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Tolerances: Guide To Standard Industry Tolerances

This document provides standard tolerances for various dimensions of conveyor belts and sheet rubber. It specifies tolerances for belt width, length, thickness, cleat height and spacing. It also lists tolerances for sheet rubber thickness and width. Tolerances allow for minor variations in manufactured parts to ensure proper functionality while accounting for normal production variability.

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406 views2 pages

Tolerances: Guide To Standard Industry Tolerances

This document provides standard tolerances for various dimensions of conveyor belts and sheet rubber. It specifies tolerances for belt width, length, thickness, cleat height and spacing. It also lists tolerances for sheet rubber thickness and width. Tolerances allow for minor variations in manufactured parts to ensure proper functionality while accounting for normal production variability.

Uploaded by

pk cfctk
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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800.234.2358 | www.conveyorbelt.

com

TOLERANCES

GUIDE TO STANDARD INDUSTRY TOLERANCES


BELT TOLERANCES

Manufacturing and fabrication belt tolerances as specified by NIBA.

Width Tolerance
Belt Width Molded Width Maximum Width Cut Width
(inches) Tolerance Variation In Any one Belt Tolerance
24 or less ± 1/4" ± 1/4" ± 1/8"
25 to 36 ± 3/8" ± 3/8" ± 3/16"
37 to 48 ± 1/2" ± 1/2" ± 1/4"
49 to 53 ± 7/32" ± 7/32" ± 7/64"
54 to 59 ± 19/32" ± 19/32" ± 19/64"
60 to 71 ± 23/32" ± 23/32" ± 23/64"
72 to 78 ± 25/32" ± 25/32" ± 25/64"
79 to 84 ± 27/32" ± 27/32" ± 27/64"
85 to 90 ± 29/32" ± 29/32" ± 29/64"
91 and over ± 1% ± 1% ± 1/2%

Length Tolerance
Loop Belt ± 1%
Endless-Net Endless Length (NEL)
Vulcanized ± 1/2%
Specified Length - Cut Ends ± 1/2%
Specified Length - Laced with Mechanical Fasten- ± 1/2%
ers (measured Pin to Pin)
Roll - Bulk Quantities ± 10%

* On Specified Lengths the manufacturer will often cut belt 2% longer than specified to avoid shipping short.

**Belts may be shipped in one, two, or three pieces - none less than 50 feet unless agreed to by customer.
BELT TOLERANCES

Gauge - Belt Thickness Tolerances

There are no RMA thickness tolerances established for conveyor belting because they are often of no con-
sequence. The following standards are for guides if thickness is determined to be important and declared
at time of order for make-up conditions. These values are generally reasonable, but tighter tolerances may
be negotiated. NOTE: Thickness tolerances must be specified on purchase orders if they are to be consid-
ered binding.

Gauge Tolerance Guide


Overall Belt Thickness Tolerance
Zero - 0.094" (3/32") ± 0.015" (1/64")
0.095" - 0.156" (5/32") ± 0.020"
0.157" - 0.344" (11/32") ± 0.031" (1/32")
0.345" - 0.500" (1/2") ± 0.047" (3/64")
0.501" and Over ± 10%

CLEAT TOLERANCES

Cleat height tolerances


Standard
3/8" 1/2" 3/4" 1"" 1-1/2" 2" 3" 4"
Height
Tolerance ± .020" ± .020" ± .031" ± .062" ± .062" ± .062" ± .062" ± .062"

Cleat Spacing Tolerances


Cleat Spacing Center-To-Center Tolerance
2" to 8" ± 1/4"
9" to 12" ± 5/16"
14" to 24" ± 7/16"
25" to 60" ± 1/2"

SHEET RUBBER TOLERANCES

Sheet Rubber Thickness Tolerances


Standard 1” &
1/32” 1/16” 1/8” 3/16” 3/8” 9/16” 3/4”
Thickness Greater
Tolerance ± .012" ± .016" ± .020" ± .031" ± .047" ± .063" ± .093" ± 10%

Sheet Rubber Width Tolerance


Width Tolerance
Cut Widths ± 5%
4” ± 13/64”
6” ± 5/16”
8” ± 13/32”
10” ± 1/2”
12” ± 39/64””
36” & Greater ± 1”

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