Beth Wozniak
Analyst · RBC Capital Markets
Thank you, J.C. Good morning, and thank you for joining us. The second quarter marks our first as a public company, and we delivered on all three of our top priorities: To stand up nVent, to deliver organic growth, and to expand Enclosures margin. I'm pleased with our second quarter results, and I'm proud of our team.
We became a public company less than three months ago, and our team put forth tremendous effort to make it successful, all while serving our customers and delivering on our second quarter commitments. Both organic sales and adjusted segment income, excluding corporate and other costs, grew 4% in the quarter. In addition, I hope you saw our announcement on Monday that our board approved our first regular quarterly dividend of $0.175 per share, or $0.70 annualized. We also announced a $500 million share repurchase program over three years. These two items are important components of a broader capital allocation strategy focused on investing in growth and returning excess cash to shareholders. Stacy will touch on this later on the call.
Turning to Page 4 of the presentation, this morning we reported second quarter revenue of $543 million, representing organic sales growth of 4%, which is at the high end of the guidance we provided in April. Sales were driven by strong results from both Enclosures and Electrical and Fastening Solutions, which we call EFS. Return on sales was 19.7%, also at the high end of our previously issued guidance range for the quarter.
Specifically, looking at Enclosures, sequential margin was up 270 basis points, as we continue to make progress toward margin recovery with optimization in our new manufacturing and distribution facilities. Second quarter adjusted earnings per share was $0.44, which was at the high end of our guidance.
Turning to Slide 5, organic growth of 4% was driven by volume and strong price realization, which helped offset increased inflation. Organic growth was broad based, led by the industrial and commercial verticals. Although early, we are already beginning to see benefits from our enterprise-wide growth strategy. Segment income of $107 million grew 1%, in line with our guidance for the quarter. Adjusted segment income, excluding corporate and other costs, grew 4% during the quarter. We believe this is the best way of assessing year-over-year profitability trends throughout the first year, as we are comping allocated corporate and other costs in 2017. We anticipate this to even out by the end of the fourth quarter.
During the quarter, we made significant progress in Enclosures margin, and we still expect margin expansion in the second half of the year. Our price cost improved from the first quarter, with better price realizing $9 million in the second quarter. Year-to-date, we delivered approximately $69 million in free cash flow, which includes $40 million of one-time separation and related costs. We target converting 100% of adjusted net income to free cash flow.
Now let's turn to Slide 6 for an overview of our Enclosures segment. During the first half of the year, I had the opportunity to meet with many of you and discuss our strategy to grow nVent and generate value for our shareholders. I learned during these conversations that it is helpful to review the value proposition for each of our segments, so I'm going to take a couple of minutes to discuss the Enclosure segment in particular.
Our value proposition in Enclosures is simple: We connect and protect critical components and electronics that help to ensure equipment is always running, while also keeping workers safe. We have one of the broadest and most diverse product offerings in this industry that is tailored to meet specific customer needs. Our products meet global regulatory standards and have obtained stringent certifications. We provide both standard products as well as highly engineered solutions to meet a variety of customer requirements, like resistance to tough environmental conditions, size, material type, panel cutouts, cooling capabilities, color, and so much more. Our customers can purchase our products from more than 3,000 distribution points in North America alone, and we are a top 20 supplier to electrical distributors globally.
Within our Enclosures business, we also provide leading thermal management solutions, from air conditioners to high-density liquid cooling solutions that support customers' applications from hazardous plants or environments, to clean data centers. Our global manufacturing presence allows us to meet the demands of many global customers and OEMs that require product and support where they need it. I hope these insights give you a better understanding of our offerings from HOFFMAN and SCHROFF, and how we provide a clear value proposition to the end user.
Now let's turn to Slide 7 for a discussion of second-quarter segment performance, starting with Enclosures. This segment grew approximately 9%, or 7% organically, in the second quarter. We saw broad-based growth that we believe outpaced industry growth of roughly 5%. We continue to see strong growth within our largest vertical, industrial, and are encouraged by a wide range of other verticals contributing to growth. Our previous outlook for the year was for this business to grow 3% to 5% organically. We now expect this business to deliver organic sales growth at the high end of this range for full year 2018. Importantly, we continue to make progress on Enclosures margin. Although return on sales was down 80 basis points year-over-year, we remain on track to see year-over-year improvements during the second half.
Turning to Thermal Management, sales were more or less flat. While organic sales declined 3%, as our longer-cycle energy business continues to lag behind our initial expectations. This was somewhat offset by strong growth in industrial MRO and commercial vertical sales. Our longer-cycle energy business is experiencing strong quoting activity. We believe this business will rebound in the near term, though this is more likely to occur in the fourth quarter. Our Thermal team is launching new products and technology in the back half of this year that should provide additional innovative solutions for our customers. Like the first quarter, Thermal margin was especially strong at 21.9 percent, driven by a heavier mix towards the industrial MRO and commercial sides of the business. While sales have been muted in the first half, it is important to point out that Thermal has delivered strong year-over-year income growth.
Turning to EFS, sales increased 6%, or approximately 5% on an organic basis, with steady, broad-based growth throughout the quarter across multiple verticals. With a couple of price increases this year, the second quarter included a strong contribution from price, which offset inflation. Still, second quarter return on sales contracted 210 basis points, partially driven by a mix shift during the quarter. Our margin did improve sequentially, and we will continue to call for margin expansion for the full year.
That concludes my remarks on the segments, and now I would like to move on to the topic of tariffs, which we have been following closely. Similar to when I spoke about this in April, the situation remains very fluid. We have a team focused on all the developments, and my leadership and I receive regular updates. Specifically on tariffs and counter-tariffs, we analyze the impact based on what we know today and expect it to be roughly $5 million on an annualized basis. This is point-in-time estimate, and we executing on a number of mitigating actions to help offset this impact, such as steel locks, pricing strategies, and identifiable actions within our supply chain.
These indirect impact from these tariff headlines remains in the form of increased inflationary pressure. As you know, steel prices appreciated earlier this year and have remained at elevated levels. We are executing on our mitigation plans, such as the recent price increases in Enclosures and EFS. The situation remains very fluid, but I can tell you we are aggressively reviewing it on an ongoing basis, taking the information and adapting to help alleviate some of this increased inflationary pressure.
During the second half of the year, we believe we have a good line of sight to continue to drive organic sales and expand margins in Enclosures. We also have a keen focus on growth in Thermal, as we believe the longer-cycle energy business can rebound. We have a plan in place to execute on our growth initiatives within key verticals, which we expect to yield more and more to the top line. Our strategy is taking shape, and we are gaining traction in many areas I discussed with you at our February analyst day, including our One nVent vertical and channel growth, geographic, and geographic expansion initiatives.
I would now like to turn the call over to Stacy.