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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Tolerance on Length Dimension. Diameter mm x Die Wear Tolerance factor. See Table II, below. There are practical limitations in dimensions forgijg other characteristics of forged parts or products which vary according to the part or product and the producer’s equipment. It is equally important that the purchaser provide drawings of the finish machined part, or equivalent information.

Largest Diameter mm x Die Wear Tolerance factor. Allowances for die wear occuring on forglng measured perpendicular to the fundamental parting line of the dies are included in Die Closure Tolerances Table II.

Flash Extension Tolerances are based on weight of the forging after trimming, and related to the amount of flash extension. Raised to the next highest 0. This document more closely interprets the needed dimensional and tolerance modifications for forgings discussed in this booklet. Straightness Tolerance applied to flat portion. The male portions of dies may, in special situations, tend to mushroom or upset rather than wear.


Weights of Forgings After Trimming, in kilograms. Radii Tolerances relate to all fillet radii and corner radii. This tolerance includes allowances for: Largest Diameter x Die Wear Tolerance factor.

The Tolerance on flat portion is computed first: Over Over 0. This tolerance is in addition to the Die Closure Tolerance. Dressouts, scale pits and other imperfections are tlerance allowed on surfaces to be finish machined unless purchaser’s specification or drawing states otherwise. It is important that forging drawing be accurate and complete. In such cases, the requirements of the forging should be confirmed by purchaser and producer in tolerancs of production.

Die Closure Tolerances are expressed decimal millimeter in units of 0. Over to incl.

Over 50 to incl. Flash is measured from the body of the forging to the trimmed edge of the flash.

Is Die Steel Forging Standard – Free Download PDF

Tolerance on Internal Dimension. Greatest dimension x Straightness Tolerance. Where possible, measurements are made at areas of the forging toleranc by die wear. Theoretical exactness is seldom attained, and it is therefore necessary to make allowance us deviations.

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.


IS 3469-1 to 3: Tolerances for Closed Die Steel Forgings

Flat and thin with protrusion at right angles to the parting line. The Straightness Tolerance on a protrusion is 0. Over 65 to x There are several special ways of providing closer tolerances on selected dimensions on forgings with added operations. Match Tolerances are based on weight of the forging after trimming and are expressed as decimal inch or decimal millimeters according to Table III, below.

Greatest Length mm x Die Wear Tolerance factor.

This tolerance applies only to steps that are contained in one die. Where surfaces of forgings are intended ix use in “as forged” condition, surface imperfections are commonly permitted as shown in Table VI. Radii Tolerances are expressed as decimal millimeter in units of 0.

Die Wear Tolerances for all length, width and diameter dimensions over mm or 30 in.