Class 4.8 8.8 Cross Recessed Flat Black Drywall Screw Carbon Steel
Price:
0.05USD-0.15USD
MOQ:
10pcs
Delivery Time:
15days
Brand:
JIA SHAN
Product Description
Class 4.8 8.8 Cross Recessed Flat Black Drywall Screw Carbon Steel
Product Specifications
| Attribute | Value |
|---|---|
| Name | Metal Screw |
| Standard | DIN, ASME, ANSI, ISO |
| Material | Steel, Stainless steel, Brass, Copper, Titanium Alloy, Plastic |
| Place of Origin | China |
| Finish | Polish, Passivation, Black, Galvanization, Chromate, Dacromet |
| Certificate | ISO9001:2008, ROHS |
| Used | Building Industry Machinery |
| Thread Type | Coarse, Fine |
| Usage | Fastening |
| Function | Connection, Fastening and Decoration |
| Strength | High |
| Size | Various sizes available |
| Measurement System | INCH, Metric system |
Product Description
Carbon Steel Class 4.8 8.8 Black Oxide Cross Recessed Flat Black Drywall Screw
Description
The performance grades of bolts used for steel structure connections range from 3.6 to 12.9, with grade 8.8 and above classified as high-strength bolts made from low-carbon alloy steel or medium carbon steel with heat treatment (quenching, tempering). Grade 4.8 bolts are typically made from 45 steel or Q235-A materials.
The performance grade label consists of two numbers representing the nominal tensile strength value and the yield ratio of the bolt material respectively.
Applications
| Industry | Use Case |
|---|---|
| Automotive | High-strength applications including engines, heavy-duty machinery, and bridge construction |
| Mechanical | Connecting mechanical parts, circuit boards, engines, transmissions, and building structures |
| Energy | Connecting power generation equipment and transmission lines |
| Architectural | Building structures, shipbuilding, and petrochemical equipment |
Materials
| Material | Characteristics |
|---|---|
| Aluminum | Excellent thermal/electrical conductivity but soft; requires proper processing |
| Titanium | Requires EDM machining with deionized water medium |
| Steel | Very strong; generates heat during processing |
| Brass | High tensile strength but requires slow cutting speed |
Feature Advantages
Performance grade 8.8 high-strength bolts achieve:
- Nominal tensile strength of 640MPa grade
- Yield-to-tensile ratio of 0.8
About Us
Frequently Asked Questions
Q: Are you trading company or manufacturer?
A: We are factory and OEM are available.
Q: How long is your delivery time?
A: Generally 7-10 days if in stock, or 15-20 days if not in stock, depending on quantity.
Q: Do you provide samples? Is it free or extra?
A: Yes, we offer free samples but the customer pays for freight.
Q: What are your payment terms?
A: 30% T/T in advance, balance before shipment or L/C.
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Get in Touch
Have questions about our products or want to discuss a custom order? Our team is ready to help you.
Company
Hunan Jia Shan Hardware Tech Co., Ltd.
Location
No.103,104,1st Floor,Building 8 Phase II Factory Building,No.8 Lutian Road,Lugu Base,Lugu Street,Xiangjiang New Area,Hunan Province.Postal Code:410205
Contact Person
Jame Tan