we experienced a significant drop in orders, especially during the second quarter, and the global economy was plunged into a recession. Although business conditions had improved by late in the third quarter, the effects of the pandemic continued to impact our operations and those of our customers and suppliers. We saw further improvement in the markets we serve in the fourth quarter and recorded sales of $8,265,419 for the quarter compared to $7,645,259 in the previous quarter and $7,186,968 in the fourth quarter of 2019. The increase in sales resulted in an improvement in net income to $464,263, or $0.48 per share, in the fourth quarter of 2020 compared to a net loss of $293,884, or $0.30 per share, in the fourth quarter of 2019. Full year net sales were $27,590,653 in 2020 compared to $32,873,002 in 2019, a decline of $5,282,349, or 16.1%. Full year net income in 2020 was $50,450, or $0.05 per share, compared to $538,314, or $0.56 per share, in 2019.
2020 Compared to 2019
Fastener segment revenues were $7,332,308 in the fourth quarter of 2020 compared to $6,286,948 reported in the relatively weak fourth quarter of 2019, an increase of $1,045,360, or 16.6%. Fastener segment revenues for the full year were $24,607,863 in 2020 compared to $28,989,667 in 2019, a decline of $4,381,804, or 15.1%. The drop in sales in 2020 was primarily related to the COVID-19 pandemic that resulted in shutdowns of business in many parts of the world starting late in the first quarter. Those shutdowns became widespread in the second quarter as different governments struggled to contain the spread of the virus. The automotive sector is the primary market for our fastener segment products and much of that sector was idled for an extended period of time during the second quarter when government-imposed restrictions were the most severe. While sales to automotive customers improved in the fourth quarter of 2020 compared to the prior quarter and the year earlier quarter, such sales declined $2,906,738, or 15.7% for the year. Similarly, sales to non-automotive customers improved in the fourth quarter, but declined $1,475,066, or 14.1%, for the year. The rebound in sales in the fourth quarter, combined with the reduction in certain overhead expenses in the wake of pandemic-related shutdowns, resulted in fastener segment gross margin of $1,638,836 compared to $794,076 in the year earlier quarter, an increase of $844,760. The reduction in sales for the full year was the primary factor impacting gross margins for 2020. For the full year 2020, fastener segment gross margins were $4,170,276 compared to $4,652,353 in 2019, a decline of $482,077.
Assembly equipment segment revenues were $933,111 in the fourth quarter of 2020, compared to $900,020 in the fourth quarter of 2019, an increase of $33,091, or 3.7%. The increase was due to improved machine sales which offset declines in parts and tool sales during the quarter. For the full year 2020, assembly equipment segment revenues were $2,982,790, compared to $3,883,335 reported in 2019, a decline of $900,545, or 23.2%. The year to date decline was primarily due to the broad impact of the COVID-19 pandemic that dramatically reduced demand in the second and third quarters. Gross margins improved in the fourth quarter of 2020 to $255,296 from $90,954 in the fourth quarter of 2019, due in part to 2020 revenue being more heavily weighted toward higher margin machine sales and due to the disposal of certain excess inventory items in 2019. For the full year, assembly equipment segment gross margins declined, along with sales, to $744,926 from $1,092,177.
Selling and administrative expenses were $4,998,216 in 2020 compared to $5,252,946 in 2019, a decline of $254,730, or 4.8%. The decline was primarily due to a $214,000 reduction in salaries and benefits necessitated by the pandemic and a commission expense reduction of $117,000 related to lower sales in 2020. These reductions were partially offset by consulting expenses of $124,000 related to an ERP system conversion that was completed at one of our locations during the year. As a percentage of net sales, selling and administrative expenses were 18.1% in 2020 compared to 16.0% in 2019.
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