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| After-sales Service: | Quality Guaranteed |
| Condition: | New |
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Anodized CNC Parts High Precision Aluminum Alloy Parts Multiple Colors Available
Common Screw Issues:
Screw Diameter:
The diameter of a screw generally refers to the thickness of the threaded part. According to manufacturing and national standards, screw diameters have tolerances. For example, 10.5mm, 10.62mm, and 10.75mm all fall under the category of an 11mm screw.
Screw Length:
Countersunk (flat head) screws are measured by their total length, while other types such as hex socket or round head screws are measured by the length of the shank. Screw lengths also have positive and negative tolerances.
Screw Specifications:
For example: M6*58 indicates a screw with a diameter of 6 and a length of 58.
Dimensions of Nuts, Flat Washers, and Retaining Rings:
These are based on the diameter (thickness) of the matching screw.
Q&A on Carbon Steel and Alloy Steel Screws:
What are the performance grades of carbon steel and alloy steel screws?
Answer: Bolt performance grades include 3.6, 4.6, 5.6, 6.8, 8.8, 9.8, 10.9, 12.9, and over ten other grades.
What does the grade represent?
Answer: For example, the definition of a 4.8 grade is:
"4" represents 4*100 = 400MPa, indicating the bolt's tensile strength is 400MPa.
"8" is the yield ratio of 0.8, meaning the nominal yield strength is 400 × 0.8 = 320MPa.
The higher the grade, the better the bolt's performance.
What is pitch?
Answer: Pitch, commonly known as thread spacing, refers to the distance between adjacent threads. It is defined as the axial distance between corresponding points on adjacent threads and is denoted by the code "P."
Definition of high strength?
Answer: Any screw with a grade of 8.8 or higher is considered a high-strength bolt.
How to choose screws of different grades?
Answer: For normal general use, grade 4.8 is sufficient. For mechanical equipment, grade 8.8 or higher is typically chosen. If rust resistance is required, stainless steel should be selected.
| Material | Stainless Steel | SUS201,SUS303,SUS304,SUS316,SUS416,SUS420,17-4PH,SUS440C | |
| Steel | Q235,C20,C45(K1045),1214,1215 | ||
| Copper | C36000(C26800),C37700(HPb59),C38500(HPb58),C27200(CuZn37),C28000(CuZn40/H62),C3604, C51000, C52100, C54400,CuSn8 | ||
| Alumina | AL2024,AL5754(Almg3),AL5083,AL6061,AL6063,AL5052,AL7075 | ||
| Alloy Steel | SCM435,10B21 | ||
| Plastic | PA6,PA66,PP,PC,POM,FR4,ABS,Acrylic | ||
| Machining Processes | CNC 3-axis, 4-axis machining, CNC milling, CNC turning, CNC Lathe High precision 5-Axis turning-milling combined machining, CNC milling and turning, drilling, grinding, stamping, tapping, bending |
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| Finish | Heat treatment, powder coating, electroplating, spraying, painting, polishing, deburring, wire drawing/brushed, anodizing, chrome plating, nickel plating, tin plating, silver plating, gold plating, galvanizing, blackening etc. | ||
| Dimensions | Customized | ||
| Tolerance | ±0.005mm | ||
| Drawing Format | PDF/JPEG/AI/PSD/CAD/Dwg/Step/LGS | ||
| MOQ | Negotiable | ||
| QC Policy | 100% inspection and random inspection before shipment, with QC passed label | ||
| Stardard | Materials and surface treatment comply with RoHS/Reach Directives | ||
| Testing Equipments | CMM, Projector, Pull Tester, Automatic Optical Inspector, Salt Spray Tester, Durometer, Tensile Machine, height gauge, micrometer, plug gauge, thread Gauges, digital caliper and etc. | ||
| Application | Automotives, Optical instrument, medical device, industrial machine, automobile, electric appliance, robot, computers, tele-communication, electronic device, digital communication, UAV, aerospace, bicycle, pneumatic tools, hydraulic and other industries, | ||
| Packaging | PE bags or bubble bags, boxes, cartons, pallet, standard carton or plastic tray, sponge tray, cardboard tray or as per customers' requirements | ||
| Trade Terms | EXW, FOB, CIF, As per customers' request | ||
| Payment Terms | Paypal or Western Union for sample orders; Larger amount by T/T with 30% as deposit,70% before shipment | ||
| Delivery Time | Within 15-20 working days after deposit or payment received | ||
| Shipping Ports | FOB Dongguan, FOB Shenzhen, FOB Hongkong | ||
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