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V-Slot extrusion: 20x20, 20x40, 20x60, 20x80 and C-Beam 40x80: slot width, centre bore, mass, section area, second moment

What are the slot width, centre hole and weight per metre of V-Slot 2020, 2040, 2060, 2080 and C-Beam? · Standard part · 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

Also called: v slot 2020 dimensions, v-slot 20x20 slot width, openbuilds v-slot specs, v slot 2040 weight per meter, v-slot 2060 cross section area, v slot extrusion centre hole 4.2, c-beam 40x80 dimensions, v-slot vs t-slot, v slot 2080 moment of inertia, v-slot m5 tap size

Exact dimensions. True size, with no tolerance added.

sizes: 5 in table

Notes

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.

V-Slot extrusion: 20x20, 20x40, 20x60, 20x80 and C-Beam 40x80: slot… size chart

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)	—	—	—	—

Where the files are

Other publishers' files are linked, not hosted. "verify" = check the license at the link before commercial use.

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
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
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
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
Rat Rig	V-Slot 2020: profile 20x20 mm, slot width 6 mm, slot depth 6 mm	web	Retailer page; numbers only
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
Rat Rig	C-Beam: profile 40x80 mm, slot width 6 mm, slot depth 6 mm	web	Retailer page; numbers only
MakerTechStore	C-Beam Linear Rail: considered a 40 mm x 80 mm profile, compatible with all V-Slot parts	web	Retailer page; numbers only
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

Xem scan

File coming

No downloadable true-size file yet: the published figures do not fix the whole shape, and Xem never guesses a number. A measured scan is planned; request it and it moves up.

Let your AI pull this. Add https://xemstudio.com/mcp to Claude, ChatGPT, Cursor or any MCP client (free, no account, one minute) and it can look up exact sizes, mating fits and free STEP/STL from every chat.

Set it up →

Plain text: sheet.txt · JSON: /api/geometry?object=v-slot-extrusion-sizes

Schematic, not to scale.