1:1 gasket CAD · ASME / EN library · photo tracer · mm / in
Custom Gasket Maker DXF
Length, width, band wall and corner radius make the cover gasket; bolt holes ride the band centreline with optional bosses, offsets and an oil or water passage.
examples
- Outer × inner
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- Bolt pattern
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- Bolt chord S
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- Ligament S − d
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- Hole → bore
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- Hole → outer edge
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- Area
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- Weight
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- Cut outer (+kerf)
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- Cut bore (−kerf)
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- Cut bolt hole
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- Segment box
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- 256 mm print bed
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- Fewest segments that fit
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Hole coordinates · polar & XY from the centre
| Hole | Angle | Radius | X | Y |
|---|
Export
this exact gasketFree proof saved — it is a screen check, not to scale. Unlock the same gasket as a 1:1 layered DXF, kerf SVG, TPU/mold STL and punch PDF with the Pro pack.
Proof width 1000 px · no DPI, not to scale
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How to
Copy a cover gasket from four measurements
- Outer size and cornersOverall length and width of the sealing face, and the outer corner radius.
- Band wallWidth of the sealing band; the inner opening and its corner follow automatically.
- BoltsEven spacing or per side, hole Ø, and a boss radius if the band is narrow.
- Passages and exportOil or water passage under Cover options, then the 1:1 DXF or punch PDF.
Terms
Band, bosses, opening and passage
One drawing explains every field of the cover shape.
The gasket is the band between the outer rounded rectangle and the inner opening, plus a boss circle at every bolt hole, minus the holes and the passage. Bosses can bulge past both edges of the band, and the DXF follows them with exact arcs.
Layouts
Even versus per-side bolt layouts
Even spacing places holes at equal distance along the band centreline, clockwise from the middle of the top edge plus the start offset. On the 180 × 120 mm gearbox example the 10 holes are 53.03 mm apart along the band; the closest straight-line pair is 40.00 mm because two holes sit either side of a corner.
Per-side places n holes on each straight edge at (i + 1)/(n + 1) of its length, plus one hole in the middle of each corner arc. The 220 × 90 mm valve cover uses 4/1/4/1 plus 4 corners — 14 holes.
| Example | Size · opening | Bolt pattern | Min web | Where |
|---|---|---|---|---|
| Rectangular Gearbox / Crankcase Split Cover Gasket | 180.00 × 120.00 mm · opening 152.00 × 92.00 mm | 10 × Ø6.50 on band centreline (even) | 4.0 mm | passage → band edge |
| Oblong Junction Box Lid Seal | 160.00 × 70.00 mm · opening 140.00 × 50.00 mm | 6 × Ø5.40 on band centreline (even) | 3.3 mm | bolt hole → band edge |
| Asymmetric Valve / Side Cover Gasket (per-side bolts) | 220.00 × 90.00 mm · opening 196.00 × 66.00 mm | 14 × Ø6.60 (per side 4/1/4/1 + 4 corners) | 4.7 mm | bolt hole → band edge |
Inner corner rule
Auto inner radius = max(outer R − wall, 0.5 mm). The gearbox cover has R15 outside and a 14 mm wall, so the inner corners are R1.0 — the band stays 14 mm wide around the corner instead of thinning out.
Passages
Oil and water passages
Crankcase and pump covers often carry a drilled oil or coolant passage through the gasket. Enter its diameter and choose the side; the hole sits on the band centreline at the middle of that side. The gearbox example has a Ø6 passage on the left: 4.0 mm of band remains either side, which is its thinnest web.
If the passage is off-centre or not round, trace the old gasket instead — the photo to gasket DXF converter keeps any inner contour as a polyline.
Use cases
Covers people make gaskets for
- Motorcycle and outboard side coversCut NBR or aramid on a laser; offsets per material in the kerf guide.
- Gearboxes and differentialsPrint the cover 1:1 and punch it at home with the template PDF.
- IP-rated enclosuresPrint a TPU lid seal with a bead in the TPU gasket generator.
- Round covers and pump platesUse the circular shape in the gasket DXF generator; check hole spacing with the bolt circle calculator, parameters on the parametric gasket CAD page.
FAQ
Questions from the shop floor
Short, specific answers. Open a question to read it.
Even spacing or per-side holes — which should I use?
Use even spacing when the cover bolts are equally spaced around the band, as on most gearbox and junction-box lids. Use per-side when the long sides have more bolts than the short ones or there is a bolt in each corner; set the count for top, right, bottom and left and tick the corner option.
What are bolt bosses and when do I need them?
A boss is a round pad of extra material around a bolt hole. Covers with a narrow band need them so the hole does not break through the edge. Set the boss radius; the outline and the inner opening grow around each hole. With a 0 mm boss and a Ø10.4 hole in a 14 mm band only 1.8 mm is left, and the studio flags it.
How is the inner corner radius chosen?
On auto it is the outer corner radius minus the wall, but at least 0.5 mm, which keeps the band the same width all the way round. Untick auto under Cover options to set your own, for example a sharp inner corner on a machined cover.
How do I add an oil or water passage?
Open Cover options and enter a passage diameter and side. The passage is a round hole on the band centreline at the middle of that side, written to the INNER_BORE layer. Keep it at least 1 mm smaller than the wall; the web from passage to band edge is checked like a bolt hole.
Can I offset the holes outward or inward?
Yes, Hole offset moves the whole bolt line out (+) or in (−) from the band centreline by up to half the wall. Start offset slides an even pattern along the band so the first hole lands where your cover has it.
My cover is an irregular shape — what then?
Lay the old gasket or the cover face down on paper, photograph it square-on with a ruler and use the photo tracer. The traced outline keeps its exact shape and the bolt holes snap to true circles.
The gasket family
Same engine, a page for each job
Every tool page opens the same studio with its own examples; the guides explain the numbers.