Notched drawer boxes

Drawer box for Grass Dynapro: sizes, notch and hook holes

By Dale McCoy, head of production · Technically reviewed by Tory O’Neal · Updated October 2026

Grass Dynapro is a synchronized undermount runner common in frameless and face frame kitchens, sold in a 16 mm side version and a 19 mm side version, with 2D, 3D, heavy duty and touch to open variants. This page covers the box prep for all of them and the front locking devices, with Grass’s own numbers.

Ready to build it? The configurator cuts this notch free once you pick Grass Dynapro.

The drawer box, dimension by dimension

Grass draws the hook hole from the end of a back panel between the drawer sides. On a dovetailed box the back runs the full width, so the hole sits 7 mm in from the inside face of the side, the same position Blum, Hettich and Salice Progressa use. Grass publishes no bottom panel thickness; our standard 1/4 in and optional 1/2 in bottoms both fit inside the recess range. These numbers are from Grass America’s Dynapro catalog and Dynapro spec sheet.

Clips: do we install one, do we sell one?

Grass Locking Clips on our configurator installs the steel standard devices for $5.99. Grass’s part numbers for this set are F134125000633 (left) and F134125001633 (right); the combined set number is being confirmed with the shop, so order by this configurator option rather than quoting a different Grass part number. The steel device adjusts 3.5 mm in height and 1.5 mm side to side, and needs at least 7 3/32 in of inside drawer width and a 3 9/16 in side height.

We do not stock Grass runners or the plastic, narrow or heavy duty devices for separate sale. For those, choose No Clips in the configurator and put the part number in your order notes; we confirm it before cutting the pre bore to match.

A worked example

Say your cabinet opening is 18 in wide, the runner reads “Dynapro” with a 16 mm side code, and you want our standard 5/8 in sides. Outside width is 18 in minus 10 mm (13/32 in), which is 17 19/32 in. Depth matches the 18 in runner exactly. The opening is 10 1/2 in tall, so a 9 1/2 in box height clears the 7 mm minimum top clearance. On the configurator: Notching “Notched & Drilled For Undermount Slides,” Slide Brand/Model “Grass Dynapro,” Clips “Grass Locking Clips,” Depth Selection “18” Inches (D),” width 17 19/32 in, height 9 1/2 in. For Dynapro 19 or the 3D tilt adapter prep, choose “Other or unlisted slide model” and type “Dynapro 19” or “Dynapro 3D with rear tilt adapters” instead.

Common mistakes

• Ordering Dynapro 19 with the 42 mm width rule. The 3/4 in side version uses the 50 mm rule instead.
• Ordering a 3D tilt box as a standard hook box. Tell us if you need the tilt adapter prep, which replaces the hook hole with a screw pattern.
• Cutting the recess under 10 mm. Grass’s range starts at 10 mm; going shallower can keep the bottom from seating flush.
• Ignoring the clip’s minimum width on a narrow drawer. The steel device needs 7 3/32 in inside; use the narrow device below that.
• Mounting heavy duty or extended runners on a face frame without blocking out the sides. Grass offers no rear bracket for either.

Questions

Is a Grass Dynapro box the same as a Blum 563 box?

Grass makes no compatibility claim, but the published numbers line up closely: both use inside width equal to the opening minus 42 mm and a 6 mm hook hole 7 mm in and 11 mm up. Blum and Grass both call for a 35 mm notch; Grass’s own recess range is 10 to 12.7 mm against Blum’s fixed 13 mm. A box cut to a 35 mm notch and a 12.7 mm recess meets both drawings on paper, but the front locking devices are never interchangeable between the two brands.

What does 3D mean on a Grass Dynapro slide?

Tilt. A 3D runner accepts a rear tilt adjustment adapter on the drawer back, which lets you raise the back of the drawer up to 4 mm so the front sits parallel to its neighbors. A 3D front locking device is a different thing: it adds depth adjustment at the front, and it can run on a 2D runner too.

Which Grass locking device do I need for a narrow drawer?

Below 5 7/8 in inside width, the narrow devices, which fit down to 3 3/4 in with a side as short as 1 7/8 in. The steel device our Grass Locking Clips option installs needs 7 3/32 in inside and a 3 9/16 in side.

Can I put Grass Dynapro heavy duty slides on a face frame cabinet?

Only with the cabinet sides blocked out flush. Grass offers no rear bracket for the 18 to 24 in heavy duty or 27 to 30 in extended runners.

What load is a standard Dynapro runner rated for?

88 lb dynamic and 100 lb static, per Grass’s own technical documents. The heavy duty version is rated 132 lb dynamic and 150 lb static.