Calculation of Upper (es) and Lower (ei) Deviation For Shaft:

The deviations and fundamental tolerances provided by the ISO System. The limits of tolerance for holes or shafts are designated by the appropriate letter indicating the fundamental deviation. And Tolerance grade is dominated by followed by a suffix number. For example, if the hole deviation "H" and tolerance grade IT7,; designation would be H7, if Shaft deviation "k" and tolerance grade IT6; designation would be k6.If the basic size 50mm, tolerance designation would be 50H7 and 50k6.

The Upper and Lower deviations for Shaft are donated by "es" and "ei". The Upper and Lower deviations for Hole are donated by "ES" and "EI". The Fundamental Deviations can be calculated with the help of some formulas given below.

Calculation Fundamental Upper and Lower Deviation Of Shaft:

es=ei+IT,                      ei=es-IT

Calculation Fundamental Upper and Lower Deviation Of Hole:

ES=EI+IT,                     EI=ES-IT

Table Below: Fundamental Upper Deviation For Shaft "a" to "js" (0 mm To 500 mm)

Over	Up to Incl.	FUNDAMENTAL UPPER DEVIATION (es ) IT01 to IT16
		a	b	c	cd	d	e	ef	f	fg	g	h	js
0	3	-270	-140	-60	-34	-20	-14	-10	-6	-4	-2	0	ITn/2
3	6	-270	-140	-70	-46	-30	-20	-14	-10	-6	-4	0	ITn/2
6	10	-280	-150	-80	-56	-40	-25	-18	-13	-8	-5	0	ITn/2
10	14	-290	-150	-95		-50	-32		-16		-6	0	ITn/2
14	18	-290	-150	-95		-50	-32		-16		-6	0	ITn/2
18	24	-300	-160	-110		-65	-40		-20		-7	0	ITn/2
24	30	-300	-160	-110		-65	-40		-20		-7	0	ITn/2
30	40	-310	-170	-120		-80	-50		-25		-9	0	ITn/2
40	50	-320	-180	-130		-80	-50		-25		-9	0	ITn/2
50	65	-340	-190	-140		-100	-60		-30		-10	0	ITn/2
65	80	-360	-200	-150		-100	-60		-30		-10	0	ITn/2
80	100	-380	-220	-170		-120	-72		-36		-12	0	ITn/2
100	120	-410	-240	-180		-120	-72		-36		-12	0	ITn/2
120	140	-460	-260	-200		-145	-85		-43		-14	0	ITn/2
140	160	-520	-280	-210		-145	-85		-43		-14	0	ITn/2
160	180	-580	-310	-230		-145	-85		-43		-14	0	ITn/2
180	200	-660	-340	-240		-170	-100		-50		-15	0	ITn/2
200	225	-740	-380	-260		-170	-100		-50		-15	0	ITn/2
225	250	-820	-420	-280		-170	-100		-50		-15	0	ITn/2
250	280	-920	-480	-300		-190	-110		-56		-17	0	ITn/2
280	315	-1050	-540	-330		-190	-110		-56		-17	0	ITn/2
315	355	-1200	-600	-360		-210	-125		-62		-18	0	ITn/2
355	400	-1350	-680	-400		-210	-125		-62		-18	0	ITn/2
400	450	-1500	-760	-440		-230	-135		-68		-20	0	ITn/2
450	500	-1650	-840	-480		-230	-135		-68		-20	0	ITn/2

Table Below: Fundamental Lower Deviation For Shaft "j" to "zc" (0 mm To 500 mm). Fundamental Deviation IT01 to IT16 for "m" to "zc".

Over	Up to Incl.	FUNDAMENTAL LOWER DEVIATION (ei)
		j5/j6	j7	k4-k7 (incl.)	other k	m	n	p	r	s	t	u	v	x	y	z	za	zb	zc
0	3	-2	-4	0	0	2	4	6	10	14		18		20		26	32	40	60
3	6	-2	-4	1	0	4	8	12	15	19		23		28		35	42	50	80
6	10	-2	-5	1	0	6	10	15	19	23		28		34		42	52	67	97
10	14	-3	-6	1	0	7	12	18	23	28		33		40		50	64	90	130
14	18	-3	-6	1	0	7	12	18	23	28		33	39	45		60	77	108	150
18	24	-3	-8	2	0	8	15	22	28	35		41	47	54	63	73	98	136	188
24	30	-3	-8	2	0	8	15	22	28	35	41	48	55	64	75	88	118	160	218
30	40	-4	-10	2	0	9	17	26	34	43	48	60	68	80	94	112	148	200	274
40	50	-4	-10	2	0	9	17	26	34	43	54	70	81	97	114	136	180	242	325
50	65	-5	-12	2	0	11	20	32	41	53	66	87	102	122	144	172	226	300	405
65	80	-7	-12	2	0	11	20	32	43	59	75	102	120	146	174	210	274	360	480
80	100	-9	-15	3	0	13	23	37	51	71	91	124	146	178	214	258	335	445	585
100	120	-9	-15	3	0	13	23	37	54	79	104	144	172	210	254	310	400	525	690
120	140	-11	-18	3	0	15	27	43	63	92	122	170	202	248	300	365	470	620	800
140	160	-11	-18	3	0	15	27	43	65	100	134	190	228	280	340	415	535	700	900
160	180	-11	-18	3	0	15	27	43	68	108	146	210	252	310	380	465	600	780	1000
180	200	-13	-21	4	0	17	31	50	77	122	166	236	284	350	425	520	670	880	1150
200	225	-13	-21	4	0	17	31	50	80	130	180	258	310	385	470	575	740	960	1250
225	250	-13	-21	4	0	17	31	50	84	140	196	284	340	425	520	640	820	1050	1350
250	280	-16	-26	4	0	20	34	56	94	158	218	315	385	475	580	710	920	1200	1550
280	315	-16	-26	4	0	20	34	56	98	170	240	350	425	525	650	790	1000	1300	1700
315	355	-18	-28	4	0	21	37	62	108	190	268	390	475	590	730	900	1150	1500	1900
355	400	-18	-28	4	0	21	37	62	114	208	294	435	530	660	820	1000	1300	1650	2100
400	450	-20	-32	5	0	23	40	68	126	232	330	490	595	740	920	1100	1450	1850	2400
450	500	-20	-32	5	0	23	40	68	132	252	360	540	660	820	1000	1250	1600	2100	2600

Table Below: Fundamental Upper Deviation For Shaft "d" to js; Lower Deviation For Shaft "k" to "u" (500 mm To 3150 mm)

Over	Up to Incl.	FUNDAMENTAL UPPER DEVIATION (es)								FUNDAMENTAL LOWER DEVIATION (ei)
		d	e	ef	f	fg	g	h	js	k	m	n	p	r	s	t	u
500	560	-260	-145		-76		-22	0	ITn/2	0	26	44	78	150	280	400	600
560	630	-260	-145		-76		-22	0	ITn/2	0	26	44	78	155	310	450	660
630	710	-290	-160		-80		-24	0	ITn/2	0	30	50	88	175	340	500	740
710	800	-290	-160		-80		-24	0	ITn/2	0	30	50	88	185	380	560	840
800	900	-320	-170		-86		-26	0	ITn/2	0	34	56	100	210	430	620	940
900	1000	-320	-170		-86		-26	0	ITn/2	0	34	56	100	220	470	680	1050
1000	1120	-350	-195		-98		-28	0	ITn/2	0	40	66	120	250	520	780	1150
1120	1250	-350	-195		-98		-28	0	ITn/2	0	40	66	120	260	580	840	1300
1250	1400	-390	-220		-110		-30	0	ITn/2	0	48	78	140	300	640	960	1450
1400	1600	-390	-220		-110		-30	0	ITn/2	0	48	78	140	330	720	1050	1600
1600	1800	-430	-240		-120		-32	0	ITn/2	0	58	92	170	370	820	1200	1850
1800	2000	-430	-240		-120		-32	0	ITn/2	0	58	92	170	400	920	1350	2000
2000	2240	-480	-260		-130		-34	0	ITn/2	0	68	110	195	440	1000	1500	2300
2240	2500	-480	-260		-130		-34	0	ITn/2	0	68	110	195	460	1100	1650	2500
2500	2800	-520	-290		-145		-38	0	ITn/2	0	76	135	240	550	1250	1900	2900
2800	3150	-520	-290		-145		-38	0	ITn/2	0	76	135	240	580	1400	2100	3200