Single Action Spring Hinge Self-Closing 8 Holes, 4 Knuckles 3-1/8"W Stainless Steel

Single Action Spring Hinge Self-Closing For Doors

Single Action Spring Hinge Self-Closing describes a hinge designed to close the door by itself using a spring-loaded mechanism, which reduces the chance of doors being left open in regular traffic areas. The hinge is classified as a Single Action Spring Hinge, so it operates in one direction, which suits standard swinging doors where you want a consistent closing motion. The web description states that it is spring loaded for self-closing, which means the internal spring provides the force to pull the door shut without additional closers on the frame. The product is manufactured by Sugatsune America under part number JSA-120S, giving it a clear reference for matching to shop drawings or repeat orders. The SAP description notes a width of 3-1/8 W in stainless steel, so the size and material line up with applications needing a compact hinge footprint in a stainless construction.

Key Spring Hinge Details That Aid Door Work

• The web description notes that the hinge is spring loaded for self-closing, which means every open cycle is followed by an automatic close, useful where controlled door return is expected without separate door closers.
• The same description specifies self closing with adjustable closing speed, so the spring tension can be set to achieve a closing rate that matches the weight and swing of the door for smoother operation.
• The finish is stated as Alumite, providing a defined surface treatment that helps the hinge present a consistent appearance wherever an Alumite finished hinge is preferred on a project.
• The product description highlights resistance to bending, which supports applications where the hinge will see frequent use and needs to maintain alignment under repeated loading.
• The hinge is categorized under Hinges and Specialty Hinges, signaling that it addresses specialized self-closing needs beyond a standard butt hinge in cabinetry or light door projects.

Installation Details For The Spring Door Hinge

The product description specifies that the hinge can be wall mounted, which allows it to be fixed directly to a wall surface in situations where a conventional jamb is not present or where a surface-mount layout is preferred. The web description also states that the hinge requires eight #8 flathead countersunk screws at 3/4 inch or longer, so the installer can plan for that screw size and length when fastening through the countersunk holes in the hinge leaves. The presence of eight mounting holes distributes load across multiple fasteners, which helps the hinge support repeated opening cycles. The SAP description identifies the hinge as a spring door hinge at 3-1/8 W in stainless steel, which helps match the hinge body width to the available mounting surface during layout. The mention of self-closing with adjustable closing speed indicates that tension adjustments are made during installation and fine-tuning for proper return.

Using This Sugatsune JSA-120S Hinge In Projects

Where This Single Action Spring Hinge Fits Best

The brand listing identifies Sugatsune America as the manufacturer, placing this hinge within a recognized hardware line for woodworking and related trades that rely on consistent component identification. The product class is given as Single Action Spring Hinge, so it suits installations where the door needs to swing in a single direction and then return to the closed position under spring force. The category shows Hinges and Specialty Hinges, which frames this hinge as a solution for applications needing a dedicated self-closing action instead of a plain pivot. The SAP description calls it a spring door hinge at 3-1/8 W in stainless steel, aligning the hinge with doors sized for that hinge width and situations where stainless steel construction is desirable along the edge. The note that the hinge can be wall mounted extends its use to openings formed at a wall edge or partition where the hinge leaf attaches directly to the wall.

Why The Adjustable Self Closing Design Matters

The web description states self closing with adjustable closing speed, so the spring force can be tuned to the door weight and swing, which helps reduce slamming and improves the feel of the closing motion over time. The same description specifies that the hinge is spring loaded for self-closing, meaning the spring mechanism handles returning the door to the shut position without the installer needing a separate closer device for that function. The description notes resistance to bending, so the hinge is constructed to resist deformation in use, which helps maintain door alignment and consistent latch engagement through repeated openings. The hinge width of 3-1/8 W and its stainless steel specification in the SAP description give a fixed body size and material, which simplifies choosing this hinge where stainless hardware and that footprint are planned on drawings. The requirement for eight #8 flathead countersunk screws at 3/4 inch or longer indicates that the screw heads sit flush in countersunk holes, which helps the hinge leaves seat tightly against the mounting surfaces for more predictable swing.

Common Questions About This Spring Door Hinge

Choose This Hinge For Self-Closing Door Control

The SAP description identifies this product as a spring door hinge 3-1/8 W in stainless steel, which provides a defined size and material for projects calling for stainless spring hinges on compact doors. The product class of Single Action Spring Hinge and the note that it is spring loaded for self-closing align this hinge with openings that need an automatic return without adding separate closers. The adjustable closing speed noted in the web description allows tuning the swing to suit door weight and site conditions, supporting smoother operation after installation. For projects using Sugatsune America hardware, the JSA-120S part number provides a clear reference when selecting matching hinges across multiple openings.