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Screw: A general term for fasteners with external threads. They achieve connection by means of thread engagement, generating clamping force.
Specification
|
Item |
Details |
|
Product Name |
Screw |
|
Nominal diameter |
M3, M4, M5, M6, M8, M10, M12, M16, M20 etc |
|
Nominal length |
6mm, 8mm, 10mm, 12mm…200mm |
|
Sample |
Available |
|
Grade |
4.8, 8.8, 10.9, 12.9 etc |
|
Material |
Carbon steel, SS materials |
|
Applicant |
Construction, Machinery, Steel Structure |
Main type of Screw
Common Screw
The most common and widely used type of screw in daily life
Features: Has a cross or a flat head, with threads.
Usage: For fixing furniture, electrical appliances, and small items.
Precision Screw
A type of common screw that is precise
Thread: Fine, uniform, full teeth
Features: The shaft is relatively thin, usually used to screw into metal/plastic parts with pre-existing threads.
Usage: Electrical enclosures, mechanical parts, equipment assembly.
Self-tapping Screw
Can self-cut threads
Features: Wide pitch, pointed tail, high hardness
Principle: When screwed in, it cuts out threads by itself.
Usage: Wood, plastic, thin iron sheet, aluminum alloy.
Expansion Screw
Specifically used for fixing heavy objects on concrete, brick walls, and stone surfaces.
Structure: Screw rod + sleeve + nut
Principle: When tightened, the sleeve expands and tightly clamps the hole.
Usage: Air conditioners, brackets, hanging cabinets, large equipment on walls.
Metric Thread Specification Sheet
|
Specification |
Pitch (mm) |
Drill Hole Diameter (mm) |
Hexagon Head Width Across Flats (mm) |
Load Capacity Reference (kN)* |
|
M3 |
0.5 |
2.5 |
5.5 |
1.8 |
|
M4 |
0.7 |
3.3 |
7 |
3.3 |
|
M5 |
0.8 |
4.2 |
8 |
5.3 |
|
M6 |
1 |
5 |
10 |
7.4 |
|
M8 |
1.25 |
6.8 |
13 |
13.6 |
|
M10 |
1.5 |
8.5 |
16 |
21.6 |
|
M12 |
1.75 |
10.2 |
18 |
31.2 |
|
M16 |
2 |
14 |
24 |
58 |
Self-tapping Screw Specification Sheet
|
Specification |
Thread Outer Diameter (mm) |
Pitch (mm) |
Pilot Hole Diameter (mm) |
Suitable Plate Thickness (mm) |
|
ST2.2 |
2.2 |
0.8 |
1.6–1.8 |
0.5–2.0 |
|
ST2.9 |
2.9 |
1.1 |
2.2–2.4 |
0.8–3.0 |
|
ST3.5 |
3.5 |
1.3 |
2.6–2.8 |
1.0–4.0 |
|
ST4.2 |
4.2 |
1.4 |
3.1–3.3 |
1.5–5.0 |
|
ST4.8 |
4.8 |
1.6 |
3.6–3.8 |
2.0–6.0 |
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