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Symbols Commonly Used In The World For Surface Roughness

Surface Roughness

Parameters output Surface Roughness measure standard

Bearing Ra R A Arithmetic mean Surface Roughness roughness Ra DIN EN ISO 4287 : 1998

ISO 4287 : 1997

JIS B 0601 : 1994

Rq RQ Root mean square Surface Roughness roughness RQ DIN EN ISO 4287 : 1998

ISO 4287 : 1997

JIS B 0601 : 2001

Rz RZ Average peak valley depth RZ (according to ISO standard) or ry (according to JIS standard) DIN EN ISO 4287 : 1998

ISO 4287 : 1997

Ry ( JIS ) JIS B 0601 : 2001

Equivalent to RZ

Rz ( JIS ) RZJ Average height of profile RZ JIS B 0601 : 2001

(formerly: ISO 4287 / 1: 1984)

Rmax RM A X Large roughness Surface Roughness depth Rmax DIN 4768 : 1990

Rp R P Average contour crest height RP DIN EN ISO 4287 : 1998

ISO 4287 : 1997

Rp ( ASME ) R P Crest height of large profile RP ASME B46

Rpm ( ASME ) R P M Average Surface Roughness contour crest height RP ASME B46

Rpk R P K Reduced peak height RPK DIN EN ISO 13565-2 : 1998

Rk RK Center roughness depth RK DIN EN ISO 13565-2 : 1998

Rvk RVK Reduced trough depth RVK DIN EN ISO 13565-2 : 1998

Mr1 MR 1 Small material rate MR1 of roughness center contour: DIN EN ISO 13565-2 : 1998

The material rate of the intersection line separating the prominent wave Surface Roughness crest from the roughness center contour (unit%).

Mr2 MR 2 Large material rate of Surface Roughness roughness center contour MR2: DIN EN ISO 13565-2 : 1998

The material ratio of the intersection line separating the wave trough from Surface Roughness the roughness center contour in%.

A1 A1 Contour crest range A1 filled with material DIN EN ISO 13565-2 : 1998

(unit) μ m 2 / mm )

A2 A2 Contour trough range A2 filled with lubricant DIN EN ISO 13565-2 : 1998

(unit) μ m 2 / mm )

Bearing plays an important role in social life. Bearing is composed of cage, outer ring, rolling element and inner ring. The components of bearing vary with different bearing types.

Symbols Commonly Used In The World For Surface Roughness

Vo VO Oil content VO (unit: mm3 / cm2)

Rt RT Total height of R profile RT DIN EN ISO 4287 : 1998

R3z R 3 Z Arithmetic mean height between the third peak and valley r3z DB N 31007 : 1983

RPc R PC Peak number RPC EN 10049 : 2005

(depending on intersection C1 and C2): ASME B46

The number of contours per centimeter (or inch) beyond the upper intersection C1 and less than the lower intersection C2 (see RSM).

Rmr RMR Material rate RMR DIN EN ISO 4287 : 1998

(depending on reference line CREF and intersection line C; ISO 4287 : 1997

TP (JIS, ASME) is equivalent to RMR 3 single values (optional) JIS B 0601 : 2001

RSm RSM Average width of profile RSM DIN EN ISO 4287 : 1998

(previously: slot spacing) ISO 4287 : 1997

JIS B 0601 : 2001

S S Average distance s of local contour crest JIS B 0601 : 2001

CR C R Area width CR of contour crest area ISO 4287 : 1997

(French “crit è re de rodage”)

(depending on intersection SCR 1 and SCR 2)

CF C F Area width of contour center area CF 16 ISO 4287 : 1997

(French “crit è re de fonctionnement”)

(depending on intersection scf1 and scf2)

CL C L Width of contour trough CL 16 ISO 4287 : 1997

(French “crit è re de lubrification”)

(depending on intersection scl1 and scl2)

R R Average depth r of roughness waveform ISO 12085 : 1996

(depending on operators a and b)

Ar A R Average width of roughness waveform ar ISO 12085 : 1996

(depending on operators a and b)

Rx RX Large depth RX of contour non-uniformity ISO 1208

(depending on operators a and b)