These are special high-strength anchor bolts used in a coal-fired power plant to secure the water pumps’ foundation. They range from 1” to 3 1/2” in diameter and 137” in length. The actual bolts are made from ASTM low Alloy Steel F1554-04, grade 55. This steel has a tensile strength of 517-655 Mpa, (75-95 Ksi), and a yield strength of 380 Mpa, (55 Ksi). The nuts are made from ASTM A563, grade A, and the washers from ASTM F436, Type 1. The bolts are threaded per UNC threading, class 2A fit, and the finish is plain.
The photograph above shows anchor bolts, which are to be set in concrete with only a short portion above the surface. They are used to anchor equipment to a concrete slab by attaching to the bolts. Several of these at the top of the picture have polyethylene sleeves, which keep the wet concrete away from the bolt just below the surface. This makes it easier to make slight adjustments to the position of the bolt during attachment to the equipment which is to be anchored.