ISO Tolerance Grades

The "Screw Length" is used as the "Measured Travel" in the table below to determine the Tolerance for the specified ISO Grade.

Tolerance values on specified travel, for a band width per 300 mm and for a mean travel deviation, and for the standard tolerance grades according to ISO 286-2:1988
Measured Tavel		Standard Tolerance Grade
mm		0	1	3	5	7	10
>	<=	Tolerance
>	<=	µm
-	315	4	6	12	23	52	210
315	400	5	7	13	25	57	230
400	500	6	8	15	27	63	250
500	630	6^a	9	16	32	70	280
630	800	7^a	10	18	36	80	320
800	1000	8^a	11	21	40	90	360
1000	1250	9^a	13	24	47	105	420
1250	1600	11^a	15	29	55	125	500
1600	2000	13^a	18	35	65	150	600
2000	2500	15^a	22	41	78	175	700
2500	3150	18^a	26	50	96	210	860
3150	4000		32^a	62^a	115^a	260^a	1050^a
4000	5000		39^a	76^a	140^a	320^a	1300^a
5000	6300		48^a	92^a	170^a	390^a	1550^a
^aThese values were calculated by linear extrapolation from the IT values in accordance with ISO 286-2 for sizes above 500 mm and less than or equal to 3150 mm.