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STI Series

Plastic Pipe Plugs for Product Protection, Tubing Inserts
STI Series
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Square Tubing Inserts

Square tubing inserts, otherwise known as STI Series products, are finishing plugs that can be used in a variety of square applications. External tapered ribs ensure a secure fit in a wide range of tubing gauges, and a sleek outer appearance ensures a flawless seam when installed. With square finishing plugs, you can spruce up the style of older furniture pieces, complete unfinished installation work, and keep unsightly interior components hidden from view. Learn more about our stock of these versatile square tubing inserts below.  

  • Color: Black
  • Material: Low Density Polyethylene
  • LDPE service temperature: 150°F (66°C)
  • Some parts are also available with domed and/or other types of top profiles
  • Additional sizes available (consult factory for details)
  • RoHS Compliant
STI Series

Product Options

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PART NO. COLOR TO FIT
TUBE SIZE		 TO FIT
TUBE GAUGE		 TUBE WALL
THICKNESS		 PRODUCT OPTIONS
STI-1/2 16-18 Black 1/2" 16-18 .065 -.049 Carton 10,000 1 1,000 100 408.45 97.30 34.06 1,255
STI-5/8 14-20 Black 5/8" 14-20 .083-.035 Sample 5,000 1 1,000 100 244.13 116.20 40.67 1,256
STI-3/4 14-20 Black 3/4" 14-20 .083-.035 Carton 5,000 1 1,000 100 282.45 188.20 65.86 1,257
STI-7/8 14-20 Black 7/8" 14-20 .083-.035 Sample 3,000 1 1,000 100 217.67 172.60 60.41 1,258
STI-1 10-14 Black 1" 10-14 .134-.083 Carton 2,500 1 1,000 100 184.01 245.40 85.94 1,259
STI-1 14-20 Black 1" 14-20 .083-.035 Carton 2,500 1 1,000 100 184.01 245.40 85.94 1,260
STI-1-1/8 14-20 Black 1 1/8" 14-20 .083-.035 Sample 2,000 1 500 50 249.90 208.25 72.89 1,261
STI-1-1/4 10-14 Black 1 1/4" 10-14 .134-.083 Carton 1,600 1 500 50 204.46 213.25 74.63 1,262
STI-1-1/4 14-20 Black 1 1/4" 14-20 .083-.035 Carton 1,600 1 500 50 204.46 213.25 74.63 1,263
STI-1-3/8 14-20 Black 1 3/8" 14-20 .083-.035 Kit Pack 1,000 1 500 50 378.00 449.90 157.47 1,264
STI-1-1/2 10-14 Black 1 1/2" 10-14 .134-.083 Carton 1,000 1 500 50 210.84 351.50 123.02 1,265
STI-1-1/2 14-20 Black 1 1/2" 14-20 .083-.035 Carton 1,000 1 500 50 210.84 351.50 123.02 1,266
STI-40 MM 14-20 Black 40 mm 14-20 2.0 -1.0 mm Carton 1,000 1 500 50 166.11 276.85 96.90 1,267
STI-1-3/4 10-14 Black 1 3/4" 10-14 .134-.083 Sample 500 1 250 25 143.43 211.73 83.67 1,268
STI-50 MM 11-20 Black 50 mm 11-20 3.2-1.0 mm Carton 500 1 250 25 326.97 544.95 190.73 1,269
STI-2 10-14 Black 2" 10-14 .134-.083 Carton 500 1 250 25 163.91 273.18 95.62 1,270
STI-2 14-20 Black 2" 14-20 .083-.035 Sample 500 1 250 25 163.91 273.18 95.61 1,271
STI-2-3/8 6-10 Black 2 3/8" 6-10 .203-.134 Carton 250 1 100 10 173.46 231.28 80.95 1,272
STI-60 MM 6-11 Black 60 mm 6-11 5.0-3.0 mm Carton 250 1 100 10 168.03 224.04 78.41 1,273
STI-2-1/2 10-14 Black 2 1/2" 10-14 .134-.083 Kit Pack 250 1 100 10 190.97 254.63 89.12 1,274
STI-3 10-14 Black 3" 10-14 .134-.083 Carton 200 1 50 10 205.57 171.31 119.91 1,275
STI-80 MM 5-13 Black 80 mm 5-13 2.5-5.6 mm Carton 125 1 50 5 191.24 267.74 93.71 1,276
STI-3-1/2 6-11 Black 3 1/2" 6-11 .194-.120 Kit Pack 100 1 25 5 195.05 162.54 113.78 1,277
STI-4 7-11 Black 4" 7-11 .179-.120 Carton 108 1 60 5 211.37 391.42 114.16 1,278
STI-5 7-11 Black 5" 7-11 .179-.120 Carton 60 1 25 5 135.16 187.72 131.40 1,279
STI-6 7-11 Black 6" 7-11 .179-.120 Carton 48 1 12 5 223.01 185.84 271.02 1,280

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