These T-bolts, sometimes called tank-strap bolts, are frequently used to secure fuel tanks and other items in place when combined with a strap or band clamp. For constant tightening, the broad T-shaped head offers a firm grip. 

These bolts, often called clamping pins, can be welded into place to hold work in place and avoid overtightening. They feature a collar that moves along the shaft. For constant tightening, the broad T-shaped head offers a firm grip. In dry conditions, the black-oxide finish resists corrosion.