S Series: Symmetrical Threaded Inserts for Plastics
Say goodbye to expensive part orientation high-volume feeding mechanisms. Our symmetrical threaded inserts for plastic can be installed either end first for faster installation (using ultrasonic or thermal equipment) and lower costs.
By decreasing outward hoop stress, symmetrical threaded inserts decrease cycle times. Their proportionally engineered design ensures that the displaced material is encapsulated by knurls and undercuts. They are designed for straight hole applications and are ideal for thin-wall applications because little stress is applied to the walls of the part.
Recommended Hole Size – See chart below for installation hole size. Additional information can be found in our Design Guidelines.
| SYMMETRICAL THREADED INSERTS | ||||||||||
| INCH | METRIC | A ±.004 |
B ±.004 |
C ±.004 |
Hole H +.003 -.000 |
Min. Boss |
||||
| Thread Size |
Part Number |
Thread Size |
Part Number |
|||||||
| 2-56 | 256X115S† | M2.0 x 0.4 | M20X115S† | .123 | .115 | .138 | .126 | .252 | ||
| 256X157S | M2.0 x 0.4 | M20X157S | .123 | .157 | .138 | .126 | .252 | |||
| 4-40 | 440X226S | M2.5 x 0.45 | M25X226S | .154 | .226 | .175 | .157 | .314 | ||
| M3.0 x 0.5 | M30X226S | .154 | .226 | .175 | .157 | .314 | ||||
| 6-32 | 632X281S | M3.5 x 0.6 | M35X281S | .185 | .281 | .206 | .188 | .376 | ||
| 8-32 | 832X321S | M4.0 x 0.7 | M40X321S | .218 | .321 | .239 | .221 | .442 | ||
| 10-24 | 1024X375S | M5.0 x 0.8 | M50X375S | .249 | .375 | .270 | .252 | .504 | ||
| 10-32 | 1032X375S | .249 | .375 | .270 | .252 | .504 | ||||
| 1/4-20 | 2520X500S | M6.0 x 1.0 | M60X500S | .312 | .500 | .333 | .315 | .630 | ||
| 1/4-28 | 2528X500S† | .312 | .500 | .333 | .315 | .630 | ||||
| 5/16-18 | 3118X500S | M8.0 x 1.25 | M80X500S | .374 | .500 | .393 | .377 | .754 | ||
| 5/16-24 | 3124X500S† | .374 | .500 | .393 | .377 | .754 | ||||
| 3/8-16 | 3816X500S† | M10.0 x 1.5 | M100X500S† | .465 | .500 | .484 | .468 | .936 | ||
| 3/8-24 | 3824X500S† | .465 | .500 | .484 | .468 | .936 | ||||
† Non-Stocking Item – Minimum Order May Apply
Stainless Steel Symettrical Inserts – Class 3A/4H screw must pass with finger torque, standard class go gage may stop on last thread.
Part numbers for Stainless Steel Inserts are the same as listed in the chart, but ending with -SS.