Deltana SPDP35S Dust Proof Strike, 3-1/2" x 1-5/8", with Safety Lock, Solid Brass

A dust proof strike is the floor strike that receives the bottom flush bolt or vertical rod on the inactive leaf of a pair of doors. It gets mortised into the floor or threshold so the bolt drops into a clean pocket instead of a bare hole. The SPDP35S has a spring-loaded cover, the safety lock feature, so the pocket stays closed and free of dirt and grit when the bolt is retracted, then pushes down out of the way when the bolt drops. That is what keeps the inactive leaf latching properly in a busy commercial entry where debris otherwise packs the hole.

It depends on where the bolt lands. Inside a building, on a clean sealed floor, a plain open strike works. At an exterior entry, a loading corridor, a school hallway, or anywhere the floor gets swept, mopped, or tracks grit, the open pocket fills and the bottom bolt stops seating. That is the failure that gets called in as "the inactive leaf will not lock." The SPDP35S carries the safety lock cover for exactly that condition, and it is specified for commercial use.

Match the strike to what the manufacturer calls for on an exit device. Vertical rod devices have a specific bottom rod and bolt geometry, and device makers publish their own bottom strike for it: for Detex 50 Series surface vertical rod devices, that is the Detex 96B Strike Kit from the 90 Strike Series. Use the SPDP35S where the bolt is a manual or automatic flush bolt on a pair of doors rather than part of a rod device assembly.

Both are dust proof strikes for the floor at a flush bolt or vertical rod bottom bolt. The Deltana SPDP35S is a solid brass strike with a 3-1/2 inch by 1-5/8 inch face plate and a safety lock feature, sold in eight finishes including polished brass, oil rubbed bronze, brushed nickel, antique nickel, polished chrome, brushed chrome, antique brass, and PVD polished brass. The Trimco 3911 Series is an adjustable dust proof strike, so the plunger height is set after installation rather than fixed. Pick the Deltana where the finish needs to match visible brass or bronze trim on the opening, and the Trimco 3911 where floor height varies and the strike needs adjustment on site.

Solid brass, both the body and the substrate. That matters for a floor-mounted part more than most hardware, because it sits where mop water, salt, and floor cleaner collect. Brass will not rust out the way a plated steel strike does in an entry vestibule or a washdown area.

Eight finishes: PVD Polished Brass, Polished Brass, Antique Brass, Oil Rubbed Bronze, Brushed Nickel, Antique Nickel, Polished Chrome, and Brushed Chrome. That covers the common Deltana finish families, so the floor strike can be ordered to match the flush bolts, hinges, and trim already on the opening. The PVD Polished Brass is the one to specify if you want the brass look to hold up on a floor part, since PVD resists the wear that untreated polished brass shows underfoot.

The SPDP35S is a fixed-depth strike, so it wants the prep cut to the correct depth and the bolt landing where it should. If your floor has settled or the bolt engagement varies from door to door across a building, an adjustable strike solves that instead: the Trimco 3911 Series adjustable dust proof strike is built for it. Use the Deltana where the prep is sound and you want a solid brass plate in a matching finish.

Yes, one model number covers every opening, and the only thing that changes per door is finish. Every SPDP35S has the same 3-1/2 x 1-5/8 inch plate and the same solid brass build, so the floor prep is identical from door to door and your crews cut one dimension. If different areas of the building run different trim finishes, you can order the same strike in eight finishes without changing the prep or the part number.

For an uneven or out of level floor, the Trimco 3911 Series adjustable dust proof strike is the one to look at, because the 3911 is built as an adjustable strike and can be set to the plunger depth the opening actually needs. The Deltana SPDP35S is a fixed solid brass strike with a 3-1/2 inch by 1-5/8 inch face, which suits a floor prepped flat to the plate. If the pair of doors sits on a level threshold or a mortised prep, the SPDP35S works and gives you a matching brass finish across the eight finishes it comes in.

They usually take two different strikes. Openings with Detex 50 Series surface vertical rod exit devices take the Detex 96B Strike Kit, the bottom dust proof strike in the Detex 90 Strike Series, because it is matched to that device. Door pairs with manual flush bolts take a general dust proof strike such as the Deltana SPDP35S in solid brass with a 3-1/2 inch by 1-5/8 inch plate, or the Trimco 3911 Series where an adjustable strike is wanted. Standardize on the Deltana across the flush bolt openings so the floor plate finish matches the rest of the brass trim, and carry the Detex kit only for the exit device doors.

Each. The price shown is per unit, so a pair of doors needing one bottom bolt takes one strike, and a pair with bolts at both leaves takes two. Count openings, not doors, when you build the order.