# 4545 aluminum extrusion, 10 mm slot (45-series)

> What are the exact dimensions of 4545 aluminum extrusion?

- Category: Hardware › Framing
- Kind: Hardware
- Basis: Misumi 8-45 series, 10 mm slot, from Misumi's dimensioned drawing of this profile; every slot, lip, cavity, bore and outline number is the drawing's
- Page: https://xemstudio.com/objects/4545-aluminum-extrusion/ · JSON: https://xemstudio.com/api/geometry?object=4545-aluminum-extrusion · Plain text: https://xemstudio.com/objects/4545-aluminum-extrusion/sheet.txt
- License: dimension sheet CC BY 4.0 (Xem Studio); linked files under their publishers' licenses
- Use in every chat: add https://xemstudio.com/mcp as a connector (https://xemstudio.com/use-with-ai/)

## Overall (mm)

| width | height |
|---|---|
| 45.0 | 45.0 |

**Exact dimensions.** Every file is drawn at true size with no printing tolerance. The holes and pins that meet another part are listed below under Mating features, with the fit each joint needs; open those by your printer's or process's clearance before making the part.

## Notes

- 4545 aluminum extrusion, 10 mm slot (45-series): 45 × 45 mm, 4 slots on a 45 mm pitch (Misumi 8-45 series, 10 mm slot). Source: Misumi's dimensioned drawing of this profile. Files: STEP and STL at 100, 1000 mm with square ends, and a DXF of the exact cross-section (mm), the master to extrude to any length. The section is centred on the origin and extruded along +Z from z = 0.
- Slot: opening 10 mm, lip 6 mm thick at the opening, cavity 20 mm wide under the lips, 13 mm from the face to the cavity floor. Centre bore Ø12.5 mm per cell (the largest thread whose tap drill fits inside: M14, 12 mm).
- Cavity side walls: the drawing gives the cavity width (20 mm) and depths but not the web thickness, so the side walls run at 45° from the corner under each lip straight to the floor: the smallest cavity those numbers allow. The bar has at least the real metal there, and a part that fits this cavity fits the real one.
- The four closed corner pockets (9.5 mm, 2 mm in from the faces, notched where the web meets them) are not fully dimensioned and are drawn filled.
- Outer corners R3 (stated).
- Wrapping it: to make a part that fits around the bar, subtract the 1000 mm file (or extrude the DXF) from your solid; the outline is the drawing's 45 × 45 mm with no allowance, so open the pocket by your process's socket fit (see Mating features).
- Attachments: the 45-series (10 mm slot) T-nuts, end caps, feet, brackets, gussets, plates and slot covers are cut from these same numbers; the fit check (tools/asm_extrusion_fit.py) placed each one on this profile with zero overlap.

## Mating features (exact size; open press / slide / run / socket by your process clearance, leave designed and clamp as drawn)

| feature | exact | mates with | fit | files |
|---|---|---|---|---|
| slot opening | 10 | T-nut tongue, slot-cover stem (45-series (10 mm slot)) | slide | all |
| slot cavity | 20 wide under the lips, face to floor 13, lip 6 | T-nut body (slide-in, drop-in) | slide | all |
| centre bore | Ø12.5 | M14 thread (tap drill 12); end-cap pin | designed | all |
| outline | 45 × 45, R3 | end-cap outline, foot socket, a pocket that wraps the bar | socket | all |

## Sizes

| feature | size | from |
|---|---|---|
| outline | 45 × 45 mm, R3 corners | drawing |
| slot pitch | 45 mm | drawing |
| slot opening | 10 mm | drawing |
| lip thickness at the opening | 6 mm | drawing |
| cavity width under the lips | 20 mm | drawing |
| face to cavity floor | 13 mm | drawing |
| cavity depth under the lip (at the cavity wall) | 7 mm | drawing |
| core between opposite floors | 19 mm | pitch − 2 × face-to-floor |
| diagonal web | not given (45° walls from the cavity corner) | assumed minimum cavity |
| centre bore | Ø12.5 mm × 1 | drawing |
| cross-section area | 777 mm² | maker's page |
| mass | 2.1 kg/m | maker's page |
| Ix / Iy | 15.13 × 10⁴ / 15.13 × 10⁴ mm⁴ | maker's page |
| area of this model's section | 1290.6 mm² | computed from the DXF |

## Where the files are

- Misumi: [45x45 Aluminum Extrusion - 8-45 Series, Base 45: product page with the cross-section drawing and section properties](https://us.misumi-ec.com/vona2/detail/110302692140/) — web — Misumi site terms (verify at link)
- Misumi: [4545 dimensioned cross-section drawing](https://us.misumi-ec.com/linked/item/10302692140/img/Screenshot_2024-03-14_105729.jpg) — image — Misumi site terms (verify at link)

## Free STEP/STL (2 parts, CC BY 4.0, Xem Studio)

Index: https://xemstudio.com/files/hardware/4545-aluminum-extrusion/index.json

- 4545-100: [STEP](https://xemstudio.com/files/hardware/4545-aluminum-extrusion/4545-100.step) · [STL](https://xemstudio.com/files/hardware/4545-aluminum-extrusion/4545-100.stl) · [DXF](https://xemstudio.com/files/hardware/4545-aluminum-extrusion/4545-section.dxf) — 4545 aluminum extrusion, 10 mm slot (45-series): 45 × 45 mm section, 100 mm long, square ends; DXF = the exact cross-section in mm
- 4545-1000: [STEP](https://xemstudio.com/files/hardware/4545-aluminum-extrusion/4545-1000.step) · [STL](https://xemstudio.com/files/hardware/4545-aluminum-extrusion/4545-1000.stl) · [DXF](https://xemstudio.com/files/hardware/4545-aluminum-extrusion/4545-section.dxf) — 4545 aluminum extrusion, 10 mm slot (45-series): 45 × 45 mm section, 1000 mm long, square ends; DXF = the exact cross-section in mm

## How it fits

### Parts that fit it
- [Slide-in T-nuts for 20, 30, 40, 45 mm and 1 in, 1.5 in T-slot extrusion](https://xemstudio.com/objects/slide-in-t-nuts/): tongue in the opening, body in the cavity (slide)
- [Drop-in T-nuts for 20, 30, 40, 45 mm and 1 in, 1.5 in T-slot extrusion](https://xemstudio.com/objects/drop-in-t-nuts/): drops through the opening, turns 90° in the cavity
- [L corner brackets for 20, 30, 40, 45 mm and 1 in, 1.5 in T-slot extrusion](https://xemstudio.com/objects/t-slot-corner-brackets/): legs flat on two profile faces at 90°
- [Inside corner gussets for 20, 30, 40, 45 mm and 1 in, 1.5 in T-slot extrusion](https://xemstudio.com/objects/t-slot-gussets/): legs on two profile faces in the inside corner
- [Snap-in slot covers for 20, 30, 40, 45 mm and 1 in, 1.5 in T-slot extrusion (100 mm)](https://xemstudio.com/objects/t-slot-covers/): stem in the slot opening, barb behind the lips
- [Extrusion end feet for 20, 30, 40, 45 mm and 1 in, 1.5 in T-slot extrusion](https://xemstudio.com/objects/t-slot-feet/): profile end in the socket (socket fit)
- [Joining plates, 2 × 3 holes, for 20, 30, 40, 45 mm and 1 in, 1.5 in T-slot extrusion](https://xemstudio.com/objects/t-slot-joining-plates/): holes over the slot centrelines on the profile pitch
- [End caps for every T-slot profile here (20, 30, 40, 45 mm and 1 in, 1.5 in series)](https://xemstudio.com/objects/t-slot-end-caps/): end-cap-45-1x1: pins in the centre bores (press)

### Alternatives
- [4590 aluminum extrusion, 10 mm slot (45-series)](https://xemstudio.com/objects/4590-aluminum-extrusion/): same 45-series (10 mm slot) slot, 45 × 90 mm
- [9090 aluminum extrusion, 10 mm slot (45-series)](https://xemstudio.com/objects/9090-aluminum-extrusion/): same 45-series (10 mm slot) slot, 90 × 90 mm

### Also needed
- [Button head socket screws, M2–M8 (ISO 7380)](https://xemstudio.com/objects/button-head-screws-metric/): M8 screws through brackets into the T-nuts

## Questions

**What is the slot size of 4545 extrusion?**

Opening 10 mm, lip 6 mm, cavity 20 mm wide under the lips and 13 mm deep from the face to the floor, per Misumi 8-45 series, 10 mm slot's drawing.

**What T-nuts fit 4545 extrusion?**

The 45-series (10 mm slot) nuts: slide-in (tnut-slide-45-m8) and drop-in versions, threaded M8 as tap-drill holes, cut to this slot's exact space.

**Can I subtract this file to make a part that fits the extrusion exactly?**

Yes: the outline is exactly 45 × 45 mm with R3 corners; extrude the DXF or subtract the 1000 mm STEP, then open the pocket by your fit.

**How heavy is 4545 extrusion?**

2.1 kg/m, 777 mm² section, as Misumi states. This model's section is larger because closed hollows / cavity details the drawing leaves undimensioned are drawn filled; use the stated weight, not the model's volume.

**What in this model is not taken straight from the drawing?**

Cavity side walls: the drawing gives the cavity width (20 mm) and depths but not the web thickness, so the side walls run at 45° from the corner under each lip straight to the floor: the smallest cavity those numbers allow. The bar has at least the real metal there, and a part that fits this cavity fits the real one. The four closed corner pockets (9.5 mm, 2 mm in from the faces, notched where the web meets them) are not fully dimensioned and are drawn filled.

## Fits with

- [4590 aluminum extrusion, 10 mm slot (45-series)](https://xemstudio.com/objects/4590-aluminum-extrusion/)
- [9090 aluminum extrusion, 10 mm slot (45-series)](https://xemstudio.com/objects/9090-aluminum-extrusion/)
- [Slide-in T-nuts for 20, 30, 40, 45 mm and 1 in, 1.5 in T-slot extrusion](https://xemstudio.com/objects/slide-in-t-nuts/)
- [Drop-in T-nuts for 20, 30, 40, 45 mm and 1 in, 1.5 in T-slot extrusion](https://xemstudio.com/objects/drop-in-t-nuts/)
- [End caps for every T-slot profile here (20, 30, 40, 45 mm and 1 in, 1.5 in series)](https://xemstudio.com/objects/t-slot-end-caps/)
- [L corner brackets for 20, 30, 40, 45 mm and 1 in, 1.5 in T-slot extrusion](https://xemstudio.com/objects/t-slot-corner-brackets/)
- [Button head socket screws, M2–M8 (ISO 7380)](https://xemstudio.com/objects/button-head-screws-metric/)