GOT a Question not here, Send me an E-mail and I will answer it. (john@linghunt.com)

 

Q7: Do you have any information on reel lines and hazards associated with it besides the typical tangles?

Tangles and drowning is probably the BIGGEST risk.

Another one is not managing the line and the error of holding on the line to brake the fish running.

This diver illustrated this in this video and he also showed the damage to his hand.

The YouTube Video is "age-restricted" and is only available once you log in to youtube.

Title: TUNA 65KG SPEARFISHING 

Author: SOTOSBAD

Date: April 26, 2016

Q6: I lost a spear tip the other day. I recall spraying some type of teflon spray on the thread and tightened it up. After shooting the FISH the tip spun off and I lost the tip and the fish. What should I apply to a thread?

There are so many different types of sprays and chemical options it can be confusing. The Spearfishing101 section contains a broader view of lubricants, sealers, cleaners, glues, etc. Thread gauling, rust and corrosion add to the confusion.

DO NOT USE THESE

The teflon callout doesn't mean it replaces teflon tape used as a joint sealer.

 

USE THESE on your spear threads

The goal is to add friction between the male and female threads and also reduce gauling effects.

LOCTITE 248 BLUE is a good choice or the teflon tape used for thread sealing are two choices.

this 248 loctite comes in a chapstick package, Perfect for your Dive Goodie spare parts bag.

Q5: I have a different polespear, and have water leaking into my pole at times which is frustrating. I seal the threads with teflon tape, but it's doesn't always seal. Is there something else I can do?

This is a common problem many spear-o's have. This is one of the reasons why the LINGHUNT POLE has a more complicated connector design than others on the market.

Watch this video and notice the tapered threads are used for sealing the joint. Straight threads require a different methods for a proper seal. The 40 second mark talks about thread sealing design.

Swagelok is a company I have used for many years in the Vacuum Industry,

Your best option is to use teflon tape or a sealant. Having a wire brush and a wire pick to clean up the threads before adding tape or sealant can help with results.

DON'T use telfon tape or thread sealants on the Linghunt Polespear Joints. It was designed to not use them.

Q4: Float lines are there any dangers I should consider as a rookie?

A: Drowning at depth is one thought. Float Line entanglements can be very dangerous. Consider shooting a huge fish and going to the bottom of the ocean while your hand or leg is caught in the line.

- - - Watch this Video - - -

Rider not in a good position, but at least he can breath vs a ride to the bottom of the ocean.

Q3: Stainless steels; I see a browish metal called 17-4 and also see 17-4 looking shiney. Why is there a difference in color from different web sites for spearo parts using 17-4?

A: 17-4 PH is a great material, that is why most manufacturers use it. Typically 17-4 is purchased in an annealed state and looks like typical stainless. After the machining is done the product is place in a heat treating furnace for a hardening process. During this step the 17-4 will turn a brownish to a purpleish color. This is just a thin oxide film formed during the heating and cooling cycle.

If a part is called out as 17-4 and it doesn't have this colored oxide film, then it might not be 17-4 or it might not have gone through the heat treating process. Check the stainless for magnetic properties. If it is magnetic then it's probably 17-4. Other types of Stainless are not magnetic as a rule of thumb.

Material in the annealed condition should NOT generally be put into service. In this condition, the material has an untempered martensite structure and is less ductile than heat treated material.

The untempered martensite may be subject to unpredictable brittle fractures. Basicly a sheared off thread....

Q2: I’ve read the common 6mm-1 thread is weak, why do you use this thread on your poles vs other sizes?

A: Not all Linghunt polespears have 6mm-1 threads, I'm happy to change the thread per request to mate up to your existing stack of spear tips. Most divers do want 6mm-1 for it's common and easiest to find tips for on the market.

The strength of this 6mm thread is a valid concern. My solution is to provide this thread with more strength. I use a male thread that was cold formed, not cut. In the process of forming a thread, the grain structure has more stress, ~30% more strength.

The left image shows how cold forming compresses and redirects material grain, increasing thread strength. A cut thread, shown at the right, interrupts the grain.

Remember: Tighter joints are always stronger.

Q1: I've read your comments / statements about vendors calling 8mm threads the same as 5/16" threads, but I find this hard to believe.

A: I found it hard to believe as well, but there are so many vendor listing with poor to terrible details as to product specifications. I have received email correspondence and phone calls from divers struggling with "why" does my stuff not fit together. Part of their problems is mis-information presented to them. Part of this is just "spin-out" for they don't want to deal with the issues the customer has. I'm not going to name manufacturer and sellers, but my goal is to educate the buyer so they can get the correct parts they need. Thread callouts and Size do matter.

Did you know that there are 5 different 8mm threads with different pitchs?