A steel ladder with cage is a fixed climb wrapped in a guard cage. The cage ladder specifications start with one decision: the material. Pick the right grade, and the climb passes audit and outlasts the building. Pick wrong, and corrosion or a failed load test stops the job. These steel ladder with cage materials and numbers come off our shop drawings at an 8,000 m² factory in Shijiazhuang, an ISO 9001:2015 plant shipping factory-direct to 50+ countries.
No trader markup. No rounded-off guesses. Every value below ties back to a material certificate, weld report, and load-test record.
1. Steel Ladder with Cage Materials: Q235B vs SS304
Five materials cover almost every steel ladder with cage we build. The galvanized vs stainless cage ladder question is the one buyers ask first.
- Q235B carbon steel — the workhorse, hot-dip galvanized for outdoor duty. Yield strength 235 MPa. Strong and affordable for most dry or sheltered sites.
- SS304 stainless — the stainless steel cage ladder choice for coastal air, food plants, and washdown areas. It resists rust with no coating.
- SS316 stainless — adds molybdenum for chloride and marine exposure. Chemical plants specify it.
- Aluminum cage ladder — light and naturally corrosion-resistant, good where weight matters. Lower load rating than steel.
- FRP cage ladder — non-conductive, chemical-resistant fibreglass for electrical or highly corrosive zones.
| Material | Relative Cost | Corrosion Resistance | Load Capacity | Best Environment |
|---|---|---|---|---|
| Q235B (HDG) | $ | Good (coated) | High | General outdoor, industrial |
| SS304 | $$$ | Very good | High | Coastal, food, washdown |
| SS316 | $$$$ | Excellent | High | Marine, chemical, chloride |
| Aluminum | $$ | Good | Medium | Weight-sensitive, indoor/outdoor |
| FRP | $$$ | Excellent | Medium | Electrical, corrosive process |
In our workshop we cut Q235B for roughly, and keep stainless or FRP for corrosive duty. Every batch is mill-certified, with the heat number traceable to the coil. New to the type? Our guide to cage ladders covers the basics first.
2. Core Specifications: Dimensions, Load and Coatings
A steel ladder with cage is a fixed ladder plus a guard cage. Both parts carry their own numbers. A vertical cage ladder follows the rung geometry below.
- Rung diameter: 20–30 mm round or square bar, slip-resistant.
- Rung spacing: 250–300 mm centre-to-centre, uniform top to bottom.
- Rung load: 1.5 kN concentrated point load, no permanent set (EN ISO 14122-4).
- Cage hoop pitch: 1,200–1,500 mm vertical, tied by vertical straps.
- Cage inside reach: about 700 mm, keeping the climber within the hoops.
- HDG coating: zinc, inside the EN ISO 1461 band of about 70–85 µm for this section.
Coating thickness decides outdoor life. We read it with a magnetic gauge at several points, then log every reading. For tall climbs that need a rail instead of a cage, see our ladder safety cage system.
3. Standards-Driven Spec Requirements
Cage geometry and materials follow three codes. They line up closely on the key numbers.
- OSHA 1910.23 (US): rungs hold at least 250 lb (~1.1 kN); spacing ≤305 mm. New ladders over 24 ft need a ladder safety system, not a cage.
- EN ISO 14122-4 (EU): 1.5 kN rung load; cage hoops and guard geometry defined for fall protection.
- BS 4211 (UK): permanently fixed ladder and cage requirements for safe access.
Read the rules before steel is cut. Our OSHA cage ladder requirements breakdown explains the 24 ft rule in plain terms.
4. Choosing Cage Material by Environment
Material follows the site, not the budget alone. Here is how we usually call it.
- Coastal or salt air: a stainless steel cage ladder in SS304, or SS316 if spray is constant. Galvanized carbon steel rusts fast at the shoreline.
- Chemical or process plants: SS316 or an FRP cage ladder, depending on the agent and current risk.
- Dry indoor or general industrial: galvanized Q235B carries the load at the lowest cost.
- Weight-sensitive or rooftop retrofit: an aluminum cage ladder eases the dead load.
In our factory, we usually steer first-time buyers toward galvanized Q235B for sheltered sites, then up to a stainless steel cage ladder only where the air demands it. Over-specifying wastes money. Under-specifying fails the next inspection. See real numbers in our cage ladder cost guide, or check fit during installation.
5. Factory Specs and Documentation
Specifications mean nothing without proof. Every steel ladder with cage ships with a document pack.
- Material certificates: mill certs with heat numbers, tying each grade to its coil.
- Weld reports: weld maps and welder qualification records.
- Load-test data: rung and cage proof-load results.
- Coating logs: HDG thickness readings against EN ISO 1461.
We pull a sample from each production batch and run a tensile and rung-load test before the lot ships. Anything that misses spec is scrapped, not shipped. Third-party checks by SGS, TÜV, or Bureau Veritas are available on request, and we welcome factory audits.
Cage Ladder Specifications Quick-Reference
One sheet, the core cage ladder specifications in a single view. Pin it to the drawing.
| Parameter | Typical Specification | Standard / Note |
|---|---|---|
| Material | Q235B / SS304 / SS316 / Aluminum / FRP | Mill-certified, heat-traceable |
| Rung load (EU) | 1.5 kN point load | EN ISO 14122-4 |
| Rung load (US) | 250 lb (~1.1 kN) | OSHA 1910.23 |
| Rung spacing | 250–300 mm | ≤305 mm (OSHA) |
| Rung diameter | 20–30 mm | Slip-resistant |
| Cage hoop pitch | 1,200–1,500 mm | EN ISO 14122-4 |
| Cage inside reach | ~700 mm | Climber within hoops |
| HDG coating | µm (70–85 typical) | EN ISO 1461 |
| 24 ft rule (US) | Safety system, not cage | OSHA 1910.23 (new ladders) |
One project to anchor the numbers. A client in ordered SS304 cage ladders for tank access. They needed EN ISO 14122-4 sign-off and SGS-witnessed load tests. We supplied the full pack — material certs, weld maps, coating logs, test reports — and the batch cleared the audit.
That is why the cage ladder specifications come first, before steel is cut: the paperwork has to match the part. Factory-direct, no middleman. Send your height, material, and local code, and our engineers return a drawing, load rating, coating spec, and quote. Start with our caged fixed access ladder or roof access ladder with cage, then talk to our team.
