What standard tolerances are applied to forgings?
Closed die forgings are supplied in accordance with the standards laid down by the United States Drop Forging Association. These standards cover thickness, match, radii, straightness, draft angles, surface condition and die wear. Upset forgings are usually produced in accordance with British Standard No 4114. Close dimensional tolerances are also specified where forgings are required to be produced to closer limits. Forgings may be cold coined to produce even closer tolerances on specific faces. The whole question of tolerance needs to be discussed with the forging supplier, as very often a satisfactory arrangement can be negotiated on specific tolerance requirements. Forgings produced in non-ferrous metals and by warm or cold forging methods will be more tightly toleranced than those produced by hot forging of steel.
