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Black diamond cyborg crampon fastener sizes
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Hi, I occasionally volunteer with a local outdoors club. Later today I'll be heading over to restore their heavily abused ice climbing crampons, which they use to take folks out top roping on some roadside farmed ice. These things have been smacked into every stone in our local area and put away wet so they'll need some fastener replacements. Does anyone know the sizes of the nuts in this picture? I need the inner diameter and wrench size. https://www.needlesports.com/Catalogue/Climbing/Winter-Alpine-Expedition/Crampon-Accessories-Spares/Black-Diamond-Cyborg-Bolt-Kit-040500-BDI-CYBBKIT If anyone knows and can save me a trip I'd greatly appreciate it. |
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Shoot BD an email, they’re usually good about passing on that information. Another option is to take the crampons with you to Home Depot to see what fits. I think it might be an M6, but don’t quote me on that. |
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The size depends on whether it's metric or imperial. M5*0.8 or #10-32, they look identical but the imperial is ever so slightly smaller. Buy a high grade steel bolt, the stainless bolts are too weak for front points. |
rocknice2 wrote: I think they're M5, 8mm. Thanks for the help. |
J B wrote: M5 is the diameter ø5mm but the thread pitch is 0.8mm not 8mm |
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Following up for the sake of future googlers. The fasteners on the BD cyborg crampons are actually SAE. You need a 5/32" hex wrench and 3/8" spanner or socket to remove. I was dealing with severely seized fasteners so I bought a Tekton brand six point deep 3/8th impact socket (extra slim style). To remove the seized fasteners I first clamped the frontpiece to my workbench, with a piece of sacrificial scrap in between. Next I hammered a 4mm hex wrench into the 5/32" cap screw and braced the wrench against the table. I put a piece of rubber between the end of the hex wrench and the table to absorb shock and keep it from bouncing into the stratosphere. Next I applied light machine oil to the threads and loosened the nut with an impact wrench. Rinse and repeat ~50x. For replacement fasteners I used M5x0.8mm 55mm high tensile socket cap screws McMaster #91290A264 For replacement nuts I used Top-Lock Distorted-Thread Locknut, 18-8 McMaster #90045A112 I opted for distorted thread locknuts as opposed to the cheaper nylock nuts that come stock on the crampons because my colleagues report that these are a lot less prone to backing off under impact. Having a whole pile of these crampons in a loose and seized condition is what triggered this round of maintenance in the first place. The downside to these nuts is that they are "not reusable". I installed new front points and painted the bolts in Permatex aluminum anti-seize and torqued them to 6 Newton-meters with a tiny 1/4" torque adapter that I found in our mountain bike toolbox. Hopefully these frontpoints will stay rigidly attached until the next guy comes along to replace them all. |
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Well done! Good thing you didn’t have to sharpen all the front points. |
Bale wrote: Thank you. I do have a pile of dull front points that could be reused. If anyone has suggestions for the best to touch these up efficiently I'm all ears. I do have access to a hobby level machine shop complete with a belt sander and bench grinder. I did about 10 by hand before the wrist spasms set in and I tapped the spare parts pile. |
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bench/pedestal grinder, lots of water soluble oil in a squirt bottle, and take it slow to keep everything cool. Hold the points with vice grips close to the tip to eliminate any chance of oscillation causing work hardening (shouldn’t be an issue with forged points anyway). |
Eli W wrote: This worked thanks for the advice |
