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The easiest way to look at it is to remember: the higher the type number the higher the corrosion resistance. Meaning, stainless steel is less corrosion resistant than and stainless steel offers more corrosion resistance than While boaters often focus on the corrosion resistance properties, there is a cost to this extra protection: strength.
Because of the alloy composition, there are differences in the tensile strengths of each type of stainless steel. To simplify it: the more corrosion resistant the fastener, the lower tensile strength.
In many cases this difference is minor and opting for the more corrosion resistant material will not affect the holding power. In other cases, the choice of a weaker material can make a difference. For highly loaded hardware that is under a load which is in-line with the fasteners a tensioned load or or stainless steel may be a better choice. As noted above, the lower tensile strength of stainless steel regardless of type would not be appropriate for shaft coupler bolts: grade 8 zinc coated bolts are the ideal choice.
This deck cleat calls for a strong through-bolted installation with good-sized backing plates under the bolts. This is a common question boaters ask when installing deck hardware.
Some applications are well suited to being secured by the aggressive threads of a self-tapping screw. These are usually non-critical items like Bimini and dodger frame brackets and snaps, halyard bags, cabinetry, interior hardware and decorations. Basically anything that carries a lighter load and is not something you plan to hang your life on. Through bolting is the best approach for hardware that experiences high loads such as cleats, windlasses, lifeline stanchions, pedestal guards, rope clutches, etc.
In these cases through bolting where possible and installing the largest and longest possible fastener in the rest may suffice. Do I have to pot the fastener in epoxy? Potting fasteners in epoxy means removing the deck or hull core often balsa, foam or plywood , and filling the cavity with thickened epoxy.
Once the epoxy is cured you then re-drill for the fastener and install the hardware with bedding compound. It sounds like a ton of work, but when approached methodically it goes much faster than expected�and it preserves the integrity and value of your boat. There are several pre-thickened epoxies on the market to make the process faster. When dissimilar metals make contact, damage due to galvanic corrosion can occur.
An example of this is where stainless steel screws and blind rivets are used to install hardware on to the aluminum spars of a sailboat. Using Tef-Gel and other preparations will not completely eliminate the problem.
For installations like these, one solution is to use aluminum blind rivets for non-critical installations where the superior strength of stainless steel is not required.
There is more than one bolt, screw or nut that will get the job done. Having read the above, the take-away is that you are now armed to make more informed decisions regarding which fastener to choose from several options. And that there is a time and place for graded steel vs. As noted the general rule say that for the money, stainless steel is the best choice for a majority of applications�until you begin working in the engine room�then zinc plated graded steel may be a better choice.
Hopefully some of the complexity of marine fasteners has been removed by the points addressed above and that your time spent in the fastener isle is reduced so that you can get back on the on the water faster and be able to contribute to that conversation around the dock carts. Wood Screws: Ideal for fastening two pieces of wood and drawing one piece toward the other.
Requires pre-drilling usually with tapered drill bits. Example: securing a table top to the base. Deck Screws or Self-Tapping Screws: These have a slightly smaller diameter shank to secure wood, fiberglass, soft plastics.
Pre-drilling recommended and can be accomplished with straight drill bits. Example: decking, cabinetry assembly. Pieces should be temporarily clamped for best fit. Often does not require pre-drilling in wood and some soft plastics. Example: attaching systems brackets to bulkheads, assembling cabinetry and interior frame work, installing non-critical hardware. Set Screws: Designed to work with female cut or rolled threads to capture a part.
Example: cutlass bearings in a strut, secure a door knob. Lag Screws: Often called Lag Bolts, larger screws with extra course threads and hex head. Ideal for anchoring heavy metal parts to wooden structural members. Example: motor mounts to engine stringers, brackets that support steering components.
Bugle Head Screws: Like self-tapping screws with a smaller, shallower counter-sink head. Can be installed with or without a pilot hole and will sink into soft wood for a flush finish. Often referred to as decking screws. Examples: used cabinetry case construction and cleating. Electrical conduit and the extruded aluminum angles Black Bass would purchase from a local lumber yard are light years apart in design and are no comparison.
I'm not saying you can not use stainless fasteners, what I am saying to be sure to us a protective coating between the two metals.
From Catt: I'm not saying you can not use stainless fasteners, what I am saying to be sure to us a protective coating between the two metals. In the Aerospace Industry it is known as installing fasteners wet with either a sealant or primer. As long as there is no metal-to-metal contact of dissimilar metals galvanic corrosion cannot occur. You can post now and register later. If you have an account, sign in now to post with your account. Paste as plain text instead.
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Instagram Youtube Facebook Twitter Pinterest. Reply to this topic Start new topic. Recommended Posts. Black Bass 0 Posted July 6, Posted July 6, Link to post Share on other sites. Catt 22, Posted July 6, Why would you not want to use stainless steel? CGH 0 Posted July 6, Aluminum Screws would be you best best or aluminum Pop ribbits. RobDar 0 Posted July 6, Long Mike 1, Posted July 7, Posted July 7, Catt 22, Posted July 7, Give open-ended standoffs a finished look and protect them from dirt and debris.
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13.05.2021 at 23:52:40 You might end up walking seats.