Accentra (Yale) 356 Double Cylinder W/Thumbturn inside Mortise Deadbolt

The Accentra Yale 356G is a double-cylinder mortise deadbolt from the ASSA ABLOY Accentra 350 Series, with keyed cylinder control on the exterior and a thumbturn on the interior. The 350 Series mortise deadbolts are heavy-duty locks designed to add deadbolt security to doors already equipped with a primary mortise latch lock. They are not standalone locksets. They are installed as a supplemental security deadbolt in a door that has been prepared with a mortise deadbolt cutout in addition to the primary mortise lock pocket. UL-cUL listed for 3-hour fire doors when used in conjunction with the primary latching device. American Locksets is an authorized Accentra Yale dealer stocking the 356G with same-day shipping and free shipping on all orders over $300.

Also referenced in the field as: Yale 356, Yale 356G, and Accentra 356.

Yale 356G Mortise Deadbolt: Function and How It Operates

The 356 function means the deadbolt is operated by key on the exterior and by thumbturn on the interior. The inside thumbturn retracts the deadbolt for egress but does not project it. To project the deadbolt from the inside, a key is required. This is the critical functional difference from a standard thumbturn-only deadbolt and is important on commercial openings where the deadbolt should not be left projected from the inside without keyed authority.

This configuration uses the classroom function mortise lockbody (lock body part number 50-0357-0001-999) internally.

Yale 356 Mortise Deadbolt Specifications

• SKU: 356 (also known as 356G)

• Function: Deadbolt operated by key outside and key inside. Inside thumbturn retracts deadbolt but does not project it

• Application: Mortise installation. Supplemental deadbolt for doors with primary mortise latch lock

• Door Thickness: 1-3/4 inch (44mm) standard

• Backset: 2-3/4 inch (70mm) only

• Deadbolt: Laminated stacked steel with hardened steel pin. 1 inch (25mm) throw

• Front Plate: 4-5/8 inch x 1-1/8 inch (117mm x 29mm). Brass, bronze, or stainless steel. Adjustable for flat or beveled-edge doors with 1/8 inch bevel adjustment in 2 inches (3mm in 51mm)

• Case: Heavy wrought steel, zinc plated and dichromated

• Handing: Non-handed, easily field reversible

• Door Prep: Conforms to ANSI/BHMA A156.115 for steel doors and steel frames. Conforms to ANSI/BHMA A156.115-W for wood doors with wood or steel frames

• Fire Rating: UL-cUL listed for use on fire doors rated up to and including 3 hours when used with the primary latching device. cUL listed for wood fire doors rated up to and including 90 minutes

Yale 356G vs. Other Yale 350 Series Deadbolts: Which Function Is Right

The 350 Series covers several deadbolt function variants, and the 356 occupies the double-cylinder-with-interior-thumbturn position in the lineup. Understanding the differences prevents ordering the wrong function:

The Yale 351 is a pure double cylinder lock: keyed exterior and keyed interior only, no thumbturn at all. The 352 is the most common configuration: keyed exterior and thumbturn-only interior, allowing thumbturn projection and retraction from inside. The 354 is thumbturn-only on both sides for exit-only applications. The 356 is the keyed exterior plus thumbturn interior configuration where the thumbturn retracts but does not project the deadbolt.

The 356 is the correct specification when the hardware schedule requires keyed authority to project the deadbolt from the inside, while still allowing a quick thumbturn retraction for egress. This is common on exit access doors in secured institutional environments, on doors between secure and non-secure zones, and on hotel corridor doors where the inside deadbolt should not be projected without a key.

Browse all Accentra Mortise Deadbolts 350 Series, the complete Mortise Deadbolts catalog, and all Commercial Deadbolts at American Locksets.