Glossary

A #1 elevator bolt, often referred to as a "#1 Norway elevator bolt." is a specific type of elevator bolt commonly used in the U.S. grain industry. 

A #3 head plow bolt is a type of countersunk bolt with a square neck, designed to fit flush in heavy equipment cutting edges or plows, and the "#3" refers to the specific head style/size as defined in industry standards. If you're sourcing these bolts, the material grade and length are also important to specify.

A #7 head plow bolt is a heavy-duty, countersunk-head bolt with a square neck designed for high-stress applications. The "#7" refers to the head size and shape, not the thread size. It's commonly used in grader blades, snow plows, and other earth-moving equipment.

An extra thick fender washer is a type of flat washer with a larger-than-standard outer diameter and increased thickness, providing additional strength and load distribution. Like standard fender washers, these are used to spread the load of a fastener (such as a bolt or screw) over a wider surface area, but the extra thickness makes them more suitable for heavy-duty applications where greater durability and support are required.

A 12-point flange screw is a premium fastener combining a high-torque 12-point head with an integrated flange for load distribution. It’s ideal for critical applications where strength, vibration resistance, and torque access are essential.

Side Lock Nuts, or Center Lock Nuts, are common all-metal Hex Lock Nuts with side crimps. These side crimps are engaged when the nut is applied to a male thread. The crimping creates metal-to-metal contact that prevents the nut from loosening in high-vibration applications. Earnest offers Top Lock Nuts in Grades A and 8 to ensure their strength and durability.