Fasteners for Battery Hold Down, Battery Switch

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Author Topic:   Fasteners for Battery Hold Down, Battery Switch

gorji posted 06-24-2006 10:16 PM ET (US)
What size and type of screw fasteners would one use for the battery box tie down and for mounting a battery switch? Should the holes and fasteners be sealed with 3M 5200? Is one drilling into the Whaler foam underneath?
I am thinking of installing a second battery and switch the console of my Montauk 170.
Thanks
jimh posted 06-25-2006 09:27 AM ET (US)
The usual fasteners employed in this application are stainless steel self-tapping or sheet-metal screws. The size is chosen to be appropriate for the equipment to be mounted. A battery switch would probably be fastened with a #8 screw. A battery hold down with a larger screw, perhaps a #12.
The console is constructed of a fiberglass laminate and does not have a a foam interior.
The battery should only be located in an area which as been reinforced to bear the weight of the battery. The area will also have imbedded material which will be capable of holding a screw. You can locate a diagram that shows the details of the 170 Montauk hull and where reinforced areas are located from
http://www.whalerparts.com/
It is a good idea to use a bedding compound or sealant or caulk on any fastener which penetrates the laminate structure of your boat and will be exposed to water, although Boston Whaler themselves does not follow that rule in all cases. Using 3M/5200 is probably not necessary. 3M/5200 is a very strong adhesive and takes about a week to cure. I generally use a generic brand of "boat caulk".

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Author	Topic: Fasteners for Battery Hold Down, Battery Switch
gorji	posted 06-24-2006 10:16 PM ET (US) What size and type of screw fasteners would one use for the battery box tie down and for mounting a battery switch? Should the holes and fasteners be sealed with 3M 5200? Is one drilling into the Whaler foam underneath? I am thinking of installing a second battery and switch the console of my Montauk 170. Thanks
jimh	posted 06-25-2006 09:27 AM ET (US) The usual fasteners employed in this application are stainless steel self-tapping or sheet-metal screws. The size is chosen to be appropriate for the equipment to be mounted. A battery switch would probably be fastened with a #8 screw. A battery hold down with a larger screw, perhaps a #12. The console is constructed of a fiberglass laminate and does not have a a foam interior. The battery should only be located in an area which as been reinforced to bear the weight of the battery. The area will also have imbedded material which will be capable of holding a screw. You can locate a diagram that shows the details of the 170 Montauk hull and where reinforced areas are located from http://www.whalerparts.com/ It is a good idea to use a bedding compound or sealant or caulk on any fastener which penetrates the laminate structure of your boat and will be exposed to water, although Boston Whaler themselves does not follow that rule in all cases. Using 3M/5200 is probably not necessary. 3M/5200 is a very strong adhesive and takes about a week to cure. I generally use a generic brand of "boat caulk".