Rich Posted August 13, 2012 Report Share Posted August 13, 2012 Took my seats out last week to wet vac them and when refitting one of the bolts wouldn't go in. Pulled it out and the threads were getting chewed up. I got a free bolt from my local bolt place this morning after they measured the standard one. It started going in ok and then slowly got really tight so I took it out and that is getting chewed up. I think it must be the threads in the hole but how am I going to sort this out? I guess it's not safe letting anyone sit in the passenger seat for now? Quote Link to comment Share on other sites More sharing options...
Tony Posted August 13, 2012 Report Share Posted August 13, 2012 Put plenty of oil on it and go for it..... Quote Link to comment Share on other sites More sharing options...
Rich Posted August 13, 2012 Author Report Share Posted August 13, 2012 But the threads on both bolts are now buggeredand it must be the threads in the hole doing it. I guess once it's in it doesn't have to come out again. Quote Link to comment Share on other sites More sharing options...
scorps Posted August 13, 2012 Report Share Posted August 13, 2012 Re tap it. Quote Link to comment Share on other sites More sharing options...
SMARTLY Posted August 13, 2012 Report Share Posted August 13, 2012 You need to look what it's going into and if you can get to it to repair / replace. See if it goes right through the floor and out the other side. Quote Link to comment Share on other sites More sharing options...
Bazza Posted August 13, 2012 Report Share Posted August 13, 2012 how come the bottom threads haven't been chewed up ? it looks as if it tapers the threads on both bolts look different with the original looking a finer tread, counting the threads they are different but may be just the picture or size difference I would tap the hole out and get an original bolt Quote Link to comment Share on other sites More sharing options...
Rich Posted August 13, 2012 Author Report Share Posted August 13, 2012 The original bolt is thinner at the bottom, it goes straight into the hole and starts turning where it has chewed up. On the bolt they gave me it is slightly chewed from the bottom of the bolt as it's all the same width. Good point about the number of threads, the original is 18 and the other one is 20, is it this making it difficult to do up? The threads are also thinner on the original like you say. How much is a tap and die set and how do I know what size I will need? Didn't really want to go that route as it's money on a tool I will probably use the once. If I use these doesn't it make the hole bigger so I couldn't use an original bolt after? Here are photos of the hole. Quote Link to comment Share on other sites More sharing options...
Bazza Posted August 13, 2012 Report Share Posted August 13, 2012 looks like original bolt thread pitch is 1.25 and the other one is 1.5 standard British bolt would be 1.5 with fine thread being 1.25 JIS (Japanese standard) standard thread is 1.25 !! 1.25 is a thinner thread allowing for a tighter/secure fixing, would make sense on seat fixings you need a m? x 1.25 tap (probably M10) Quote Link to comment Share on other sites More sharing options...
Vipercar93 Posted August 13, 2012 Report Share Posted August 13, 2012 Your best bet is to get a thread gauge and measure the old bolt threads. That way it leaves no room for error. The gauge is worth having around if you come across anything else like this. Looking at it I would agree with Bazza =) Never dealt with Japanese standard bolts though. American/British is enough for me! Not sure why it tapers at the end. Looks like it could just be made that way so the person/robot fitting them can get the bolt in easier. Quote Link to comment Share on other sites More sharing options...
Rich Posted August 14, 2012 Author Report Share Posted August 14, 2012 I never thought about the thread pitch, bolts aren't something I've had to look into before. Would the bolt place I went to have only sold UK spec ones, so 1.5? Shows you not to trust these places then and check for yourself as well! The original bolt wouldn't screw into a couple of the holes, which is why I knew it was the bolt. I guess trying this bolt the shop gave me has now buggered the thread in the hole if it's the wrong type. I know they measured the original bolt and I think he said it was 8.9 or 80.9, I can't quite remember and I'm not sure what that is measured in? I don't have a gauge or tap and die set so will see if I can borrow them. Quote Link to comment Share on other sites More sharing options...
Vipercar93 Posted August 14, 2012 Report Share Posted August 14, 2012 Each bolt size(M6,M8,M10, ect) will have a different thread pitch. There are American Standards, European standards, and I guess Japanese standards for thread pitch. Each standard will have a coarse thread pitch and fine thread pitch. With your seats check the bolt strength, or grade. IIRC they use lower grade bolts on safety kit. Lower grade bolts will stretch instead of snap when overloaded, within reason. A higher grade bolt will hold more, but when taken over the yield strength it will snap. Not sure on Japanese standards but I guess they would fit in with the American/European standards. Quote Link to comment Share on other sites More sharing options...
Rich Posted August 14, 2012 Author Report Share Posted August 14, 2012 Cheers for the info I'm gonna try and get another original bolt, clean the hole out and try to apply some pressure when fitting it. If it doesn't go I will have to re-thread it. Quote Link to comment Share on other sites More sharing options...
Vipercar93 Posted August 14, 2012 Report Share Posted August 14, 2012 It's cross threaded pretty good, hope there is enough thread left to re-use the same size. You might end up having to use a larger bolt. If you take a pic of the top of the bolt we could probably let you know what grade it is. I don't know how expensive they are. Quote Link to comment Share on other sites More sharing options...
Rich Posted August 14, 2012 Author Report Share Posted August 14, 2012 I'll give it a try as I really don't want the hassle of sorting it out if I'm honest. Do you mean the head top? I'll get some better photos of them. Anyone know of a bolt place online that will do Jap spec ones as well? Quote Link to comment Share on other sites More sharing options...
Vipercar93 Posted August 14, 2012 Report Share Posted August 14, 2012 yep I do. Ebay =) Just have to find the right shop. I have used another not from ebay, but they are expensive. Let me have a look. More I think about it not sure what grade the bolt will be, the head of the bolt will say anyways. Quote Link to comment Share on other sites More sharing options...
Rich Posted August 15, 2012 Author Report Share Posted August 15, 2012 Are these ok below, I think the right size should be in the tap and die set? Tap and Die set - http://www.ebay.co.uk/itm/40-PCE-METRIC-TAP-WRENCH-AND-DIE-PRO-SET-CUTS-M3-M12-BOLTS-IN-HARD-MOULD-CASE-/160802183712?pt=UK_Hand_Tools_Equipment&hash=item25708e9a20#ht_3125wt_1095 Micrometer - http://www.amazon.co.uk/Digital-Caliper-Vernier-Gauge-Micrometer/dp/B0063571EY/ref=pd_cp_diy_0 Quote Link to comment Share on other sites More sharing options...
Rich Posted August 15, 2012 Author Report Share Posted August 15, 2012 Are the above ok then? Some on the Corolla forum is sending me a couple of original bolts so I'm going to tap the hole and hopefully it won't have to be made any larger. Quote Link to comment Share on other sites More sharing options...
Vipercar93 Posted August 15, 2012 Report Share Posted August 15, 2012 Sorry, didn't get back. The tap set is a cheapo, but should do for what you need. If you are getting some more OEM's don't worry about the micrometer. If you want to read threads though you would have needed a thread gauge. Quote Link to comment Share on other sites More sharing options...
Freaky Roadster Posted August 15, 2012 Report Share Posted August 15, 2012 I wouldn't trust that tap set incase the tap breaks in the hole. Might be better going for a single tap of better quality. These are okay http://www.tapdie.com/html/metric_taps_fine_or_taps_metri.html http://www.arceurotrade.co.uk/Catalogue/Cutting-Tools/Taps/Serial-Taps---Metric-BSW-BSF http://www.chronos.ltd.uk/acatalog/Engineering_Menu_Metric_Fine_HSS_Taps___Dies_185.html Quote Link to comment Share on other sites More sharing options...
Rich Posted August 16, 2012 Author Report Share Posted August 16, 2012 Sorry, didn't get back. The tap set is a cheapo, but should do for what you need. If you are getting some more OEM's don't worry about the micrometer. If you want to read threads though you would have needed a thread gauge. No worries I was thinking of using the micrometer to measure the hole or would I need something else for that? The only thing with getting the OEM bolt is I might have to make the hole bigger so it won't fit. Is this the right thread gauge? Seems cheap enough to get for the toolbox - http://www.amazon.co...45101556&sr=8-2 I wouldn't trust that tap set incase the tap breaks in the hole. Might be better going for a single tap of better quality. These are okay http://www.tapdie.co...taps_metri.html http://www.arceurotr...-Metric-BSW-BSF http://www.chronos.l...__Dies_185.html They're abit pricey though, I might as well go to a garage and see if they could tap the hole. This will probably be the only time I will have to use it so don't want to spend too much. Plus I would probably end up getting the wrong size or need to make the whole bigger meaning I'd have to buy 2 or 3 taps. Quote Link to comment Share on other sites More sharing options...
Vipercar93 Posted August 16, 2012 Report Share Posted August 16, 2012 You will want a metric thread gauge. http://www.amazon.co.uk/Silverline-282420-Screw-Pitch-Gauge/dp/B000LFTWSA/ref=sr_1_sc_3?s=diy&ie=UTF8&qid=1345102736&sr=1-3-spell Quote Link to comment Share on other sites More sharing options...
Rich Posted August 16, 2012 Author Report Share Posted August 16, 2012 You will want a metric thread gauge. http://www.amazon.co.uk/Silverline-282420-Screw-Pitch-Gauge/dp/B000LFTWSA/ref=sr_1_sc_3?s=diy&ie=UTF8&qid=1345102736&sr=1-3-spell I knew that! Cheers Quote Link to comment Share on other sites More sharing options...
Bazza Posted August 16, 2012 Report Share Posted August 16, 2012 Sorry, didn't get back. The tap set is a cheapo, but should do for what you need. If you are getting some more OEM's don't worry about the micrometer. If you want to read threads though you would have needed a thread gauge. No worries I was thinking of using the micrometer to measure the hole or would I need something else for that? The only thing with getting the OEM bolt is I might have to make the hole bigger so it won't fit. Is this the right thread gauge? Seems cheap enough to get for the toolbox - http://www.amazon.co...45101556&sr=8-2 I wouldn't trust that tap set incase the tap breaks in the hole. Might be better going for a single tap of better quality. These are okay http://www.tapdie.co...taps_metri.html http://www.arceurotr...-Metric-BSW-BSF http://www.chronos.l...__Dies_185.html They're abit pricey though, I might as well go to a garage and see if they could tap the hole. This will probably be the only time I will have to use it so don't want to spend too much. Plus I would probably end up getting the wrong size or need to make the whole bigger meaning I'd have to buy 2 or 3 taps. another route :(if m10 x 1.25) http://www.amazon.co.uk/Piece-Thread-Repair-1-25-13-5mm/dp/B007QWQVZS/ref=sr_1_3?ie=UTF8&qid=1345115882&sr=8-3 Quote Link to comment Share on other sites More sharing options...
Rich Posted August 16, 2012 Author Report Share Posted August 16, 2012 another route :(if m10 x 1.25) http://www.amazon.co...45115882&sr=8-3 That looks interesting. What are the thread inserts as other kits don't come with these? Do you use that kit the same as the other taps? How can I find out whether this hole is an M8 or M10? Quote Link to comment Share on other sites More sharing options...
Vipercar93 Posted August 16, 2012 Report Share Posted August 16, 2012 What size socket did you use on the bolt? That usually gives a rough indication. I like helicoils, always forget about them. Other kits just offer the tap. With a helicoil you tap a larger hole, insert the helicoil and you have the correct size hole with perfect threads. http://en.wikipedia.org/wiki/Threaded_insert Quote Link to comment Share on other sites More sharing options...
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