Mostly astm a193 grade b7 bolts are selected along with astm a194 grade 2h nuts. however there is no astm or other standard where it recommends using a194 gr. 2h nuts with this bolt. the reason that a194 grade 2h nuts are used more often with a193 grade b7 bolts is simply cost.

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A lag screw is a large, heavy-duty wood screw with a square or six-sided (hexagonal) head. it is used because of its strength. in practice, a lag screw's ability to resist "pull out" or withdrawal far exceeds that of a common screw or nail.

Step bolts. step bolts are similar to carriage bolts in that they both have a square shoulder and a larger bearing surface. step bolts, however, have a larger and lower-profile with a round head, creating a smooth surface. the larger heads also make it more difficult pull …

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