The tolerances set forth herein represent what the Forging Industry Association believes to be typical within the industry, as determined by actual measurements . Is Die Steel Forging Standard – Download as PDF File .pdf), Text File .txt) or read IS to 3 (): Tolerances for Closed Die Steel. Resource for typical forging tolerances with impression die forgings.

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Flat and thin with protrusion at right angles to the parting line. In such cases, the requirements of the forging should be confirmed by purchaser and producer in advance of production. Die wear varies according to the material that is forged and the shape of the forging.

Flash is measured from the body of the forging to the trimmed edge of the flash. Raised to the next highest 0. Finish allowance refers to the amount of material that is to be machined from the forging to obtain the finished part. Length mm x Die Wear Tolerance factor.

Is Die Steel Forging Standard – Free Download PDF

Over to x Over 65 to x Greatest Length x Die Wear Tolerance factor. Area at the Trim Line Flash not included, expressed in square millimeters. Die Wear Tolerances do not apply on center-to-center dimensions. Radii Tolerances are expressed as decimal millimeter in units of 0.

It is important that forging drawing be tooerance and complete. There firging practical limitations in dimensions and other characteristics of forged parts or products which vary according to the part or product and the producer’s equipment.

Forging dimensions are commonly analyzed independently, with consideration given to all applicable tolerances including match, straightness, length and width but not including die wear. The experience of producers and purchasers of forged parts and products indicates that the tolerances set forth herein will provide adequate dimensional accuracy for most applications. Unless the purchaser’s drawings and specifications direct otherwise, all dimensions are normally assumed to refer to lines intersecting at right angles to each fogring commonly referred to as X, Y, and Z axes.


Area at the Trim Line Flash not included, expressed in square inches.

All individual tolerances apply to each and every forged part unless specifically noted otherwise. Die Wear Tolerances for all length, width and diameter dimensions over mm or 30 in. Over Over 0.

Weights of Forgings After Trimming, in kilograms. The male portions of dies may, in special situations, tend to mushroom or upset rather than wear. The minimum should be plus or minus 0. Radii Tolerances relate to all fillet radii and corner radii. This tolerance is in addition to the Die Closure Tolerance.

Minimum Finish Stock Per Surface. Die Closure Tolerances are expressed decimal millimeter in units of 0. Die Closure Tolerances on forgings are based on the projected area of the forging at the trim line, not including flash, but including all areas to be subsequently punched out, and are applied as plus tolerances only.

Giving consideration to the fact that forgings undergo dimensional changes due to cooling and because forgings are formed in most cases between two impression dies that are not precisely on the same centerline, the ANSI Y There are several special ways of providing closer tolerances on selected dimensions on forgings with added operations.

9. APPENDIX A – TOLERANCES FOR IMPRESSION DIE | Forging Industry Association

This tolerance includes allowances for: Theoretical exactness is seldom attained, and it is therefore necessary to make allowance for deviations. Length x Die Wear Tolerance factor. See examples 5 and 6. Largest Length x Die Wear Tolerance factor. See examples 7 and 8. This will assist in the design of forging dies and tools, and in establishing effective inspection procedures. Largest Diameter mm x Die Wear Tolerance factor.


See Figures 8 and Example This document more closely interprets the needed dimensional and tolerance modifications for forgings discussed in this booklet. The Tolerance on flat portion is computed first: Furthermore, unless the purchaser’s drawings or specifications direct otherwise, circular shapes are normally assumed to be figures of revolution with a center on an axis, and all circular dimensions are normally shown as diameters.

Where tolerances are desired, agreement between purchaser and forging producer is normally reached before production proceeds.

Diameter x Die Wear Tolerance factor. This tolerance guide provides dimensioning and tolerancing that is considered os and not geometric. Tolerance on Internal Dimension.

Is.3469.1-3.1974 Die Steel Forging Standard

Where purchaser specified stock for machining, these imperfections are commonly permitted to within 1. Tolerances in this publication are expressed in decimal inch with metric equivalents sometimes referred to as “soft” metric conversion in the belief that this represents a practice most common in the industry at the time of publication.

Over 10 to 30 incl. Allowances for die wear occuring on dimensions measured perpendicular to the fundamental parting line of the dies are included in Die Closure Tolerances Table II. The purchaser should indicate his first operation locating points, normally a part of the drawing, and give prior notice should these points be changed.

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