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ISO 9001:2008  

Linear Tolerances

Basic linear tolerance E1 call outs represent tolerances on one side of the parting line only. For dimensions that cross the parting line add E2 to E1. For dimensions including features in both the mold itself and in core add E3 to E1 and/or E2. The amount of additional tolerance for E2 and E3 is determined by the projected area of either the casting at the parting line for E2 or the projected area of the core in contact with the casting for E3.

For dimensions which cross the parting line, are defined in part by core or are in some other way additive, these tolerances may require some expansion. The foundry should be consulted and good judgment is recommended.

Many foundries, including St. Paul Brass and Aluminum Foundry, can produce to substantially tighter tolerances than those published by the Trade Associations. Consult your foundry for specific information.

 

Basic Linear Tolerance (E1)
Sand Permanent Mold
Machined Tooling Cast & Polished Mold
Up thru 6 in. +- 0.030 Up through 1 in. +- 0.015 +- 0.030
Additional each inch over 6 +- 0.003 Additional each inch over 1 +- 0.002 +- 0.003

Additional Tolerance for Cores or Across Parting Lines (E2 & E3)
Projected Horizontal Sand Casting Permanent Mold Permanent Mold Permanent Mold
Area of Casting or Core Parting Line & Core Parting Line Sand Core Metal Core
Up to 10 square inches +- 0.020 +- 0.010 +- 0.015 +- 0.010
10 - 50 sq in +- 0.035 +- 0.015 +- 0.025 +- 0.015
50 - 100 sq in +- 0.045 +- 0.020 +- 0.030 +- 0.015
100 - 250 sq in +- 0.060 +- 0.025 +- 0.040 +- 0.022
250 - 500 sq in +- 0.090 +- 0.030 +- 0.050 +- 0.032
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St. Paul Foundry
954 Minnehaha Avenue West
Saint Paul, Minnesota 55104
(651) 488-5567  Fax: (651) 488-0908
Sales: (651) 312-4734 email

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