Gas spring end fittings: eyelet and fitting threads M3.5–M14, ball studs Ø8 / Ø10 / Ø13 (M4–M10), ball sockets and forks — dimension sheet Source: Xem Studio, https://xemstudio.com/objects/gas-spring-end-fittings/ (sheet CC BY 4.0) 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 Catalog version: 2026-10-20 Sizes: see table below - 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. source thread material ball Ø thread length spanner width part / designation 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 Files elsewhere (not hosted by Xem Studio; license as stated by the publisher): - 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 - 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/ - 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 - 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/ - 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 No true-size file yet: the published figures do not fix the whole shape; a measured scan is planned. API: https://xemstudio.com/api/geometry?object=gas-spring-end-fittings