What does jh mean on a bolt

The lines on the head of a bolt indicate its grade. Three radial lines will indicate an SAE grade 5 fastener, while six radial lines will indicate an SAE grade 8 fastener. These are the most common grades, but there are others.

Our Fastener Identification Markings Chart has a complete list of bolt grades with accompanying head markings. Phone: I am not terribly familiar with any of these companies and so do not know if any are still in business. Eagan Machine in Connecticut. Ellis Precision in Texas. Engineering Materials Co in California. Erico Fastening in New Jersey. Erie Bolt in Pennsylvania. Erie Manufacturing in Texas. Euclid Industries in Ohio. Good luck. Leon- Apologies, I looked through all my information as was not able to find a registered marking of TNE.

I have a bolt taken from my triumph bonnivale it has nf stamped on it. I need a replacement but slightly longer. I have tried all suppliers christchurch Dorset area. Nobody can help me with this. Phil- Apologies, but we do not handle any automotive fasteners. Perhaps a local machine shop can help with this special. Check out the Brittish Standard specifications for National Fine threads.

Can you supply me with the manufacturer? I found a couple at work and thought it a little more than odd??? I have a bolt with a circle with a capital M or W marked in the circle do you no what brand that would be.

Is there a way to determine a bolts material from looking at it? For example, we generally need hardware that is both corrosion resistant and non-magnetic. Any series stainless would be sufficient. Dave- Many fastener grades require head markings that will also indicate the chemistry. In addition to these ASTM grades, bolts that are not made to a bolt specification are sometimes marked with the steel they are made from.

For example we have seen bolts marked or to indicate they they are made from or stainless steel. If the bolt is not marked with any of the above, then you would need to have a chemical analysis performed to see what steel was used.

Would you use grade 2. Karl Tashjian. You should be safe moving forward with grade 2. To Rebecca, who asked a question on August 10, at pm. You were looking for information about a bolt which has its head marked SB R. In other words, if your bolt was not a BSF fastener, then its head would be stamped in accordance with the grade F or grade 5 coding system — which would be three lines radiating from the centre of the bolt head at degree intervals.

Why did SAE make 3 lines mean grade 5 and 6 lines mean grade 8. Ken- We assume that it was done for simplicity, but those markings were decided upon decades ago and we are not sure why the members of the committee decided as they did. It has a bolt functioning as a shear bolt. I think I can discern a 2 offset form the diamond to the lower left. I am hoping for confirmation that this particular bolt is a grade 2 and appropriate to function as a shear bolt.

I am considering replacing it with a shear bolt bought at Tractor Supply to be safe. Charles- The marking requirement for SAE grade 2 bolts is nothing, no mark. Grade 2 is the lowest grade commonly available, so what you have is likely not weaker than grade 2. However, if you are unsure, replacing it with a known grade may be worth the peace of mind. Is this thread still open? I disassembling an old bench vise to restore it we came across a square head bolt marked with a swastika inside a triangle over the letters KI.

Privacy Policy. Whats the initials JH stand for on a bolt? User Name. Remember Me? Mark Forums Read. Jeep Friends Forum This is a forum for jeep friends to hang out.

For more formal atmosphere hop over to the Technical Forum. Thread Tools. LeadFoot Registered User. Find all posts by LeadFoot. Allen Moderator. Find all posts by Allen. It seems the most common marking we se these days is JH. Tractor Supply Co sells them by the pound. Are you surprised that the JH bolts are made in Taiwan? Here is the link to the. I guess they found an even cheaper source.

Lets be honest, they would not switch vendors to pay more, and if they wanted to ensure real quality, they would not be sourcing hardware in China and Taiwan in the first place, now would they? In their somewhat defense, it is very common today for manufacturers to find cheaper materials, rather than raise their prices.

Some do both, but cheaper materials is a "behind the scenes" endeavor. We have seen two new markings recently, and one has proven at least once to be a failure. The one looks like , but it is upside down. That is the one that failed during installation.

It never got tight, and then it snapped.