Concealed Flush Bolt: Size and Material Guide

Allen Wang | CEO and Founder, HIPAD
Updated: October 15, 2026

A concealed flush bolt is one option for securing the inactive leaf of a double-door set. HIPAD’s supplied range lists concealed bolts at 200-350 mm, alongside standard, heavy-duty and decorative families with different published length ranges. Length alone does not establish fit: buyers also need the door section, installation position, strike details and a sample of the complete assembly.

Concealed versus other flush-bolt families

The supplied HIPAD product catalog identifies standard, concealed, heavy-duty and decorative flush bolts. It gives family length ranges and material options but no model-specific capacity, fire rating or certificate number. The table is a sourcing comparison, not an interchangeability claim.

A longer bolt is not automatically a stronger bolt. The door preparation, rod, keeper, fasteners and substrate all affect the installed result. Compare a quoted model with the actual door drawing before approving a substitution.

What does the 200-350 mm concealed range mean?

It describes the length range listed for HIPAD’s concealed flush-bolt family. It is not a promise that every length fits every door. Ask the supplier to identify the exact model, overall length, body width and depth, actuator position, rod projection, mounting-hole pattern and supplied strike. Check these against the inactive leaf and frame or threshold. A plan view alone can miss a conflict inside a narrow stile.

For paired doors, confirm which leaf is inactive and whether top, bottom or both fixing points are specified in the project drawing. The strike should meet the rod without forcing the door out of alignment. Where there is a floor covering, threshold or hardware pocket, test the actual installed condition rather than an empty shop frame.

Material and finish belong on the drawing

The published family includes stainless steel, steel-core and alloy options. These are material categories, not proof that a given model has a particular corrosion grade or finish thickness. Record the actual material and surface treatment for the quoted bolt, strike and visible parts. If hardware must match adjacent door hinges, approve a finish sample under the lighting used for the project.

Ask how the rod, faceplate and fasteners are supplied. A replacement bolt with a similar faceplate can still have a different body depth or throw. This is a frequent sourcing error when buyers rely on a photograph and overall length without a sectional drawing.

When should a heavy-duty variant be considered?

HIPAD lists heavy-duty flush bolts at 250-400 mm. That label identifies a separate family; the supplied reference does not disclose one universal force rating. For a large or frequently operated door, request the exact model drawing and the relevant test or installation evidence. Compare its fixing and strike to the proposed door construction rather than assuming that a longer faceplate solves a weak installation.

Six checks before an OEM order

1. Send the door and frame sections, leaf handing, fixing location and project hardware schedule.
2. Select the family and record the exact model length rather than only a catalog range.
3. Confirm body width and depth, rod travel, strike position, screw centers and available access for operation.
4. State the material and finish for the bolt, strike and exposed components.
5. Fit a production-intent sample to the actual leaf and check closed-door alignment and operation.
6. Approve the drawing, finish sample, packaging and change-control requirements for repeat orders.

HIPAD’s flush-bolt range is the product starting point. The door hardware manufacturer guide e wholesale sourcing checklist cover related supplier-approval questions. For a project that also specifies closing devices, review the separate door controls category.

Domande frequenti

What length concealed flush bolts does HIPAD list?

The supplied catalog lists a 200-350 mm family range. Confirm the exact model and dimensions on the current quotation.

Is stainless steel the only material?

No. The supplied flush-bolt family also lists steel-core and alloy options. Material must be confirmed for the selected part.

Can a standard flush bolt replace a concealed one?

Only after checking the door preparation, actuator access, rod travel, mounting pattern and strike. Similar length does not prove the two formats are interchangeable.

Does a heavy-duty label provide a numeric load rating?

Not in the supplied reference. Ask for model-specific evidence and agree on the project acceptance test.

Request a model-specific quotation

Send the door section, installation location, length target, material, finish and sample criteria through the HIPAD contact page. No universal price or product certificate number is provided in the supplied catalog.

About the author

Allen Wang is CEO and Founder of HIPAD. He began his career in bearing manufacturing and technical engineering in 1998 and works on tooling, product quality and OEM/ODM architectural hardware supply.