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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Custom Aluminum Fabrication Metal Plastic CNC Machining Parts

Yishang provides a variety of CNC machining services including milling, turning,stamping, EDM, wire EDM and surface grinding, for different material on yourneed. With our experienced industry CNC sources, could meet different machining demands in one stop, can manufacture all types of CNC machining parts in both metal and plastic materials.
Whatever you need prototypes or production parts,our CNC machining service will be your best choice. Request your online quote today to get your machining parts doneinasfastas5days!

Item Name	Custom Aluminum Fabrication Metal Plastic CNC Machining Parts
Technology	Laser cutting, CNC lathing, welding, grinding.
Dimensions	Produced according to your drawings.
Material	Can be SPCC, stainless steel or aluminum.
Color	Common is white, black, grey. Can be customzied.
Surface Treatment	Powder coating for SPCC.
Features	High precision, tolerance is only 0.1 mm.
Sample	Welcome to customize metal products and metal parts samples to inspect the quality.
Services	Professional custom metal processing service.

CNC Turning
CNC turning is a CNC process where a cutting tool, a typically non-rotating component of the lathe or turning center, removes material from a rotating rigid material.
This process produces different shapes and sizes depending on the turning operations used.

CNC Machining Center
The operator follows the edited program to accurately adjust the equipment status and process the entire piece of material into the required shape.

Gear Hobbing
Hobbing is a machining process for cutting gear features on both metal and non-metal parts.

The gear teeth (or splines) are progressively cut into a cylindrical piece of material by a series of cuts made by a cutting tool called a hob.

Hobbing allows you to achieve various gear shapes and sizes such as spur gears, worm gears and bevel gears

CNC Milling
It is a computer-controlled process involving using a cutting tool to remove part of a workpiece.

The basic setup involves placing the workpiece on the machine’s table while the cutting tool/s attached to the spindle rotates and moves to shape the workpiece into a finished product.