(EUR)
Female Thumbscrew Knob M4 x 20mm Diameter
This M4 Female Thumbscrew Knob with a 20 mm diameter head offers quick, tool-free fastening for a wide range of light-duty fixtures, equipment... Read Full Description
- Price
- 1 + £2.88 £2.40
- 24 + £2.71 £2.26
- 100 + £2.29 £1.91
- 1000 + £1.63 £1.36
Frequently bought together
This M4 Female Thumbscrew Knob with a 20 mm diameter head offers quick, tool-free fastening for a wide range of light-duty fixtures, equipment adjustments and assembly applications. Designed for comfortable fingertip control, the ergonomic knob allows users to tighten or loosen components easily, even in confined spaces or during frequent adjustments.
The durable polymer knob provides strong grip and long-term resistance to wear, while the M4 female threaded insert ensures a secure, reliable connection to machine screws, bolts or threaded studs. Ideal for jigs, fixtures, housings, furniture, equipment panels and general mechanical adjustments, this thumbscrew knob delivers dependable performance wherever fast, simple hand tightening is required.
Key Features
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M4 female thread for secure mechanical fastening
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20 mm diameter ergonomic knob for easy hand tightening
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Tool-free operation — ideal for frequent adjustments
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Durable polymer construction for long service life
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Suitable for light-duty fixtures and equipment
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Provides comfortable grip with smooth control
Specifications
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Thread type: Female M4
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Knob diameter: 20 mm
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Material: High-strength polymer with metal insert
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Colour: Black
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Style: Thumbscrew knob
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Application: Light-duty fastening & adjustments
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SKU: TSF-20M4
Applications
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Workshop jigs & fixtures
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Furniture and equipment adjustments
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Electronics and control panel enclosures
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Light machinery & assembly tasks
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Retail and display fittings
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DIY and hobbyist projects
Why Choose Ross Castors
At Ross Castors, we supply knobs and hand-fastenings designed for smooth, reliable operation. This M4 female thumbscrew knob provides fast, convenient tightening with a comfortable grip and durable construction.
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20 |
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20 |
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M4 |
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20 |
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Handle Height (mm) |
20 |
FAQs
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Delivery Charges
For a more detailed view of our delivery charges please visit our UK Delivery & Returns or International Delivery & Returns page.
Please note that our standard shipping rates do not apply to tubing orders. Tubing has its own unique shipping rate, which is automatically calculated at checkout. We've tailored these rates to ensure the best possible delivery service for these items!
UK Mainland
Please note final delivery cost is calculated at checkout based on order weight and destination.
| Delivery Option | Delivery Cost (£) |
|---|---|
| 2 Working Days Express Pack (for small orders) | £7.09 |
| 2 Working Days | From £9.13 |
| Next Working Day | From £10.66 |
| By 12 PM Next Working Day | From £16.83 |
| By 10:30 AM Next Working Day | From £23.46 |
| Saturday Delivery | From £17.85 |
| 3 Day Pallet Delivery (for large orders) | £100 |
Northern Ireland, Highlands and Islands
Please note delivery costs for Northern Ireland, Highlands, and Islands vary based on location and order weight.
| Delivery Option | Delivery Cost (£) |
|---|---|
| Northern Ireland (2-3 working days) | From £16.32 |
| Scottish Highlands (2-3 working days) | From £19.38 |
| Isle of Man (2-3 working days) | From £19.38 |
| Channel Islands (2-3 working days) | From £19.38 |
Delivery Surcharge for Highlands and Islands Postcodes:
Please note that the following postcodes in the Highlands and Islands of Scotland incur additional delivery charges due to their remote locations and the higher shipping costs associated with these areas.
Postcodes affected include:
AB31-AB56
FK17-FK21
HS1-HS9 (Outer Hebrides)
IV (Inverness and surrounding areas)
KA27-KA28 (Isle of Arran and Cumbrae)
KW (Kirkwall and Orkney)
PA20-PA78 (Argyll and Bute, Inner Hebrides)
PH15-PH50 (Perthshire and the Highlands)
ZE1-ZE3 (Shetland Islands)
These areas are subject to a delivery surcharge due to increased transportation costs and extended delivery times. We strive to keep our delivery charges as competitive as possible and appreciate your understanding when shipping to these regions.
For more information or to get a specific delivery quote, please contact our customer service team.
Returns
If you're not satisfied with your purchase, ordered the wrong size, or find the items unsuitable, return them within 28 days along with the delivery note and a brief explanation for a refund or exchange. Please contact us before returning items to ensure eligibility. Note that we cannot refund items damaged through use.
We recommend using a recorded and insured delivery method for returns, as we're not responsible for goods lost or damaged in transit. Keep proof of postage. Refunds typically do not cover original delivery costs, and returns of sack trucks, trolleys, and mobile steps may incur a restocking fee.
For full terms and conditions click here.