Definition:
Metal fasteners are components used for connecting, fastening, or assembling metal structures, typically made of metal, used in various engineering and manufacturing applications.
Main Types:
Bolts: Fasteners used for connecting components through threaded engagement.
Nuts: Components that secure onto bolts, fixing them in place and forming a connection.
Screws: Fasteners inserted into another metal component by rotation to create a connection.
Studs: Similar to bolts but typically fixed in one component, with another component secured using a nut.
Washers: Used to distribute pressure on connecting surfaces and provide support.
Pins: Used for positioning and connecting components during assembly.
Main Sizes:
Sizes of metal fasteners vary depending on the type and application. Typically include parameters such as diameter, length, thread size, and pitch.
Finish:
Metal fasteners often have finishes such as bright chrome plating, galvanization, painting, phosphating, anodizing, etc., to enhance corrosion resistance and aesthetics.
Production Standards:
The production of metal fasteners usually adheres to standards like ASTM, ISO, DIN, JIS, and other international standards to ensure quality and performance.
| Producing Standard | ASME | ASME B18.2.1 | Hex Bolts |
| ASME B18.2.2 | Hex Nuts | ||
| ASME B18.22.1 | Plain Washers | ||
| DIN | DIN931 | Hex Bolt with partial thread | |
| DIN933 | Hex Bolt with full thread | ||
| DIN912 | Hex Socket Cap Screw | ||
| DIN934 | Hex Nuts | ||
| DIN125 | Plain Washers | ||
| DIN127 | Spring Washer | ||
| DIN975 | Threaded Rods | ||
| DIN976 | Stud Bolts | ||
| DN3570 | U-Bolt |
Common Materials:
Common materials for metal fasteners include:
Carbon Steel
Stainless Steel
Alloy Steel
Aluminum Alloy
Brass
Titanium Alloy, etc.
| Material Grade | Nickel Alloy Steel | UNS N02200/Ni 200 UNS N02201/Ni201 UNS N04400/Monel 400 UNS N05500/Monel K500 UNS N06600/Inconel 600 UNS N06601/Inconel 601 UNS N06625/Inconel 625 UNS N08825/Incoloy 825 UNS N08800/Incoloy 800 UNS N08810/Incoloy 800H ,UNS N08811/Incoloy 800HT UNS N08020 /Alloy 20 UNS N08031/ Alloy 31 UNS N06002/Hastelloy X UNS N06022/Hastelloy C22 UNS N06200/Hastelloy C2000 UNS N10276/Hastelloy C276 UNS N10665 /Hastelloy B2 UNS N10675/Hastelloy B3 |
|
| Stainless Steel | 304/304L 316/316L 316Ti 317/317L 321 347/347H 310 309 A453 660C 660D S31254 /254SMO 904L/1.4539/N08904 N08367 N08926/1.4529 |
||
| Carbon Steel | Grade 4.8 5.8 6.8 8.8 10.8 12.9 | ||
| Alloy Steel | A193 B7 A194 2H A320 L7/L7M | ||
| Duplex Steel | 2205 /S31803 S32750/2507 S32760 | ||
Main Production Processes:
Material Selection: Choosing suitable metal materials that meet requirements.
Cold Heading: Using a cold heading machine to shape materials into the desired form.
Heat Treatment: Heat treatment to enhance material strength and hardness.
Surface Treatment: Coating processes like plating, painting, phosphating for improved corrosion resistance.
Thread Machining: Creating threads using machining equipment.
Assembly and Packaging: Assembling fasteners into final products and packaging.
Quality Control Requirements:
Strict control of the quality and performance of raw materials.
Regular inspection and testing of key parameters during the production process.
Visual inspection and dimension measurement of final products.
Non-destructive testing (e.g., ultrasonic, magnetic particle) for quality verification.
Compliance with relevant standards and regulations.
Procurement Considerations:
Ensure selection of qualified suppliers meeting specifications and requirements.
Regularly inspect product quality and delivery times.
Establish effective communication channels with suppliers to address issues promptly.
Common Questions and Answers:
Q: What is the most common application of metal fasteners?
A: Metal fasteners are widely used in industries such as mechanical manufacturing, construction, automotive, aerospace, for connecting, fastening, and assembling metal components.
Q: What factors should be considered when choosing metal fasteners?
A: Factors to consider when selecting metal fasteners include material, size, load-bearing capacity, corrosion resistance, and the working conditions in the environment.
Q: How can the quality of metal fasteners be ensured?
A: Quality is ensured through strict control of raw materials, process monitoring, product testing, and adherence to quality management systems compliant with relevant standards and regulations.
