Shower Door Seal for 5/16 Inch Glass
Quick answer
5/16 inch (7.9 mm) glass is an in-between size used on some semi-frameless and lighter frameless doors. Fewer seals are made only for it, so the practical move is a product listed as "fits 5/16 and 3/8 inch": the flexible channel seats snugly on 5/16 after pressing on. Verify with a caliper first — 8 mm import glass is the same size, but 3/8 inch (9.5 mm) is not.
5/16″ glass = 5/16″ · 0.313 in · 7.9 mm
Data reviewed:
Which doors use 5/16″ glass
Semi-frameless hinged doors and mid-weight frameless sliders. Some manufacturers spec 8 mm glass on the moving panel and thicker glass on the fixed panel, so measure the panel that actually needs the seal.
What to measure before buying
- Glass thickness at the bare edge — pull back a section of the old seal first (1/4″, 5/16″, 3/8″, or 1/2″)
- Bottom gap from glass edge to threshold at the HINGE end, door closed
- Bottom gap at the HANDLE end, door closed — note any difference
- Door width along the bottom edge (for trimming the new seal)
- Where the water actually exits: under the door, off a bottom corner, or down a vertical edge
- Photo of the old seal's cross-section before removing it
- Caliper reading on the exact panel being sealed (fixed and moving panels can differ)
- Whether the listing states a 5/16–3/8″ range or 3/8″ only
Seal-type compatibility with 5/16″ glass
| Seal type | Fits 5/16″? | Catalog glass range | Note |
|---|---|---|---|
| Bottom sweep | Yes | 5/16–3/8″ | In our reviewed catalog |
| Drip rail | Check listing | — | No 5/16″ product in catalog yet — verify the stated range |
| Side seal | Check listing | — | No 5/16″ product in catalog yet — verify the stated range |
| Magnetic seal | Check listing | — | No 5/16″ product in catalog yet — verify the stated range |
| Bulb seal | Check listing | — | No 5/16″ product in catalog yet — verify the stated range |
| H-jamb seal | Check listing | — | No 5/16″ product in catalog yet — verify the stated range |
| U-channel seal | Yes | 5/16″ | In our reviewed catalog |
Best seal types for 5/16″ glass
Replacement seals for 5/16″ glass
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Finned U-Channel Shower Glass Seal, 5/16 in Glass, 72 in
- Glass
- 5/16″
- Gap
- 0–3/16″
- Length
- 72″
- Material
- Clear PVC
- Mount
- press-on
- Trim
- Cut to size
Caps and protects the glass edge; the short fin seals even gaps up to about 3/16 in. For wider or tapering gaps step up to a bulb seal.
Frameless Shower Door Bottom Sweep with Drip Rail, 5/16–3/8 in Glass, 1/2 in Wipe, 36 in
- Glass
- 5/16–3/8″
- Gap
- 1/8–3/8″
- Length
- 36″
- Material
- Polycarbonate channel, PVC wipe
- Mount
- press-on
- Trim
- Cut to size
Dual-size channel seats snug on 5/16 in and neutral on 3/8 in glass. The 1/2 in wipe seals gaps of 1/8 in–3/8 in. Cut with a fine-tooth hacksaw.
⚠ On 5/16 in glass press the channel on dry; lubricant makes dual-size channels creep.
Frameless Shower Door Bottom Sweep with Drip Rail, 5/16–3/8 in Glass, 3/4 in Wipe, 36 in
- Glass
- 5/16–3/8″
- Gap
- 3/8–5/8″
- Length
- 36″
- Material
- Polycarbonate channel, PVC wipe
- Mount
- press-on
- Trim
- Cut to size
Dual-size channel seats snug on 5/16 in and neutral on 3/8 in glass. The 3/4 in wipe seals gaps of 3/8 in–5/8 in. Cut with a fine-tooth hacksaw.
⚠ On 5/16 in glass press the channel on dry; lubricant makes dual-size channels creep.
Common buying mistakes
- Assuming any 3/8″ seal will tighten down on 5/16″ glass — single-size rigid channels will not.
- Confusing 8 mm with 3/8″: 8 mm is 0.315″, while 3/8″ is 0.375″. A 1/16″ difference is the difference between snug and loose.
- Buying by door brand instead of measured thickness; brands mix glass sizes across model years.
Frequently asked questions
Is 8 mm glass the same as 5/16 inch?
Effectively yes: 5/16 inch is 7.94 mm. Seals sold for 8 mm glass fit 5/16 inch glass and vice versa.
Will a 1/4 inch seal stretch onto 5/16 inch glass?
No. A 1/4 inch channel is 1/16 inch too narrow; forcing it can crack the vinyl or chip the glass edge. Use a 5/16 inch or dual 5/16–3/8 inch seal.
Which doors use 5/16 inch glass?
Mostly semi-frameless hinged doors and mid-priced frameless sliding systems, where 8 mm glass keeps panels lighter than the 3/8 inch used on full frameless hinged doors.