Description
Overview
DIN 916 defines a hexagon socket set screw, commonly called a cup point grub screw. The headless design allows the screw to sit inside or flush with the component, while the cup point bites into the mating shaft or surface to resist movement.
This selected size is specified with diameter M8, length 8 mm, thread M8, pitch 1.25 mm.
Sold in multiples of '100 pieces. 1 Box = '100 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
DIN 916 cup point grub screws are used for collars, pulleys, gears, handles, knobs, hubs, shaft-mounted components and mechanical adjustments where a protruding head is not required.
Technical Tips
- The cup point can mark the shaft or mating surface, which is useful for grip but may not suit delicate components.
- Use the correct hex key size to prevent rounding the socket.
- Apply threadlocker where vibration is present.
- For repeated adjustments, consider whether the point style is suitable for the shaft material.
Frequently Asked Questions
What does the cup point do? The cup point digs slightly into the mating surface to improve grip and resist rotation or sliding.
Dimensions – DIN 916 / ISO 4029 M8 x 8
| Standard | DIN 916 / ISO 4029 |
|---|---|
| Product | Hexagon socket set (grub) screw, cup point |
| Thread | M8 x 1.25 |
| Length (l) | 8 mm |
| Hex key (s) | 4 mm |
| Point | cup point |
| Weight (calculated) | 2.13 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.
DIN 916 data sheet – all sizes
| Size | Thread | Hex key (s) | Point |
|---|---|---|---|
| M3 | M3 x 0.5 | 1.5 mm | cup point |
| M4 | M4 x 0.7 | 2 mm | cup point |
| M5 | M5 x 0.8 | 2.5 mm | cup point |
| M6 | M6 x 1 | 3 mm | cup point |
| M8 | M8 x 1.25 | 4 mm | cup point |
| M10 | M10 x 1.5 | 5 mm | cup point |
| M12 | M12 x 1.75 | 6 mm | cup point |
| M16 | M16 x 2 | 8 mm | cup point |
| M20 | M20 x 2.5 | 10 mm | cup point |
| M24 | M24 x 3 | 12 mm | cup point |
Nominal dimensions per DIN 916 / ISO 4029. 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 | M8 |
| Thread Pitch | 1.25 mm |
| Thread Style | Fully Thread |
| Drive Size | 4 mm |
| Head Style | Hex |
| Point Type | Cup Point |
| Diameter | M8 |
| Length | 8 mm |
| Material | Stainless Steel |
| Finish | Stainless steel |
| Grade | Grade (A4) |
| Standards Met | DIN 916 |
| Package Quantity | 100 |
| Package Type | Box |