M4 x 20mm Cap Head Captive Screw (H3) (~DIN 912) | Marine Grade A4 Stainless Steel
| Quantity |
Unit Price
(ex. VAT)
|
Unit Price
(inc. VAT)
|
|---|---|---|
| 1 - 49 | £3.33 | £3.99 |
| 50 - 99 | £2.96 | £3.55 |
| 100 - 249 | £2.66 | £3.19 |
| 250 - 499 | £2.42 | £2.90 |
| 500 - 999 | £2.22 | £2.66 |
| 1000 + | £1.90 | £2.28 |
£3.99 / each
.png)
Product Specification
| Thread Size | M4 |
| Pitch | 0.70mm |
| Length | 20mm |
| Captive Diameter | 3.0mm |
| Threaded Length | 8.0mm |
| Drive | H3 |
| Head Diameter | 7.0mm |
| Head Height | 4.0mm |
| Material | A4 Stainless Steel |
| Standard | Similar to DIN 912 |
Frequently Bought Together
Total Price: £0.00
M4 x 20mm Captive Socket Cap Head Screw | Similar to DIN 912 | A4 Stainless Steel
This M4 x 20mm retained cap head screw is suited to industrial equipment, fabricated housings and service access points where removable panels must be opened without completely separating the fastening hardware. The 0.70mm pitch, H3 drive and 8.0mm threaded length provide the main installation details for the screw. A4 Stainless Steel provides enhanced corrosion resistance for suitable outdoor, washdown, coastal and marine applications where a higher level of environmental resistance is required.
What Are Captive Socket Cap Head Screws?
Captive Cap Screws are used where a conventional fully removable screw could create a loose-part risk during maintenance. Their reduced captive diameter allows a suitable retention feature to hold the screw to the panel while the threaded end engages and disengages from the mating component.
Common Applications
- Jigs and Fixtures: Keeps adjustment or access fasteners associated with suitable workshop fixtures and production tooling.
- Laboratory Equipment: Supports retained panel fixing on instruments and serviceable technical equipment.
- Fabricated Housings: Provides a captive fastening format for custom covers, guards and equipment enclosures.
- General Engineering: Useful where a screw needs to remain attached to the assembly after disengaging from its mating thread.
M4 x 20mm Captive Socket Cap Head Screw Dimensions
- Thread Size: M4
- Length: 20mm
- Threaded Length: 8.0mm
- Captive Diameter: 3.0mm
- Head Diameter: 7.0mm
- Head Height: 4.0mm
- Drive: H3
- Pitch: 0.70mm
- Standard: Similar to DIN 912
- Material: A4 Stainless Steel
Key Benefits
- Captive format can reduce dropped or misplaced fasteners during servicing when installed with a suitable retaining feature.
- 8.0mm threaded length provides the portion that engages the mating internal thread.
- 4.0mm head height provides the specified socket cap head profile.
- 0.70mm metric pitch matches the stated thread specification.
See our wider Socket Cap Head Captive Screws range for other sizes and stainless steel grades. We also stock other styles in our Captive Screws range, including countersunk captive screws for applications where a flush head is preferred. For product-selection support, speak with our team on 01233 713581.
Fri 8.30 am - 3.30 pm
