339991

Analysis

NAICS 339991 is the 2022 national industry for gasket, packing, and sealing device manufacturing, part of 33999 (All Other Miscellaneous Manufacturing). Census lists 8 example activities under it in the official index.

Between 2018 and 2023 the number of establishments fell 36% and employment fell 20%. The 2018 count used NAICS 2017, so part of a large move can come from codes being redefined rather than from businesses opening or closing.

County Business Patterns counts 620 US establishments in this code in 2023, employing 32,313 people at an average annual payroll of $73,800 per employee (59th percentile of national industries). 25% of the establishments have fewer than five employees, which points to larger operations.

Its index entries, the activities Census uses to assign businesses to this code, include coaxial mechanical face seals manufacturing, compression packings manufacturing, gasket, packing, and sealing devices manufacturing and gaskets manufacturing, among 8 in all.

Its goods appear in 14 statistical lines of the US tariff schedule, mostly under headings 4016 (other articles of vulcanized rubber other than hard rubber), 8484 (gaskets and similar joints of metal sheeting combined with…) and 3926 (other articles of plastics and articles of other materials…). That link is how import data is matched to domestic producers, for example in trade-remedy cases.