Type A:
Shallow cylindrical bend; arc not to exceed 58 degrees
Type B:
Cylindrical bend; arc exceeds 58 degrees but not 90 degrees
Type C:
Curve-plus-tangent with curve limited to 60 degrees. Tangent may not constitute more than 1/3 of the total girth
Type D:
Curve-plus-tangent with curve not exceeding 38-1/2 degrees of arc. Tangent may not exceed the arc
Type E:
Curve-plus-tangent type has a tangent not more than twice the curve and curved portion not exceeding 90 degrees of arc
Type F:
Curve exceeds 90 degrees but not 128 degrees
Type G:
Non-circular curve. Shape is that of a shallow letter "S"
Type H:
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
Type J:
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
Type K:
Curve exceeds 128 degrees but not 180 degrees
Type L:
Two curves of like radius and each not exceeding 90 degrees with a common tangent between them
Type M:
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.