epsilonGreedy Posted February 15, 2021 Share Posted February 15, 2021 I am struggling to find Spax stock for 4x30 and 4x35 countersunk partial thread screws in stainless. Amazon can supply full thread equivalents which has got me thinking what type of fixing jobs require partial v. full thread wood screws? At the start of my build I purchased a full set of 2400 Spax screws supplied in a mini suitcase draw ranging in size from 3.5x16 to 6x120. The 16, 20 and 25mm long screws were full thread and the rest were partial thread. Link to comment Share on other sites More sharing options...
Onoff Posted February 15, 2021 Share Posted February 15, 2021 A mate bought Spax from here. Cheaper than he could in the UK even factoring in shipping: https://www.klokow-gmbh.de/ Link to comment Share on other sites More sharing options...
ToughButterCup Posted February 15, 2021 Share Posted February 15, 2021 (edited) I ordered 4000+ (A2 SS, 50mm deck screws) from Klokow ( as above) Article number SPAX-0537000500503 , postage 24 Euros. 2 or 3 days (then - might be longer now) Quote which has got me thinking what type of fixing jobs require partial v. full thread wood screws? Cladding (my hands won't take the recoil of a nail gun, and the sheepdog goes mental.) Edited February 15, 2021 by ToughButterCup Link to comment Share on other sites More sharing options...
epsilonGreedy Posted February 15, 2021 Author Share Posted February 15, 2021 14 minutes ago, Onoff said: A mate bought Spax from here. Cheaper than he could in the UK even factoring in shipping: https://www.klokow-gmbh.de/ Looks good and unlike the Amazon site the parts are sensibly described whereas on Amazon the Spax screw product database must have been setup by someone who has never picked up a screwdriver in their life. The German site also offers "Amazon Pay" which I hope will remove some of the financial risk of dealing with an overseas retailer. Link to comment Share on other sites More sharing options...
markc Posted February 15, 2021 Share Posted February 15, 2021 Full thread screws are convenient for general use but are significantly weaker in shear and bending due to the metal removed to form the helix. Also straight shank screws will pull pieces together (floor boards etc.) while full threads leave any gaps and simple pin the two parts where they are 1 Link to comment Share on other sites More sharing options...
SteamyTea Posted February 15, 2021 Share Posted February 15, 2021 Full thread is a screw, partial thread is a bolt. Link to comment Share on other sites More sharing options...
joe90 Posted February 15, 2021 Share Posted February 15, 2021 (edited) 11 minutes ago, SteamyTea said: partial thread is a bolt. Not in a “wood” screw it’s not ? to pull bits together with full thread requires a clearance hole in the top piece. Edited February 15, 2021 by joe90 1 Link to comment Share on other sites More sharing options...
SteamyTea Posted February 15, 2021 Share Posted February 15, 2021 4 minutes ago, joe90 said: to pull bits together with full thread requires a clearance hole in the top piece. They all do, that is how bolts work. This Screw or Bolt debate has been done before. It is material independent and is all to do with what is being joined together and why. Bolts need washers as well. Link to comment Share on other sites More sharing options...
joe90 Posted February 15, 2021 Share Posted February 15, 2021 (edited) 56 minutes ago, SteamyTea said: They all do, that is how bolts work. @epsilonGreedy is talking about wood screws! and so am I ! Edited February 15, 2021 by joe90 Link to comment Share on other sites More sharing options...
Gone West Posted February 15, 2021 Share Posted February 15, 2021 1 hour ago, SteamyTea said: Full thread is a screw, partial thread is a bolt. If it's threaded with a point on the end it's a screw, without a point it's a bolt. Link to comment Share on other sites More sharing options...
SteamyTea Posted February 15, 2021 Share Posted February 15, 2021 14 minutes ago, PeterStarck said: If it's threaded with a point on the end it's a screw, without a point it's a bolt. No, it is to do with the shank. Link to comment Share on other sites More sharing options...
joe90 Posted February 15, 2021 Share Posted February 15, 2021 1 hour ago, SteamyTea said: It is material independent and is all to do with what is being joined together and why. I disagree, it is material dependant. With metal or wood you have bolts and screws, screws have thread the whole length, bolts do not. Both require clearance holes in both pieces (and washers). With wood you can have full threaded screws or partial threaded screws , clearance hole in one or not. To clamp two pieces of wood tightly you need either partial threaded or a clearance hole in the top piece. There are special wood screws made with a different thread pitch near the head specifically for pulling pieces together. 1 Link to comment Share on other sites More sharing options...
Onoff Posted February 15, 2021 Share Posted February 15, 2021 Some threads see me wanting to make a bolt for the door... 1 1 Link to comment Share on other sites More sharing options...
SteamyTea Posted February 15, 2021 Share Posted February 15, 2021 2 minutes ago, joe90 said: screws have thread the whole length, bolts do not. Yes, isn't that what I said. 3 minutes ago, joe90 said: To clamp two pieces of wood tightly you need either partial threaded or a clearance hole in the top piece. Yes, that is what bolting is. 4 minutes ago, joe90 said: There are special wood screws made with a different thread pitch near the head specifically for pulling pieces together. Are they screws or bolts, or hybrids. Link to comment Share on other sites More sharing options...
SteamyTea Posted February 15, 2021 Share Posted February 15, 2021 3 minutes ago, Onoff said: Some threads see me wanting to make a bolt for the door... Nothing to do with Zoot's extension. Link to comment Share on other sites More sharing options...
joe90 Posted February 15, 2021 Share Posted February 15, 2021 Full thread v. partial thread wood screws. this is the original question, the clue is in the words “wood screws”, @epsilonGreedy is not talking about bolts or screws with nuts (and washers of course) ?♂️ Link to comment Share on other sites More sharing options...
Gone West Posted February 15, 2021 Share Posted February 15, 2021 There doesn't seem to be a consistent definition on the internet although the fact that a screw has a self tapping thread and a bolt has a machine thread is often mentioned. So the length of thread on the shank seems irrelevant. "Although coach bolts and coach screws are distinct components in their own right, the two do share a number of similarities. The most notable similarity is the head shape, which is domed, or mushroom-shaped, in both instances. Both coach screws and bolts are also best suited for use with wood." "However, a key difference is that coach screws feature a self-tapping thread. This means that these screws can create their own threads in timber, ensuring a more seamless installation. On the flip side, carriage bolts have a machine thread, meaning that they always need an adequately-sized pilot hole to be drilled into the material before installation." Link to comment Share on other sites More sharing options...
joe90 Posted February 15, 2021 Share Posted February 15, 2021 When I did engineering in college (back in the dark ages?) we were always taught bolts had a plain section which fitted the thickness of the materials held together and screws were threaded all the way. The difference is bolts had a bigger diameter plain section than the thread to be a snug fit in the material, wood screws with a plain section is a smaller diameter than the thread. Link to comment Share on other sites More sharing options...
Onoff Posted February 15, 2021 Share Posted February 15, 2021 3 hours ago, PeterStarck said: If it's threaded with a point on the end it's a screw, without a point it's a bolt. Machine screws! (Haven't got a point). Link to comment Share on other sites More sharing options...
SuperJohnG Posted February 15, 2021 Share Posted February 15, 2021 20 minutes ago, joe90 said: When I did engineering in college (back in the dark ages?) we were always taught bolts had a plain section which fitted the thickness of the materials held together and screws were threaded all the way. The difference is bolts had a bigger diameter plain section than the thread to be a snug fit in the material, wood screws with a plain section is a smaller diameter than the thread. Just to really liven this thread up.... Bolts that have the shank threaded are called set screws....??? 1 Link to comment Share on other sites More sharing options...
Onoff Posted February 15, 2021 Share Posted February 15, 2021 Link to comment Share on other sites More sharing options...
SteamyTea Posted February 15, 2021 Share Posted February 15, 2021 12 minutes ago, Onoff said: That looks like something @pocster uses at the Thursday threesomes. Link to comment Share on other sites More sharing options...
Pocster Posted February 15, 2021 Share Posted February 15, 2021 17 minutes ago, SteamyTea said: That looks like something @pocster uses at the Thursday threesomes. Changed to Wednesday now . Ticket entrance only 1 Link to comment Share on other sites More sharing options...
SteamyTea Posted February 15, 2021 Share Posted February 15, 2021 24 minutes ago, pocster said: Changed to Wednesday now . Ticket entrance only From my second favourite film. http://www.geocities.ws/sbmoviemp3/mp3/wank.mp3 Link to comment Share on other sites More sharing options...
SimonD Posted February 15, 2021 Share Posted February 15, 2021 This place have thought long and hard about this problem and just call them both: M12 Hexagon Head Set Screws Bolts, High Tensile Grade 8.8 Galvanised, DIN 933 https://boltworld.co.uk/collections/m6-bolts/products/m12-hexagon-head-set-screws-bolts-high-tensile-grade-8-8-galvanised-din-933?variant=32061282451549 At least nobody will be confused now ? 1 Link to comment Share on other sites More sharing options...
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