Flush Bolt Sizes: Bolt Lengths, Dust-Proof Floor Sockets and Magnetic Catches

Updated 2026-11-08 · RAYEN 雷茵

What does a flush bolt do?

On a pair of doors, one leaf opens every day and the other stays shut. The fixed leaf needs holding top and bottom, or the active leaf has nothing firm to close against. A flush bolt sits in the edge of the fixed leaf. When it is thrown, the bolt goes up into the head of the frame or down into the floor. Because it sits flush in the edge, it is hidden when the pair is closed.

We list 3 parts in this group: the bolt, the floor socket it drops into, and a magnetic catch.

What lengths does a flush bolt come in?

D3762 SS is stainless steel, Brushed Stainless, 1” wide. It comes in 6”, 8”, 10”, 12”, 18” and 24” lengths. The photograph shows the bolt with a lever to throw it and a keep plate.

The length is about reach, not strength. On a tall door, a longer bolt at the head brings the lever down to where a hand can reach it. At the foot, a shorter bolt is usually enough. Many pairs use two different lengths, so order each position by its own length.

The width matters for the door edge. A 1” bolt needs an edge that can take a 1” plate with solid material on both sides. On a thin edge or a glazed leaf, check this on the drawing before you order.

Why use a dust-proof floor socket?

The foot bolt drops into a hole in the floor. Left open, that hole fills with dirt and grit, and the bolt stops going home. A floor socket lines the hole and keeps it clean.

D3681 SN is brass, in Brushed Nickel. It is 41mm long, with a Ø24.5mm flange on a Ø19mm body. Plan the floor for it before the finish goes down: the floor needs depth for the body, and the flange sits on the finished surface. Mark the socket position with the doors hung and closed, because a socket even slightly off the bolt line will not take it.

What is the magnetic pin?

D3873 is listed as a magnetic pin. It is a zinc alloy plate, 65 × 22mm, with a body behind it, and it comes in Brushed Nickel, White, Brushed Brass, Matt Black and Brushed Black Nickel. Ask us for the drawing and for the mating part before you plan where it goes. A magnetic catch is a light hold, not a lock, and it does not replace a bolt on a pair of doors.

What should you measure?

• The door height, and the height of the lever you want at the head.
• The thickness and edge width of the fixed leaf.
• The head of the frame, for where the top bolt goes in.
• The floor build-up, for the depth of the floor socket.
• The finish on the rest of the door, so the bolt and socket match.

A worked example: a pair of timber doors into a store room, with a tiled floor. The fixed leaf takes two D3762 SS bolts: a long one at the head so the lever is within reach, and a short one at the foot. At the floor, D3681 SN goes in before the tiles are grouted, set under the bolt line with the doors closed. The 41mm body needs that much depth in the floor build-up.

What to write on the order

Order each position by length, and order the socket with the bolt. For example: Door Flush Bolt, D3762 SS, stainless steel, Brushed Stainless, 1” wide, head 18” and foot 8”. Dust-Proof Socket, D3681 SN, brass, Brushed Nickel. Quantities, price and delivery are confirmed per order. See the hardware accessories, or send us the door elevation.