High Strength Blackening Finish Rust Prevention Half Metric Thread Hex Head Bolt Fastener
Black oxide surface treatment of high-strength bolts is a common method of chemical treatment. The surface of steel parts is blackened, and some are also called blue.The principle is to form an oxide film on the surface of the metal to isolate the air and achieve the purpose of rust prevention. When the appearance requirements are not high, black oxide surface treatment can be used.
1. Item name:Blackening hex head bolt
2. Standard: DIN931, ISO 4014
3. Grade:,8.8,10.9,12.9
4. Head type: Hex Head
5. Size: M5-M64
6. Material: Carbon Steel
7. Finish: Blackening
8. Delivery time: 8-30 days
9. Package: cartons / plywood cases / pallets
10. Shipment: By sea or By air
11. Loading port: Normal China port
| Q1: What is your main products? |
| A1: Our main products are fasteners: bolts, screws, nuts, washers, anchors and rivets. |
|
| Q2: How to ensure that every process's quality? |
A2: Every process will be checked by our quality inspection department which insures every product's
quality. In the production of products, we will personally go to the factory to check the quality of
products.
|
|
| Q3: Do you offer free samples for checking the quality? |
| A3: Yes, the universal size are available for samples, but freight has to be paid by buyers. |
|
| Q4:Can you customize the products according to samples or drawing design? |
| A4:Yes. we have professional engineers to support the customized products for our customers. We can produce by your samples or technical drawings and build the molds and fixtures. |
|
| Q5: What is your payment method? |
| A5: 30% value of T/T in advance and other 70% balance before delivery. |
| For small order less than 3000USD, would suggest you pay 100% in advance to reduce the bank charges. |
