Thank you, Dave, and good morning, everyone. As Dave highlighted, AMETEK had a very strong first quarter with record level sales and exceptional operating performance, highlighted by strong core margin expansion and free cash flow conversion.
Now let me provide some additional financial highlights for the first quarter. First quarter general and administrative expenses were $26.4 million or 1.5% of sales, in line with last year's first quarter. For fiscal year 2024, general and administrative expenses are expected to be approximately 1.4% of sales.
First quarter interest expense was $35 million, up $15 million from the prior year first quarter due to higher debt balances outstanding following the December 2023 acquisition of Paragon Medical. Other operating expenses were down $5 million primarily due to higher interest income and higher pension income compared to the prior year's first quarter. The effective tax rate was 18.9%, down from 19.5% in the first quarter of 2023. For 2024, we continue to anticipate our effective tax rate to be between 19% and 20%.
As we have stated in the past, actual quarterly tax rates can differ dramatically, either positively or negatively from this full-year estimated rate. Capital expenditures in the first quarter were $28 million, and we continue to expect capital expenditures to be approximately $160 million for the full year or about 2% of sales. Depreciation and amortization expense in the quarter was $98 million. In 2024, we expect depreciation and amortization to be approximately $400 million, including after-tax acquisition-related intangible amortization of approximately $190 million or $0.82 per diluted share.
Operating working capital in the first quarter was 18.7% of sales. Operating cash flow was $410 million, up 6% versus the first quarter of 2023, while free cash flow was $383 million, up 4% over the prior year. For the quarter, free cash flow conversion was a strong 123% of net income. For the remainder of 2024, we continue to expect strong free cash flow conversion in the range of 110% and 120% of net income. Total debt at March 31 was $2.9 billion, down from $3.3 billion at the end of 2023.
Offsetting this debt, it's cash and cash equivalents of $374 million. At the end of the first quarter, our gross debt-to-EBITDA ratio was 1.3x, and our net debt-to-EBITDA ratio was 1.2x. We continue to have excellent financial capacity and flexibility with approximately $1.8 billion of cash and available credit facilities to support our growth initiatives and our active acquisition pipeline.
While acquisitions remain our #1 priority for use of our free cash flow, we also seek to opportunistically repurchase our shares and provide our shareholders with a consistently increasing dividend. And in February, we announced a 12% increase in our quarterly cash dividend to $0.28 per share, our fifth consecutive year of 10% plus annual increases.
In summary, our businesses delivered strong results to start the year with outstanding operating performance, leading to robust core margin expansion and excellent free cash flow.
Kevin?