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

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.

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

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

Sheet diagram

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 66 KB

  • About Us

    Irvon, are the United Kingdom’s undisputed leader in steel and stainless steel plate bending and cutting, offering unrivalled capacity and accuracy across the full range of our services.

    We have achieved this through continuous investment in the most advanced machinery and latest technology available. All of our machines are fully cnc controlled and produce parts more consistently accurate than any of our competitors.