Internal sizing was based off 2sn crimp shells
The lateral rib allows the clamp to be used as a patch on certain hoses
The internal ribs are wider and rounded so they aren’t sharp like a crimp fitting. This allows the clamp to seal on the outside rubber of the hose without cutting when used as a patch, however it will penetrate into the wire braid (spiral) when it is used as a joiner and has the internal support of the barb. Other benefits is that it allows for use on hoses such as R7 Thermoplastic because of the thinner wall, as it clamps well without cutting the hose.
The holes on the bottom clamp are threaded for ease of installation. Because it is a clamp and not a fixed fitting it can be used on a variety of hose types with different wall thicknesses. This offers a significant advantage over in field (reusable) fittings that are hose specific.
The clamps are made from 316 stainless steel. 316 was selected for its hardness to prevent bending when the clamp is tightened and was more cost effective than other options. Its anti-corrosion properties also make it suitable to be used in the marine industry.
The clamps are investment casted, although it’s a much more expensive than other options, such as sand casting, it is much more accurate and gives a much better finish.
An anodized grade 8.8 M8 bolt with a flat base was selected in order to avoid using a washer (for easier install). The use of grade 8.8 with the 316 stainless steel is intended to:
* Eliminate thread binding
* Make it easier to remove a broken bolt, and any thread striping should be restricted to the bolt and not the clamp.
The bolts were designed to be the first point of failure if overtightened, as it is cheaper and easier to replace the bolts than the clamp.