| Part Desc. | Thread | Insert Length | Stud Length | Material | |
|---|
General
| Insert Thread | Insert Thread Code | L Insert Length | Insert Length Code | Boss Hole Dia. B | A Head Thickness | C Head Diameter | D Insert Diameter Max. |
|---|
| Thermo– plastics +.004 -.000 | Thermo– setting +.004 -.000 |
|---|
| 2-56 | 256 | .236 | 236 | .157-.161 | .161-.169 | .023 | .236 | .177 |
| 4-40 | 440 | .236 | 236 | .157-.161 | .161-.169 | .023 | .236 | .177 |
| 6-32 | 632 | .315 | 315 | .209-.213 | .217-.224 | .029 | .295 | .236 |
| 8-32 | 832 | .315 | 315 | .228-.232 | .236-.244 | .035 | .312 | .256 |
| 10-24 | 1024 | .394 | 394 | .280-.283 | .287-.299 | .042 | .374 | .315 |
| 10-32 | 1032 | .394 | 394 | .280-.283 | .287-.299 | .042 | .374 | .315 |
| 1/4-20 | 2520 | .551 | 551 | .339-.346 | .354-.370 | .052 | .472 | .394 |
| 1/4-28 | 2528 | .551 | 551 | .339-.346 | .354-.370 | .052 | .472 | .394 |
| 5/16-18 | 3118 | .591 | 591 | .417-.425 | .433-.449 | .052 | .551 | .472 |
| 5/16-24 | 3124 | .591 | 591 | .417-.425 | .433-.449 | .052 | .551 | .472 |
| 3/8-16 | 3716 | .709 | 709 | .496-.504 | .512-.528 | .062 | .630 | .551 |
| 3/8-24 | 3724 | .709 | 709 | .496-.504 | .512-.528 | .062 | .630 | .551 |
| 1/2-13 | 5013 | .866 | 866 | .575-.583 | .591-.606 | .062 | .709 | .630 |
| 1/2-20 | 5020 | .866 | 866 | .575-.583 | .591-.606 | .062 | .709 | .630 |
Stud Length
| Stud Thread | Stud Thread Code | D Insert Diameter Max. | S-Stud Length |
|---|
| .187 | .250 | .312 | .375 | .437 | .500 | .625 | .750 | .875 | 1.000 |
|---|
| Stud Length Code |
|---|
| 2-56 | 256 | .177 | 187 | 250 | 312 | — | — | — | — | — | — | — |
| 4-40 | 440 | .177 | 187 | 250 | 312 | 375 | 437 | — | — | — | — | — |
| 6-32 | 632 | .236 | 187 | 250 | 312 | 375 | 437 | 500 | — | — | — | — |
| 8-32 | 832 | .256 | 187 | 250 | 312 | 375 | 437 | 500 | 625 | — | — | — |
| 10-24 | 1024 | .315 | 187 | 250 | 312 | 375 | 437 | 500 | 625 | 750 | — | — |
| 10-32 | 1032 | .315 | 187 | 250 | 312 | 375 | 437 | 500 | 625 | 750 | — | — |
| 1/4-20 | 2520 | .394 | — | 250 | 312 | 375 | 437 | 500 | 625 | 750 | 875 | 1000 |
| 1/4-28 | 2528 | .394 | — | 250 | 312 | 375 | 437 | 500 | 625 | 750 | 875 | 1000 |
| 5/16-18 | 3118 | .472 | — | — | 312 | 375 | 437 | 500 | 625 | 750 | 875 | 1000 |
| 5/16-24 | 3124 | .472 | — | — | 312 | 375 | 437 | 500 | 625 | 750 | 875 | 1000 |
| 3/8-16 | 3716 | .551 | — | — | — | 375 | 437 | 500 | 625 | 750 | 875 | 1000 |
| 3/8-24 | 3724 | .551 | — | — | — | 375 | 437 | 500 | 625 | 750 | 875 | 1000 |
| 1/2-13 | 5013 | .630 | — | — | — | — | — | 500 | 625 | 750 | 875 | 1000 |
| 1/2-20 | 5020 | .630 | — | — | — | — | — | 500 | 625 | 750 | 875 | 1000 |
Boss Design Recommendation
The SSZ Screw Zert is designed to be installed into a straight hole with a 1°inclusive taper. The recommended hole size applies at the point reached by the bottom of the insert. Molded holes should be used wherever possible as drilled holes may result in diminished performance. PENCOM recommends a 60°countersink, with a depth equal to the external thread pitch of the insert being used, at the top of the hole to prevent chipping of the surrounding boss hole surface. Hole diameters are dependant on the type of plastic being used with harder plastics requiring larger holes than softer plastics, for example. Diameter ranges shown in the tables are those recommended for thermoplastics and thermosetting plastics with the exact hole size determined through testing in the application.Installation
The slot in the insert acts as a thread cutting edge. Inserts are installed following standard tapping procedures using hand tools or conventional tapping equipment.
