Ken Giacobbe
Executive Vice President and Chief Financial Officer at Howmet Aerospace
Thank you, John. Please move to Slide 5 for an overview of the markets. Revenue was up 18% year-over-year for the fourth quarter and up 14% for the full year. The Commercial Aerospace recovery continued throughout 2022 with fourth quarter Commercial Aerospace revenue up 29% year-over-year and up 28% for the full year, driven by Engine Products, Engineered Structures and the Narrow Body Recovery. Commercial Aerospace has grown for seven consecutive quarter and stands at 48% of total revenue, but continues to be short of the pre-COVID level, which was 60% of total revenue.
Defense Aerospace was up 13% in the fourth quarter, driven by year end seasonality and down 3% for the full year, driven by customer inventory corrections for the F-35. Commercial transportation, which impacts Forged Wheels and Fastening Systems was up 12% year-over-year in the fourth quarter and up 14% for the full year, driven by higher aluminum prices and higher volumes, partially offset by foreign currency.
Finally, the industrial and other markets, which is composed of IGT, oil and gas and general industrial was essentially flat for the fourth quarter and for the year. For the fourth quarter within the industrials and other markets, oil and gas was up 22%, IGT was up 2% and general industrial was down 10% on a year-over-year basis.
Now let's move to Slide 6. We will start with the P&L with the focus on enhanced profitability. For the fourth quarter, we had six consecutive quarters of growth in revenue, EBITDA and earnings per share. Revenue, EBITDA and earnings per share exceeded or were in line with guidance. For the full year, revenue was up 9% year-over-year, excluding material pass through of approximately $225 million. EBITDA was $1.28 billion or up 12% year-over-year. Adjusting for the year-over-year material pass-through, EBITDA margin was 23.5% and flow through of incremental revenue to EBITDA was strong at approximately 30%.
Full year operating tax rate was 22.5%, an improvement of 250 basis points year-over-year. Earnings per share was $1.40 for the year and up 39% year-over-year. The average diluted share count improved to a Q4 exit rate of 418 million shares.
As John mentioned, the strong operating EBITDA and favorable tax rate in the fourth quarter are mitigated by a few items below the line. The impact of foreign currency and deferred comp was $9 million pre-tax charge as these items fluctuate based on market conditions. For the year, the impact of foreign currency was essentially break-even and deferred comp was favorable.
Final note on earnings, as expected, we did not have significant net headcount additions in the fourth quarter. However, we hired approximately 1,000 new employees to offset Q4 attrition and absorbed incremental training and production costs.
Moving to the balance sheet. Free cash flow for the year was a record $540 million, including an inventory build of approximately $235 million primarily for the Commercial Aerospace recovery. For 2022, as well as in every year since separation, we achieved free cash flow conversion of net income in excess of our long-term target of 90%. Year end cash balance was a healthy $792 million after approximately $513 million of capital allocation to common stock repurchases, 2024 bond repurchases and the quarterly dividends.
Year-over-year, net pension and OPEB liabilities were reduced by approximately $180 million and cash contributions were reduced by approximately 50% or $56 million. Since 2019 net pension and OPEB liabilities have been reduced by approximately $470 million and gross pension and OPEB liabilities by approximately $1.4 billion. Net pension and OPEB liabilities now stand at less than 5% of Howmet's market capitalization. Finally, net debt to EBITDA improved to a record low of 2.6 times, all bond debt is unsecured in at fixed rates, which will provide stability of interest rate expense in the future. Our next bond maturity is in October of 2024 and the $1 billion revolver is undrawn.
Moving to capital allocation. We continue to be balanced in our approach. Capital expenditures were $193 million for the year and we're approximately 75% of depreciation. Capital installed prior to COVID-19 puts us in a very strong position to support the expected Commercial Aerospace growth. Fourth quarter was the seventh consecutive quarter of common stock repurchases. For the year, we repurchased approximately 11.4 million shares of common stock for $400 million with an average acquisition price of $35.22 per share. Share buyback authority stands at $947 million.
Moving to debt. We repurchased $69 million of our 2024 bonds last year with cash on hand. These repurchases will lower our annualized interest cost by approximately $4 million. Moreover, we continued to repurchase 2024 bonds in January with another $26 million of repurchases at a slight discount to par. Repurchases were made with cash on hand. Lastly, we continue to be confident in free cash flow. In the fourth quarter, the quarterly common stock dividend was doubled to $0.04 per share. Dividends in 2022 were $44 million and we expect to increase to approximately $68 million in 2023.
Let's move to Slide 7 now to cover the segment results. Q4 was another solid quarter for Engine Products. Year-over-year revenue was 21% higher in the fourth quarter with Commercial Aerospace up 30%, driven by the Narrow Body Recovery. Defense Aerospace was up 17%, IGT was up 2% and oil and gas was up 19%. EBITDA increased 26% year-over-year and margin improved 110 basis points to 26.1% despite the addition of new employees and the associated near-term training and production costs.
Let's move to Slide 8. Fastening Systems year-over-year revenue was 11% higher in the fourth quarter. Commercial Aerospace was 17% higher, driven by the Narrow Body Recovery. Defense Aerospace was up 21% and Industrial was down 13%. Year-over-year segment EBITDA decreased 3% due to the addition of new employees and the near-term training and production cost. In the fourth quarter, Fasteners added approximately 200 new hires to offset 200 exits.
Now let's move to Slide 9. Engineered Structures year-over-year revenue was up 21% in the fourth quarter, with commercial aerospace up 40%, driven by the Narrow Body Recovery plus approximately $20 million of Russian titanium share gain. Gains were partially offset by the impact of production declines for the Boeing 787. Segment EBITDA increased 10% year-over-year despite the inventory burn down of the F-35, and the continued zero to low build of the Boeing 787. Structures 2022 full year EBITDA margin was 14.1%, and was on par with 2019 levels when revenue was 37% higher.
Finally, let's move to Slide 10. Forged Wheels year-over-year revenue was 14% higher in the fourth quarter. The $32 million increase in revenue year-over-year was almost entirely driven by higher aluminum prices. Commercial transportation demand remained strong, but volumes continue to be impacted by customer supply chain issues, limiting commercial truck production. Segment EBITDA was flat year-over-year as higher volumes were offset by the impact of unfavorable foreign currency, and primarily driven by the euro. While the pass-through of higher aluminum prices did not impact EBITDA dollars, it did impact margin by approximately 300 basis points.
Lastly, in the appendix on Slide 15, we've included some assumptions around 2023. We expect non-service pension and OPEB expense to increase approximately $20 million year-over-year to approximately $40 million. The increase will unfavorably impact year-over-year earnings per share by approximately $0.04 per share and is mainly due to low asset returns impacting non-service costs, which are non-cash.
In addition to the increase in pension expense of $20 million, we continue to expect miscellaneous other expenses, which are below the line to be minimal at approximately $8 million for the year, but can be volatile within quarters. Pension and OPEB cash contributions are expected to be flat with 2022 and approximately $56 million for the year. Capex should be in the range of $230 million to $260 million, which continues to be less in depreciation and amortization, resulting in a net source of cash.
Now let me turn it back over to John.