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MARYLAND METRICS

Notes: 1. Triangles,, or R on a drawing indicates peak to valley roughness measurementsin micrometers (microns). (one micron = mm)2., R on a drawing indicates AVERAGE roughness rather than peak to valley values.(R is the unit of measurement in micrometers) the American standard per ASA (average roughness in micro-inches)RzataMail 261, OWINGS MILLS, MARYLAND 21117 Warehouse: 6119 OAKLEAF AVENUE, BALTIMORE, MARYLAND 21215 The one-stop sourcefor all your METRIC HARDWARE needs!filename:SECTION:VERSION: MARYLAND METRICSP hones: (800) 638-1830 (410) 358-3130 FAXes:(800) USA-9-FAX(410) 358-3142=[800-872-9329]PAGE:SURFACE ROUGHNESS guidelines for feasible roughnessfor different processing methodsRaAVERAGE ACHIEVABLEROUGHNESSFINERCOARSERR oughness values in micro-inchesare 40 times the values in micrometersThe data in the right hand table is furnished only for practicalinformation and to provide an idea of the achievable roughnessfor different processing data is primarily for metal surfaces.

Notes:1.Triangles, ,orR onadrawingindicatespeaktovalleyroughnessmeasurements inmicrometers(microns). (onemicron=0.001mm) 2. ,R onadrawingindicatesAVERAGEroughnessratherthanpeaktovalleyvalues.

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Transcription of MARYLAND METRICS

1 Notes: 1. Triangles,, or R on a drawing indicates peak to valley roughness measurementsin micrometers (microns). (one micron = mm)2., R on a drawing indicates AVERAGE roughness rather than peak to valley values.(R is the unit of measurement in micrometers) the American standard per ASA (average roughness in micro-inches)RzataMail 261, OWINGS MILLS, MARYLAND 21117 Warehouse: 6119 OAKLEAF AVENUE, BALTIMORE, MARYLAND 21215 The one-stop sourcefor all your METRIC HARDWARE needs!filename:SECTION:VERSION: MARYLAND METRICSP hones: (800) 638-1830 (410) 358-3130 FAXes:(800) USA-9-FAX(410) 358-3142=[800-872-9329]PAGE:SURFACE ROUGHNESS guidelines for feasible roughnessfor different processing methodsRaAVERAGE ACHIEVABLEROUGHNESSFINERCOARSERR oughness values in micro-inchesare 40 times the values in micrometersThe data in the right hand table is furnished only for practicalinformation and to provide an idea of the achievable roughnessfor different processing data is primarily for metal surfaces.

2 Other materials may symbol (without top line) should not be used the processing method or the surface roughnessshould be listed with it. mIf written as per this example: it meansmachining optional. The surface roughnessshould be ( mm) mSymbol (with top line) means: machining mandatory(surface roughness ). mSymbol (with circle in the vee) means: machiningprohibited (surface roughness ).milled mMETRIC SURFACE ROUGHNESS VALUES ARE INDICATEDBYTHEUNIT: MICROMETER ().SYMBOLS: There are a number of symbols in use, all of which have aspecific meaning. A symbol generally consists of 2 lines, one of whichis longer than the other. The angle between the lines is 60 **Use this symbology on draw-ings for international suppliers,and for new designs.**Old surface roughnesssymbols which are still foundon older metric should not be used onnew of how thenew system is used:In certain circumstances, itwill be necessary toindicate the method ofmanufacturing:Example:N7precision groundMaterial removing orroughness Ra in umseparating cuttingsawingplaningpunchingchemical treatmentspark erosion machiningdrillingboringmillingturningbro achingreamingfilinggrindingbarrelingbrus hingelectrolytic grindinghoningpolishinglappingsuperfinis hingNon materialremoving operationssandcastinghot rollingdie forginggravity die castinginvestment castingextrudingcold rollingdie castingRaNEWOLDAND METRIC COMPARISON CHARTSR oughnessRoughnessOldAmericanmicrometermi cro-inchGrade NumbersGrade NumbersStylestandard(New)**(Old)** () m 1998, 2014 MARYLAND metricskk21


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