#8 SS Self Tapping Screw CSK Head
ST4.2 (#8) stainless steel self-tapping countersunk screws to ISO 7050 with 80° flush head in A2 grade. Thread-forming fasteners for sheet metal and plastic assembly at ST4.2 gauge.
Specification
#
Standard
ISO 7050 (supersedes DIN 7982); equivalent to DIN EN ISO 7050
Thread
Coarse (standard)
Material
Stainless Steel 304 (A2)
Grade
A2-70
Stock
In stock (304). Grade 316 available against bulk order
Surface Finish
Plain/passivated (standard for stainless steel)
Head Type
Countersunk (flat head), 80-degree included angle
Drive Type
Phillips (H), Pozidriv (Z), Hexalobular/Torx (IRS)
Point Form
Form C (cone/gimlet point) or Form F (flat/blunt end)
Dimension
#
Size (d mm)
Thread Dia (min-max mm)
Pitch
Length (mm)
Thread Length (mm)
ST2.9
2.9-2.9
1.1
13
13
ST3.5
3.5-3.5
1.3
16
16
ST4.2
4.2-4.2
1.4
19
19
ST4.8
4.8-4.8
1.6
22
22
ST5.5
5.5-5.5
1.8
25
25
- All dimensions in mm, tolerance +/- 0.01 mm. Additional dimensions available on request.
Benefits
#
At ST4.2 (#8) gauge, stainless steel countersunk self-tapping screws provide flush, corrosion-resistant fastening in thin-gauge fabrication. The 80° head angle matches standard countersink preparation. A2 stainless steel construction is appropriate for outdoor enclosures, marine fittings, and food processing equipment. Self-tapping thread reduces assembly time by eliminating pre-tapping operations.
Common Applications
#
Typical applications for ST4.2 (#8) gauge stainless steel countersunk self-tapping screws:
- Architectural cladding panels
- Solar panel mounting frames
- Industrial enclosure fabrication
- Food processing equipment covers
- Heavy-gauge sheet metal assembly
Read Me
| Standard | ISO 7050 (supersedes DIN 7982); equivalent to DIN EN ISO 7050 |
| Thread | Coarse (standard) |
| Material | Stainless Steel 304 (A2) |
| Grade | A2-70 |
| Stock | In stock (304). Grade 316 available against bulk order |
| Surface Finish | Plain/passivated (standard for stainless steel) |
| Head Type | Countersunk (flat head), 80-degree included angle |
| Drive Type | Phillips (H), Pozidriv (Z), Hexalobular/Torx (IRS) |
| Point Form | Form C (cone/gimlet point) or Form F (flat/blunt end) |
| Size (d mm) | Thread Dia (min-max mm) | Pitch | Length (mm) | Thread Length (mm) |
|---|---|---|---|---|
| ST2.9 | 2.9-2.9 | 1.1 | 13 | 13 |
| ST3.5 | 3.5-3.5 | 1.3 | 16 | 16 |
| ST4.2 | 4.2-4.2 | 1.4 | 19 | 19 |
| ST4.8 | 4.8-4.8 | 1.6 | 22 | 22 |
| ST5.5 | 5.5-5.5 | 1.8 | 25 | 25 |
