M4 x 25mm Captive Knurled Thumb Screw (~DIN 464) | A1 Stainless Steel
| Quantity |
Unit Price
(ex. VAT)
|
Unit Price
(inc. VAT)
|
|---|---|---|
| 1 - 49 | £5.28 | £6.33 |
| 50 - 99 | £4.69 | £5.63 |
| 100 - 249 | £4.22 | £5.06 |
| 250 - 499 | £3.83 | £4.60 |
| 500 - 999 | £3.52 | £4.22 |
| 1000 + | £3.02 | £3.62 |
Product Specification
| Thread Size | M4 |
| Pitch | 0.70mm |
| Captive Diameter | 3.0mm |
| Thread Length | 25mm |
| Threaded Length | 8mm |
| Head Diameter | 16.35mm |
| Head Height | 9.5mm |
| Knurled Height | 3.5mm |
| Shank Diameter | 8.0mm |
| Material | A1 Stainless Steel |
| Standard | Similar to DIN 464 |
Frequently Bought Together
Total Price: £0.00
M4 x 25mm Captive Knurled Thumb Screw (~DIN 464) | A1 Stainless Steel | Vital Parts – THUM464CT-M4-25-A1
This M4 x 25mm Captive Knurled Thumb Screw (~DIN 464) | A1 Stainless Steel is built for applications where quick manual adjustment, reliable thread engagement and a captive-style fixing are needed. It features a M4 thread with a 25mm thread length and 8mm threaded length, giving the screw a defined fixing depth while the 3.0mm captive diameter helps retain the component within suitable captive screw assemblies. The 16.35mm head diameter, 9.5mm head height and 3.5mm knurled height provide a secure finger grip for tightening, loosening and repositioning without standard driver tools.
Made from A1 Stainless Steel with a self-colour finish, this screw is suitable for engineering, manufacturing and equipment maintenance environments where corrosion resistance and clean stainless appearance are required. The design is Similar to DIN 464, making it a useful DIN 464-style option for enclosures, jig plates and serviceable machine panels where extra thread engagement is needed without using a tool-adjusted screw.
What Are Captive Knurled Thumb Screws?
Captive knurled thumb screws are externally threaded fasteners with a raised, textured head that can be tightened by hand. The captive section is designed to help keep the screw associated with its panel or assembly, reducing the chance of misplaced fixings during inspection, cleaning or maintenance. This M4 x 25mm version follows a Similar to DIN 464 format for hand-operated fastening applications.
Applications and Key Industries
These DIN 464-style captive knurled thumb screws are used across the UK in applications where a secure fixing must remain easy to operate by hand. Common use cases include:
- Manufacturing and Engineering: Hand-operated fastening for M4 machine assemblies, removable guards and access covers.
- Electronics and Enclosures: Securing inspection panels, casework and serviceable housings where a 25mm screw length is suitable.
- Machinery Maintenance: Captive-style retention for covers and fixtures that are removed frequently during servicing.
- Jigs and Fixtures: Manual clamping or positioning where a 8mm threaded length provides controlled engagement.
Purchasers typically include procurement teams, maintenance engineers, machine builders and workshop supervisors who need dependable hand-adjustable stainless fasteners for serviceable assemblies.
Why Choose This Captive Knurled Thumb Screw?
Choose this M4 thumb screw when the fixing needs to be released and tightened quickly without a hex key, screwdriver or spanner. The 8.0mm shank diameter and knurled head profile make it suitable for repeat-use panels, while the A1 Stainless Steel construction supports dependable performance in indoor industrial environments.
Key Features
- Tool-free operation: Knurled thumb head supports quick hand tightening and removal without specialist tools.
- Captive-style design: 3.0mm captive diameter helps reduce loose or misplaced fixings when used in a suitable assembly.
- Defined metric engagement: M4 thread with 8mm threaded length supports consistent fastening depth.
- Stainless steel construction: A1 Stainless Steel provides a clean, corrosion-resistant finish for engineering applications.
Product Specifications
- Thread Size: M4
- Thread Length: 25mm
- Threaded Length: 8mm
- Captive Diameter: 3mm
- Head Diameter: 16.35mm
- Head Height: 9.5mm
- Knurled Height: 3.5mm
- Shank Diameter: 8mm
- Pitch: 0.70mm
- Standard: Similar to DIN 464
- Material: A1 Stainless Steel
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