Stainless Cross Recessed Countersunk Head Self Tapping Screws
| Standard | DIN 7982 · ISO 7050 |
|---|---|
| Material | SS304 / SS316 |
| Strength Grade | A2-70 / A4-70 |
| Size Range | ST2.2-ST6.3 |
| Surface Treatment | Passivation / Polished |
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Product Description
Product Description & Key Specifications
Stainless cross recessed countersunk head self tapping screws are used where the screw head must sit flush with a sheet metal, cover plate or exposed panel surface. They are supplied to DIN 7982 / ISO 7050 in SS304 / SS316 with A2-70 / A4-70 grade references and ST2.2-ST6.3 size coverage.
The countersunk head shape is selected for flush finish and reduced snagging, while the self tapping thread forms or cuts its mating thread in suitable sheet metal or pre-drilled substrates. Correct use requires confirming pilot hole size, sheet thickness, drive recess, head angle, material, corrosion environment and installation torque.
SS304 / A2 is suitable for general indoor, architectural and outdoor atmospheric applications. SS316 / A4 is preferred for coastal, chloride, washdown or rail exterior environments. Passivation improves stainless surface condition after manufacturing, while polishing can be specified where exposed appearance matters.
| Product type | Stainless cross recessed countersunk head self tapping screws |
|---|---|
| Standards | DIN 7982 / ISO 7050 |
| Material | SS304 / SS316 |
| Strength grade | A2-70 / A4-70 |
| Size range | ST2.2-ST6.3 |
| Common models | ST2.9 x 13, ST3.5 x 16, ST4.2 x 19, ST4.8 x 25, ST5.5 x 32, ST6.3 x 38 |
| Drive and head | Cross recessed countersunk head for flush installation |
| Surface finish | Passivation / Polished |
| Matched hardware | Sheet metal panels, cover plates, countersunk holes and prepared pilot holes |
| Documentation | CoC, material certificate and dimensional report on request |
Dimensions & SpecificationsDIN 7982 / ISO 7050
Technical Drawing
Dimensional Table
| Parameter | ST2.2 | ST2.9 | ST3.5 | ST3.9 | ST4.2 | ST4.8 | ST5.5 | ST6.3 |
|---|---|---|---|---|---|---|---|---|
| P | 0.8 | 1.1 | 1.3 | 1.3 | 1.4 | 1.6 | 1.8 | 1.8 |
| a/max | 0.8 | 1.1 | 1.3 | 1.3 | 1.4 | 1.6 | 1.8 | 1.8 |
| dk/max | 4.3 | 5.5 | 6.8 | 7.5 | 8.1 | 9.5 | 10.8 | 12.4 |
| dk/min | 4 | 5.2 | 6.44 | 7.14 | 7.74 | 9.14 | 10.37 | 11.97 |
| k | 1.3 | 1.7 | 2.1 | 2.3 | 2.5 | 3 | 3.4 | 3.8 |
| No. | 1 | 1 | 2 | 2 | 2 | 2 | 3 | 3 |
| M | 2.5 | 3 | 4.2 | 4.6 | 4.7 | 5.1 | 6.8 | 7.1 |
| t/min | 1.02 | 1.4 | 1.62 | 2.03 | 2.11 | 2.59 | 2.95 | 3.33 |
| t/max | 1.32 | 1.7 | 2.12 | 2.53 | 2.62 | 3.1 | 3.53 | 3.91 |
Engineering references
Technical resources
Review the applicable dimensions, drawing and standard relationship before confirming the ordered specification.02
Selection
Selection Advantages by Application
Flush Sheet Metal Fixing
Countersunk self tapping screws are used for access covers, cover plates and sheet metal panels where the screw head must sit flush with the surface.
Construction fastenersRailway Interior and Exterior Panels
SS304 / SS316 screws support corrosion-resistant rail panel assemblies, trim pieces and exposed fittings. SS316 / A4 can be specified where washdown or chloride exposure is expected.
Railway fastenersArchitectural Stainless Hardware
Polished countersunk screws are useful for visible stainless panels, facade accessories and hardware where flush fit and surface appearance both matter.
Industrial equipment fasteners03
Assembly
Recommended Matching Products
04
Manufacturing
Manufacturing & Quality Control
Manufacturing CapabilityQuality Control
Cold heading and thread forming for stainless self tapping screwsSS304 / SS316 material verification before production
Countersunk head and cross recess forming to DIN / ISO dimensionsHead diameter, head angle, recess depth and thread profile inspection
Passivation or polishing for stainless surface conditionSurface appearance, burr and contamination checks after finishing
Standard and drawing-based ST size supplyLength, diameter, point form and pilot-hole fit review when specified
Bulk, carton or project kit packagingCoC, material certificate and dimensional report prepared on request
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FAQ
Common Questions Before RFQ
When should I choose countersunk self tapping screws?
Choose them when the screw head needs to sit flush with a panel, cover plate or sheet metal surface.
Should I choose SS304 or SS316?
SS304 is suitable for general corrosion resistance. SS316 is preferred for coastal, chloride, washdown or harsher outdoor environments.
Do self tapping screws need a pilot hole?
Most sheet metal self tapping applications use a prepared pilot hole. Pilot hole size depends on screw size, material and sheet thickness.
What sizes are commonly requested?
Common RFQ sizes include ST2.9, ST3.5, ST4.2, ST4.8, ST5.5 and ST6.3 with project-specific lengths.
Can polished stainless screws be supplied?
Yes. Passivated and polished surface options are available depending on corrosion and appearance requirements.
Need stainless countersunk self tapping screws?
Send standard, ST size, length, material, finish, pilot hole requirement, quantity and packaging needs. We can quote DIN 7982 / ISO 7050 stainless screws for flush sheet metal and panel assemblies.
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