive inventory of gas springs.
🛠️ Shared Engineering Standards: From Commercial Seating to Automotive Aftermarket
At DK Gas Spring, our engineering philosophy is built on absolute cross-compatibility and rigorous testing. The very same IATF 16949 certified production lines and internal valve technologies used to manufacture high-frequency bus chair struts are fully applied to our Wholesale Automotive Aftermarket Lift Supports. Whether we are dampening a luxury coach driver’s seat or supporting a heavy SUV tailgate, the core hydraulic damping mechanisms remain identical—engineered to withstand extreme all-weather environments (-40°C to +80°C) and pass the same 96-Hour Neutral Salt Spray (NSS) corrosion tracking.
Salt Spray Test Report (NSS)
Key Test Parameters
Test Method
Neutral Salt Spray (NSS)
Standard
GB/T 10125-2012
Exposure Time
96 Hours
Temperature
35±2 °C
NaCl Concentration
50±5 g/L
Chamber Environment
- Chamber Temperature35±2 °C
- Saturator Temperature47±2 °C
- Salt Fog Collection Rate1.0 - 2.0 ml/(80cm²·h)
- pH Value of Collected Solution6.5 - 7.2
Sample Preparation
- Sample Angle15° - 25° from vertical
- Cleaning Method Before TestWiped with ethanol
- Cleaning Method After TestRinsed in gently running water (<35°C), dried
- Evaluation StandardGB/T 6461-2002
Pass / Excellent
After 96 hours of Neutral Salt Spray exposure, the tested gas spring samples showed no visible red rust on the main cylinder or piston rod. Minor blistering observed on the end fittings (non-critical area). Protection Rating: 9/10.
Engineering Note
Standard configuration delivers 96-144 Hours NSS. Custom multi-layer QPQ and premium coatings are available to support up to 244+ Hours Salt Spray for heavy-duty manufacturing, marine environments, or industrial machinery applications.
Compliance Declaration
Minor surface blistering on standard zinc-plated non-working end-fittings is within acceptable IATF 16949 parameters and does not affect the pressure containment or mechanical integrity of the cylinder.
Sample Before Test (0h)
Sample After Test (96h)
Close-up: Piston Rod Surface (96h)
SGS RoHS Test Report
Substance Analysis Results
| Substance | Limit | MDL | Result | Status |
|---|---|---|---|---|
| Cadmium (Cd) | 100 mg/kg | 2 mg/kg | ND | Passed |
| Lead (Pb) | 1000 mg/kg | 2 mg/kg | 17 mg/kg | Passed |
| Mercury (Hg) | 1000 mg/kg | 2 mg/kg | ND | Passed |
| Hexavalent Chromium (Cr(VI)) | 1000 mg/kg | 8 mg/kg | ND | Passed |
| Sum of PBBs | 1000 mg/kg | 5 mg/kg | ND | Passed |
| Sum of PBDEs | 1000 mg/kg | 5 mg/kg | ND | Passed |
* ND = Not Detected (lower than MDL). MDL = Method Detection Limit.
Tested Sample
Official Test Sample ID: SHA21-033925.001
Reference Standards
- •IEC 62321-5:2013
- •IEC 62321-7-2:2017
- •IEC 62321-4:2013+AMD1:2017
- •IEC 62321-6:2015
Analytical Instruments
- •ICP-OES (Inductively Coupled Plasma Optical Emission Spectrometry)
- •AAS (Atomic Absorption Spectrometry)
- •UV-Vis (Ultraviolet-Visible Spectroscopy)
- •GC-MS (Gas Chromatography-Mass Spectrometry)
DK Gas spring Advantages for Selection
- Customization: Tailor adjustable/locking gas springs to your stroke, load, and mounting needs.
- Quality Data: 100% tested for pressure resistance/leakage, compliant with IATF 16949.
- Full Range: dampers, pneumatic actuators for complete seating systems.
Ready to select? Use the specifications and criteria above to match your needs, or contact our engineers for personalized recommendations.
DKGasspring: Precision gas struts for reliable vehicle seating.
