DAB645 DOUBLE ACTION SPRING HINGE 4 1/2 x 6
DAB645 Double-Action Spring Hinge, Nominal 4-1/2" x 6"
Usually Ships: 1-3 Business Days
The Cal-Royal DAB645 is a steel double-acting spring hinge for compatible doors that need to swing in either direction and return toward the center position. Unlike a single-acting spring hinge, it supports two-way door operation. Select the complete hinge arrangement using the manufacturer's door-size and weight limits, not the nominal hinge size alone.
Practical Uses
- Restaurant service openings: Allow a compatible service door to swing in either direction where the opening is designed for two-way traffic.
- Utility and back-of-house areas: Provide spring-assisted return toward center without requiring a conventional one-way swing.
- Replacement projects: Replace suitable double-action hardware after checking the actual mounting dimensions, door thickness, frame geometry, and hinge spacing.
Everyday example: Staff passing between a service area and dining room can move through a properly configured door from either direction. After release, the adjusted springs bring the door back toward center. The installer checks clearances, return action, and the complete opening before use.
Door Size and Hinge Selection
- Two-hinge arrangement: Manufacturer cutsheet lists a door up to 75 lb and 2'8" wide.
- Three-hinge arrangement: Manufacturer cutsheet lists a door up to 107 lb and 3'0" wide.
- Listed door height and thickness: The capacity table identifies 7'0" height and 1-3/4" thickness.
- Edge restriction: Do not use on doors with a beveled hinge edge.
These are arrangement-specific references, not per-hinge capacities. Confirm suitability for the actual door, traffic, frame support, and operating conditions; do not extrapolate these limits to larger doors.
Installation and Spring Adjustment
Use the DAB645 documents: The manufacturer catalogs this as full-mortise, template-type hardware, while its installation instructions permit the door leaf to be mortised or surface applied to the door edge. Follow the documented configuration appropriate to the opening rather than assuming ordinary butt-hinge preparation.
Check dimensions before cutting: The catalog/listing uses the nominal 4-1/2" x 6" designation. The dimensioned template includes larger overall assembly measurements, including 8.102". Do not treat the nominal size as the overall envelope or a cutout size. Compare the complete drawing, flange positions, clearances, and hole pattern with the supplied hinge.
Remove tension before mounting: Follow the instructions to control each barrel with the tension rod and remove the tension pin. Align the door centerline with the frame centerline, use the specified hinge locations, and secure the frame leaf. For paired doors, the instructions show adjustment heads upward on one door and downward on the opposite door; shimming may be needed for alignment.
Observe the tension limit: With the door closed, support it plumb as instructed. Use the illustrated direction of rotation, insert the tension pin, and remove the rod. Do not exceed five holes of tension. The instructions recommend only one hole of tension for bottom hinges. Follow the specific top-hinge adjustment guidance and test return action after adjustments.
Confirm fasteners: Catalog and template fastener references differ. The catalog lists 12-24 x 1/2" machine screws and #12 x 1-1/4" wood screws, while the template contains a “1/4" x #12” screw note. Confirm supplied screws, frame threads, and mounting requirements before drilling or substituting fasteners.
Test both directions: Check full travel, clearances, alignment, return toward center, and opening effort from both sides. Use manufacturer-approved lubrication if needed. Keep the loaded mechanism controlled during adjustment.
Problems It Helps Address
- A one-way hinge on a two-way opening: Double action permits swing in either direction on a compatible door/frame arrangement.
- A door left away from center: Adjustable spring action assists return after passage.
- Replacement uncertainty: Model-specific capacity and preparation documents help check the installation before altering the opening.
Important limitations: DAB645 is not a hydraulic door closer, door stop, security lock, or positive-latching device. Spring return alone does not establish accessibility, fire-rating, or egress suitability. Confirm any special requirements for the complete opening. A previous comparison to Bommer 3029-6x4.5 should not be treated as a guaranteed direct replacement without checking both manufacturers' current dimensions and preparation.
Product Details
- Part number: DAB645
- Action: Double acting, spring-assisted return toward center
- Nominal catalog size: 4-1/2" x 6"; use the full template for installed dimensions
- Catalog leaf thickness: .134"
- Material: Steel
- Mounting reference: Full mortise/template type, with door-leaf surface application permitted by the installation instructions
- Listed door thickness: 1-3/4"
- Restriction: Not for beveled hinge-edge doors
Offered Finishes
US1-Matte Black, US26D-Satin Chrome, US4-Satin Brass, and USP-Primed Gray. Plated finish names do not establish solid-brass construction.
