Structural VS. Non-Structural

At Gmetalparts, we make super-strong structural and non-structural bolts and screws. Our wide range of screws is designed to meet NAS standards for top global OEMs.

Structural and Non-Structural Screws and Bolts

Structural screws and bolts are newer creations that provide top-notch strength and durability, especially in situations where shear-offs are a concern.

Even though structural screws and bolts are stronger than non-structural, or regular lag screws and bolts, they aren’t always used as replacements. This is due to the higher cost of materials and manufacturing for these superior bolts. Additionally, one major benefit of using structural bolts and screws is the ability to avoid drilling a pilot hole when working with non-metals.

In general, non-structural bolts and screws are preferred because they’re cheaper. But if extra strength is needed, structural bolts and screws can easily replace their non-structural counterparts. Generally, most O.E.Ms have fewer choices of structural screws and bolts compared to non-structural. However, at Gmetalparts, we offer a variety of products, with different drives, materials, and finishes. As stocked items, they have short lead times and, thanks to our superior manufacturing capacity, competitive prices.

We constantly strive to deliver excellence to our clients. If a product isn’t quite right, we will work to find a design that meets or exceeds their needs while complying with industry standards. All stock items in our portfolio can be customized to meet each client’s individual requirements while meeting or exceeding industry standards.

Standard vs. Non-Standard Structural Bolts

Sometimes, we call a structural bolt “standard” or “non-standard.” Standard structural bolts have a body and thread length based on ASME standards (Ref. ASME 18.2.6). Non-standard bolts aren’t on this chart but can be custom-made to fit customer needs. Non-standard structural bolts can have special features—like a hex configuration instead of a heavy hex head, fully threaded structural bolts, and other non-standard characteristics. You won’t find non-standard bolts easily available on the market. You will need a manufacturer, like Gmetalparts, to fulfill your needs.

Standard Structural Bolts

As we discussed in our blog post about the governing bodies of structural bolts, the American Society of Mechanical Engineers (ASME) sets codes and standards for many technical fields, including fasteners. For structural bolts, these standards cover everything from body diameter and head height to thread length and identification symbols.

Being the most commonly ordered, standard structural bolts are usually kept in stock by most manufacturers and distributors, resulting in faster turnaround times than non-standard structural bolts.

Non-Standard Structural Bolts

Non-standard bolts might not follow all ASME standards. You may need a fully threaded structural bolt for a special project. Since standard structural bolts have a shank, you will need a manufacturer to make these for you. According to ASTM F3125, a “T” or “S” is added to the bolt head markings to signify a non-standard configuration. The “T” is for fully threaded bolts, and the “S” signifies special head configurations, thread lengths, or other special features.

Ordering non-standard bolts takes longer, but you will get exactly what you need. It’s important to find a manufacturer experienced in custom work. Communication is key when ordering non-standard structural bolts, so choose a company you can trust.

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