Description
Overview
DIN7981 defines a self tapping screw style designed to form or cut its own mating thread in suitable materials. Self tapping screws reduce the need for a separate nut and are useful in sheet metal, plastics and light assemblies.
This selected size is specified with diameter 5.5 mm, length 25 mm, thread 5.5 mm.
Sold in multiples of '100 pieces. 1 Box = '100 pieces.
Material, Grade & Strength
A2 (304) stainless steel provides good general corrosion resistance for outdoor and clean industrial environments.
Finish & Corrosion Protection
Match the finish to the operating environment and corrosion exposure.
Typical Uses
Commonly used in sheet metal work, appliance repair, light fabrication, plastic housings, electrical enclosures and maintenance.
Technical Tips
- Use the correct pilot hole for the material thickness.
- Avoid over-tightening, which can strip the formed thread.
- Choose the correct drive bit to prevent cam-out and head damage.
Selection Advice
Confirm the standard, size, material, finish and drive style before ordering to ensure compatibility with the assembly.
Dimensions – DIN 7981 / ISO 7049 M5.5 x 25
| Standard | DIN 7981 / ISO 7049 |
|---|---|
| Product | Cross recess pan head self tapping screw |
| Thread | ST5.5 (#12 gauge) |
| Length (l) | 25 mm |
| Head diameter (dk) | 11 mm |
| Head height (k) | 4 mm |
| Drive | Pozi/Phillips |
| Thread form | ISO 1478 self tapping (C point) |
| Weight (calculated) | 5.43 kg per 1 000 pieces |
Material, Grade & Strength
| Material | Stainless steel A2 (304) |
|---|---|
| Steel grade | AISI 304 (1.4301) |
| Composition | C max 0.07%, Cr 17.5-19.5%, Ni 8.0-10.5% |
| Typical use | general corrosion resistance, indoor/outdoor, food equipment |
Finish & Corrosion Protection
Plain / self colour: No applied coating. Stainless, brass and nylon parts are supplied plain; plain steel parts need oil, paint or protected environments.
DIN 7981 data sheet – all sizes
| Size | Thread | Head diameter (dk) | Head height (k) | Drive | Thread form |
|---|---|---|---|---|---|
| M2.2 | ST2.2 (#2 gauge) | 4 mm | 1.6 mm | Pozi/Phillips | ISO 1478 self tapping (C point) |
| M2.9 | ST2.9 (#4 gauge) | 5.6 mm | 2.2 mm | Pozi/Phillips | ISO 1478 self tapping (C point) |
| M3.5 | ST3.5 (#6 gauge) | 7 mm | 2.6 mm | Pozi/Phillips | ISO 1478 self tapping (C point) |
| M3.9 | ST3.9 (#7 gauge) | 7.5 mm | 2.8 mm | Pozi/Phillips | ISO 1478 self tapping (C point) |
| M4.2 | ST4.2 (#8 gauge) | 8 mm | 3.1 mm | Pozi/Phillips | ISO 1478 self tapping (C point) |
| M4.8 | ST4.8 (#10 gauge) | 9.5 mm | 3.7 mm | Pozi/Phillips | ISO 1478 self tapping (C point) |
| M5.5 | ST5.5 (#12 gauge) | 11 mm | 4 mm | Pozi/Phillips | ISO 1478 self tapping (C point) |
| M6.3 | ST6.3 (#14 gauge) | 12 mm | 4.6 mm | Pozi/Phillips | ISO 1478 self tapping (C point) |
Nominal dimensions per DIN 7981 / ISO 7049. Weights are calculated from nominal dimensions and are a guide only (±10%). Values for fit and strength should be confirmed against the standard for critical applications.
Specifications
| Measurement Type | Metric |
|---|---|
| Thread Size | 5.5 mm |
| Thread Style | Fully Thread |
| Drive Type | Pozi |
| Head Style | Pan |
| Diameter | 5.5 mm |
| Length | 25 mm |
| Material | Stainless Steel |
| Finish | Stainless steel |
| Grade | Grade (A2) |
| Standards Met | DIN 7981 |
| Package Quantity | 100 |
| Package Type | Box |