Product specifications
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Our charts below gives useful product specifications for Gemini Marine Products.
All cast metal products are made with 316 stainless steel.
Plastic hinges are made with acrylonitrile butadiene styrene (ABS) plastic, fiberglass reinforced, with a 316 stainless steel link.
Whatever question you have, if the answer isn’t here, please call us and we’ll do out best to help. Then you’ll be ready to shop here on this site or via our distributors.
Split and sliding side mounts*
| Product | Item # | Tubing size US | Tubing size metric | Component | Component size |
| Sliding side mount | GEMSL-78 | 7/8″ | 22mm | Post screw (incl 2 x nylon washers) | M6 x 1.0 thread 20mm length |
| Post height | 1¼” (32mm) off tubing | ||||
| GEMSL-1 | 1″ | 25mm | Post screw (incl 2 x nylon washers) | M6 x 1.0 thread 20mm length | |
| Post height | 1¼” (32mm) off tubing | ||||
| GEMSL-125 | 1¼” | 32mm | Post screw (incl 2 x nylon washers) | M8 x 1.25 thread 20mm length | |
| Post height | 1” (25mm) off tubing | ||||
| Split side mount | GEMSJ-78 | 7/8″ | 22mm | Post screw (incl 2 x nylon washers) | M6 x 1.0 thread 20mm length |
| Post height | 1¼” (32mm) off tubing | ||||
| Clamp screw w/nut | M6x1.0 thread 20mm hex head cap screw | ||||
| GEMSJ-1 | 1″ | 25mm | Post screw (incl 2 x nylon washers) | M6 x 1.0 thread 20mm length | |
| Post height | 1¼” (32mm) off tubing | ||||
| Clamp screw w/nut | M6x1.0 thread 20mm hex head cap screw | ||||
| GEMSJ-125 | 1¼” | 32mm | Post screw (incl 2 x nylon washers) | M8 x 1.25 thread 20mm length | |
| Post height | 1” (25mm) off tubing | ||||
| Clamp screw w/nut | M6x1.0 thread 22mm hex head cap screw |
*Screws manufactured in metric
Other useful information
Concave post mounts, Sliding side mounts and Split side mounts – all sizes: Posts lift attachments 1¼” (32mm) off tubing.
Concave fork and post mounts – installing: We use a #10 tap then 10×24 (up to 1/4″ long) screws to attach to tubing. There is no need to throughbolt, but there is no harm in doing so if you wish. You can also add a small patch of either leather or rubber under the concave saddle if you feel you want more grip, but we do not do this as a rule as we have not found it to be necessary. If installed correctly, you will not get water leakage, even if you screw right through your canvas.
Sliding side mounts WILL NOT go around bends in tubing. If you need to access tubing inside a bend, use a split side mount (which you can attach right ON a bend if you like).
Hinge specifications
| Item # | OD standard | OD metric* | Insert diameter standard wall thickness | Insert diameter metric equivalent |
| GEMSSH-78-065SS | 7/8″ | 22mm | .065″ stainless steel | 18.75mm |
| GEMSSH-1-065SS | 1″ | 25mm | .065″ stainless steel | 21.75mm |
| GEMABSH-78049SS | 7/8″ | 22mm | .049″ stainless steel | 18.6mm |
| GEMABSH-78058AL | 7/8″ | 22mm | .058″ aluminum | 19mm |
| GEMABSH-78065SS | 7/8″ | 22mm | .065″ stainless steel | 19.3mm |
| GEMABSH-01065SS | 1″ | 25mm | .065″ stainless steel | 21.8mm |
*Hinge outside diameter manufactured in metric
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