Blackwell Research stem (4 bolt - 26mm) - torque values?

Hermes3000
Hermes3000 Posts: 23
edited August 2011 in Workshop
Does anyone know the torque limits for a blackwell research stem - 4 x M4 bar clamp bolts, (26 mm clamp).

I bought it new on ebay, in an effort to make my second hand TT bike fit right, only to find that there is absolutely no torque information printed on it, or in the box. The seller had no information, and the manufacturer is long gone.

Here it is: http://cgi.ebay.com.au/ws/eBayISAPI.dll ... 0532051964

It took 5Nm to stop the bars from slipping. Given that I have a similar stem, with the same length M4 bolts, with the torque limited to 4Nm, I got a bit concerned.

Thanks!!
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Comments

  • rothers_bikeo
    rothers_bikeo Posts: 225
    The clamp bolts will be M5, a M5 skt hd cap screw takes a 4 mm Allen key.

    The usual tightening torque for M5 bar clamp screws is 5 N.m but that assumes sufficient thread engagement in the aluminium stem.

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