What is a Class 4 office chair gas lift used for?
Class 4 gas lifts are often requested for higher-strength seating programs, export compliance review and branded chair projects where the buyer needs clearer model scope and quality documentation.
Class 4 office chair gas lift for higher-strength chair platforms.
For buyers comparing higher-strength gas cylinders, Samiktech offers Class 4 configurations with QPQ and hard-chrome engineering routes, subject to certificate and model scope.
Class 4 selection
Designed for demanding seating programs.
Class 4 is often requested for projects with stronger load expectations, export-market compliance review, or branded chair programs that need clearer test documentation.
Typical stroke70–270 mm
Pressure tubeØ28 options
Finish routeQPQ / hard chrome
Product detail
Class 4 does not mean one fixed model.
Different chair programs may require different stroke, pressure tube, force and surface-treatment combinations. Samiktech reviews the customer drawing or sample before confirming the production model and certificate match.
- Ø28 × 2.0 mm QPQ configurations
- Ø28 × 2.5 mm hard-chrome configurations
- Private marking and batch traceability
Class 4 specification matrix
Compare the engineering route before requesting samples.
Class 4 programs often require a clearer discussion around pressure tube, surface route and certificate model scope.
| Route | Pressure tube | Stroke range | Force range | Buyer note |
|---|---|---|---|---|
| SC4-QPQ | Ø28 x 2.0 mm QPQ | 70-270 mm | 300-500 N | Common route for black treated Class 4 programs |
| SC4-HC | Ø28 x 2.5 mm hard chrome | 70-270 mm | 300-500 N | Used when the buyer specifies hard-chrome pressure tube |
| SC4-100 | By drawing | 100 mm reference | 350-450 N | Typical office seating quotation starting point |
| SC4-OEM | Project choice | Custom | By test plan | Private marking, packing and destination-market review |
Common model code logic
A clearer way to name Class 4 inquiries.
Example codeSMT-SC4-100-28x2.5-450N-BK
SC4Class 4 chair gas lift platform.
100Nominal stroke in millimetres.
28x2.5Pressure tube specification for engineering review.
450NRated extension force target.
BK / QPQ / HCFinish or surface-treatment route to confirm.
FAQ
Class 4 gas lift questions buyers often ask.
What information is needed for a Class 4 gas lift quotation?
A useful Class 4 inquiry should include stroke, extended length, compressed length, pressure tube route, rod and outer tube requirement, rated force, finish, destination market and expected order quantity.
Does Class 4 always mean one fixed model?
No. Class 4 describes a strength and certification direction, but the actual gas lift model still depends on dimensions, force, surface treatment, chair mechanism compatibility and certificate scope.