Description
Overview
ISO 7380 defines a hexagon socket button head screw with a low rounded head. The button head provides a neat appearance and a broad bearing surface, while the internal hex drive allows installation where external spanner clearance is not available.
This selected size is specified with diameter M4, length 8 mm, thread M4, pitch 0.7 mm.
Sold in multiples of '200 pieces. 1 Box = '200 pieces.
Material, Grade & Strength
A4 stainless steel, commonly associated with 316 stainless, is selected for improved corrosion resistance in coastal, chemical and harsh outdoor environments.
Finish & Corrosion Protection
Corrosion resistance is provided by the stainless material itself rather than a plated coating.
Typical Uses
ISO 7380 button head screws are used on visible assemblies, equipment covers, guards, frames, furniture, panels and light machinery where a low-profile rounded head is preferred.
Technical Tips
- Use the correct hex key or socket bit to avoid rounding the drive.
- Button heads are lower than socket cap screws, so check suitability for high-load joints.
- Use washers where surface protection or load spreading is needed.
- Select stainless or coated finishes for exposed environments.
Frequently Asked Questions
When should a button head be used? Use it where appearance, low profile and internal hex drive access are more important than the higher head strength of a socket cap screw.
Dimensions – ISO 7380 M4 x 8
| Standard | ISO 7380 |
|---|---|
| Product | Hexagon socket button head screw |
| Thread | M4 x 0.7 |
| Length (l) | 8 mm |
| Head diameter (dk) | 7.6 mm |
| Head height (k) | 2.2 mm |
| Hex key (s) | 2.5 mm |
| Weight (calculated) | 1.13 kg per 1 000 pieces |
Material, Grade & Strength
| Material | Stainless steel A4 (316) |
|---|---|
| Steel grade | AISI 316 (1.4401) |
| Composition | C max 0.07%, Cr 16.5-18.5%, Ni 10.0-13.0%, Mo 2.0-2.5% |
| Property class | A4-70 (ISO 3506) unless marked -80 |
| Tensile strength Rm (min) | 700 MPa (class 70), 800 MPa (class 80) |
| Yield Rp0.2 (min) | 450 MPa (class 70), 600 MPa (class 80) |
| Typical use | marine, coastal, chlorides, chemical plant |
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.
ISO 7380 data sheet – all sizes
| Size | Thread | Head diameter (dk) | Head height (k) | Hex key (s) |
|---|---|---|---|---|
| M3 | M3 x 0.5 | 5.7 mm | 1.65 mm | 2 mm |
| M4 | M4 x 0.7 | 7.6 mm | 2.2 mm | 2.5 mm |
| M5 | M5 x 0.8 | 9.5 mm | 2.75 mm | 3 mm |
| M6 | M6 x 1 | 10.5 mm | 3.3 mm | 4 mm |
| M8 | M8 x 1.25 | 14 mm | 4.4 mm | 5 mm |
| M10 | M10 x 1.5 | 17.5 mm | 5.5 mm | 6 mm |
| M12 | M12 x 1.75 | 21 mm | 6.6 mm | 8 mm |
| M16 | M16 x 2 | 28 mm | 8.8 mm | 10 mm |
Nominal dimensions per ISO 7380. 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 | M4 |
| Thread Pitch | 0.7 mm |
| Thread Style | Fully Thread |
| Drive Size | 2.5 mm |
| Drive Type | Socket |
| Head Style | Button |
| Diameter | M4 |
| Length | 8 mm |
| Material | Stainless Steel |
| Finish | Stainless steel |
| Grade | Grade (A4) |
| Standards Met | ISO 7380 |
| Package Quantity | 200 |
| Package Type | Box |