Choosing the right stainless steel grade for architectural hardware affects corrosion resistance, appearance, manufacturing cost, welding, polishing, and long-term performance. For custom door handles, Hinges, and related hardware, SUS304 and SUS316 are among the most relevant grades, but the correct choice depends on the actual installation environment and required standards.
Both SUS304 and SUS316 are austenitic stainless steels. The key difference is that 316 contains molybdenum, which improves resistance to localized corrosion, especially in chloride-containing environments. Outokumpu notes that common Cr-Ni-Mo austenitic grades typically contain around 2 to 3 percent molybdenum, with about 17 percent chromium and 10 to 13 percent nickel.
For architectural hardware, this difference matters when products are exposed to humidity, coastal air, or more aggressive environments.
| Grade | Typical Project Use | Main Advantage |
|---|---|---|
| SUS304 | Indoor and general architectural projects | Balanced cost and corrosion resistance |
| SUS316 | Coastal or more corrosive environments | Higher resistance to localized corrosion |
A higher-grade material does not automatically guarantee better product performance. Surface treatment, manufacturing quality, installation environment, and maintenance also matter.
For example, HANGFAT's Stainless Steel U Form EN Standard Lever Handle is available in stainless steel configurations and selected SUS304 versions can reach 480 hours of salt spray testing and 200,000 durability cycles.
This shows why buyers should evaluate the complete product specification rather than only asking whether the hardware is 304 or 316.
A practical project sourcing checklist should consider:
Indoor or outdoor installation
Coastal or high-humidity exposure
Cleaning chemicals
Required corrosion level
Expected service life
Surface finish
Order quantity
Destination market
For standard hotels, offices, residences, and many commercial interiors, SUS304 may provide an efficient balance between performance and cost. For coastal developments or harsher environments, SUS316 may offer additional protection.
HANGFAT also offers selected crank-form lever handles in both SUS304 and SUS316, allowing material specifications to be matched to different projects.
Material selection should be confirmed during the OEM or ODM process, not after tooling is completed.
A typical manufacturing process may involve cutting, forming, CNC machining, laser welding, polishing, surface treatment, assembly, and testing. Changes in material can affect forming behavior, welding parameters, polishing results, production cost, and inspection requirements.
HANGFAT uses laser cutting and laser welding for selected stainless steel handles. Its C-form lever handle range also supports EN 1906 Grade 3 or Grade 4 performance and 200,000-cycle durability.
Direct manufacturer involvement therefore helps evaluate whether the selected stainless steel grade suits both the design and the production process.
For bulk supply, material grade should become a measurable quality checkpoint.
Important controls include:
Material specification verification
Dimensional inspection
Welding quality
Surface consistency
Corrosion testing
Durability testing
Final assembly inspection
Selected HANGFAT special-form handles can achieve EN 1670 Grade 4 with 240-hour testing or Grade 5 with 480-hour testing, together with EN 1906 performance and 2500 N pull testing.
These test values are more useful for project sourcing than broad statements such as high quality stainless steel.
Material selection and compliance should be planned together. EN 1906 covers performance classification for lever handles and door furniture, while EN 1670 addresses corrosion resistance of building hardware.
For export projects, the required performance level should be confirmed before material, finish, structure, and testing plans are finalized.
HANGFAT has manufactured architectural hardware since 1994, provides OEM and ODM support, and reports monthly production capacity of approximately 800,000 pairs or sets. Its development process covers requirement evaluation, drawing confirmation, prototype development, manufacturing optimization, mass production, quality inspection, and export packaging.
Choosing between SUS304 and SUS316 should therefore be based on environment, performance requirements, manufacturing feasibility, and total project cost. A capable custom architectural hardware manufacturer should help translate these factors into a material specification that remains practical from prototype development through repeatable bulk production.
