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 Sheet Metal Fabrication Metal Processing Machinery 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!

Name	Custom Sheet Metal Fabrication Metal Processing Machinery Parts
Material	1) Aluminum: AL 6061-T6, 6063, 7075-T etc.
	2) Stainless steel: 303, 304, 316L, 17-4(SUS630) etc.
	3) Steel: 4140, Q235, Q345B, 20#, 45# etc.
	4) Titanium: TA1, TA2/GR2, TA4/GR5, TC4, TC18 etc.
	5) Brass: C36000 (HPb62), C37700 (HPb59), C26800 (H68), C22000(H90) etc.
	6) Copper, Bronze, Magnesium alloy, Delrin, POM, Acrylic, PC, etc.
Surface Treatment	Galvanized (zinc-plated, nickel-plated, chrome-plated, silver-plated), powder coating/oil painting, polishing (mirror polishing, electrolytic polishing),brushing, sand blasting, hot-dip galvanized.
Processing Craft	Engineer drawings-CNC Machining-CNC Turning-Grinding-Inspection-Package
Tolerance	+/-0.01mm or special requirements
Package	PE Bag, Paper carton box, plywood case/pallet/crate
Application	Auto parts, electronic products, power supply, industry cabinet, construction etc
Quality Control	ISO9001/ROHS/SGS
Drawing File Format	Solid works, Pro/E, Auto CAD, PDF
Features	Customized Design Sample Order Accepted Short Delivery time Competitive Prices Long time quality Insurance Professional after-sale services
Inspection	1.Foundry in-house: 100% inspection on critical dimension; 100% on appearance. 2.Third Party inspection available upon requirement
Mainly Testing Facility	Three-dimensional measuring instrument(CMM),Salt spray test box,Dynamic balance detector, Pneumatic detection
Application	Medical,auto parts,Used widely

Programming
According to the customer’s drawings, the engineer will create three-dimensional graphics, edit the programs required by CNC, and import them into the device computer.

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.