Gobrecht & Ulrich
100 Extension Screws for Binding Screws - Silver / Nickel - 5 mm
100 Extension Screws for Binding Screws - Silver / Nickel - 5 mm
| Quantity* | Discount | Price |
| min. 2 | 3 % | £8.72 GBP |
| min. 4 | 6 % | £8.45 GBP |
| min. 6 | 9 % | £8.18 GBP |
| min. 8 | 12 % | £7.91 GBP |
| min. 10 | 15 % | £7.64 GBP |
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100 Extension Screws for Binding Screws - Silver / Nickel - 5 mm
5mm extension screws are compatible with all Gobrecht & Ulrich binding screws from 10 mm length. These extension screws can increase the capacity of your screw post binding without buying longer binding screws than the ones you might already have. You'll only receive extension screws without matching screw posts.
The extension screw has two parts. First, a binding post extension of 5mm length, with a standard 5mm hole diameter. Second, a 7.5 mm screw thread, which can be used with any matching screw post from 10 mm length. The screw head is slotted.
Easily increase the maximum capacity of your screw post binding
Simply use this extension screw instead of your standard screw and extend the length of your binding screw by 5mm.
Images similar to the product. You purchase the 5mm extension screw only. Does not include matching screw post.
Product Specifications
| Head size | Ø 10 mm |
| Length | 5 mm Binding Post (0.5 cm or 0.20 in) + 7.5 mm screw thread (0.75 cm or 0.30 in) |
| Screw thread | M4 |
| Material | Nickel-plated steel |
| Available colours | Silver (nickel) |
Book Binding Screw Size Chart
Not sure which size to choose? Use the chart below to find the right screw length based on the number of sheets you're binding with standard 80 gsm paper.
Each sheet of paper has two pages - a front and a back. So a 100-page document (printed double-sided) equals 50 sheets. The screw length refers to the inner post height between the caps, which determines how many sheets fit. If you only know the page count, use our Spine Width Calculator to estimate the correct length.
| Screw Length |
Approx. Sheet Capacity (80 gsm paper / 1 sheet ≈ 0.1 mm) |
Best for |
|---|---|---|
| 2 mm | 20 sheets / 40 pages | Swatch cards, tags, mini journals, paper crafts |
| 3.5 mm | 35 sheets / 70 pages | Small notebooks, restaurant menus, labels |
| 5 mm | 50 sheets / 100 pages | Sketchbooks, recipe books, leather bags, leather notebooks |
| 7 mm | 70 sheets / 140 pages | Craft journals, wedding albums, leather belts and pet collars |
| 10 mm | 100 sheets / 200 pages | Photo books, scrapbooks, thicker leather covers |
| 15 mm | 150 sheets / 300 pages | Project portfolios, artist lookbooks, DIY binders, sample swatches |
| 20 mm | 200 sheets / 400 pages | Large scrapbooks, custom albums |
Note: The sheet capacities and "best for" recommendations are approximate and can vary based on paper thickness and binding style. Always test with your specific materials to ensure a perfect fit.
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