Kawasakifreak Posted October 19, 2011 Report Share Posted October 19, 2011 Stripped a thread on my Honda CX500B. The M10 bolt shank's diameter = 6mm so I've drilled out the old thread using an over-sized 6.3mm drill bit as recommended by Tracey Tools on the phone yesterday. I've tried an M6 x 1mm tap but it just slots in the hole without cutting any thread - pls advise which tap size I should use ? Cheers. Link to comment Share on other sites More sharing options...
Chrisball Posted October 19, 2011 Report Share Posted October 19, 2011 Dont quite understand what you are trying to do! You have snapped off a m10 bolt?? If you are attempting to helicoil you need a M10 helicoil kit which you should get a drill and specific tap. You should try and EZ out or drill out the old bolt. The drill for the helicoil is bigger than 10mm. Use this drill to open out the whole for the helicoil tap, tap out hole and insert helicoil! Or are you refering to a M6 bolt with a 10mm hex head?? Link to comment Share on other sites More sharing options...
chrisexup Posted October 19, 2011 Report Share Posted October 19, 2011 An M6 helicoil uses something like an M7 tap, they are supplied with the Helicoil thread repair kit. If you get stuck i have a kit you can use (i'm in South Cheshire) Link to comment Share on other sites More sharing options...
bezzer Posted October 19, 2011 Report Share Posted October 19, 2011 As said... an M10 bolt with a 6mm shank????? If it is an M6X1 you've gone too big with a 6.3 drill no wonder you can't cut a thread. 5mm is the tapping drill for an M6x1 thread. Whoever you spoke to at Tracy tools must have misheard what you were saying. 6.3 is a nothing size don't think I've ever seen an M7x.7 thread used which is what 6.3 would be used for or as a clearance hole for an M6 bolt. Link to comment Share on other sites More sharing options...
speedy sie Posted October 20, 2011 Report Share Posted October 20, 2011 helicoil is good but not that good in ali,go for a time sert,lot better. Link to comment Share on other sites More sharing options...
lorenzo Posted October 20, 2011 Report Share Posted October 20, 2011 I suspect the m10 reference is a red herring and at a guess it's an m6 bolt but with a 10mm head? Link to comment Share on other sites More sharing options...
bezzer Posted October 20, 2011 Report Share Posted October 20, 2011 This is the point > you're over here> The OP is helicoiling, not drilling and tapping the original material. Drill out the old damaged thread, whatever size it is, with a drill size larger than the original thread as supplied/recommended by the helicoil kit. Tap it out with the helicoil tap (not a normal tap). Wind helicoil in with helicoil tool. Snap Tang off. Job jobbed. I'm not over there the OP is, a helicoil kit comes with the correct tapping drill and tap, if it was one of the other make kits you can get now they'd at least say what the tapping drill and tap was. Drilling the hole way oversize and trying to retap with a standard M6 tap doesn't exactly show the OP has a grasp of what he's doing, Tracy tools were obviously giving him a tapping drill size for the insert he's supposed to be using. Link to comment Share on other sites More sharing options...
gixerboy1 Posted October 20, 2011 Report Share Posted October 20, 2011 The diameter of an M6 cap head is 10mm. The drilling size for M6 helicoil is 6.3/6.4mm depending on which kit you have. Link to comment Share on other sites More sharing options...
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