Normal and Premium Linear Tolerances for Investment Castings

SEBON produceprecision casting components with limited size and tolerances to make sure our investment castings quality. Typically, a linear tolerance of ±0.005 in/in (0.127 mm/in.) is standard for investment castings (As table below). For example, if a 1-ft. component were cast, it likely would have a tolerance of ±0.06 in. (1.52 mm). This would vary depending on the size and complexity of the part. Post-casting procedures, such as straightening or coining, often allow for tighter tolerances to be maintained on several specific dimensions.
Normal and Premium Linear Tolerances for Investment Castings

Dimensions (in.)	Normal Tolerances (± in.)	Premium Tolerances (± in.)
Up to 0.25	0.005	0.003
Up to 0.5	0.005	0.004
Up to 1	0.005	0.005
Up to 2	0.01	0.01
Up to 3	0.015	0.013
Up to 4	0.019	0.015
Up to 5	0.022	0.017
Up to 6	0.025	0.02
Up to 7	0.028	0.022
Up to 8	0.031	0.024
Up to 9	0.034	0.026
Up to 10	0.037	0.028

By working with an investment casting firm’s engineering staff, design engineers can produce an investment casting drawing for a part that substantially reduces or completely eliminates the previous machining requirements to produce an acceptable component.