Press-in (Free-running) Inserts

TSZS – Thermoset Studded Zerts

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  • Simple press–in installation.
  • Sharp helical knurls broach into thermoset materials to provide high torque–out resistance.
  • Self–aligning design.
  • Available in a wide variety of thread sizes, stud lengths and options.
tsz-featured

General

Inch

Insert Thread Insert Thread Code L Insert Length Insert Length Code Boss A Head Thickness C Head Diameter D Insert Diameter P Pilot Diameter
B Hole Dia. +.004 -.000 W Wall Thickness Min.
2-56 256 .162 162 .122 .063 .020 .187 .131 .117
4-40 440 .208 208 .150 .079 .023 .217 .165 .146
6-32 632 .247 247 .181 .098 .029 .250 .196 .178
8-32 832 .292 292 .213 .098 .035 .281 .228 .209
10-24 1024 .326 326 .244 .098 .042 .312 .259 .241
10-32 1032 .326 326 .244 .098 .042 .312 .259 .241
1/4-20 2520 .362 362 .307 .110 .052 .375 .332 .304
1/4-28 2528 .362 362 .307 .110 .052 .375 .332 .304
5/16-18 3118 .362 362 .366 .150 .052 .437 .383 .365
5/16-24 3124 .362 362 .366 .150 .052 .437 .383 .365
3/8-16 3716 .362 362 .484 .197 .062 .551 .499 .481
3/8-24 3724 .362 362 .484 .197 .062 .551 .499 .481

(1) all dimensions are in inches and reference unless toleranced.

Metric

Insert Thread Insert Thread Code L Insert Length Insert Length Code Boss A Head Thickness C Head Diameter D Insert Diameter P Pilot Diameter
B Hole Dia. +0.10 -0.00 W Wall Thickness Min.
M2 x 0.4 M2 4.10 4.10 3.10 1.60 0.51 4.80 3.30 3.00
M2.5 x 0.45 M2.5 5.30 5.30 3.80 2.00 0.58 5.50 4.20 3.70
M3 x 0.5 M3 5.30 5.30 3.80 2.00 0.58 5.50 4.20 3.70
M3.5 x 0.6 M3.5 6.30 6.30 4.60 2.50 0.74 6.40 5.00 4.50
M4 x 0.7 M4 7.40 7.40 5.40 2.50 0.89 7.10 5.80 5.30
M5 x 0.8 M5 8.30 8.30 6.20 2.50 1.07 7.90 6.60 6.10
M6 x 1.0 M6 9.20 9.20 7.80 2.80 1.32 9.50 8.20 7.70
M8 x 1.25 M8 9.20 9.20 9.30 3.80 1.32 11.10 9.70 9.30
M10 x 1.5 M10 9.20 9.20 12.30 5.00 1.57 14.00 12.70 12.20

(1) all dimensions are in millimeters and reference unless toleranced

Stud Length

Inch

Stud Thread Stud Thread Code D Insert Diameter S – Stud Length
.187 .250 .312 .375 .437 .500 .625 .750 .875 1.000
Stud Length Code
2-56 256 .131 187 250 312
4-40 440 .165 187 250 312 375 437
6-32 632 .196 187 250 312 375 437 500
8-32 832 .228 187 250 312 375 437 500 625
10-24 1024 .259 187 250 312 375 437 500 625 750
10-32 1032 .259 187 250 312 375 437 500 625 750
1/4-20 2520 .332 250 312 375 437 500 625 750 875 1000
1/4-28 2528 .332 250 312 375 437 500 625 750 875 1000
5/16-18 3118 .383 312 375 437 500 625 750 875 1000
5/16-24 3124 .383 312 375 437 500 625 750 875 1000
3/8-16 3716 .499 375 437 500 625 750 875 1000
3/8-24 3724 .499 375 437 500 625 750 875 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 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 3.30 5.00 6.00 8.00
M2.5 x 0.45 M2.5 4.20 5.00 6.00 8.00 10.00
M3 x 0.5 M3 4.20 5.00 6.00 8.00 10.00 12.00
M3.5 x 0.6 M3.5 5.00 5.00 6.00 8.00 10.00 12.00 14.00
M4 x 0.7 M4 5.80 5.00 6.00 8.00 10.00 12.00 14.00 16.00
M5 x 0.8 M5 6.60 5.00 6.00 8.00 10.00 12.00 14.00 16.00 18.00 20.00
M6 x 1.0 M6 8.20 6.00 8.00 10.00 12.00 14.00 16.00 18.00 20.00 25.00
M8 x 1.25 M8 9.70 8.00 10.00 12.00 14.00 16.00 18.00 20.00 25.00
M10 x 1.5 M10 12.70 10.00 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 TSZ Thermoset Zert is designed to be installed into a straight hole with a 1° inclusive taper. The top of the hole should not be countersunk or counterbored as this will decrease the insert’s performance. 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. Minimum boss wall thicknesses shown are for reference and may vary depending on the type of plastic.

tsz-design

Installation

Press the insert into the boss using a squeezing action– never a hammer blow. Allow the insert to rotate in the direction of the knurl during installation by using a punch with either a polished face or thrust bearing. Ensure that the insert maintains axial alignment during installation to prevent tilting which will induce side loads on the boss. Oversize boss holes weaken the insert’s self–aligning characteristics causing side loads which may lead to possible boss cracking.

Performance

tsz-performance
(1) Performance data shown is for reference only. Variations in application, boss material type and size, and installation method will affect the loads. PencoM strongly encourages testing in the application.