Conveyor Belting Manufacturing Tolerance Guide
|
|
Manufacturing and fabrication belt tolerances as
specified by NIBA. |
| |
Width Tolerance Table T1
|
| Belt Width (inches) |
Molded Width Tolerance |
Maximum Width Variation In Any one
Belt |
Cut Width 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 Table T2
|
| Endless-Net Endless Length
(NEL) |
Loop Belt |
± 1% |
| Vulcanized |
± 1/2% |
| Specified Length - Cut
Ends |
± 1/2% |
| Specified Length - Laced
with Mechanical Fasteners (measured Pin to Pin) |
± 1/2% |
| 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. |
| |
Gauge - Belt Thickness Tolerances
|
| There are no RMA thickness tolerances established for conveyor
belting because they are often of no consequence. |
| 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 considered binding. |
Gauge Tolerance Guide Table T3
|
| 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% |
|
| |
V-Guide Height (From Cover Surface) Table T4
|
Cleat Height
|
1/4"
or less |
3/8" |
1/2" |
3/4" |
1" |
1-1/2" |
2"
to 4" |
Tolerance |
±.020" |
± .020" |
± .020" |
± .031" |
± .062" |
± .062" |
±
.062" |
|
| |
Standard Cleat Height Tolerance
|
| (From Cover Surface) Table T5 |
| Standard Height |
3/8" |
1/2" |
3/4" |
1" |
1-1/2" |
2" |
3" |
4" |
| Tolerance |
± .020" |
± .020" |
± .031" |
± .062" |
± .062" |
± .062" |
± .062" |
± .062" |
|
| |
Cleat Placement to Succeeding Cleats (C-C) Table
T6
|
| 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" |
|
| |
Cleat Squareness Table T7
|
| Tolerance to Perpendicular Belt
Centerline |
± 1/8" per 12" of cleat
length |
|
| |
V-Guide Tolerance To Belt Centerline Table T8
|
Tolerance to Belt Centerline ±
1/8" |
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