#6 SS Self Tapping Screw CSK Head
ISO 7050 ST3.5 (#6) stainless steel countersunk head self-tapping screws in A2 (304) grade. Flush-mounting thread-forming screws for thin-gauge fabrication at ST3.5 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
#
The ST3.5 (#6) gauge stainless steel countersunk self-tapping screw addresses flush fastening in thin-material assemblies requiring corrosion resistance. The self-tapping thread forms a secure mechanical connection in pre-drilled holes without separate tapping. A2 grade provides inherent corrosion protection. The flush head removes the need for secondary finishing to address protruding fasteners. This gauge is suited to sheet metal fabrication, cladding, and appliance manufacturing.
Common Applications
#
ST3.5 (#6) SS countersunk self-tapping screws are specified for flush thin-material fastening:
- Sheet metal fabrication
- HVAC ductwork and ventilation
- Electrical panel assembly
- Automotive body panels
- Marine fittings and deck hardware
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 |
