
Order by 24/7 by web, contact our sales reps or call by phone.

What you need, when you need it, all in one place.

Most orders ship same day.

Advice and support from knowledgeable professionals.
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.
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.
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.
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.
The Sugatsune JSA-120S is a Single Action Spring Hinge, so it swings in one direction and uses an internal spring to return the door to the closed position after opening.
The hinge is described as self closing with adjustable closing speed, meaning the spring tension can be set so the door closes at a controlled rate suited to the door weight.
The product description states that the hinge can be wall mounted, so one leaf is suited to fastening directly to a wall surface beside the opening.
The web description specifies eight #8 flathead countersunk screws at 3/4 inch or longer, so the leaves are drilled for flathead screws that sit flush in the countersinks.
The SAP description lists the product as a spring door hinge 3-1/8 W in stainless steel, giving a defined hinge body width for layout and edge clearances.
The description notes resistance to bending, which helps the hinge maintain its shape and alignment over repeated cycles, supporting consistent swinging and latching performance.
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.
Sold In: 1 Each
Quantity | Unit Price | Catalog | ||||
|---|---|---|---|---|---|---|
Sold in: 1000 Each | WW38330 Mfr# 3670000151961 1000 | Würth #8 x 3/4" Flat Head Assembly Screw Phillips Drive - Sharp Point Coarse Thread Black, 3670000151961 1000 - 1000/Box |