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The Specification of CNC Hex Cap Bolts

August 22, 2023
The specifications of CNC Screw Machined Parts such as hex cap bolts can vary depending on the specific requirements of the customer or application. Here are some commonly used specifications for CNC hex cap bolts:

1. Size: CNC hex cap bolts are available in various sizes, typically measured in diameter and length. The diameter can range from small sizes like M3 (3mm) or #4 to larger sizes like M20 (20mm) or 3/4". The length can vary from a few millimeters to several inches.

2. Thread: CNC hex cap bolts have standard threaded shafts. The most common thread types for hex cap bolts are metric (such as M6, M8, M10, etc.) and imperial/UNC (such as 1/4-20, 5/16-18, 3/8-16, etc.). The thread pitch for metric bolts is typically coarse (e.g., 1.0, 1.25, 1.5) but can also be fine (e.g., 0.75, 1.0).

3. Material: CNC hex cap bolts are manufactured from various materials to suit different applications. Common materials include carbon steel, stainless steel (e.g., AISI 304, AISI 316), alloy steel (e.g., Grade 8), or brass. The material choice depends on factors like desired strength, corrosion resistance, and aesthetics.


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4. Strength Grade: Hex cap bolts often have specified strength grades. This is typically indicated by markings on the bolt head, such as numbers or symbols. For example, common strength grades for carbon steel bolts include 4.8, 8.8, 10.9, and 12.9. Higher numbers represent higher tensile strength and hardness.

5. Coating/Finish: CNC Steel Screw Machined Parts hex cap bolts can be provided with various coatings or finishes to enhance their performance and appearance. Common options include zinc plating (clear or chromate), black oxide coating, hot-dip galvanizing, or organic coatings like powder coating or passivation. These finishes provide corrosion resistance, lubrication, or aesthetic properties.

6. Optional Features: CNC hex cap bolts can also include optional features based on specific requirements, such as a washer face, flange, serrations, or locking features like nylon patch or thread-locking compounds.

It is essential to consult with the customer or follow their specifications to ensure that the CNC hex cap bolts meet their exact requirements. As an OEM service provider, you have the flexibility to customize the specifications based on customer needs, providing them with tailor-made bolts for their application.
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Ms. Mirada Kuo

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