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Bright Hard Drawn MB Wire

Standard:

ASTM A227
Standard Specification for Steel Wire, Cold-Drawn 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 0.15 - 0.35

Tensile Requirements: Inch-Pound Units

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
0.020 283 323 324 364
0.023 279 319 320 360
0.026 275 315 316 356
0.029 271 311 312 352
0.032 266 306 307 347
0.035 261 301 302 342
0.041 255 293 294 332
0.048 248 286 287 325
0.054 243 279 280 316
0.062 237 272 273 308
0.072 232 266 267 301
0.080 227 261 262 296
0.092 220 253 254 287
0.106 216 248 249 281
0.120 210 241 242 273
0.135 206 237 238 269
0.148 203 234 235 266
0.162 200 230 231 261
0.177 195 225 226 256
0.192 192 221 222 251
0.207 190 218 219 247
0.225 186 214 215 243
0.250 182 210 211 239
0.312 174 200 201 227
0.375 167 193 194 220
0.438 165 190 191 216
0.500 156 180 181 205
0.562 152 176 177 201
0.625 147 170 171 294

Permissible Variations in Wire Diameter

Diameter (Inch) Permissible Plus and Minus Permissible Out of Round
0.020 to 0.028, incl. 0.0008 0.0008
Over 0.028 to 0.075, incl. 0.001 0.001
Over 0.075 to 0.375, incl. 0.002 0.002
Over 0.375 to 0.625, incl. 0.003 0.003