SOSS 212 Series Invisible Hing...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$210.00
$208.19
SOSS 212 Series Invisible Hinge 3-3/4" Stainless Steel with 180° Swing

SOSS 212 Series Invisible Hinge 3-3/4" Stainless Steel with 180° Swing

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Model: 212SSUS32D

In Stock (leaves warehouse same day if ordered before 3pm ET)

$210.00
$208.19
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SOSS 212 Series Invisible Hinge 3-3/4" Stainless Steel with 180° Swing

The SOSS 212 Series Invisible Hinge is a 3-3/4" concealed hinge engineered for wood or metal doors with a minimum material thickness of 1-1/8" up to 1-3/8". Constructed of complete 316 stainless steel, this closet-style hinge delivers a flush fit, compact profile, and smooth single-action operation with a full 180° swing. Built for exterior, metal, and wood applications, it's designed to hold up in demanding commercial environments where corrosion resistance and appearance both matter.

Key Features

  • Door Thickness Compatibility: Designed for wood or metal doors ranging from 1-1/8" to 1-3/8" thick.
  • Compact Concealed Size: 3-3/4" overall hinge size provides a completely invisible, flush-fit appearance when the door is closed.
  • 316 Stainless Steel Construction: Complete stainless steel build offers superior corrosion resistance for exterior, metal, and wood applications.
  • Full 180° Swing: Single-action operation allows the door to open completely flat against adjoining surfaces.
  • Smooth, Durable Operation: Heavy-duty design supports reliable performance in commercial settings.
  • Wood Screws Included: Ships with wood screws; machine screws are available for an additional charge.
  • Radius Corner Design: Radius corner type for clean, precise mortise preparation.

Technical Specifications

  • Subcategory: Hinges and Pivots
  • Product Group: Door Hinges and Pivots
  • Product Subgroup: Concealed Hinges
  • Commercial/Residential: Commercial
  • Duty Level: Heavy Duty
  • Electronic: No
  • Corner Type: Radius
  • Series: 212 Series
  • Product Size: 3-3/4"
  • Product Category: Door Hinges and Pivots
  • Product Substrate: Zinc and Steel
  • Department: Door Hardware
  • Application: Exterior, Metal, Wood
  • Min. Material Thickness: 1-1/8″
  • Fire Rating: No
  • Power Transfer: No
  • Closer: No
  • Counter Bored Screw Holes: No
  • Screws Included: Wood
  • Packaging: 1 / Box = 1 Each
  • Packages Per Container: 1 Each
  • Price Per: Each

Typical Applications

  • Commercial Office Buildings
  • Educational Facilities
  • Healthcare Institutions
  • Retail Establishments
  • Industrial and Warehouse Facilities
  • Multi-Tenant Residential Properties
  • Government and Municipal Buildings

Why SOSS 212?

SOSS 212 Series hinges are built from complete 316 stainless steel for exceptional corrosion resistance in exterior, metal, and wood installations. The heavy-duty, single-action design provides a full 180° swing with a flush, invisible profile that combines superior appearance with dependable durability. Engineered for commercial applications where smooth operation and long-term reliability are essential.

SOSS 212 Series 3-3/4" Invisible Hinge in 316 stainless steel for 1-1/8" to 1-3/8" doors. Full 180° swing, flush fit, corrosion resistant. Shop now.

Product Specs

Subcategory:
Hinges and Pivots
Product Group:
Door Hinges and Pivots
Product Type:
Invisible Hinges
Product Subgroup:
Concealed Hinges
Commercial/Residential:
Commercial
Duty Level:
Heavy Duty
Electronic:
No
Corner Type:
Radius
Series:
212 Series
Product Function:
Invisible Hinges
Product Size:
3-3/4"
Product Category:
Door Hinges and Pivots
Product Substrate:
Zinc and Steel
Department:
Door Hardware

SOSS 212SSUS32D – Frequently Asked Questions

1) Will a SOSS 212 invisible hinge work on a 1-3/4 inch commercial door?
No. The 212 Series 3-3/4 inch invisible hinge is cut for doors 1-1/8 to 1-3/8 inches thick, so a standard 1-3/4 inch commercial door is outside its range. SOSS sizes its invisible hinges to door thickness and weight, so a thicker door needs a larger model from the range. The 212 is aimed at the lighter closet, cabinet, and panel doors that fall in that 1-1/8 to 1-3/8 band.
2) Can the SOSS 212 hinge be used on an exterior or coastal door?
Yes, that is what the stainless version is for. The 212SS is built in 316 stainless throughout, and SOSS lists exterior, metal, and wood among its applications. 316 is the marine-grade alloy, so it holds up where salt air or washdown would pit a plated hinge. If the opening is dry interior only, the corrosion resistance is not doing anything for you.
3) What mortise prep does a SOSS 212 hinge need, square or radius corners?
Radius corner. The 212 Series is a radius corner type, which means the pocket routes with a standard router bit and does not need the corners chiseled square. Cut one pocket in the door edge and a matching one in the jamb; the hinge sits fully inside both and disappears when the door closes. SOSS publishes a cased jamb detail and a hinge location drawing for the 212 if you want the exact layout before routing.
4) Is the SOSS 212 handed, and how many do I need per door?
Invisible hinges like the 212 are non-handed, so the same part works on a left or right hand door. Quantity is not fixed by the hinge itself, it follows door height and weight, and SOSS publishes a sizing chart and a hinge location drawing for the 212 that give the count and the placement. Note the packaging: the 212SS is sold one hinge per box, priced each, so order the full quantity the chart calls for.
5) What screws come with the SOSS 212 stainless invisible hinge?
Wood screws ship with it. If you are hanging a metal door or a metal jamb, machine screws are the fastener you need and they are an extra item, not included in the box. Worth catching on the order, since the 212 is listed for metal as well as wood applications and the wrong fastener stops the install at the door.
6) Is the SOSS 212 invisible hinge fire rated?
No, the 212 Series carries no fire rating. On a labeled opening in a healthcare, education, or government facility, that rules it out and you need a fire rated hinge instead. For unrated openings, closet doors, panels, and millwork, the rating is not a factor.
7) Does the SOSS 212 invisible hinge let the door open flat against the wall?
It swings a full 180 degrees, single action, so the door lies flat against the adjoining surface when fully open. That is the usual reason people specify an invisible hinge on a closet or panel door in a tight room: no butt hinge knuckle standing proud of the jamb and no leaf blocking the last few degrees of swing.
8) Is a concealed hinge like the SOSS 212 the right choice, or should I use a standard butt hinge?
Pick the invisible hinge when the door face has to read clean with nothing visible at the jamb, on jib doors, closet and panel doors, and flush millwork. The tradeoff is prep: a butt hinge screws to a shallow mortise on the door edge, while the 212 needs a routed pocket in both the door and the jamb, sized off SOSS's chart. If the opening is a normal swing door and appearance is not the driver, a butt hinge is far less work. If the door is thicker than 1-3/8 inches, the 212 is not the model regardless.
9) How much clearance does a door on SOSS 212 invisible hinges need to swing?
Concealed hinges swing on a linked arm rather than a fixed pin, so the door edge travels differently than it does on a butt hinge and the gap at the jamb matters. SOSS publishes a clearance detail and a 90 degree open detail specifically for the 212 that show the swing path and the required gap. Check them against your jamb before you rout, because clearance errors on an invisible hinge cannot be corrected after the pocket is cut.
10) Is the SOSS 212 hinge heavy duty enough for a commercial building?
It is rated commercial and heavy duty, and SOSS points it at office buildings, schools, healthcare, retail, industrial, multi-tenant residential, and municipal work. The limit is not duty level, it is door thickness: at 1-1/8 to 1-3/8 inches this is a lighter door hinge, so for the main swing doors in those buildings you are on a different model. Where it earns its place in a fleet is closets, panels, and millwork doors that need to disappear.
11) Do SOSS 212 invisible hinges need counterbored screw holes in the door?
No counterboring. The 212 does not use counterbored screw holes, so the fasteners seat in the hinge body as supplied and the pocket prep is the routed mortise plus the screw holes. One less step at the bench, and it means the standard SOSS template covers the whole prep.
How fast can I get the SOSS 212SSUS32D delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit, reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the SOSS 212SSUS32D come with a warranty?
Absolutely. The SOSS 212SSUS32D is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the SOSS 212SSUS32D?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
Why buy the SOSS 212SSUS32D from ZenSupply?
ZenSupply makes it easy to get the commercial door hardware you need—fast shipping, expert support, and rewards on every order. Our team is always ready to help you choose the right product for your project.
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