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This Dorma 7400 series extended spindle inserts are used with thresholds, carpeted floors, terrazzo pans or in cases where more clearance between the door and the floor is required. For use with the Dorma BTS series closers.
Manufacturer Resources
Product Specs
- Subcategory:
- Door Closer Parts & Accessories
- Commercial/Residential:
- Commercial
- Product Type:
- Closer Spindles
- Product Group:
- Door Controls
- Product Subgroup:
- Parts and Accessories
- For Use With:
- BTS Series
- Parts and Accessories Type:
- Replacement Parts
- Product Attribute:
- Parts and Accessories
- Product Model:
- 74010
- Product Category:
- Door Controls
- Department:
- Door Hardware
Dormakaba 74003 – Frequently Asked Questions
1) What is the Dormakaba 7400 extended spindle used for on a BTS floor closer?
The 7400 Series spindle is the extended-length spindle that connects a Dormakaba BTS series floor closer to the door above it when you need extra clearance between the door bottom and the finished floor. Thresholds, carpet, and terrazzo pans all raise the floor line, and the standard spindle runs short. Swapping in a longer 7400 spindle makes up that gap without moving the closer body in the floor.
2) What clearance lengths does the Dorma 7400 closer spindle come in?
Six clearance sizes: 5/16, 1/2, 5/8, 3/4, 13/16, and 7/8 inch. You pick the one that matches the gap you actually have between the underside of the door and the finished floor, measured after the threshold, carpet, or pan is in place. Order the size that closes the gap, not the nearest round number, since the spindle sets the door height over the closer.
3) We are adding carpet over an existing floor closer, do I have to replace the whole closer?
No. The closer body stays in the floor. Adding carpet or a threshold raises the floor line, and the fix is a longer spindle, not a new closer. The 7400 Series extended spindles are replacement parts for BTS series closers and come in clearances from 5/16 up to 7/8 inch, so measure the new gap from the finished floor to the bottom of the door and order that size.
4) How do I measure for the right extended spindle length on a floor closer?
Measure from the finished floor surface, whatever the door actually passes over, up to the bottom edge of the door. That is your required clearance. If a threshold or terrazzo pan sits under the door, measure from the top of it. Match that figure to one of the six 7400 sizes, 5/16, 1/2, 5/8, 3/4, 13/16, or 7/8 inch. Undersize and the door drags, oversize and the top pivot prep no longer lines up.
5) Is the Dorma 7400 spindle a commercial-duty part or for residential doors?
Commercial. The 7400 spindle is a door closer part for BTS floor closers, which are the concealed-in-floor closers used on entrances and glass storefront doors rather than residential interior doors.
6) I need to standardize spindle spares across a building with BTS floor closers, what should I stock?
Stock by clearance, not by door. The 7400 spindle is offered in 5/16, 1/2, 5/8, 3/4, 13/16, and 7/8 inch, so walk the openings and record the floor-to-door-bottom gap at each one. Entrances over bare terrazzo usually land at the short end and anything with a threshold or carpet at the long end. Two or three sizes typically cover a whole building's BTS openings.
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Does the Dormakaba 74003 come with a warranty?
Absolutely. The Dormakaba 74003 is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
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