Hettich Quadro runners share one drawer box platform, IW21, across several generations: the original V6, the 4D V6, today’s 2D V6 and 5D V6, and the heavy duty V6+. The box is the same for all of them except the V6+ height rule. What changes between generations is the front fixing clip, which is why “Hettich” and “Hettich with Quadro locking devices” are two different orders. This guide gives Hettich’s numbers for the box, names the clips by generation and part number, and shows what to pick in our configurator.
Quick answer. Quadro IW21 boxes follow the same rule as Blum 563: inside drawer width equals the cabinet opening minus 42 mm (1-21/32 in), so the outside width is the opening minus 10 mm (13/32 in) with 5/8 in sides or minus 16 mm (5/8 in) with 1/2 in sides. Bottom recess up to 12.7 mm (1/2 in), rear notch 30 mm (1 3/16 in) wide by the recess height, hook hole 6 mm diameter, 10 mm deep, 7 mm (9/32 in) in and 11 mm (7/16 in) up. Maximum side height is the opening minus 20 mm (13/16 in), or minus 26 mm (1 in) on the V6+. Runner generation decides the clip.
The Quadro lineup
| Runner | Drawer sides | Lengths | Load (dynamic / static) | Notes |
|---|---|---|---|---|
| Quadro 2D V6 IW21 | 1/2 or 5/8 in (13 or 16 mm) | 9, 12, 15, 18, 21, 24 in | 90 lb / 100 lb | Current runner. Silent System soft close or Push to open. 1D or 2D front clips. Face frame or frameless. |
| Quadro 5D V6 IW21 | 1/2 or 5/8 in | 9 to 24 in | 90 lb / 100 lb | Same runner with five way front adjustment: height +3, side +/-1.5, depth +2 / minus 1, tilt +4, radial +/-1.5 mm. |
| Quadro 4D V6 IW21 | 1/2 or 5/8 in | 9 to 24 in | 90 lb / 100 lb | Previous generation, 4D catches plus a rear tilt adjuster. Closeout at distributors. With 16 mm sides the inside width rule changes (see below). |
| Quadro V6 IW21 (original) | 1/2 or 5/8 in | 9 to 24 in | 90 lb / 100 lb | Height only clips. |
| Quadro V6+ IW21 | 5/8 in only | 15, 18, 21, 24 in | 130 lb / 170 lb | Heavy duty, frameless only, different height rule. |
| Quadro IW20 | 5/8 in | 280 to 600 mm | 66 lb (distributor figure) | Legacy metric family with a 20 mm installation width; not in Hettich’s current US catalog. Not the same box as IW21. |
| Full Access Quadro (IW21, IW25) | up to 3/4 in on IW25 | 12 to 21 in | 75 lb / 100 lb | Older face frame line. |
All of these are full extension. Hettich has no US product called “Quadro FE”; if a form offers it, it means the full extension V6. Push to open on the 2D and 5D V6 is an add on unit (9 308 679 for 15 to 45 lb drawers, 9 308 678 for 25 to 90 lb) that needs an inside cabinet width over 7-7/8 in and a 3 mm (1/8 in) front gap.
Minimum inside cabinet depth, 2D and 5D V6
| Runner length | Frameless or blocked out | Face frame with metal rear bracket |
|---|---|---|
| 9 in (229 mm) | 242.5 mm (9-17/32 in) | 257 to 294 mm |
| 12 in (305 mm) | 318.5 mm (12-17/32 in) | 333 to 370 mm |
| 15 in (381 mm) | 395 mm (15-17/32 in) | 409 to 446 mm |
| 18 in (457 mm) | 471 mm (18-17/32 in) | 485 to 522 mm |
| 21 in (533 mm) | 547 mm (21-17/32 in) | 561 to 598 mm |
| 24 in (610 mm) | 623.5 mm (24-17/32 in) | blocked out only |
The runner sits 2 mm back from the cabinet front with a 2 mm (3/32 in) front gap. For an inset front the setback is the front thickness plus 3.5 mm (1/8 in).
The drawer box, dimension by dimension
| Dimension | Quadro IW21 (V6, 2D V6, 5D V6, V6+) |
|---|---|
| INSIDE DRAWER WIDTH | opening minus 42 mm (1-21/32 in). Exception: 4D V6 with 16 mm sides uses a 22 mm installation width, so inside width is the opening minus 44 mm. |
| OUTSIDE WIDTH, 5/8 IN SIDES | opening minus 10 mm (13/32 in) |
| OUTSIDE WIDTH, 1/2 IN SIDES | opening minus 16 mm (5/8 in) |
| SIDE THICKNESS | 13 or 16 mm (1/2 or 5/8 in), 16 mm maximum; V6+ 5/8 in only |
| BOX LENGTH | Equal to the runner size, 9 to 24 in |
| BOTTOM RECESS | 12.7 mm (1/2 in) maximum |
| MAX SIDE HEIGHT | opening minus 20 mm (13/16 in); V6+ opening minus 26 mm (1 in) |
| REAR NOTCH, EACH BOTTOM CORNER | 30 mm (1-3/16 in) wide, the runner envelope from the cabinet wall; height to the recess line |
| REAR HOOK HOLE | 6 mm (1/4 in) diameter, 10 mm (3/8 in) deep, centered 7 mm (9/32 in) in from the inside face of the side and 11 mm (7/16 in) above the recess line |
| FRONT CLIP SCREWS | Two #6 x 5/8 in (5/8 in box) or #6 x 3/4 in (1/2 in box) per clip, driven at up to 20 degrees; 1D clips on a 32 mm spacing, 2D clips on a 24 mm spacing; Hettich’s catalog drawing is the template |
| MIN INSIDE DRAWER WIDTH | 95 mm (3-23/32 in) with 1D clips; 130 mm (5-1/8 in) with 2D and 5D clips; 165 mm (6-1/2 in) with original V6 clips; 92 mm (3-5/8 in) with the narrow V6 clips |
| MAX DRAWER WIDTH | 48 in (distributor figure) |
Front fixing clips by runner generation
Hettich calls the locking device a front fixing clip or catch. It slides onto the runner and is screwed to the drawer; the part depends on the runner generation and the side thickness, so tell us both when you order clips.
| Runner | Clip | Part (1/2 in box / 5/8 in box) | Adjustment |
|---|---|---|---|
| 2D and 5D V6 | 1D front mount | 9 306 533 / 9 306 534 | Height +3 mm; 3-23/32 in minimum inside width |
| 2D and 5D V6 | 1D top mount | 9 306 537 / 9 306 538 | Height +3 mm |
| 2D and 5D V6 | 2D front mount | 9 306 535 / 9 306 536 | Height +3 mm, side +/-2 mm; 5-1/8 in minimum inside width |
| 2D and 5D V6 | 2D top mount | 9 306 539 / 9 306 540 | Height, side |
| 2D and 5D V6 | Distributor pack | 9 324 200 (10 left, 10 right, 20 spacers for 1/2 in boxes) | Height +2 mm, side +/-1.5 mm |
| 4D V6 | 4D catch, left / right | 9 183 185 / 9 183 186; packs 9 218 980 (with 1/2 in spacers), 9 218 979 (with tilt adjusters) | Height +2 mm, side +/-1.5 mm; rear tilt adjusters 9 205 924 / 9 205 925 add tilt |
| Original V6 | Standard clip | 9 140 416 (1/2 in) / 9 140 413 (5/8 in) / 9 026 839 (5/8 in with spacers); narrow 9 194 032 / 9 154 442 | Height +2 mm only |
| V6+ | Heavy duty catch | 9 117 483 left, 9 117 485 right, set 9 117 492 | Height +2 mm by knurled wheel |
Rear brackets for face frame cabinets: metal 9 308 864 (2D and 5D V6) or 9 055 093 (4D V6); TennTex plug in sockets 9 308 856 and 9 308 857 (2D) or 1 135 174 (4D); screw on sockets 9 308 854 and 9 308 855 (2D) or 1 135 181 (4D). The V6+ has no bracket and needs a frameless or blocked out side. The bracket does not change the box.
Reading other suppliers’ option names
| Order form phrase | What it means |
|---|---|
| Hettich (notch only) | Box notched and drilled to the IW21 pattern, no clip. You slide on your own catches. |
| Hettich with Hettich Quadro locking devices | The catch for your runner generation installed. On our configurator this is the “Hettich 9144597 Catches” option; because the catch depends on the runner, put your runner generation (V6, 4D V6, 2D or 5D V6, V6+) and side thickness in the order notes and we confirm the part before it ships. |
How to order a Quadro ready box from Gritly
1. Notching
Choose Notched & Drilled For Undermount Slides. The notch and drilling are free.
2. Slide brand and model
Choose Hettich Quadro V6. It covers the V6, 2D V6, 5D V6 and V6+. For a 4D V6 with 5/8 in sides, choose Other or unlisted slide model and type “Hettich 4D V6, 16 mm sides” so the box is cut to the 44 mm rule.
3. Clips
Hettich 9144597 Catches installs the catches for $5.99; add your runner generation and side thickness in the notes. Or choose No Clips and slide on your own.
4. Depth
Match the runner: 9, 12, 15, 18, 21 or 24 in. Whole inches only on notched boxes.
5. Width
Enter the outside box width: the opening minus 13/32 in (10 mm, often written 3/8 in) with our standard 5/8 in sides, minus 5/8 in with 1/2 in sides. We cut exactly what you enter.
6. Height and bottom
Side height at most the opening minus 13/16 in (minus 1 in for V6+), and it must clear your drawer front. The bottom recess is cut to 1/2 in, Hettich’s maximum, with either bottom thickness.
Every other brand we notch for is on the undermount slide guide. Installing for the first time, read how to install undermount drawer slides.
Hettich Quadro questions
Is a Quadro IW21 box the same as a Blum 563 box?
Mostly: opening minus 42 mm inside width, 12.7 mm recess, a 6 mm hook hole at 7 mm and 11 mm, and a 37 mm front screw position all match, but Hettich’s own notch is 30 mm, narrower than Blum’s 35 mm; a Blum prepped box clears it too. Hettich does not name Blum, but distributors sell IW21 as a drop in for Tandem prepped boxes. The clips and rear brackets are Hettich only.
What is the difference between IW20 and IW21?
The installation width, the space the runner takes between the cabinet side and the drawer: 20 mm on the older metric IW20 family, 21 mm on IW21. They are not the same box. Everything Hettich sells in the US today is IW21.
Why do I have to tell you my runner generation for clips?
Because the front fixing clip is not shared across generations. The original V6 clip, the 4D V6 catch, the 2D and 5D V6 clips and the V6+ catch are different parts, and the 2D and 5D clips come in 1/2 in and 5/8 in versions. The notch and hook hole do not change, so the box is safe either way; only the clip has to match.
Does the 24 in Quadro work on a face frame cabinet?
Only blocked out. Hettich’s rear bracket covers 9 to 21 in; the 24 in runner and every V6+ need the cabinet side flush with the frame.
Price one now
Configure a custom drawer box with Hettich Quadro prep and watch the price update as you pick options. True dovetail joinery in Baltic Birch or Hard Maple (Select Grade), built in our Las Vegas shop. Cabinet shops order at tier pricing through the trade portal. We do not stock Hettich runners or clips for separate sale; the catches are installed on the box at the shop.
Sources
Dimensions and part numbers come from Hettich’s Quadro IW21 catalog (January 2025), the Quadro 4D V6 catalog (2017), the Quadro for wooden drawers catalog (2018) and the Full Access Quadro catalog (2016). The IW20 load figure and the 48 in maximum drawer width come from distributor listings, not from Hettich. Check the drawing for your exact runner before cutting anything yourself.
Technical sources
- Hettich: Quadro IW21 catalog, woodworkinstitute.com. Revision: January 2025.
- Hettich: Quadro 4D V6 catalog, web.hettich.com. Revision: 2017.
- Hettich: Quadro for wooden drawers catalog, xcart.wurthlac.com. Revision: 2018.
- Hettich: Full Access Quadro catalog, web.hettich.com. Revision: 2016.
Figures on this page were checked against these documents in October 2026. Our shop’s own rules (the 1 in side mount deduction, the cut list limits) come from how we build.