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Galvanized Hard Drawn MB Wire

Standard:

ASTM A764
Standard Specification for Metallic Coated Carbon Steel Wire, Coated at Size and Drawn to Size for Mechanical Springs

Chemistry

Element Composition, %
Carbon 0.45-0.85
Manganese 0.30-1.30
Phosphorus, max 0.040
Sulfur, max 0.050
Silicon 0.10-0.35

Tensile Requirements - Finish 1

Finish 1  (Drawn to Size Metallic Coated), Regular or Class 1 Coating (One Class on Coating Type A)

Diameter (Inch) Class I - Tensile Strength KSI Min Class I - Tensile Strength KSI Max Class II - Tensile Strength KSI Min Class II - Tensile Strength KSI Max
0.032 253 306 292 347
0.035 248 301 287 342
0.041 242 293 279 332
0.048 236 286 273 325
0.054 231 279 266 316
0.062 225 272 259 308
0.072 220 266 254 301
0.080 216 261 249 296
0.092 209 253 241 287
0.106 205 248 237 281
0.120 200 241 230 273
0.135 196 237 226 269
0.148 193 234 223 266

Tensile strength values for intermediate diameters may be interpolated.

Permissible Variations in Dimensions Finish 1, Drawn to Size Metallic Coated

Diameter (Inch) Permissible Plus and Minus Permissible Out of Round
0.032 to under 0.076 0.001 0.001
0.076 to 0.148 incl. 0.002 0.002

Tensile Requirements - Finish 2

Finish 2  (Drawn at Size Metallic Coated), Regular or Class 3 Coating (One Class on Coating Type A)

Diameter (Inch) Class I - Tensile Strength KSI Min Class I - Tensile Strength KSI Max Class II - Tensile Strength KSI Min Class II - Tensile Strength KSI Max
0.062 213 272 232 291
0.072 209 266 227 284
0.080 204 261 223 280
0.092 198 253 216 271
0.106 194 248 212 266
0.120 189 241 206 258
0.135 185 237 202 254
0.148 183 234 200 251
0.162 180 230 196 246
0.177 176 225 192 241
0.192 173 221 189 237
0.207 171 218 186 233
0.225 167 214 183 230
0.250 164 210 179 225

Tensile strength values for intermediate diameters may be interpolated.

 

Permissible Variations in Dimensions Finish 2, Metallic Coated at Size

Diameter (Inch) Regular and Class I coating Class 3 coating
0.062 to under 0.076 0.002 0.002
0.076 to 0.250 incl. 0.003 0.004