ISO 10684 - Hot Dip Galvanized (HDG) Coatings For Fasteners

Fundamental deviations and upper limits of coating thicknesses for assemblies with nuts tapped oversize
Pitch	Nominal thread diameter	Fundamental deviation				Minimum clearance and maximum coating thickness for thread combinations
P mm	d mm	Internal thread		External thread		AZ/h		AZ/g		AX/h		AX/g
P mm	d mm	AZ µm	AX µm	h µm	g µm	Minimum clearance µm	Maximum coating thickness µm	Minimum clearance µm	Maximum coating thickness µm	Minimum clearance µm	Maximum coating thickness µm	Minimum clearance µm	Maximum coating thickness µm
1.25	8	+325	+255	0	-28	325	81	353	88	255	64	283	71
1.5	10	+330	+310	0	-32	330	83	362	91	310	78	342	86
1.75	12	+335	+365	0	-34	335	84	369	92	365	91	399	100
2	16 (14)	+340	+420	0	-38	340	85	378	95	420	105	458	115
2.5	20 (18, 22)	+350	+530	0	-42	350	88	392	98	530	133	572	143
3	24 (27)	+360	+640	0	-48	360	90	408	102	640	160	688	172
3.5	30 (33)	+370	+750	0	-53	370	93	423	106	750	188	803	201
4	36 (39)	+380	+860	0	-60	380	95	440	110	860	215	920	230
4.5	42 (45)	+390	+970	0	-63	390	98	453	113	970	243	1033	258
5	48 (52)	+400	+1080	0	-71	400	100	471	118	1080	270	1151	288
5.5	56 (60)	+410	+1190	0	-75	410	103	485	121	1190	398	1265	316
6	64	+420	+1300	0	-80	420	105	500	125	1300	325	1380	345

Fundamental deviations and upper limits of coating thicknesses for assemblies with bolts and screws with undersized threads
Pitch	Nominal thread diameter	Fundamental deviation			Minimum clearance and maximum coating thickness for thread combinations
P mm	d mm	External thread	Internal thread		az/h		az/g
P mm	d mm	az µm	H µm	G µm	Minimum clearance µm	Maximum coating thickness µm	Minimum clearance µm	Maximum coating thickness µm
1.25	8	-325	0	+28	325	81	353	88
1.5	10	-330	0	+32	330	83	362	91
1.75	12	-335	0	+34	335	84	369	92
2	16 (14)	-340	0	+38	340	85	378	95
2.5	20 (18, 22)	-350	0	+42	350	88	392	98
3	24 (27)	-360	0	+48	360	90	408	102
3.5	30 (33)	-370	0	+53	370	93	423	106
4	36 (39)	-380	0	+60	380	95	440	110
4.5	42 (45)	-390	0	+63	390	98	453	113
5	48 (52)	-400	0	+71	400	100	471	118
5.5	56 (60)	-410	0	+75	410	103	485	121
6	64	-420	0	+80	420	105	500	125