These rods have nice deep, coarse threads which give a lot of surface area as well as something to bite into the cured resin to resist pull-out. Resins on the other hand are specifically designed to be used with high tensile coarse threaded steel rod (or better yet purpose-made high tensile studs which have guaranteed strengths which can be included in structural calculations - threaded rod doesn't have such data available and so shouldn't be used for structural works such as fixing load-bearing ledgers to walls). I also find that the younger they are, the more likely they are to try to sell you anything (on the other hand some of the older guys are actually ex-tradies and can be very knowledgeable)

When you think about it you are asking someone for advice who may never actually have used a lot of this stuff in anger and therefore their practical input as to what's best can be, to be charitable, zero. They don't require resin and probably wouldn't give a good fix with it as they need a tight hole (so you aren't going to get the bolt seated after you've put resin down the hole) and if you drill a bigger hole the Thunderbolts have insufficient thread to get the best pull-out resistance.Īs to Travis-Perkins (and for that matter builders merchants in general), I tend to find that caveat emptor is the order of the day. We often see them used to anchor scaffolding in place temporarily because they can be easily removed afterwards. They need an accurately drilled hole which needs to be blow out with a blower before they are inserted. stone massive, concrete, medium to hard brick and so forth. Thunderbolts are designed to anchor into good quality, hard masonry, e.g.

Best fixings for lath and plaster walls