Clasps which have either circular projections or recesses which fit into or over disk catchplates.
Clasps usually of metal with a single hole to fit over an edge pin or side pin.
Metal fastenings in a which a lock worked with a key was incorporated into either the catchplate or the clasp. These were not uncommon on nineteenth-century stationery bindings, but may be found on earlier bindings.
Flat bands or strips of material of uniform breadth, usually of tanned or alum-tawed skin or parchment, but also less frequently of textile, or combinations of any of these three, used to attach clasps to bookboards or as fastenings with buckles.
Short external bevels found both above and below the fastenings on the fore-edges of boards with centre chamfers. Clasp bevels were especially popular in bindings with wooden boards made in German-speaking countries in the sixteenth and seventeenth centuries, but will also be found in bindings made in other northern-European countries.
The movable hooks or rings which lock onto catchplates or pins on the opposite side of a bookblock edge.
Recesses created on the edges of a board to accommodate a fastening.
Clasp fastenings consist of two parts: one a catchplate or pin located on one board or cover of a book, and the other a hook or ring on the opposing board or cover which catches on the catchplate or pin on the other side. The hook or ring may be attached to the board by means of a clasp strap or a hinge plate.
Metal fittings, the outer end of which is rolled over to form a hook which is more less semi-circular in cross section, the inner end of which is attached to the fore-edge of a book board, by means either of a clasp strap or a hinge. The clasp hooks could be made from cast metal or made out of strips of metal. They can be shaped and decorated in many different ways.
Clasps attached directly to hinge plates by means of pin hinges.
Christopher Clarkson (1996), “Further Studies in Anglos-Saxon and Norman Bookbinding: Board Attachment Methods Re-Examined”, in Roger Powell, the Compleat Binder: Liber Amicorum, edited by John L Sharpe, 14, Bibliologia, Turnhout, Brepols, pp. 154–214.