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 Stamping Bending Welding Large Steel Metal Enclosure

A large steel metal enclosure is an important component used to house a wide variety of equipment and machinery. Customized stamping, bending and welding processes are critical to ensure the quality and functionality of the enclosure.

Name	CustomIized Welding Working Stamping Welding part Steel Fabrication
Size	According to the drawings,samples or your requests
Material	Aluminum,stainless steel,carbon steel
Certificate	ISO9001:2015
Drawing format	3D/CAD/DWG//STEP/PDF
Sample	Pay Sample Fee
Advantage	One-stop Solution
Quality Control	Professional Inspection
Service	OEM sheet metal Fabrication Services
Additional	Sample Order and Small Order are acceptable

Steel Metal Enclosure Welding Service
Argon arc welding is used to weld 1.0mmiron , the current is controlledat 80-140A.

Quality inspection requirements:
The welding seam lines are consistent and firm, and the welding surface hasno welding shadow and the position is not deviation.

Polishing:
The surface is smooth enough, no shadows,no holes, no gaps, no seams.
The inner and outer corners are in accordancewith the drawing standards, the straight sideis straight enough, no holes, no gaps(width not exceeding 20mm)

Installation:
Align the threaded holes on both sides of the upper and lower semicircles of the metal enclosure, and then fix them with threads.

Surface Treatment:
1. The color, luminosity, texture are correspondingto the color card that customer has confirmed.
2. The workpiece is not damaged and dropped welding.
3. The surface is not exposed, no black spots,the powder is not heap, no orange peel, nofingerprints.