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Steel bookbinding mating screw extensions 20mm

Chicago extension posts 20mm (pack of 6)

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zinc-plated steel • archival • extendable • made in New Zealand

This six-pack of 20mm extension posts 32EP20-6 can be used to lengthen post-&-screws from our range of brass, silver or black Chicago bookbinding interscrews.

These steel bookbinding mating screw extensions 20mm are made from zinc-plated steel. They are not coloured to match the interscrews, as the posts are typically concealed by the item being bound.


Extension length 20mm. Diameter 5mm. Thread M4.


Extensions are available in 7mm, then 10 to 60mm in 5mm increments.

We also carry a range of brass, silver and black interscrews in various lengths. Interscrews, also known as post and screw sets, are the 'top and bottom' pieces for the extensions.


Interscrew components at The Photo Album Shop

Variables such as length, depth, diameter, thread length and pitch mean that it is HIGHLY UNLIKELY that our interscrews or extensions will fit into existing sets from different manufacturers. Instead of trying to match existing sets, we recommend that you consider replacing your existing interscrews entirely. This way you will be able to add extensions or obtain replacements later if required.