Quick Facts

General Tolerances
Tolerances is defined as the amount of allowable deviation. The use of general tolerances will normally reduce secondary operations, keeping cost to a minimum.

The tolerances shown can be attained in most instances.

Dimensions Tolerances Dimension Tolerances
Up to 1.000 ±0.005 Up to 25.40 ±0.127
Up to 2.000 ±0.010 Up to 50.80 ±0.254
Up to 3.000 ±0.015 Up to 76.20 ±0.381
Up to 4.000 ±0.020 Up to 101.60 ±0.508
Up to 5.000 ±0.022 Up to 127.00 ±0.559
Tolerances applied linearly ± .005 in/in

Straightness is the deviation of the cast axis from the true axis

If one side is concave and the other side is convex,
the casting would be out of straight

Flatness tolerances can only be generally applied, as it varies with configuration and alloy used

Cocentricity is defined as two cylindrical surfaces sharing a common point or axis as their center.

Minimum Tolreance: .005"


Wall Thickness
Wall thickness is dependent upon size, configuration and alloy choice.
Minimum wall thickness: 1/16"
Surface Texture
Minimum surface texture: 125 AA
Size & Weight
16" Maximum diameter
22" Maximum length
1/4 oz. to 80 lbs.

A gate is the channel through which the molten metal enters the part.

Fillets and Radii
Sharp corners and intersections can lead to unsound conditions and poor structural characteristics. as a general rule, the radius should be one-third to one-half the section thickness.


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Becker Metal Works, Inc.
800 Fred Moore Highway • St. Clair, MI 48079
Toll Free: 800-531-9266 • Ph: 810-329-9310 • Fax: 810-329-9489
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