STI Series
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
Product Options
Please confirm that your Part Number is correct and adjust the other selections below to meet your application's requirements.
Make Your Selection Below
| 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 | 10,000 | 1 |
| STI-5/8 14-20 | Black | 5/8" | 14-20 | .083-.035 | 5,000 | 1 |
| STI-3/4 14-20 | Black | 3/4" | 14-20 | .083-.035 | 5,000 | 1 |
| STI-7/8 14-20 | Black | 7/8" | 14-20 | .083-.035 | 3,000 | 1 |
| STI-1 10-14 | Black | 1" | 10-14 | .134-.083 | 2,500 | 1 |
| STI-1 14-20 | Black | 1" | 14-20 | .083-.035 | 2,500 | 1 |
| STI-1-1/8 14-20 | Black | 1 1/8" | 14-20 | .083-.035 | 2,000 | 1 |
| STI-1-1/4 10-14 | Black | 1 1/4" | 10-14 | .134-.083 | 1,600 | 1 |
| STI-1-1/4 14-20 | Black | 1 1/4" | 14-20 | .083-.035 | 1,600 | 1 |
| STI-1-3/8 14-20 | Black | 1 3/8" | 14-20 | .083-.035 | 1,000 | 1 |
| STI-1-1/2 10-14 | Black | 1 1/2" | 10-14 | .134-.083 | 1,000 | 1 |
| STI-1-1/2 14-20 | Black | 1 1/2" | 14-20 | .083-.035 | 1,000 | 1 |
| STI-40 MM 14-20 | Black | 40 mm | 14-20 | 2.0 -1.0 mm | 1,000 | 1 |
| STI-1-3/4 10-14 | Black | 1 3/4" | 10-14 | .134-.083 | 500 | 1 |
| STI-50 MM 11-20 | Black | 50 mm | 11-20 | 3.2-1.0 mm | 500 | 1 |
| STI-2 10-14 | Black | 2" | 10-14 | .134-.083 | 500 | 1 |
| STI-2 14-20 | Black | 2" | 14-20 | .083-.035 | 500 | 1 |
| STI-2-3/8 6-10 | Black | 2 3/8" | 6-10 | .203-.134 | 250 | 1 |
| STI-60 MM 6-11 | Black | 60 mm | 6-11 | 5.0-3.0 mm | 250 | 1 |
| STI-2-1/2 10-14 | Black | 2 1/2" | 10-14 | .134-.083 | 250 | 1 |
| STI-3 10-14 | Black | 3" | 10-14 | .134-.083 | 200 | 1 |
| STI-80 MM 5-13 | Black | 80 mm | 5-13 | 2.5-5.6 mm | 125 | 1 |
| STI-3-1/2 6-11 | Black | 3 1/2" | 6-11 | .194-.120 | 100 | 1 |
| STI-4 7-11 | Black | 4" | 7-11 | .179-.120 | 108 | 1 |
| STI-5 7-11 | Black | 5" | 7-11 | .179-.120 | 60 | 1 |
| STI-6 7-11 | Black | 6" | 7-11 | .179-.120 | 48 | 1 |
More Options
Tapered Plugs
Tapered Series
Pull Ring Plugs
PR Series
Pull Plugs
P Series
Electrical Connector Plugs
YP Series
Sheet Metal Plugs
F&R Series
Flared Fitting Plugs
FP Series
Flat Fitting Plugs for ORFS Fittings
FFP Series
Push In Plugs
PI Series
Universal Plugs
UP Series
Threaded Hydraulic Plugs
HP Series
Long Threaded Hydraulic Plugs
HPL Series
Heavy Duty Long Threaded Hydraulic Plugs
HPL Nylon Series
Silicone Rubber Plugs
SLP Series
Silicone Pull Plugs
SLPP Series
Silicone Flangeless Plugs
SFP Series
Dual Washer Pull Plugs
DWPP Series
Dual Silicone Washer Plugs
DSWP Series
Silicone Dual Plugs
SDP Series
Silicone Flanged Pull Plugs
SFPP Series
Silicone Flanged Masking Plugs
SFMP Series
Silicone Multi-Flanged Plugs
SMFP Series
Silicone Mouse Tail Plugs
SMTP Series
Silicone Hollow Tapered Plugs
SHTP Series
Silicone Hollow Tapered Plugs with Pull Tabs
SHPT Series
Silicone Flanged Plugs
SLFP Series
Silicone Thick Flanged Plugs
STFP Series
Silicone Washer Pull Plugs
SWPP Series
Silicone Plugs with Pull Tabs
SPPT Series
Round Tubing Inserts
RTI Series
Rectangular Tubing Inserts
REC Series