M4 x 20mm Captive Knurled Thumb Screw (~DIN 464) | A1 Stainless Steel
| Quantity |
Unit Price
(ex. VAT)
|
Unit Price
(inc. VAT)
|
|---|---|---|
| 1 - 49 | £4.92 | £5.91 |
| 50 - 99 | £4.38 | £5.25 |
| 100 - 249 | £3.94 | £4.73 |
| 250 - 499 | £3.58 | £4.30 |
| 500 - 999 | £3.28 | £3.94 |
| 1000 + | £2.82 | £3.38 |
Product Specification
| Thread Size | M4 |
| Pitch | 0.70mm |
| Captive Diameter | 3.0mm |
| Thread Length | 20mm |
| 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 20mm Captive Knurled Thumb Screw (~DIN 464) | A1 Stainless Steel | Vital Parts – THUM464CT-M4-20-A1
Designed for repeat access and hand tightening, this M4 x 20mm Captive Knurled Thumb Screw (~DIN 464) | A1 Stainless Steel provides a practical fastening solution for deeper fastening points. It features a M4 thread with a 20mm 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?
Knurled thumb screws provide a hand-adjustable fixing point for covers, guards and access panels. The textured head helps operators apply torque by finger pressure, while the captive feature helps keep the fixing close to the assembly when loosened. This M4 x 20mm screw is produced as a Similar to DIN 464 thumb screw.
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:
- Equipment Panels: Hand tightening for M4 threaded covers, service plates and access doors.
- Fabrication and Assembly: Convenient manual fastening where a knurled head is preferred over a socket or slotted drive.
- Inspection Hatches: Captive-style screw retention for parts that must stay with the panel when loosened.
- Test Rigs and Fixtures: Fast repositioning for adjustable stops, covers and light-duty hold-down points.
Purchasers typically include equipment manufacturers, facilities teams, panel builders and technical purchasers who need dependable hand-adjustable stainless fasteners for serviceable assemblies.
Why Choose This Captive Knurled Thumb Screw?
This M4 x 20mm captive knurled thumb screw is a strong option where frequent access, manual operation and a neat stainless finish are important. The 16.35mm head gives a broad contact area for grip, while the 8mm threaded length helps ensure the engagement is matched to the specified assembly depth.
Key Features
- Manual fastening control: Allows controlled tightening by hand where over-complicated driver access is not required.
- Retained assembly support: Captive diameter is designed for applications where the screw should remain with the panel.
- Reliable material choice: A1 Stainless Steel supports long-lasting use in clean industrial and equipment settings.
- Clear dimensional specification: Thread, head, shank and pitch data are listed for accurate technical selection.
Product Specifications
- Thread Size: M4
- Thread Length: 20mm
- 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
Call Vital Parts Today
For expert advice, free product samples and same-day dispatch, call our England based customer support team on 01233 713 581. Register for your Vital Parts Business Account to unlock credit payment terms, preferential delivery options, exclusive trade pricing and a dedicated account manager.
Fri 8.30 am - 3.30 pm