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Reed switch glass capsule sizes: length and diameter by model (3.95 to 53.4 mm long, Ø1.5 to 5.4)
How long and how wide is the glass capsule of a standard reed switch (KSK-1A66, 14 mm; GR100, 20 mm; 1A52, 21 mm)? · Standard part · basis: Standex Electronics reed switch product guide (via Heilind): maximums as printed
Also called: reed switch dimensions, reed switch size, 14 mm reed switch, 20 mm reed switch, reed switch glass diameter, reed switch length, reed sensor glass 2.2 mm, ksk-1a66 dimensions, gr100 reed switch, reed switch lead diameter, mini reed switch 10 mm, reed switch pocket size
Exact dimensions. Every file is drawn at true size with no tolerance added. The holes and pins that meet another part are listed below under Mating features, with the fit each joint needs; open those by your process's clearance before making the part. Mating features
- sizes
- 30 in table
Notes
- A reed switch is a pair of contacts sealed in a glass capsule; the capsule length and diameter set the sensor pocket, and the leads set the PCB or wire hole. The table is the Standex Electronics reed switch product guide (as hosted by Heilind): glass length and glass diameter are printed as maximums, lead diameter or lead section (width × thickness) as printed. Model names are the maker's part numbers, used as text only.
- Pocket and sensor-holder design: use the maximum length and diameter as the minimum space; leads are not part of the glass length. Gaps between models are real; other makers (Hamlin / Littelfuse, Coto) publish their own sizes and are not covered here.
- Not in the guide read: reed switch body names such as 'MK' or 'HE' families; sealed or moulded reed sensors (which are larger packages); glass lengths in inches. No files: a glass capsule is a cylinder (plain) and no outline beyond length and diameter is published.
- McMaster-Carr does not appear to list bare reed switches under a category the search could reach, so no McMaster link is given.
Reed switch glass capsule sizes: length and diameter by model size chart
| model | glass length, mm (max) | glass Ø, mm (max) | lead Ø or section, mm |
|---|---|---|---|
| KSK-1A04 | 3.95 | 1.5 | 0.8 × 0.15 |
| KSK-1A80 | 7 | 1.8 | 0.3 |
| GP400 | 10 | 1.9 | 0.43 |
| KSK-1A87 | 10 | 2 | 0.4 |
| KSK-1A35 | 10.5 | 2.1 | 1.2 × 0.2 |
| KSK-1A35/1 | 10.5 | 2.1 | 1.2 × 0.2 |
| KSK-1A31 | 11 | 2.2 | 0.5 |
| KSK-1A46 | 12 | 2 | 0.5 |
| GR/GP501 | 12.7 | 2.3 | 0.45 |
| KSK-1A66 | 14 | 2.2 | 0.5 |
| KSK-1A66/3 | 14 | 2.2 | 0.5 |
| KSK-1C90F | 14 | 2.54 | 0.5 |
| KSK-1C90U | 14 | 2.54 | 0.5 |
| GR/GP560 | 14.2 | 2.3 | 0.6 |
| PR560 | 14.2 | 2.3 | 0.6 |
| KSK-1A55 | 16.5 | 2.8 | 0.6 |
| KSK-1A82 | 16.5 | 2.8 | 0.6 |
| GR100 | 20 | 2.5 | 0.6 |
| NL126 | 20.3 | 2.5 | 0.7 |
| PR126 | 20.3 | 2.5 | 0.7 |
| KSK-1A53 | 20.5 | 2.8 | 0.6 |
| KSK-1A52 | 21 | 2.75 | 0.6 |
| KSK-1A85 | 21 | 2.75 | 0.6 |
| KSK-1B85 | 21 | 2.75 | 0.6 |
| KSK-1E85 | 21 | 2.75 | 0.6 |
| KSK-1C10 | 34.3 | 5.16 | 1.01 |
| KSK-1A33 | 52 | 5.4 | 0.5 |
| KSK-1A54 | 53.4 | 5.4 | 1.3 |
| KSK-1A69 | 53.4 | 5.4 | 2.49 × 0.54 |
| KSK-1A83 | 53.4 | 5.4 | 2.49 × 0.54 |
Mating features
Drawn at the exact size. Open press, slide, run and socket features by your process's clearance (tolerances by process); leave designed gaps and clamp fits as drawn.
| feature | exact | mates with | fit | files |
|---|---|---|---|---|
| reed switch glass capsule | length 3.95 to 53.4 and Ø1.5 to 5.4 (maximums, per model) | sensor pocket or bore (use the model's maximums) | slide | all |
Where the files are
Other publishers' files are linked, not hosted. "verify" = check the license at the link before commercial use.
| Standex Electronics (Heilind copy) | Reed switch product guide: glass length max, glass diameter max, lead diameter per model | web | Publisher's page; dimensions are facts |
Xem scan
File coming
No downloadable true-size file yet: the published figures do not fix the whole shape, and Xem never guesses a number. A measured scan is planned; request it and it moves up.
https://xemstudio.com/mcp to Claude, ChatGPT, Cursor or any MCP client (free, no account, one minute) and it can look up exact sizes, mating fits and free STEP/STL from every chat.Plain text: sheet.txt · JSON: /api/geometry?object=reed-switch-glass-sizes
Fits with
Questions
How big is a 14 mm reed switch?
KSK-1A66: glass 14 mm long and 2.2 mm in diameter (both maximum), 0.5 mm leads.
How big is a 20 mm reed switch?
GR100: glass 20.0 mm × Ø2.5 (max), 0.6 mm leads. NL126 / PR126: 20.3 × 2.5.
What is the smallest reed switch in the guide?
KSK-1A04: 3.95 mm × Ø1.5 with 0.8 × 0.15 mm flat leads.