{ "version": "2026-10-20", "license": "Dimension sheets: CC BY 4.0. Standard and published-size files: CC BY 4.0. Xem Studio's own designs (files_license = Xem Studio Design License): free to use and sell things from, not to redistribute as files — https://xemstudio.com/license/. Other publishers' files: their own license, linked beside them.", "slug": "glass-cartridge-fuses-5x20-and-6-3x32", "name": "Glass cartridge fuses 5 × 20 mm and 6.3 × 32 mm (1/4 × 1-1/4 in): size, panel holder panel thickness", "kind": "standard", "category": "Electronics", "group": "Wiring & connectors", "year": null, "question": "What are the sizes of 5×20 mm and 6.3×32 mm (1/4 × 1-1/4 inch, 3AG) glass fuses, and how thick a panel does a panel fuse holder take?", "tags": [ "fuse", "glass fuse", "cartridge fuse", "5x20", "6.3x32", "3ag", "agc", "fuse holder", "panel mount", "car" ], "aliases": [ "5x20 fuse dimensions", "5x20mm fuse size", "6.3x32 fuse", "6x30 fuse", "1/4 x 1-1/4 fuse", "3ag fuse dimensions", "agc fuse size", "glass fuse size", "panel mount fuse holder cutout", "5x20 fuse holder panel cutout", "fuse holder panel thickness", "littelfuse 345 fuse holder", "schurter fpg1" ], "overall_mm": { "length": null, "width": null, "height": null }, "official_cad": false, "xem_status": "not-scanned", "les": false, "free_files": 0, "url": "https://xemstudio.com/objects/glass-cartridge-fuses-5x20-and-6-3x32/", "sheet_txt": "https://xemstudio.com/objects/glass-cartridge-fuses-5x20-and-6-3x32/sheet.txt", "sheet": { "basis": "Fuse designations (the size is the name) from Digi-Key, Schurter and Littelfuse pages; panel thickness figures only where labelled; cut-outs deliberately omitted", "overall_mm": { "length": null, "width": null, "height": null }, "notes": [ "The two cartridge fuse sizes are named by their body diameter and length: 5 × 20 mm and 6.3 × 32 mm. The 6.3 × 32 mm size is the metric name for the inch 1/4 × 1-1/4 in fuse that Digi-Key's AGC listing says fits holders for '3AB, 3AG, 1/4 in x 1-1/4 in'. The 31.75 mm and 6.35 mm shown are exact conversions of 1-1/4 in and 1/4 in; the sources print the metric names 6.3 × 32 for the same fuse. End-cap length and body length are not published in the pages read.", "Panel holders: Schurter's FPG1 closed holder for 5 × 20 mm prints a maximum panel thickness of 6 mm. Littelfuse's 345 series enclosed holder (3AB, 3AG and 5 × 20 mm fuses) prints a panel thickness from .032 in to .310 in. Its text also carries '1/2-32 (2A) double-lead thread' next to the mounting-hole drawings, but the cut-out diameter and flat could not be read with a label.", "Panel cut-outs left out on purpose: Schurter's catalogue prints 11.7, 12, 12.7 and 13 mm figures next to FPG1 / FPG2 / FEF holders and the Littelfuse sheet prints .65 in and .558 in hex, but the copies read lose the labels (hole, flat, nut), so no cut-out is stated. Use the holder's own drawing; this site will add the cut-out when a labelled figure is read.", "No files: a cartridge fuse is a cylinder (plain), and the holders' outlines were not readable.", "McMaster-Carr links (glass tube fuses and panel-mount holders) are below." ], "table": { "columns": [ "fuse size", "body Ø, mm (designation)", "length, mm (designation)", "inch form", "panel holders read (maker figure)" ], "rows": [ [ "5 × 20 mm (IEC / European)", "Ø5", "20", "5 × 20 mm", "Schurter FPG1 (panel thickness max 6 mm); Littelfuse 345 (panel .032 to .310 in = 0.81 to 7.87 mm)" ], [ "6.3 × 32 mm (1/4 × 1-1/4 in, '3AG' / 'AGC' class)", "Ø6.3", "32", "1/4 × 1-1/4 in = Ø6.35 × 31.75 mm (inch to mm conversion)", "Littelfuse 345 (same holder family accepts 3AB, 3AG and 5 × 20 mm)" ] ] } }, "sheet_text": "Glass cartridge fuses 5 × 20 mm and 6.3 × 32 mm (1/4 × 1-1/4 in): size, panel holder panel thickness — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/glass-cartridge-fuses-5x20-and-6-3x32/ (sheet CC BY 4.0)\nBasis: Fuse designations (the size is the name) from Digi-Key, Schurter and Littelfuse pages; panel thickness figures only where labelled; cut-outs deliberately omitted\nCatalog version: 2026-10-20\n\nSizes: see table below\n- The two cartridge fuse sizes are named by their body diameter and length: 5 × 20 mm and 6.3 × 32 mm. The 6.3 × 32 mm size is the metric name for the inch 1/4 × 1-1/4 in fuse that Digi-Key's AGC listing says fits holders for '3AB, 3AG, 1/4 in x 1-1/4 in'. The 31.75 mm and 6.35 mm shown are exact conversions of 1-1/4 in and 1/4 in; the sources print the metric names 6.3 × 32 for the same fuse. End-cap length and body length are not published in the pages read.\n- Panel holders: Schurter's FPG1 closed holder for 5 × 20 mm prints a maximum panel thickness of 6 mm. Littelfuse's 345 series enclosed holder (3AB, 3AG and 5 × 20 mm fuses) prints a panel thickness from .032 in to .310 in. Its text also carries '1/2-32 (2A) double-lead thread' next to the mounting-hole drawings, but the cut-out diameter and flat could not be read with a label.\n- Panel cut-outs left out on purpose: Schurter's catalogue prints 11.7, 12, 12.7 and 13 mm figures next to FPG1 / FPG2 / FEF holders and the Littelfuse sheet prints .65 in and .558 in hex, but the copies read lose the labels (hole, flat, nut), so no cut-out is stated. Use the holder's own drawing; this site will add the cut-out when a labelled figure is read.\n- No files: a cartridge fuse is a cylinder (plain), and the holders' outlines were not readable.\n- McMaster-Carr links (glass tube fuses and panel-mount holders) are below.\n\nfuse size body Ø, mm (designation) length, mm (designation) inch form panel holders read (maker figure)\n5 × 20 mm (IEC / European) Ø5 20 5 × 20 mm Schurter FPG1 (panel thickness max 6 mm); Littelfuse 345 (panel .032 to .310 in = 0.81 to 7.87 mm)\n6.3 × 32 mm (1/4 × 1-1/4 in, '3AG' / 'AGC' class) Ø6.3 32 1/4 × 1-1/4 in = Ø6.35 × 31.75 mm (inch to mm conversion) Littelfuse 345 (same holder family accepts 3AB, 3AG and 5 × 20 mm)\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- Digi-Key: AGC 20 A glass fuse: fits holders for 3AB, 3AG, 1/4 in x 1-1/4 in — web — Publisher's page; dimensions are facts — https://www.digikey.com/en/products/detail/eaton-electronics-division/AGC-20-R/1876764\n- Schurter: FPG1 closed panel fuseholder for 5 x 20 mm: panel thickness max 6 mm — web — Publisher's page; dimensions are facts — https://nl.schurter.com/datasheet/FPG1\n- Littelfuse (chipsmall copy): 345 series panel mount enclosed fuse holders: 3AB, 3AG, 5 x 20 mm; panel .032 in min / .310 in max — web — Publisher's page; dimensions are facts — https://datasheet.chipsmall.com/03450121H/391772.pdf\n- Schurter: Fuseholders catalogue (panel mounting hole figures printed without readable labels; not used) — web — Publisher's page; dimensions are facts — https://www.acomee.com.mx/catalogos/catalogoss/SCHURTER FUSEHOLDERS.pdf\n- McMaster-Carr: Fast-acting glass tube fuses (free STEP/IGES per part, for your own design use; no redistribution) — STEP, IGES, PDF — McMaster-Carr site terms: personal design use, no redistribution [verify license at link] — https://www.mcmaster.com/products/fuses/fast-acting-glass-tube-fuses/\n- McMaster-Carr: Panel-mount fuse holders (free STEP/IGES per part, for your own design use; no redistribution) — STEP, IGES, PDF — McMaster-Carr site terms: personal design use, no redistribution [verify license at link] — https://www.mcmaster.com/panel-mount-fuse-holders\n\nNo true-size file yet: the published figures do not fix the whole shape; a measured scan is planned.\nAPI: https://xemstudio.com/api/geometry?object=glass-cartridge-fuses-5x20-and-6-3x32\n", "sources": [ { "publisher": "Digi-Key", "title": "AGC 20 A glass fuse: fits holders for 3AB, 3AG, 1/4 in x 1-1/4 in", "url": "https://www.digikey.com/en/products/detail/eaton-electronics-division/AGC-20-R/1876764", "formats": [ "web" ], "license": "Publisher's page; dimensions are facts", "license_verified": true, "hosted": false }, { "publisher": "Schurter", "title": "FPG1 closed panel fuseholder for 5 x 20 mm: panel thickness max 6 mm", "url": "https://nl.schurter.com/datasheet/FPG1", "formats": [ "web" ], "license": "Publisher's page; dimensions are facts", "license_verified": true, "hosted": false }, { "publisher": "Littelfuse (chipsmall copy)", "title": "345 series panel mount enclosed fuse holders: 3AB, 3AG, 5 x 20 mm; panel .032 in min / .310 in max", "url": "https://datasheet.chipsmall.com/03450121H/391772.pdf", "formats": [ "web" ], "license": "Publisher's page; dimensions are facts", "license_verified": true, "hosted": false }, { "publisher": "Schurter", "title": "Fuseholders catalogue (panel mounting hole figures printed without readable labels; not used)", "url": "https://www.acomee.com.mx/catalogos/catalogoss/SCHURTER FUSEHOLDERS.pdf", "formats": [ "web" ], "license": "Publisher's page; dimensions are facts", "license_verified": true, "hosted": false }, { "publisher": "McMaster-Carr", "title": "Fast-acting glass tube fuses (free STEP/IGES per part, for your own design use; no redistribution)", "url": "https://www.mcmaster.com/products/fuses/fast-acting-glass-tube-fuses/", "formats": [ "STEP", "IGES", "PDF" ], "license": "McMaster-Carr site terms: personal design use, no redistribution", "license_verified": false, "hosted": false }, { "publisher": "McMaster-Carr", "title": "Panel-mount fuse holders (free STEP/IGES per part, for your own design use; no redistribution)", "url": "https://www.mcmaster.com/panel-mount-fuse-holders", "formats": [ "STEP", "IGES", "PDF" ], "license": "McMaster-Carr site terms: personal design use, no redistribution", "license_verified": false, "hosted": false } ], "xem": { "status": "not-scanned", "sheet_free": true, "mesh_price_usd": null, "step_price_usd": null, "tolerance_mm": null }, "related": [ "automotive-blade-fuses-iso-8820-3", "panel-cutouts", "rocker-switch-panel-cutouts", "terminal-blocks", "wago-221-lever-connectors" ], "fits": [], "dimensions": "exact (nominal, no tolerance added)", "dimension_rule": "All geometry on Xem Studio is exact (nominal, true size) with no tolerance added. Where a part meets another part, the object lists its mating features (feature, exact size, what it mates with, fit class: press, slide, run, socket, clamp or designed). Apply your process's allowance to those features only; 'designed' gaps are part of the design and stay as drawn. Typical accuracy by process and ISO 286 fits: https://xemstudio.com/tolerances/", "mating": [ { "feature": "5 × 20 mm cartridge fuse", "exact": "Ø5 × 20", "mates": "5 × 20 fuse holder clips (holder maker's drawing governs)", "fit": "designed", "files": "all" }, { "feature": "6.3 × 32 mm (3AG) cartridge fuse", "exact": "Ø6.35 × 31.75 (1/4 × 1-1/4 in)", "mates": "3AG / 3AB fuse holder (holder maker's drawing governs)", "fit": "designed", "files": "all" } ], "fit_classes": { "press": "stays put: pin, tube, bearing or magnet held by interference. ISO 286 equivalent: H7/p6 (locational interference) or tighter.", "slide": "assembles by hand and is held by a grub, pinch or clamp: shaft in a hub, rod in a socket, spigot in a bore. ISO 286 equivalent: H7/g6 or H7/h6.", "run": "turns or slides in use: pin in a link, rod through a guide. ISO 286 equivalent: H8/f7 (close running).", "socket": "large sliding fit: syringe barrel, sleeve, bobbin in a bore. ISO 286 equivalent: H9/d9 (free running) or looser.", "clamp": "split part that closes on the mating part with screws: make it at size.", "designed": "a gap that is part of the design (piston fit option, displacer gap, air gap): do not change." }, "faq": [ { "q": "What size is a 3AG fuse in mm?", "a": "1/4 × 1-1/4 in = Ø6.35 × 31.75 mm, usually written 6.3 × 32 mm." }, { "q": "What size is a 5x20 fuse?", "a": "Ø5 mm × 20 mm." }, { "q": "How thick a panel does a 5x20 panel fuse holder take?", "a": "Schurter FPG1: up to 6 mm. Littelfuse 345: .032 to .310 in (0.81 to 7.87 mm)." } ], "files_license": null, "offers": [], "markdown": "https://xemstudio.com/objects/glass-cartridge-fuses-5x20-and-6-3x32/index.md" }