1545 T-slot extrusion, 1.5 × 4.5 in (15-series inch) — dimension sheet Source: Xem Studio, https://xemstudio.com/objects/1545-t-slot-extrusion-inch/ (CC BY 4.0) Basis: 80/20 Inc. 15 series (1.5 in), from 80/20's dimensioned drawing of this profile; every slot, lip, cavity, bore and outline number is the drawing's Catalog version: 2026-10-20 Overall (mm): width 114.3, height 38.1 - 1545 T-slot extrusion, 1.5 × 4.5 in (15-series inch): 1.5 × 4.5 in, 8 slots on a 1.500 in = 38.100 mm pitch (80/20 Inc. 15 series (1.5 in)). Source: 80/20'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 0.320 in = 8.128 mm, lip 0.160 in = 4.064 mm thick at the opening under a 2° drop-lock slope (0.169 in = 4.281 mm at the cavity wall), cavity 0.810 in = 20.574 mm wide under the lips, 0.484 in = 12.294 mm from the face to the cavity floor. Centre bore Ø0.262 in = 6.655 mm per cell (the largest thread whose tap drill fits inside: 5/16-18, 6.53 mm). - Cavity side walls: the cavity is 0.810 in = 20.574 mm wide under the lips, then follows the diagonal webs (0.160 in = 4.064 mm thick, stated) down to the floor; the webs lie on the cell diagonals (45°), as drawn. - The closed hollows between cells are not fully dimensioned on the drawing, so they are drawn filled: the outline, slots and bores are exact, the bar is heavier than the real one. - The drawing does not dimension the outer corner radii, so the corners are square: a pocket cut from this file clears the real rounded corners. The small alignment grooves on the faces are not dimensioned and are left off (the faces are flat). - 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 1.5 × 4.5 in with no allowance, so open the pocket by your process's socket fit (see Mating features). - Attachments: the 1.5 in 15-series 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. feature size from outline 1.5 × 4.5 in drawing slot pitch 1.500 in = 38.100 mm drawing slot opening 0.320 in = 8.128 mm drawing lip thickness at the opening 0.160 in = 4.064 mm drawing lip underside slope (drop lock) 2° maker's page cavity width under the lips 0.810 in = 20.574 mm drawing face to cavity floor 0.484 in = 12.294 mm drawing cavity depth under the lip (at the cavity wall) 0.315 in = 8.012 mm drawing core between opposite floors 0.532 in = 13.513 mm pitch − 2 × face-to-floor (drawing: 0.531 in) diagonal web 0.160 in = 4.064 mm drawing centre bore Ø0.262 in = 6.655 mm × 3 drawing cross-section area 3.002 in² (1937 mm²) maker's page weight 0.2927 lb/in (3.512 lb/ft; 5.23 kg/m) maker's page (ft and kg/m converted) Ix / Iy 5.6929 / 0.7097 in⁴ maker's page area of this model's section 2970.6 mm² (4.604 in²) computed from the DXF Files elsewhere (not hosted by Xem Studio; license as stated by the publisher): - 80/20 Inc.: 1545: 1.50 x 4.50 T-slotted profile, eight open T-slots: product page with the cross-section drawing and section properties — web — 80/20 site terms [verify license at link] — https://8020.net/1545.html - 80/20 Inc.: 1545 dimensioned cross-section drawing — image — 80/20 site terms [verify license at link] — https://8020.net/media/catalog/product/1/5/1545_dimensional.png Free files (CC BY 4.0, Xem Studio; STEP + STL, 2 parts): https://xemstudio.com/files/hardware/1545-t-slot-extrusion-inch/index.json API: https://xemstudio.com/api/geometry?object=1545-t-slot-extrusion-inch