|
Conveyor Belting 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 |
|
|
|
 |
