Shower Door Seal Size Chart
Shower door seals are sized by the thickness of the glass they grip: almost always 6, 8, 10 or 12 mm (1/4″, 5/16″, 3/8″ or 1/2″). Choose the seal for your glass thickness first, then check that it closes your gap and suits its position on the door. A seal for the wrong thickness either slips off or won’t push on.
Glass thickness: metric and inch equivalents
| Metric | Inch (nominal) | Typical use |
|---|---|---|
| 4 mm | 5/32″ | Older bath screens, framed enclosures |
| 6 mm | 1/4″ | Framed and semi-frameless doors, bath screens |
| 8 mm | 5/16″ | Semi-frameless and frameless doors; very common in Europe |
| 10 mm | 3/8″ | Frameless doors; very common in North America |
| 12 mm | 1/2″ | Heavy frameless doors and fixed panels |
| 15 mm | 9/16″–5/8″ | Architectural and luxury enclosures |
Inch sizes are nominal: 3/8″ glass measures about 9.5 mm, close enough for seals made for 10 mm.
Size chart: seal types by glass thickness
Number of GoldRays models for each combination, with example model numbers, read from our product pages in October 2026. Click a seal type for drawings and dimensions, open the page for your glass thickness (6 mm, 8 mm, 10 mm, 12 mm), or use the seal finder.
| Seal type | 6 mm (1/4″) | 8 mm (5/16″) | 10 mm (3/8″) | 12 mm (1/2″) |
|---|---|---|---|---|
| Bottom seals and sweeps | 12: 007G, 009, 009A, 009A1 +8 | 12: 007G, 009, 009A, 009A1 +8 | 13: 007G, 009, 009A, 009A1 +9 | 7: 009, 009A, 009A1, 009A2 +3 |
| Hinge-side and closing seals (swinging doors) | 6: 003A, 003A2, 005A, 005D +2 | 8: 003A, 003A2, 003B, 003C +4 | 8: 003A, 003A2, 003B, 003C +4 | 6: 003A, 003A2, 003B, 005A +2 |
| Magnetic seals | 17: S008A1W, 008A, 008A1W, 008AW +13 | 18: S008A1W, 008A, 008A1W, 008AW +14 | 15: S008A1W, 008A, 008A1W, 008AW +11 | 11: 008A, 008A1W, 008AW, 008B +7 |
| Sliding door seals | 5: 004, 004A, 007A, 014 +1 | 5: 004, 004A, 007A, 014 +1 | 8: 004, 004A, 007B1, 007F2 +4 | 4: 004, 004A, 013A, 014 |
| Bifold door seals | 2: 006, 006A | 2: 006, 006A | 4: 006, 006A, 006A compact, 006A1 | — |
| Glass-to-glass connectors | 3: 010A, 026, IS180 | 5: 010A, 026, IS180, IS90 +1 | 4: 010A, 029, IS180, HS180 | 4: 010A, 026, IS180, HS180 |
| Universal (multi-position) seals | 12: 001, 002, 003, 004 +8 | 19: 001, 002, 003, 004 +15 | 16: 001, 002, 004, 013D +12 | 9: 001, 003, 004, 013D +5 |
| Slim / compact seals | — | 12: GS003, GS004, GS004A, GS004A2 +8 | 7: GS003, GS004, GS004A, GS004A2 +3 | 1: GS003 |
| SuperClear™ seals | 12: S003, S003A2, S005, S007 +8 | 18: S001, S003, S005, S007 +14 | 19: S001, S003, S005, S005B +15 | 10: S001, S003, S005, S007 +6 |
How to measure (three numbers)
- Glass thickness. Measure the exposed edge with calipers. Don’t rely on paperwork for replacement jobs.
- Gap. Measure the space the seal must close at the top, middle and bottom of the run. Use the largest reading.
- Length. Measure the edge where the seal goes and allow a little extra to trim after a trial fit.
Then note the position (bottom, hinge side, closing edge, between panels) and, for magnetic and glass-to-glass seals, the angle (90°, 135° or 180°). See our full measuring guide.
Glass thickness vs gap: the common mix-up
“For 8 mm glass” tells you which glass a seal grips. It says nothing about the gap it can close. Two seals for 8 mm glass can close very different gaps, so check the gap range on each profile drawing.
Request a quote · Order free samples
Frequently asked questions
What size shower door seal do I need?
The size that matches your glass thickness, usually 6, 8, 10 or 12 mm (1/4″, 5/16″, 3/8″ or 1/2″), and that closes the gap at its position on the door.
Is 3/8 inch the same as 10 mm for shower seals?
Effectively yes. 3/8″ glass is about 9.5 mm thick, and seals sold for 10 mm glass fit it.
Will an 8 mm seal fit 10 mm glass?
No. It won’t push onto the thicker glass. A 10 mm seal on 8 mm glass will be loose and can slide off.
How do I find my glass thickness on an installed door?
Measure the exposed edge with calipers or a fine ruler. On some doors the safety-glass mark etched in a corner also states the thickness.
Can GoldRays supply seals in sizes not listed?
Yes. Send a drawing or a photo of the old seal’s end next to a ruler; we match from more than 3,200 moulds or tool a new profile for about USD 300 to 400.
About the author
GoldRays technical team
The GoldRays technical team writes these guides at the GoldRays factory in Foshan, China, where clear PVC and polycarbonate shower door seals have been made since 2001. The team works with more than 40 production lines and more than 3,200 moulds for 4 to 15 mm glass, and answers trade questions about fit, materials and testing.
This post is also available in:
