Arch punches are sold individually and in sets: an individual punch suits a repeated hole size, while a set gives you different cutting diameters for changing jobs. Start with the hole your work requires, using the intended fastener, fitting or pattern to identify the cutting diameter before deciding whether a set contains sizes you will actually use.
Diameter determines whether a punched hole accepts its intended part snugly or leaves clearance around it. Among the 5 products that list pin hole diameter, most fall between 0.3 and 2.5 inches, and 0.6 inches is typical. Compare the stated size with the hole specification for your fitting or pattern, and verify that the listing’s diameter describes the cutting opening. The punch’s outside dimensions are not a substitute for that measurement. For rivets, eyelets and similar fittings, follow the fitting supplier’s hole guidance; the visible flange is not the part that passes through the material. If you are reproducing an existing hole, measure an undamaged example, since stretching or wear can make an old opening misleading.
Next, establish whether the punch is intended for your stock, including its composition and thickness. Suitability for leather does not by itself mean suitability for rubber, fabric or sheet metal, and stacking layers can demand more cutting depth than punching them separately. For holes close to a fold, raised seam or attached fitting, compare the punch body’s clearance with the space around the intended cut: the cutting edge may reach a spot that the wider body cannot. For repeated work, look for an accessible waste opening and instructions for removing lodged cutouts, since trapped waste can interrupt successive cuts.
Before buying, consult the instructions for the permitted striking tool and supporting cutting surface, and establish whether either is supplied or must be bought separately. Carbon Steel, Alloy Steel and Metal labels do not tell you the cutting edge’s hardness or whether the striking head requires a particular hammer or mallet. For upkeep, find out whether the cutting edge can be resharpened and what method preserves its profile and hole size; an unsuitable sharpening method can change the opening you bought the punch to make.
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