Regular square nuts are four-sided threaded fasteners used where square geometry is required by design, application, or legacy specification. Square nuts remain in use across industrial, agricultural, maintenance, and restoration environments where dimensional compatibility or material seating characteristics call for a square profile rather than a hex pattern.
Selection is typically driven by application requirements, existing equipment configuration, or governing documentation.
Standard-height square nuts used in timber construction, carriage bolt assemblies, industrial machinery, and general-purpose fastening where square profile compatibility is required.
Reduced-height square nuts used in smaller assemblies and lighter-duty applications. These are commonly specified in equipment maintenance, electrical hardware, and legacy machinery where limited thread projection or space constraints exist.
Heavy square nuts provide increased thickness and bearing area for applications requiring additional thread engagement or greater clamping surface. These are used in structural timber systems, heavy equipment assemblies, and certain maintenance applications where square geometry is specified.
Square nuts are commonly used in timber and wood-frame assemblies, agricultural and outdoor equipment, carriage bolt systems, industrial machinery maintenance, restoration of vintage machinery and legacy equipment, and replacement parts programs requiring square-pattern hardware.
In many cases, square nuts are specified to maintain compatibility with original equipment or existing assemblies.
Many square nuts are supplied to established dimensional standards. Where drawings specify alternate materials, non-standard heights, special thread forms, or coatings, production may become print-specific.
When customer prints are provided, G-Fast reviews specifications for manufacturability, feasibility, and cost efficiency. Any recommended adjustments must be approved by the customer’s engineering team and reflected on an updated drawing prior to production. G-Fast does not provide design services.
G-Fast supplies regular, thin, and heavy square nuts for commercial, industrial, maintenance, and government-specified applications. We work strictly from approved customer documentation and support both domestic and specification-driven procurement requirements.
To evaluate availability or submit a specification, request a quote through the website.
The square shape provides flat bearing surfaces and 90-degree corners that may seat against mating materials or within prepared recesses.
In certain assemblies, square nuts are used with carriage bolts where the square neck of the bolt engages the base material while the square nut completes the clamping system. In other cases, square nuts are specified to maintain compatibility with existing hardware patterns in industrial or maintenance environments.
Square nuts are not selected as an upgrade over hex nuts; they are specified when geometry, legacy design, or application conditions require a square configuration.
Regular square nuts are available in a range of materials depending on environmental exposure and strength requirements, including carbon steel, stainless steel, bronze, and other specified alloys.
Thread configurations may include unified and metric series in accordance with applicable standards or approved customer drawings.
Dimensional standards may reference ASME, DIN, or ISO specifications where applicable.