{ "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": "gas-spring-end-fittings", "name": "Gas spring end fittings: eyelet and fitting threads M3.5–M14, ball studs Ø8 / Ø10 / Ø13 (M4–M10), ball sockets and forks", "kind": "standard", "category": "Hardware", "group": "Bearings, rails & motion", "year": null, "question": "What thread do gas spring end fittings use, and what size is the 10 mm ball stud and ball socket?", "tags": [ "gas spring", "ball socket", "ball stud", "eyelet", "end fitting", "10 mm ball", "lift support", "strut" ], "aliases": [ "gas strut end fitting thread", "10 mm ball socket gas spring", "gas spring ball stud M8", "ball stud M6 10 mm", "gas strut eyelet M8", "DIN 71803 ball stud", "gas spring fork end", "13 mm ball stud M10", "Kugelpfanne Gasfeder" ], "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/gas-spring-end-fittings/", "sheet_txt": "https://xemstudio.com/objects/gas-spring-end-fittings/sheet.txt", "sheet": { "basis": "McMaster-Carr's eyelet end-fitting thread table, Lesjöfors' ball stud list (ball diameter, thread, thread length, spanner width), and nb-parts' end-fitting list by thread; numbers only", "overall_mm": { "length": null, "width": null, "height": null }, "notes": [ "McMaster-Carr eyelet fittings screw onto the gas spring end thread: M3.5 × 0.6, M5 × 0.8, M6 × 1, M8 × 1.25, M10 × 1.5 and M14 × 1.5 (mm) in zinc alloy, zinc-plated steel, 303 / 316 stainless, aluminum or nylon, with the part numbers shown. The page tells the buyer to match the fitting's thread to the spring's rod and end thread, and each fitting adds its own length to the extended and compressed lengths (see gas-springs-series-and-strokes).", "Lesjöfors ball studs (d1 = ball diameter, thread, thread length l2, spanner width SW, in mm): BS1 Ø8 M4, BS2 Ø10 M6, BS3 and BS6 Ø10 M8 (steel and AISI 303), BS5 Ø13 M10 and BS7 Ø13 M8, as read from the page. So the common '10 mm ball' stud comes with an M6 or M8 thread; the 13 mm ball with M8 or M10.", "Ball sockets: a Stabilus catalogue caption names 'ball studs according to DIN 71803 Ø10' as the mating stud for its ball-socket brackets, and McMaster's fitting assortments list ball sockets for 10 mm, 13 mm and 16 mm balls; no socket dimension table was readable, so socket depth and snap force are not given. A machine reading of McMaster's fitting-assortment table mixed the socket's thread with the stud's (a 5/16-18 stud thread appeared next to metric sockets); those stud threads are not used.", "nb-parts' list is by gas-spring end thread (M5 to M14): the catalogue names ball sockets (WG, KP), eyelets, forks (G), plastic sockets (PKP) and spacers with the sizes in each designation. The designations are the maker's; read the maker's table for the dimensions.", "Related: RAM-style ball sizes (ram-mount-ball-sizes) and the 17 mm phone-mount ball (phone-mount-ball-17mm) are different balls. No file: no socket or eyelet profile is given as numbers in the sources read. McMaster-Carr sells end fittings with per-part STEP; linked, not copied." ], "table": { "columns": [ "source", "thread", "material", "ball Ø", "thread length", "spanner width", "part / designation" ], "rows": [ [ "McMaster-Carr eyelet end fitting", "M3.5 × 0.6", "zinc-plated steel", "—", "—", "—", "9416K421" ], [ "McMaster-Carr eyelet end fitting", "M3.5 × 0.6", "316 stainless steel", "—", "—", "—", "9424K18" ], [ "McMaster-Carr eyelet end fitting", "M5 × 0.8", "303 stainless steel", "—", "—", "—", "9424K19" ], [ "McMaster-Carr eyelet end fitting", "M6 × 1", "zinc alloy", "—", "—", "—", "9416K422, 9416K423, 9416K84, 6465K61, 6465K112" ], [ "McMaster-Carr eyelet end fitting", "M6 × 1", "316 stainless steel", "—", "—", "—", "9424K14" ], [ "McMaster-Carr eyelet end fitting", "M6 × 1", "nylon (nonsparking)", "—", "—", "—", "6465K26" ], [ "McMaster-Carr eyelet end fitting", "M8 × 1.25", "zinc alloy", "—", "—", "—", "9416K88, 6465K63, 6465K27" ], [ "McMaster-Carr eyelet end fitting", "M8 × 1.25", "zinc-plated steel", "—", "—", "—", "9416K424" ], [ "McMaster-Carr eyelet end fitting", "M8 × 1.25", "316 stainless steel", "—", "—", "—", "9424K15" ], [ "McMaster-Carr eyelet end fitting", "M8 × 1.25", "aluminum (lightweight)", "—", "—", "—", "9428K3" ], [ "McMaster-Carr eyelet end fitting", "M10 × 1.5", "zinc-plated steel", "—", "—", "—", "9416K425" ], [ "McMaster-Carr eyelet end fitting", "M10 × 1.5", "316 stainless steel", "—", "—", "—", "9424K16, 9424K911" ], [ "McMaster-Carr eyelet end fitting", "M10 × 1.5", "aluminum (lightweight)", "—", "—", "—", "9416K666" ], [ "McMaster-Carr eyelet end fitting", "M14 × 1.5", "zinc-plated steel", "—", "—", "—", "6465K111" ], [ "Lesjöfors ball stud", "M4", "steel", "ball Ø8 mm", "thread length l2 9 mm", "SW 7 mm", "BS1 (604)" ], [ "Lesjöfors ball stud", "M6", "steel", "ball Ø10 mm", "thread length l2 11 mm", "SW 8 mm", "BS2 (4616)" ], [ "Lesjöfors ball stud", "M8", "steel", "ball Ø10 mm", "thread length l2 12 mm", "SW 13 mm", "BS3 (4610)" ], [ "Lesjöfors ball stud", "M8", "AISI 303 stainless", "ball Ø10 mm", "thread length l2 12 mm", "SW 13 mm", "BS6 (S1139)" ], [ "Lesjöfors ball stud", "M10", "steel", "ball Ø13 mm", "thread length l2 20 mm", "SW 17 mm", "BS5 (8272)" ], [ "Lesjöfors ball stud", "M8", "steel", "ball Ø13 mm", "thread length l2 16.5 mm", "SW 11 mm", "BS7 (62600)" ], [ "nb-parts end fittings by thread (as listed)", "M5", "see list", "—", "—", "—", "WG S 10x19 (M5/M6, M5/M8), KP 10x19-M5, KUZA 10-M6x12 / M8x13, fork G5x10-M5, eyelet 6.1-6x16-M5" ], [ "nb-parts end fittings by thread (as listed)", "M6", "see list", "—", "—", "—", "WG CS 10 (x19 or x25; M6/M6, M6/M8), KP B 10 (x19 or x25), WG S 10, KP 10, PKP 10 (plastic socket), KUZA 10, fork G 6x12-M6, eyelets 8.1 mm" ], [ "nb-parts end fittings by thread (as listed)", "M8", "see list", "—", "—", "—", "WG CS 13 (x20 / x25 / x30), KP B 13, WG S 10 (M8/M6, M8/M8), KP 10x19-M8, KUZA 10 / 13, fork G 8x16-M8, eyelets 8.1 / 10.1, spacers M8x34 / M8x58" ], [ "nb-parts end fittings by thread (as listed)", "M10", "see list", "—", "—", "—", "WG CS 16 (x30 / x35), KP B 16x30, forks G 10x20, G 10x40 and G 8x16, eyelets 8.1 / 10.1 / 12.1, spacers M10x22 / M10x50" ], [ "nb-parts end fittings by thread (as listed)", "M14", "see list", "—", "—", "—", "WG CS 19x45 (M14x1.5 / M14), fork G 14x28, eyelet 14.1-14x40" ] ] } }, "sheet_text": "Gas spring end fittings: eyelet and fitting threads M3.5–M14, ball studs Ø8 / Ø10 / Ø13 (M4–M10), ball sockets and forks — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/gas-spring-end-fittings/ (sheet CC BY 4.0)\nBasis: McMaster-Carr's eyelet end-fitting thread table, Lesjöfors' ball stud list (ball diameter, thread, thread length, spanner width), and nb-parts' end-fitting list by thread; numbers only\nCatalog version: 2026-10-20\n\nSizes: see table below\n- McMaster-Carr eyelet fittings screw onto the gas spring end thread: M3.5 × 0.6, M5 × 0.8, M6 × 1, M8 × 1.25, M10 × 1.5 and M14 × 1.5 (mm) in zinc alloy, zinc-plated steel, 303 / 316 stainless, aluminum or nylon, with the part numbers shown. The page tells the buyer to match the fitting's thread to the spring's rod and end thread, and each fitting adds its own length to the extended and compressed lengths (see gas-springs-series-and-strokes).\n- Lesjöfors ball studs (d1 = ball diameter, thread, thread length l2, spanner width SW, in mm): BS1 Ø8 M4, BS2 Ø10 M6, BS3 and BS6 Ø10 M8 (steel and AISI 303), BS5 Ø13 M10 and BS7 Ø13 M8, as read from the page. So the common '10 mm ball' stud comes with an M6 or M8 thread; the 13 mm ball with M8 or M10.\n- Ball sockets: a Stabilus catalogue caption names 'ball studs according to DIN 71803 Ø10' as the mating stud for its ball-socket brackets, and McMaster's fitting assortments list ball sockets for 10 mm, 13 mm and 16 mm balls; no socket dimension table was readable, so socket depth and snap force are not given. A machine reading of McMaster's fitting-assortment table mixed the socket's thread with the stud's (a 5/16-18 stud thread appeared next to metric sockets); those stud threads are not used.\n- nb-parts' list is by gas-spring end thread (M5 to M14): the catalogue names ball sockets (WG, KP), eyelets, forks (G), plastic sockets (PKP) and spacers with the sizes in each designation. The designations are the maker's; read the maker's table for the dimensions.\n- Related: RAM-style ball sizes (ram-mount-ball-sizes) and the 17 mm phone-mount ball (phone-mount-ball-17mm) are different balls. No file: no socket or eyelet profile is given as numbers in the sources read. McMaster-Carr sells end fittings with per-part STEP; linked, not copied.\n\nsource thread material ball Ø thread length spanner width part / designation\nMcMaster-Carr eyelet end fitting M3.5 × 0.6 zinc-plated steel — — — 9416K421\nMcMaster-Carr eyelet end fitting M3.5 × 0.6 316 stainless steel — — — 9424K18\nMcMaster-Carr eyelet end fitting M5 × 0.8 303 stainless steel — — — 9424K19\nMcMaster-Carr eyelet end fitting M6 × 1 zinc alloy — — — 9416K422, 9416K423, 9416K84, 6465K61, 6465K112\nMcMaster-Carr eyelet end fitting M6 × 1 316 stainless steel — — — 9424K14\nMcMaster-Carr eyelet end fitting M6 × 1 nylon (nonsparking) — — — 6465K26\nMcMaster-Carr eyelet end fitting M8 × 1.25 zinc alloy — — — 9416K88, 6465K63, 6465K27\nMcMaster-Carr eyelet end fitting M8 × 1.25 zinc-plated steel — — — 9416K424\nMcMaster-Carr eyelet end fitting M8 × 1.25 316 stainless steel — — — 9424K15\nMcMaster-Carr eyelet end fitting M8 × 1.25 aluminum (lightweight) — — — 9428K3\nMcMaster-Carr eyelet end fitting M10 × 1.5 zinc-plated steel — — — 9416K425\nMcMaster-Carr eyelet end fitting M10 × 1.5 316 stainless steel — — — 9424K16, 9424K911\nMcMaster-Carr eyelet end fitting M10 × 1.5 aluminum (lightweight) — — — 9416K666\nMcMaster-Carr eyelet end fitting M14 × 1.5 zinc-plated steel — — — 6465K111\nLesjöfors ball stud M4 steel ball Ø8 mm thread length l2 9 mm SW 7 mm BS1 (604)\nLesjöfors ball stud M6 steel ball Ø10 mm thread length l2 11 mm SW 8 mm BS2 (4616)\nLesjöfors ball stud M8 steel ball Ø10 mm thread length l2 12 mm SW 13 mm BS3 (4610)\nLesjöfors ball stud M8 AISI 303 stainless ball Ø10 mm thread length l2 12 mm SW 13 mm BS6 (S1139)\nLesjöfors ball stud M10 steel ball Ø13 mm thread length l2 20 mm SW 17 mm BS5 (8272)\nLesjöfors ball stud M8 steel ball Ø13 mm thread length l2 16.5 mm SW 11 mm BS7 (62600)\nnb-parts end fittings by thread (as listed) M5 see list — — — WG S 10x19 (M5/M6, M5/M8), KP 10x19-M5, KUZA 10-M6x12 / M8x13, fork G5x10-M5, eyelet 6.1-6x16-M5\nnb-parts end fittings by thread (as listed) M6 see list — — — WG CS 10 (x19 or x25; M6/M6, M6/M8), KP B 10 (x19 or x25), WG S 10, KP 10, PKP 10 (plastic socket), KUZA 10, fork G 6x12-M6, eyelets 8.1 mm\nnb-parts end fittings by thread (as listed) M8 see list — — — WG CS 13 (x20 / x25 / x30), KP B 13, WG S 10 (M8/M6, M8/M8), KP 10x19-M8, KUZA 10 / 13, fork G 8x16-M8, eyelets 8.1 / 10.1, spacers M8x34 / M8x58\nnb-parts end fittings by thread (as listed) M10 see list — — — WG CS 16 (x30 / x35), KP B 16x30, forks G 10x20, G 10x40 and G 8x16, eyelets 8.1 / 10.1 / 12.1, spacers M10x22 / M10x50\nnb-parts end fittings by thread (as listed) M14 see list — — — WG CS 19x45 (M14x1.5 / M14), fork G 14x28, eyelet 14.1-14x40\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- McMaster-Carr: Gas springs, McMaster-Carr 'About gas springs' (eyelet series, adjustable-force stainless series, end fittings) (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/gas-spring-fitting-eyelets\n- Lesjofors: Gas spring ball studs: BS1 (Ø8, M4), BS2 (Ø10, M6), BS3 / BS6 (Ø10, M8), BS5 (Ø13, M10), BS7 (Ø13, M8): thread length l2, spanner width SW — web — Maker product page; numbers only — https://shop.lesjofors.com/de/en-US/all-products/gas-springs/end-fittings-and-accessories/end-fittings/ball-studs-p-1022/\n- nb-parts: Gas springs catalogue: Ø pairs, end thread, stroke ranges and end fittings (M3.5 to M24, ball sockets, eyelets, forks) — web — Maker catalogue; numbers only. The source text does not label which Ø of a pair is the rod — https://www.nb-parts.de/pdf/catalogues/nb-parts_gas-springs_en.pdf\n- McMaster-Carr: Mechanical struts and gas springs (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/mechanical-struts/\n- Stabilus (catalogue host page): Standard-program catalogue captions: ball-socket brackets 'suitable for ball studs according to DIN 71803 Ø10' — web — Not used for numbers; see notes — https://pdf.directindustry.com/pdf/stabilus/standard-program-gas-springs/7206-412283.html\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=gas-spring-end-fittings\n", "sources": [ { "publisher": "McMaster-Carr", "title": "Gas springs, McMaster-Carr 'About gas springs' (eyelet series, adjustable-force stainless series, end fittings) (free STEP/IGES per part, for your own design use; no redistribution)", "url": "https://www.mcmaster.com/gas-spring-fitting-eyelets", "formats": [ "STEP", "IGES", "PDF" ], "license": "McMaster-Carr site terms: personal design use, no redistribution", "license_verified": false, "hosted": false }, { "publisher": "Lesjofors", "title": "Gas spring ball studs: BS1 (Ø8, M4), BS2 (Ø10, M6), BS3 / BS6 (Ø10, M8), BS5 (Ø13, M10), BS7 (Ø13, M8): thread length l2, spanner width SW", "url": "https://shop.lesjofors.com/de/en-US/all-products/gas-springs/end-fittings-and-accessories/end-fittings/ball-studs-p-1022/", "formats": [ "web" ], "license": "Maker product page; numbers only", "license_verified": true, "hosted": false }, { "publisher": "nb-parts", "title": "Gas springs catalogue: Ø pairs, end thread, stroke ranges and end fittings (M3.5 to M24, ball sockets, eyelets, forks)", "url": "https://www.nb-parts.de/pdf/catalogues/nb-parts_gas-springs_en.pdf", "formats": [ "web" ], "license": "Maker catalogue; numbers only. The source text does not label which Ø of a pair is the rod", "license_verified": true, "hosted": false }, { "publisher": "McMaster-Carr", "title": "Mechanical struts and gas springs (free STEP/IGES per part, for your own design use; no redistribution)", "url": "https://www.mcmaster.com/products/mechanical-struts/", "formats": [ "STEP", "IGES", "PDF" ], "license": "McMaster-Carr site terms: personal design use, no redistribution", "license_verified": false, "hosted": false }, { "publisher": "Stabilus (catalogue host page)", "title": "Standard-program catalogue captions: ball-socket brackets 'suitable for ball studs according to DIN 71803 Ø10'", "url": "https://pdf.directindustry.com/pdf/stabilus/standard-program-gas-springs/7206-412283.html", "formats": [ "web" ], "license": "Not used for numbers; see notes", "license_verified": true, "hosted": false } ], "xem": { "status": "not-scanned", "sheet_free": true, "mesh_price_usd": null, "step_price_usd": null, "tolerance_mm": null }, "related": [ "gas-springs-series-and-strokes", "ram-mount-ball-sizes", "phone-mount-ball-17mm", "clevis-pins", "compression-springs" ], "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": "end-fitting thread", "exact": "M3.5 x 0.6, M5 x 0.8, M6 x 1, M8 x 1.25, M10 x 1.5, M14 x 1.5 (McMaster-Carr eyelet fittings)", "mates": "rod or tube end thread of the gas spring with the same thread (SUSPA 16-3 prints M6 x 1.0 rod end and M8 x 1.0 tube end)", "fit": "designed", "files": "all" }, { "feature": "ball stud Ø10", "exact": "Ø10 ball on an M6 (thread 11 mm, SW 8) or M8 (thread 12 mm, SW 13) stud (Lesjofors BS2, BS3 / BS6)", "mates": "Ø10 ball socket on the gas spring end fitting ('ball studs according to DIN 71803 Ø10', Stabilus caption)", "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 thread does a 10 mm ball stud have?", "a": "Lesjöfors lists the Ø10 ball stud with an M6 thread (11 mm thread length, SW 8) and with an M8 thread (12 mm, SW 13); the Ø8 ball has M4 and the Ø13 ball M8 or M10." }, { "q": "What are the threads of gas spring eyelet fittings?", "a": "M3.5 × 0.6, M5 × 0.8, M6 × 1, M8 × 1.25, M10 × 1.5 and M14 × 1.5 mm on McMaster-Carr's page." }, { "q": "Which DIN covers the 10 mm gas spring ball?", "a": "A Stabilus catalogue caption says 'ball studs according to DIN 71803 Ø10'; the DIN sheet itself was not read." } ], "files_license": null, "offers": [], "markdown": "https://xemstudio.com/objects/gas-spring-end-fittings/index.md" }