Standard Tolerances

At Irvon we take pride in being able to offer the highest standards of accuracy in our products. Through modern production techniques, a high standard of experienced workmanship and exhaustive quality control procedures, we will typically offer the tolerances below.

Shearing

Squareness Tolerance (mm)

THICKNESS DIMENSIONS
<1000 1000+ 5000+ 12000+
<2 2 2 4 6
2+ 2 4 4 6
5+ 2 4 4 6
8+ 4 4 6 8
10+ 4 6 6 8
12+ 6 6 6 8

Dimensional Tolerance (mm)

THICKNESS DIMENSIONS
<1000 1000+ 5000+ 12000+
<2 ± 1 ± 1 ± 1 ± 2
2+ ± 1 ± 1 ± 2 ± 2
5+ ± 1 ± 1 ± 2 ± 2
8+ ± 1 ± 1 ± 2 ± 2
10+ ± 1 ± 1 ± 2 ± 3
12+ ± 1 ± 1 ± 2 ± 3

High Definition & Bevel Cutting Plasma

THICKNESS DIMENSIONS
<1000 1000+ 3000+ 6000+
<5 ± 1 ± 1 ± 1 ± 2
5+ ± 1 ± 1 ± 1 ± 2
10+ ± 1 ± 1 ± 1 ± 2
15+ ± 1 ± 2 ± 2 ± 2
20+ ± 1 ± 2 ± 2 ± 2
25+ ± 2 ± 2 ± 2 ± 2

Plate Rolling

THICKNESS DIAMETER
<1000 1000+ 2000+ 3000+ 4000+
<10 ±3 ±5 ±6* ±8* ±10*
10+ ±3 ±5 ±6 ±8* ±10*
50+ ±5 ±5 ±6 ±8 ±10*
100+ ±5 ±6 ±6 ±8 ±10
150+ ±6 ±8 ±10

Tolerances on plasma cutting are measured on the top edge only. We can offer ±2˚ on all bevel cuts. All lengths measured from bevelled edges will have an additional 1mm added onto the tolerances above. These tolerances apply to full cylinders; tolerances for segments are comparable but are not measured or quoted as “diametric”.

*Parts that are thin relative to their diameter are flexible during handling and transit.

Press-Brake

Our press is the largest and most accurate in the country, rated at 1300 tonnes and able to offer pressings of up to 12.5m. We can therefore offer our customers unique specifications for pressed products. Please enquire for more details. We can control the pressure precisely at six points down the length to give superior tolerances.

THICKNESS LEG LENGTHS (L)1
<1000 1000+ 3000+
<2 ± 1 ± 1 ± 2
2+ ± 1 ± 1.5 ± 2
3+ ± 1 ± 1.5 ± 2
6+ ± 1 ± 1.5 ± 2
8+ ± 1.5 ± 2 ± 2
10+ ± 1.5 ± 2 ± 2.5
15+ ± 1.5 ± 2 ± 2.5
20+ ± 2 ± 2 ± 2.5
25+ ± 2 ± 2 ± 3
30+2 ± 3 ± 3 ± 4
40+2 ± 3 ± 3 ± 4

1. All tolerances for pressed legs apply to dimensions dependent upon, at most, 2 pressed angles. Dimensions in the above table imply a guideline of ±1˚ on angles (α˚)

2. Jobs with a number of folds should be checked with our technical staff to confirm that important or specific tolerances can be adhered to.

This document is intended as an indication of our typical production standards; however the tolerances stated can vary and are dependent upon factors specific to certain jobs. Any tolerance requirements should be confirmed when placing an order.

  • FORM002-Prod-Standard Tolerances Sheet
  • Rev. 2.0
  • 25th September 2012

Please download the PDF showing details of our: Standard Tolerances 66KB

Sheet diagram