Torque spec for HOG/DiveRite 5th port?

[Zung]

Oh, I overlooked the fact that it's about the turret retainer.
Please disregard my post above, it's about the port plugs.

 

[gsk3]

Just wanted to close the loop here. The HOG 5th port adapter is, as predicted, an exact fit for the DiveRite reg. Frankenreg for the win.

 

[SDAnderson]

The 5th port turret retaining bolt used in the Hog D1 is, indeed, a turret retaining bolt. Consider: this bolt is the only thing that holds one end of the regulator together, is also the HP balance chamber, and that it is subject to reverse torque every time you unscrew the hose/plug from the 5th port. Ruh-roh. With out any regard for what anyone else says/recommends/does and with an eye towards the possibility of the bolt coming undone at inopportune moments (potentially instantaneously disassembling the regulator underwater and causing what is modestly referred to as a bad day), the answer from Edge/Hog is 175 inch pounds.

Maybe something was learned from other companies dealing with 5th port turret bolts, maybe they're pulling the number from their Foggy Bottom. Who knows? If you're going to follow the Edge/Hog specification, Edge/Hog recommends you measure the torque using inch pounds because this is a place where precision is important: much higher and the threads can strip, much lower and the bolt can come loose.

Just to be really irritating: if you are installing a turret bolt that doesn't have the 5th port in it, Edge/Hog has a different torque specification.

 

[gsk3]

Thanks reefraff

 

[Zung]

OTOH, Scubapro has a very low spec for this bolt: 70 in.-lbs for steel, and 35 in.-lbs for brass, and I've never heard of a single one that has become undone by itself, but there were catastrophic failure reports that could have been related to an overtorqued bolt that broke.

Go figure.

 

[SDAnderson]

OTOH, Scubapro has a very low spec for this bolt: 70 in.-lbs for steel, and 35 in.-lbs for brass, and I've never heard of a single one that has become undone by itself, but there were catastrophic failure reports that could have been related to an overtorqued bolt that broke.

Go figure.

Apples to oranges. ScubaPro makes a couple of diaphragm regulators, neither is available with a turret. They only offer turrets on their piston regulators. Drawing comparisons between the torque values of two radically different designs is a mistake.

There are important engineering design issues that differentiate piston turrets from diaphragm turrets; one important difference (and there are several more) is the completely internal configuration of the retainer in a piston design which protects it from, well, everything. This inverted position, relative to diaphragm designs, considerably changes the performance requirements for the retainer. The turrets in piston and diaphragm designs may be intended to serve much the same function but the retaining bolts have relatively little in common.

I'll use your SP bolt to further demonstrate the differences small changes can make in specifications: SP has two torque specs for what appear to be identical bolts, the only difference being the material used. If 35 inch pounds is enough to secure a brass bolt, why is the spec 70 for inox? The answer is that the materials perform differently and that imposes different requirements. If a simple change of material can require a doubling/halving of the torque to assure performance, it isn't hard to figure that the substantial differences between the piston and diaphragm turret retaining bolts, especially the the 5th port bolts, might also require different specifications.

Us geeks might have fun arguing the finer points and comparing one solution to another but gsk3 had a specific question for which there is a specific answer: 175 inch pounds. We should be a little careful not to let our obfuscations stir up the silt and obscure that.

 

[Aqua-Andy]

well we are at it does anyone have the torque spec for the DIN housing on a HOG D1?

 

[SDAnderson]

well we are at it does anyone have the torque spec for the DIN housing on a HOG D1?

Are you talking about the inlet fitting? If so, which connection: the filter retainer or the inlet tube? The answer is covered in the Hog repair class, hope to see everybody in one!