General Tolerances

Investment Casting

Size in millimetres
up	to	18	+/-	0.08
18	to	30	+/-	0.12
30	to	45	+/-	0.16
45	to	65	+/-	0.22
65	to	85	+/-	0.29
85	to	105	+/-	0.33
105	to	125	+/-	0.36
125	to	175	+/-	0.42
175	to	200	+/-	0.46
200	to	250	+/-	0.50
250	to	300	+/-	0.54
300	to	350	+/-	0.58
350	to	400	+/-	0.62
400	to	450	+/-	0.66
450	to	500	+/-	0.70
500	to	550	+/-	0.74
550	to	600	+/-	0.78
600	to	650	+/-	0.82
Each additional 25mm, add +/- 0.025mm

 

General Flatnes Tolerance

0.10mm per 25mm up to 130mm

Each additional 25mm add 0.05
Excluding localised pattern undulations

Precision Sand Casting

+/- 0.5mm (0.02") up to 150mm (6")

Thereafter 0.05mm/25mm (0.002"/1")

Size in inches
up	to	0.750	+/-	0.003
0.750	to	1.250	+/-	0.005
1.250	to	1.750	+/-	0.006
1.750	to	2.500	+/-	0.009
2.500	to	3.250	+/-	0.011
3.250	to	4.000	+/-	0.013
4.000	to	5.000	+/-	0.014
5.000	to	7.000	+/-	0.017
7.000	to	8.000	+/-	0.018
8.000	to	10.000	+/-	0.020
10.000	to	12.000	+/-	0.022
12.000	to	14.000	+/-	0.023
14.000	to	16.000	+/-	0.025
16.000	to	18.000	+/-	0.026
18.000	to	20.000	+/-	0.028
20.000	to	22.000	+/-	0.030
22.000	to	24.000	+/-	0.031
24.000	to	26.000	+/-	0.033
Each additional inch, add +/- 0.001 inch

0.004" per inch up to 5 inches

Each additional inch add 0.002"

Gravity Die Casting

+/- 0.4mm (0.15" up to 150mm (6")

Thereafter 0.05mm/25mm (0.002"/1")