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Straight Slot Groove | Hex socket | Both sides of the flat | Material | Surface treatment |
LCATY | LCBTY | LCUTY | S45C | Iron oxide Resist film |
LCAS | LCBS | LCUS | SUS303 | / |
Form | L Choice | A | E | M Coarse thread |
F | f1 | W | B | h | h1 | C | W1 | ||
Type | D | Straight Slot Groove | Hex socket,Both sides of the flat | |||||||||||
Straight Slot Groove LCATY LCAS Hex socket LCBTY LCBS Both sides of the flat LCUTY LCUS External hexagonal | 4 | 1 2 3 4 5 6 7 8 | 6 | 2 | 3.5 | 2.6×0.45 | 4 | 0.8 | 0.8 | 2 | 1 | 2 | 0.5 | 5 |
5 | 1 2 3 4 5 6 7 8 10 | 8 | 4 | 3×0.5 | 6 | 1 | 2.5 | 2.5 | 7 | |||||
6 | 2 3 4 5 6 7 8 10 | 10 | 2.5 | 4×0.7 | 8 | 1.2 | 1.2 | 3 | 1.5 | 3 | 8 | |||
8 | 5 6 7 8 9 10 12 20 | 12 | 3 | 4.5 | 5×0.8 | 10 | 1.4 | 4 | 3.5 | 1 | 10 | |||
10 | 5 6 7 8 9 10 12 15 20 | 16 | 4 | 5 | 6×1.0 | 12 | 1.5 | 1.4 | 5 | 1.8 | 4 | 13 | ||
12 | 6 7 8 9 10 12 13 15 20 | 18 | 5 | 8×1.25 | 1.5 | 2 | 14 | |||||||
There are many types of screws, whether they are small screws for glasses or large screws for heavy electrical engineering.The precision of screw is usually 6g (grade 2, American specification "IFI" is 2A), and the raw screw used in construction is 1g.