Description:
12.9 class screws as the top of the screw， with high hardness and tensile strength， Rockwell hardness (HRC) up to between 39 and 44， the tensile strength of up to 1220N / mm2. mainly used to the textile， hydraulic， injection molding and mechanical industry.
Specifications:
Type: flat end
Color:black
Material: Carbon steel
Category: hex socket Fastening screw
Package size:11x6.6x2.3cm
Size(mm):
| Diameter | Inner diameter | Length | Quantity |
| 2 | 1 | 3 | 20 |
| 2 | 1 | 4 | 20 |
| 2 | 1 | 6 | 20 |
| 3 | 2 | 4 | 20 |
| 3 | 2 | 6 | 20 |
| 4 | 3 | 5 | 20 |
| 5 | 4 | 6 | 20 |
| 6 | 4 | 5 | 20 |
| 6 | 4 | 10 | 20 |
| 7.5 | 5 | 8 | 20 |
Features:
Tight structure， great stability
With high hardness and tensile strength
Within the hexagonal bolts 12.9 cyanide blackened surface， it is rust-proof
Operation method :
1. Must be vertical to the spools of thread are screwed， do not tilt;
2.In the screwing process， rotation force must be uniform， tightening
torque can not be more than safe torque;
3.As much as possible using torque wrench or socket wrench， avoid
the use of movable wrench or electric wrench;
4.Avoid use under the condition of high temperature， use don't fast
rotation， avoid rapid temperature rise and cause the lock.
Package included:
200 x Flat Head Hex Socket Screw
