Wire diameter (mm)	Hard steel wire			High strength hard steel wire	Piano wire
Wire diameter (mm)	Type A	Type B	Type C	High strength hard steel wire	Type 1	Type 2
0.32	175~205	205~235	235~265	265~290	245~270	270~295
0.35	"	"	"	"	"	"
0.40	170~200	200~230	230~260	260~285	240~265	265~290
0.45	165~195	195~225	225~255	255~280	235~260	260~285
0.50	"	"	"	"	"	"
0.55	160~190	190~220	220~250	250~275	230~255	255~280
0.60	160~185	185~215	215~245	245~270	225~250	250~275
0.65	"	"	"	240~265	"	"
0.70	155~180	180~210	210~240	"	220~245	245~270
0.80	"	180~205	205~235	235~260	215~240	240~265
0.90	"	"	205~230	230~255	215~235	235~255
1.00	150~175	175~200	200~225	225~245	210~230	230~250
1.20	145~170	170~195	195~220	220~240	205~225	225
1.40	140~165	165~190	190~215	215~235	200~220	220~240
1.60	135~160	160~185	185~210	210~230	195~215	215~235
1.80	130~155	155~180	180~205	205~225	190~210	210~230
2.00	130~150	150~175	175~200	200~220	185~205	205~225
2.30	125~145	145~170	170~195	195~215	180~200	200~220
2.60	"	"	"	190~210	"	"
2.70	120~140	140~165	165~190	"	175~195	195~215
2.90	"	"	"	185~205	"	"
3.20	"	140~160	160~185	"	170~190	190~210
3.50	"	"	160~180	180~200	170~185	185~200
4.00	"	"	"	175~195	"	"
4.50	115~135	135~155	155~175	"	165~180	180~195
5.00	"	"	"	170~190	"	"
5.50	110~130	130~150	150~170	165~180	160~175	175~190
6.00	105~125	125~145	145~165	160~175	155~170	170~185
6.50	"	"	"	155~170	"	"
7.00	100~120	120~140	140~160	150~165	150~165	165~180
8.00	"	"	"	155~170	"	―
9.00	95~115	115~135	135~155	150~165	145~160	―
10.0	"	"	"	145~160	"	―
11.0	―	110~130	130~150	―	―	―
12.0	―	"	"	―	―	―
13.0	―	105~125	125~145	―	―	―

Wire diameter (mm)	Permissible tolerance		Diametrical variation
	Hard steel wire (High strength hard steel wire)	Piano wire	Hard steel wire (High strength hard steel wire)	Piano wire
	KS	KS	KS	KS
0.32~0.50	±0.015	±0.008	Not defined	0.008
0.50~1.00	±0.020	±0.010	"	0.010
1.00~2.00	±0.030	±0.015	"	0.015
2.00~2.30	±0.040	±0.020	"	0.020
2.30~3.20	"	"	"	"
3.20~3.70	±0.050	±0.030	"	0.030
3.70~4.50	"	"	"	"
4.50~5.50	"	"	"	"
5.50~8.50	±0.060	±0.040	"	0.040
8.50~9.00	"	±0.050	"	0.050
9.00	"	"	"	"

Classification	Wire diameter (mm)	High strength hard steel wire	Piano wire
Classification	Wire diameter (mm)	KS	KS
The number of twists	~0.70	More than 20 times	―
	0.70~2.00	"	More than 25 times
	2.00~3.50	More than 15 times	More than 20 times
	3.50~6.00	More than 10 times	More than 15 times

Classification	High strength hard steel wire	Piano wire
Classification	KS	KS
Condition of fracture plane	The primary fracture plane should be perpendicular to a line shaft and have no serious flaw or crack and the secondary fracture plane should not be considered.	It should be perpendicular to a line shaft and have no dividedness.
Condition of twisting	It should have no serious longitudinal crack, fault and local twisting.	It should be even across the entire length and have no groove or local twisting and not be a significant spiral form.
Condition of decarburized layer	-	A harmful decarburized layer should not be found.