Fine-Thread screws are the preferred choice for hardwoods like cherry, maple, oak, etc. Composition: Zinc screws are recommended for a wide variety of indoor projects where moisture is not a concern. Stainless screws are designed for use in extreme environments that are exposed to moisture and corrosive elements.
While customer response to this product has been generally positive, several have noted that although there are indeed five different types of screws included, there are only three sizes, so the advertising is slightly misleading.
Otherwise, the screws work as advertised and achieve solid results. This kit features both pan-head and washer-head screws in both threads and a variety of sizes, all in a durable and easy-to-carry packing case. Most consumers report that the kit offers a great value for the price, and that the screws are high quality. There have been a few reports of heads being molded incorrectly, thereby resulting in stripping, but not enough to assume that this is a widespread issue.
Testers claim that the screws are strong, hold up well, and are resistant to rust, which is essential if the finished product is meant to be used outdoors. Reviews of the Kreg 8 have been mainly positive, with testers praising the strength and durability of the screws. Note that these screws are also available in larger quantities.
The Blue-Kote holds up well in field tests, with hobbyists using the product in numerous outdoor applications, including raised garden beds. If you intend to use any of the various Kreg Jigs to drill your pocket holes, it may help you to know they come with instructions and guidelines about screw sizes generally the same as what is in Robert Nubel's answer below.
But it is also possible to make your own pocket hole jig. Add a comment. Active Oldest Votes. There's no single answer to give, but here's a big chart from Kreg that breaks down different common scenarios and the suggested screw length: Image credit: Kreg Tool Company.
Improve this answer. Katie Kilian 2, 2 2 gold badges 15 15 silver badges 30 30 bronze badges. Robert Nubel Robert Nubel 1 1 silver badge 5 5 bronze badges.
To add to Robert's answer, note that wood screws have a top part of their shaft that don't have threads on them. In these pictures, that part of the screw ends at the piece being fastened, and the threads begin at the piece below it. Like all joinery with wood screws, the goal is to have the threads engage only in the receiving piece.
The piece being drilled through should use a clearance hole. If you use coarse thread screws for these surfaces, their aggressive threading may result in tearing and splitting of the wood surface that you are using in your project.
As such you need less aggressive threading and as such fine thread screws ensure that you get the desired holding and clamping power without the splitting apart of the wood. As such, choose Kreg screws with fine threads for use on hardwood surfaces such as Oak, Cherry, Maplewood, Walnut, Hickory, Mahogany, etc.
With all that we have seen in defining and describing the fine threaded screws, these fine threaded screws are stronger in terms of their tensile strength and their claiming capability as they are harder to shake and vibrate.
However, these screws are not so popular in their usage or are less commonly used as they are pretty delicate to handle and work with. There are more chances of damage to the threads and cross-threading with fine thread screws. Also, with fine thread screws, there are more chances of galling since there are more rotations and they may just slide against the friction.
So, to answer this question — these fine threaded screws can still be used almost anywhere you want but for best results, as we saw earlier, they should be used with harder and more dense wood surfaces. So, harder and denser the material finer shall be the threading of the screw for best fastening and clamping results. Having said that, is fine thread screw better in terms of holding capacity than the coarse thread screw? Let us find out. This is one of the most asked questions and is a legitimate one.
Though fine thread screws have a larger tensile strength and higher stress area that makes them good with hardwood surfaces, the coarse thread screws are more preferred due to their greater overall resistance to stripping and cross-threading. So for all major applications, the coarse thread screws have certain advantages to fine thread screws due to the following characteristics:. So to answer the question — Yes Coarse thread screws hold better due to all the characteristics that we discussed and provided that the wood type that is used is softwood and not the harder wood types.
But does that make the fine thread screws any less — No, the fine thread screws too find their appropriate usage and applications in wood types they are suitable for. Use this piece to find out which screw type to use and when. Keep it as a ready reference for all the questions that you may have in your mind and more. Hi Russ, that was a mistake, I fixed it. Coarse thread screws work best in softwood.
I always try to drill a pilot hole especially on the hardwood before driving in the screws. This will prevent the wood from cracking and the screw from breaking off.
The material is radiata pine, 18mm thick.
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