The InterWire Group · 355 Main Street · Armonk NY 10504
800-699-6633

Oil Tempered MB Class I & II

Standard:

ASTM A229
Standard Specification for Steel Wire, Oil Tempered for Mechanical Springs

Chemistry:

Element Composition, %
Carbon 0.55-0.85
Manganese 0.30-1.20
Phosphorus, max 0.040
Sulfur, max 0.050
Silicon 0.15-0.35

 

Tensile Requirements: Inch-Pound Units

  CLASS I   CLASS II  
Diameter (Inch) Tensile Strength KSI Min Tensile Strength KSI Max Tensile Strength KSI Min Tensile Strength KSI Max
0.020 293 323 324 354
0.023 289 319 320 350
0.026 286 316 317 347
0.029 283 313 314 344
0.032 280 310 311 341
0.035 274 304 305 335
0.041 266 296 297 327
0.048 259 289 290 320
0.054 253 283 284 314
0.062 247 277 278 308
0.072 241 271 272 302
0.080 235 265 266 296
0.092 230 260 261 291
0.106 225 255 256 286
0.120 220 250 251 281
0.135 215 240 241 266
0.148 210 235 236 261
0.162 205 230 231 256
0.177 200 225 226 251
0.192 195 220 221 246
0.207 190 215 216 241
0.225 188 213 214 239
0.244 187 212 213 238
0.250 185 210 211 236
0.312 183 208 209 234
0.375 180 205 206 231
0.438 175 200 201 226
0.500 170 195 196 221
0.562 165 190 191 216
0.625 165 190 191 216

 

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

 

The above notes are intended to provide general information about product specifications. Please contact InterWire so that our expert staff can provide more detailed product specifications and work with you to find the best products for your requirements.