Can blind holes be threaded?

Yes. Blind tapped holes are commonly used for concealed fasteners. Bottoming taps are ideal for maximizing thread engagement without break-through.

How deep should a blind hole be?

Typically 3–4× the hole diameter. For threaded blind holes, allow additional unthreaded space at the base.

What’s the tolerance range?

±0.05 mm for diameter and ±0.1 mm for depth is common in CNC precision machining.

What do buyers need to provide when requesting a quote?

Buyers should provide hole diameter, total depth, thread specs, CAD files (2D and STEP), material type, and quantity forecast.

Can bronze rust in coastal environments?

Bronze does not rust like iron, but marine air can accelerate patina formation due to increased moisture and salt exposure.

What causes bronze to turn green?

The green coloration on bronze comes from copper reacting with air, moisture, and carbon dioxide to form copper carbonate, also known as patina.

Is patina a sign of damage?

No. Patina is a natural and often protective layer that forms on bronze, helping shield the underlying material from further corrosion.

How can I keep bronze looking new?

To maintain a clean finish, apply wax or lacquer coatings regularly, avoid acidic or abrasive cleaners, and store or install bronze in dry, well-ventilated environments.

Is bronze or stainless steel better for outdoor fixtures?

Both are durable, but bronze offers an aging aesthetic with protective patina, while stainless steel provides a more consistent, modern appearance. The choice depends on visual goals and environmental exposure.

Can I request bronze parts with pre-applied patina or protective finishes?

Yes. YISHANG offers customizable bronze finishes, including pre-patinated and coated options based on client specifications.

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SHEET METAL FABRICATION CAPABILITIES
Name
*Internal Dimension(HWD)*
General Capabilities
Materials Used	AL1060, AL6061, AL6061, AL5052 Steel, mild steel, SPCC SS201, SS303, SS304, SS316, SS316L Galvanized sheet Special requests
Drawing Format	PRO-E, Auto CAD, Solid Works, UG, CAD / CAM / CAE, PDF
Welding Process	MIG / TIG / Arc / Stick
Fabrication Process	Laser Cutting / Folding / Forming / Punching Welding / Painting / Powder Coating Shearing / Stamping/ Polishing
Surface Finish	Powder coating, bead blasting, anodizing, electroplating, polishing, brushing, painting, screen printing, etc
Logo	Screen printing, laser marking, UV printing
Sheet Metal Products	Brackets / Enclosures / Sheet metal parts / Frames/Cabinets Decorative screen / Stamping parts / Panels / Covers