Sigma Tool & Machine
Quality T-nuts and T-nut Insertion Machines

Sigma Tool & Machine has been manufacturing and supplying quality t-nuts, t-nut insertion equipment and furniture clips for the upholstered furniture industry for over 50 years.

Sigma introduced and patented the first 4 prong t-nuts with the now familiar 8-sided base. This style of t-nut was specifically designed to be fed efficiently and reliably by machine. The 8-sided base has now become the standard configuration for machine driven t-nuts. .

Today Sigma manufactures and supplies many variations of t-nuts. The popular ultragrip t-nuts and rivet t-nuts are produced in a wide variety of sizes and finishes and with options such as collating and torqloc, can be configured to suit virtually any application.

Sigma t-nut machines are custom designed for use with Sigma T-Nuts. While our machines are designed to meet the needs of the most demanding applications, we also build custom insertion equipment.

Sigma also manufactures a variety of furniture clips.

Every Sigma Product is manufactured with the exceptional quality that our customers have come to expect. and deserve.

Sigma Tool and Machine is ISO 9001:2000 Registered


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