V-Slot extrusion: 20x20, 20x40, 20x60, 20x80 and C-Beam 40x80: slot width, centre bore, mass, section area, second moment — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/v-slot-extrusion-sizes/  (sheet CC BY 4.0)
Basis: Systeal's four V-Slot listings (mass, area, second moment, bore), Rat Rig and Electrokit listings (slot, alloy, tolerance), MakerTechStore for C-Beam; numbers only. No dimensioned cross-section drawing of a V-Slot profile was reachable, so no profile is drawn
Catalog version: 2026-10-20

Sizes: see table below
- V-Slot is a 20 mm-series aluminium extrusion whose slot has a V-shaped (rather than flat) wall so a V-wheel rides in it; it takes the same M5 and 6 mm-slot accessories as other 20-series extrusions. The pages 2020-, 2040-, 2060- and 2080-aluminum-extrusion on this site draw Misumi's flat-wall 6 mm-slot profile from its dimensioned drawing; this page adds the V-Slot numbers those pages do not have.
- Slot: Rat Rig's 20x20 and C-Beam pages print slot width 6 mm and slot depth 6 mm; Systeal calls all four sizes '6 mm slot (V-SLOT)'. Centre bore: Systeal prints 4.2 mm 'for M5 thread' on all four sizes and warns to check accessory compatibility. The V itself (opening angle, flat width, depth) is not printed by any page read, so it is not on this page.
- Mass, area and second moment are Systeal's own extrusion (EN AW-6063-T5, tolerance EN 755-9, cutting tolerance ±1 mm), not OpenBuilds'. Systeal prints the second moment as 'x axis' and 'y axis' in 10⁴ mm⁴ (20x20: 0.689 and 0.689; 20x40: 1.21 and 4.75; 20x60: 1.73 and 14.73; 20x80: 2.25 and 33.16), converted here to mm⁴; which axis lies along the long side is not stated on the listing, so the labels are as printed. Systeal's 20x20 listing prints 4 slots, 20x40 prints 6, 20x60 prints 8; the 20x80 listing does not print a slot count, so none is shown.
- Alloy and tolerance differ by seller: Systeal EN AW-6063-T5; Electrokit's Rat Rig HW203NRC 6060-T5 with a length tolerance of ±0.25 mm. Both are shown because they are different sellers' products; OpenBuilds' own product pages read for this page (20x20 linear rail) print only the name, price and cutting advice, with no dimensions.
- C-Beam: MakerTechStore calls it a 40 x 80 mm profile that takes all V-Slot parts; Rat Rig prints slot 6 x 6 mm. MakerTechStore's per-length weights (1 lb 2 oz / 2 lb 4 oz / 4 lb 4 oz for 250 / 500 / 1000 mm) do not scale to one mass per metre (4.5 against 4.25 lb/m), so no C-Beam mass is given.
- Not here: any outline, V-wall angle, cavity or web thickness, and the C-Beam's channel dimensions (none were printed in the pages read). McMaster-Carr lists T-slotted framing (6 mm to 10 mm slots and 20 to 160 mm rails) but no V-Slot, so its category is linked only as the nearest family.

profile  slots  slot width × depth (mm)  centre bore (mm)  mass (kg/m, Systeal)  area (mm², Systeal)  second moment mm⁴ (Systeal, as printed)
20x20  4  6 × 6 (Rat Rig)  4.2 (M5 tap)  0.456  169  6 890 (x), 6 890 (y)
20x40  6  6  4.2 (M5 tap)  0.799  296  12 100 (x), 47 500 (y)
20x60  8  6  4.2 (M5 tap)  1.14  423  17 300 (x), 147 300 (y)
20x80  not printed  6  4.2 (M5 tap)  1.48  549  22 500 (x), 331 600 (y)
C-Beam 40x80  —  6 × 6 (Rat Rig)  —  —  —  —

Files elsewhere (not hosted by Xem Studio; license as stated by the publisher):
- Systeal: V-SLOT aluminium profile 20x20 6 mm slot: 169 mm², 0.456 kg/m, centre hole 4.2 mm, EN AW-6063-T5, EN 755-9 — web — Maker listing; numbers only — https://www.systeal.com/en/profiles-20-series/1469-v-slot-aluminium-profile-20x20-6mm-slot-black-anodized.html
- Systeal: V-SLOT aluminium profile 20x40 6 mm slot: 296 mm², 0.799 kg/m, 6 slots, centre hole 4.2 mm — web — Maker listing; numbers only — https://www.systeal.com/en/profiles-20-series/1543-v-slot-aluminium-profile-20x40-6mm-slot-black-anodized.html
- Systeal: V-SLOT aluminium profile 20x60 6 mm slot: 423 mm², 1.14 kg/m, 8 slots, centre hole 4.2 mm — web — Maker listing; numbers only — https://www.systeal.com/en/profiles-20-series/1578-v-slot-aluminium-profile-20x60-6mm-slot-black-anodized.html
- Systeal: V-SLOT aluminium profile 20x80 6 mm slot: 549 mm², 1.48 kg/m, centre hole 4.2 mm — web — Maker listing; numbers only — https://www.systeal.com/en/profiles-20-series/1579-v-slot-aluminium-profile-20x80-6mm-slot-black-anodized.html
- Rat Rig: V-Slot 2020: profile 20x20 mm, slot width 6 mm, slot depth 6 mm — web — Retailer page; numbers only — https://ratrig.com/products/v-slot-2020-standard
- Electrokit (Rat Rig HW203NRC): V-SLOT 2020 natural anodized 500 mm: 6060-T5, length tolerance ±0.25 mm, M5 tap, slot 6 x 6 mm — web — Retailer page; numbers only — https://www.electrokit.com/en/v-slot-2020-natural-anodized-500mm
- Rat Rig: C-Beam: profile 40x80 mm, slot width 6 mm, slot depth 6 mm — web — Retailer page; numbers only — https://www.ratrig.com/c-beam.html
- MakerTechStore: C-Beam Linear Rail: considered a 40 mm x 80 mm profile, compatible with all V-Slot parts — web — Retailer page; numbers only — https://www.makertechstore.com/products/c-beam-linear-rail
- McMaster-Carr: T-slotted framing (McMaster lists no V-Slot profile or V-wheel; this is the nearest family) (free STEP/IGES per part, for your own design use; no redistribution) — STEP, IGES, PDF — McMaster-Carr site terms: personal design use, no redistribution [verify license at link] — https://www.mcmaster.com/products/t-slotted-framing/

No true-size file yet: the published figures do not fix the whole shape; a measured scan is planned.
API: https://xemstudio.com/api/geometry?object=v-slot-extrusion-sizes