Self-tapping Inserts

SSZS – Screw Studded Zerts

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  • Self-tapping installation in a variety of materials.
  • High pull-out resistance in weak plastics.
  • Suitable for applications where jack-out is unavoidable.
ssz-featured

General

Inch

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

(1) All dimensions are in inches and reference unless toleranced.
(2) Pencom recommends determining the minimum hole wall thickness through testing in the application.

Metric

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 +0.10 -0.00 Thermo– setting +0.10 -0.00
M2 x 0.4 M2 6.00 6.00 4.00-4.10 4.10-4.30 0.58 6.00 4.50
M2.5 x 0.45 M2.5 6.00 6.00 4.00-4.10 4.10-4.30 0.58 6.00 4.50
M3 x 0.5 M3 6.00 6.00 4.50-4.60 4.60-4.80 0.58 6.50 5.00
M3.5 x 0.6 M3.5 8.00 8.00 5.30-5.40 5.50-5.70 0.73 7.50 6.00
M4 x 0.7 M4 8.00 8.00 5.80-5.90 6.00-6.20 0.89 8.00 6.50
M5 x 0.8 M5 10.00 10.00 7.10-7.20 7.30-7.60 1.06 9.50 8.00
M6 x 1.0 M6 14.00 14.00 8.60-8.80 9.00-9.40 1.32 12.00 10.00
M8 x 1.25 M8 15.00 15.00 10.60-10.80 11.00-11.40 1.32 14.00 12.00
M10 x 1.5 M10 18.00 18.00 12.60-12.80 13.00-13.40 1.57 16.00 14.00
M12 x 1.75 M12 22.00 22.00 14.60-14.80 15.00-15.40 1.57 18.00 16.0

(1) All dimensions are in millimeters and reference unless toleranced.
(2) Pencom recommends determining the minimum hole wall thickness through testing in the application.

Stud Length

Inch

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

(1) All dimensions are in inches and reference unless toleranced.
(2) Custom stud lengths available by request.

Metric

Stud Thread Stud Thread Code D Insert Diameter Max. S-Stud Length
5.00 6.00 8.00 10.00 12.00 14.00 16.00 18.00 20.00 25.00
Stud Length Code
M2 x 0.4 M2 4.50 5.00 6.00 8.00
M2.5 x 0.45 M2.5 4.50 5.00 6.00 8.00 10.00
M3 x 0.5 M3 5.00 5.00 6.00 8.00 10.00 12.00
M3.5 x 0.6 M3.5 6.00 5.00 6.00 8.00 10.00 12.00 14.00
M4 x 0.7 M4 6.50 5.00 6.00 8.00 10.00 12.00 14.00 16.00
M5 x 0.8 M5 8.00 5.00 6.00 8.00 10.00 12.00 14.00 16.00 18.00 20.00
M6 x 1.0 M6 10.00 6.00 8.00 10.00 12.00 14.00 16.00 18.00 20.00 25.00
M8 x 1.25 M8 12.00 8.00 10.00 12.00 14.00 16.00 18.00 20.00 25.00
M10 x 1.5 M10 14.00 10.00 12.00 14.00 16.00 18.00 20.00 25.00
M12 x 1.75 M12 16.00 12.00 14.00 16.00 18.00 20.00 25.00

(1) All dimensions are in millimeters and reference unless toleranced.
(2) Custom stud lengths available by request.


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.

ssz-boss-design

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.