Shallow cylindrical bend; arc not to exceed 58 degrees
Cylindrical bend; arc exceeds 58 degrees but not 90 degrees
Curve-plus-tangent with curve limited to 60 degrees. Tangent may not constitute more than 1/3 of the total girth
Curve-plus-tangent with curve not exceeding 38-1/2 degrees of arc. Tangent may not exceed the arc
Curve-plus-tangent type has a tangent not more than twice the curve and curved portion not exceeding 90 degrees of arc
Curve exceeds 90 degrees but not 128 degrees
Non-circular curve. Shape is that of a shallow letter "S"
Central curve flanked by tangents which may be equal or unequal. The curve may not exceed 90 degrees, and both tangents together in length may not exceed 1/4 the total girth
Tangent-plus-arc-plus-tangent; curve 90 degrees or less, the tangents together, equal or unequal, not to exceed 3/4 of the total girth
Curve exceeds 128 degrees but not 180 degrees
Two curves of like radius and each not exceeding 90 degrees with a common tangent between them
Deep-curve-plus-tangent; curve will exceed 90 degrees of the arc
Types of Edgework
Seamed, pencil ground, pencil polished, flat ground with chamfer, flat polished with chamfer.