MPTA-B4c-2008R 2013
STANDARD SURFACE FINISH for
TRANSMISSION PULLEYS
MPTA Standard
Mechanical Power Transmission Association
5672 Strand Court, Suite 2, Naples, FL 34110
www.mpta.org
MPTA-B4c-2008R 2013 STANDARD SURFACE FINISH for TRANSMISSION PULLEYS
Contributors
B&B Manufacturing, Inc. LaPorte, IN www.bbman.com
Baldor Dodge Maska Greenville, SC www.baldor.com
Carlisle Transportation Products, Inc. Franklin, TN www.carlisletransportationproducts.com
Custom Machine & Tool Co., Inc. Hanover, MA www.cmtco.com
Emerson Industrial Automation Maysville, KY www.powertransmissionsolutions.com
Gates Corporation Denver, CO www.gates.com
Goldens’ Foundry & Machine Co. Columbus, GA www.gfmco.com
Lovejoy, Inc. Downers Grove, IL www.lovejoy-inc.com
Martin Sprocket & Gear, Inc. Arlington, TX www.martinsprocket.com
Maurey Manufacturing Corp. Holly Springs, MS www.maurey.com
TB Wood’s Incorporated Chambersburg, PA www.tbwoods.com
Torque Transmission Fairport Harbor, OH www.torquetrans.com
Veyance Technologies, Inc. Fairlawn, OH www.goodyearep.com/PTP
Goodyear Engineered Products
Disclaimer Statement
This publication is presented for the purpose of providing reference information only.
You should not rely solely on the information contained herein. Mechanical Power
Transmission Association (MPTA) recommends that you consult with appropriate
engineers and /or other professionals for specific needs. Again, this publication is for
reference information only and in no event will MPTA be liable for direct, indirect,
incidental or consequential damages arising from the use of this information.
Abstract
This standard defines the maximum surface finish for transmission pulleys.
Copyright Position Statement
MPTA publications are not copyrighted to encourage their use throughout industry. It is
requested that the MPTA be given recognition when any of this material is copied for
any use.
Mechanical Power Transmission Association
5672 Strand Court, Suite 2, Naples, FL 34110
www.mpta.org
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MPTA-B4c-2008R 2013 STANDARD SURFACE FINISH for TRANSMISSION PULLEYS
Foreword
This foreword is provided for informational purposes only and is not to be construed to
be part of any technical specification.
This standard was updated to the format defined by MPTA-A1. The contributors list
was updated to reflect the current members. No technical revisions were made.
Suggestions for the improvement of, or comments on this publication are welcome.
They should be mailed to Mechanical Power Transmission Association, 5672 Strand
Court, Suite 2, Naples, FL 34110 on your company letterhead.
Scope
This informational bulletin applies to v-groove sheaves, cylindrical (flat) pulleys and
synchronous sprockets.
The machined surface finish of various areas of transmission pulleys shall not be
coarser than the values in Table 1 below:
TABLE 1
Maximum Surface Roughness
Height
Machined Surface Area Ra (Arithmetic Average)
V-Pulley Groove Sidewalls 3.2 Micrometer (125 Microinch)
V-Pulley OD and Rim Edges 6.3 Micrometer (250 Microinch)
Flat Pulley Rim ODs 6.3 Micrometer (250 Microinch)
Trapezoidal Synchronous Pulley Tooth
3.2 Micrometer (125 Microinch)
Flanks and Tips
Curvilinear Synchronous Pulley Tooth
1.6 Micrometer (63 Microinch)
Flanks and Tips
Rim IDs, Hub Ends, Hub ODs As Cast Surface
Bores – Straight and Tapered 3.2 Micrometer (125 Microinch)
* Note: The measuring methods defined in ASME-B46.1 shall be used to determine
these values.
END OF DOCUMENT
Mechanical Power Transmission Association
5672 Strand Court, Suite 2, Naples, FL 34110
www.mpta.org
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