thread repair

try wti fasteners www.threadrepair.co.uk

www.threadrepair.co.uk

www.wireinserts.com www.wireinserts.com

Try www.wti-fasteners.co.uk for thread repair kits.

look at wti fasteners website.

The drilled hole needs to be 5.2mm for m5 (5.173-5.333 tolerance) if the hole is too big it wont work, you may need a keysert solid type insert. At wti fasteners they supply the kits with the correct size drill bit, tap, 10 inserts, tang break tool £22

The M4 stripped thread is drilled out to 4.2MM (tolerance 4.152-4.292mm) and then tapped with the correct wire insert tap, then the insert is wound in making sure it is installed with 1/2 a thread pitch either end if it is too long cut the oppersite end from the installation tang and make sure there are no burrs. When positioned correctly break the installation tang off either with tang break tool or long nose pliers. Do not use thread lock. The thread is ready to accept the m4 bolt etc. look at wti fasteners ltd website.

try wti fasteners, no minimum order charge. kits around £22

try wti fasteners for thread repair kit around £22 + post

The term Helicoil is a brand name only, the product is a wire thread insert, used to strenghten or repair threads that are damaged or weak. look at wti fasteners website.

the thread repair kit would cost more than £15

the tolerance is actually 5.173 to 5.333mm

wti fasteners, they will send in the post the sameday for next day delivery. Do not put thread lock on wire thread inserts as you will lose the mechanical advantage gained.

wti fasteners ltd, you get the drill bit included, tap, 10 inserts, tang break tool,

The 'wire thread insert' insert must be fitted at least 1/2 thread pitch below the surface of each end of the tapped hole, if fitted correctly it shouldn't come out. if you need to get them out, either use the correct extraction tool like an arrow head shape tool, or just grip with pliers and rotate backwards like undoing a bolt, dont be tempted to just pull it out as this will damage the tapped hole. A new one will just screw straight in, just position it right. WIRE THREAD INSERTS are always quoted as the finished length e.g. m5 x 1.5d = 7.5mm of thread when installed in the tapped hole. If the insert is too long, you could cut the oppersite end to the installation tang(back of the coil) make sure there are no burrs. Do not use 'thread lock' as you will lose the mechanical advantage gained by using wireinserts. Ask wti fasteners for help or advise.