WASHINGTON — New orders for durable goods fell 0.8% in June, the Commerce Department said, signaling that the economy’s strength isn’t unbridled.

June’s decline partially unraveled the huge 4.2% jump in May orders. That gain was just one piece of economic data in the robustly healthy second quarter that caused financial markets to wonder if the economy was in danger of overheating.

But June’s report helped temper that fear a bit. Treasurys ended modestly higher Thursday, with the bellwether 30-year bond rising nearly 3/8 to yield 7.01%.

More than half of the June decline in orders for durable goods, or big-ticket items such …