We manufacture private label bolts with custom or no head markings. Hello, I have a hex bolt with the markings SB on one end of the bolt head and then R on the opposite end of the bolt head. Would you happen to know what those letters represent?
Thank you. You might look through the US Trademark and Patent office website — they have a list of registered head markings. I broke one of the bolts attaching my caliper bracket to the wheel assembly on my car.
Because brakes are perhaps the most critical application in the car, I am very eager to replace it with a bolt of the correct strength grade. I am very familiar with standards in the industrial setting, but this particular bolt is perplexing me. The head is slightly recessed in the center concave , featuring an almost centered 6 above a single dot, or perhaps a 9 beneath a single dot.
I would normally buy an OEM replacement, but unfortunately it seems they are not offered by the dealer even, and I have had no luck with auto parts shops.
Any insight you can provide is most welcome! Kevin- Our only guess is that it might be a grade 9, which is used in many OEM and automotive applications. We do not sell such items, but most auto parts stores would likely have them. A very heavy duty, large industrial bolt fell out of nowhere and landed on the roof of my car while driving down the interstate. It caused damage and pierced into the interior of my car so I had to get a whole new roof installed.
Do you know what this type of bolt is used for or where it came from? Thank you! Carol- We are sorry to hear about your accident. Chris — Apologies, but we looked through our list of head marks, but were unable to locate OF.
Does anyone know what manufacturer head marking is 3 dots in a triangle shape. I have an indented hex head flange screw with One at the top and two at the bottom. Any help would be appreciated. Ali- We looked through our list of manufacturing identifications and were unable to find the markings you describe. No radial lines. Is this a grade 2 bolt? Store employees do not seem to know. Stuart- Our guess is that your bolt is an SAE grade 2 bolt. If it is a bolt from tractor supply bulk bins they are a grade 2 if the bolt has a gold color that is the grade 8.
Chase- Yes, grade 8 bolts are usually yellow zinc plated, but that in itself is not an indicator of grade, since you could yellow zinc plate any grade.
The head markings will indicate the grade, the plating is purely aesthetic. I have a bolt, with 3 grade 5 hash marks around the outside, and a triangle that swirls into the center. What kind of bolt is this? They are a distributor that has private label bolts made with their head mark.
I have a bolt with HCZ and 3 hash marks with a line through them below that? John- Yes, the three radial lines indicate that the bolt is SAE grade 5. Dale- 8. I came across some square head lag bolts where the only marking is a U on the head. They are also a golden yellowish material..
Any ideas on what I have. Lag bolts are not typically graded, so since there are no grade marks non your bolt I would have to say it is just low carbon, mild steel.
Why do you add two to the radial lines on a bolt for the grade? The standard was written decades ago. Since no marks zero marks indicates a grade 2 fastener, just 2 to the number of marks on a bolt head to arrive at the grade of the bolt.
And yes, six radial dashes is SAE J grade 8. Trying to find out what the letters BT on the head of a coach bolt 6mm diameter and approx 70mm length might be. Any ideas? John- I am sorry, but that does not immediately ring a bell. Jason- FNL is likely the bolt manufacturer, Fastenal. Appearing on the head of a bolt, it would look something like Figure 1. Over the years, different organizations have come together and attempted to bring some order to the fastener industry by releasing standards that provide specifications for certain types of fasteners.
These specs can cover anything from material composition to dimensional tolerances to plating. There are all sorts of standards for all sorts of fasteners. How important is a particular standard? Others are more obscure or are intended to service a limited segment of the industry.
Sometimes standards create classes or grades of fasteners by laying out material and physical requirements that a fastener must meet. These classes or grades begin to work as a kind of shorthand for fasteners. When you know a fastener is a Grade 5, for example, you automatically know many details about it. In order to help with identification, most standards that introduce classes and grades have marking requirements.
In a nutshell, this standard lays out mechanical and material requirements for inch bolts, screws, studs, sems, and U-bolts. The main thing to focus on here is that the standard introduces a designation system based on numbers where increasing numbers indicate increasing tensile strength. So a Grade 5 has a higher tensile strength than a Grade 2. The standard designates more grades than the three that I have chosen to focus on, and there are some decimal grades, such as Grade 5.
Wait a minute! You just reused the image from before! You know that the bolt is an inch-series bolt. And you know what its minimum tensile strength is. You would be hard pressed to detect that by eye. I know this is an old question thread, but the letters and sometimes symbols on a bolt refer to its' manufacturer.
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