Grooved pins ISO 8739–8747 (groove pins): types, nominal diameter 1.5–25, a, chamfer c, expanded diameter, double shear, hole class — dimension sheet Source: Xem Studio, https://xemstudio.com/objects/grooved-pins-iso-8739-8747/ (sheet CC BY 4.0) Basis: fasten.it's ISO 8740 table (d, expanded diameter, c1, c2, a), iTeh's ISO 8739:1997 sample pages (a, double shear, hole class H11; its numbers agree with fasten.it's where both print them), GB/T 13829.2 as a cross-check of the shear values, ISO's own list of titles; numbers only Catalog version: 2026-10-20 Sizes: see table below - Grooved pins (groove pins) have three grooves along the pin, pressed so the displaced metal grips the hole. ISO's titles (ICS 21.060.50 list; all 1986 and 1997 editions are marked withdrawn there, with 2025 editions of ISO 8740 and ISO 8741 on iTeh): ISO 8739 - Full-length parallel grooved, with pilot; ISO 8740 - Full-length parallel grooved, with chamfer; ISO 8741 - Half-length reverse-taper grooved; ISO 8742 - One-third-length centre grooved (1986 title: third-length centre grooved); ISO 8743 - Half-length centre grooved; ISO 8744 - Full-length taper grooved; ISO 8745 - Half-length taper grooved; ISO 8746 - Grooved pins with round head; ISO 8747 - Grooved pins with countersunk head. The groove form is the difference between the types: parallel or taper grooves, full, half or one-third length, centre or end. - Table columns (mm unless noted): d nominal, the expanded diameter fasten.it prints under the header 'd1 expanded diameter for all lengths', c1, c2 and a ('approx.' in iTeh's ISO 8739 sample), and the minimum double-shear force in kN. fasten.it's table is for ISO 8740 (full-length parallel grooved, with chamfer), d 1.5 to 25 mm; its c1 and c2 are not defined in the text (the drawing is an image). a approx. in iTeh's ISO 8739 sample agrees with fasten.it's a for all 13 sizes; the double-shear values in iTeh's ISO 8739 sample are the same list as GB/T 13829.2's (Global Fastener) for the half-length reverse-taper type, so they are shown once; whether the standards share these shear values by type was not verified beyond those two. ISO 8739's c max / min (2 to 7 and 1 to 6 mm) are a different quantity and not tabulated. - Hole: the mating hole diameter equals the nominal pin diameter d, tolerance class H11 (clause 4 of ISO 8739:1997, iTeh OCR). The 2025 text of ISO 8740 and ISO 8741 says hole dimensions and the expanded diameter d2 are in ISO 13669 and that the angle between two grooves is 120° ±20° with the 70° groove angle a reference (iTeh's 2025 samples; the tables are not in the samples). Steel pins are 125 to 245 HV30 and A1 stainless 210 to 280 HV30 (ISO 8739 sample). The expanded-diameter table in the ISO 8739 sample is keyed by pin length and its column alignment did not survive the text extraction, so it is not tabulated; its values (2.15, 2.65, 3.2, 4.25, 5.25, 6.3, 8.3, 10.35, 12.35, 16.4, 20.5, 25.5) are the same list as fasten.it's expanded diameters. - Not read or not shown: the 2025 table values of ISO 8740 to 8745, the length range per diameter (the matrix was lost in the extraction), and the DIN 1471 to 1476 and ASME B18.8.2 grooved-pin tables (opac.net's DIN 1470 sheet prints a and c per d with a slightly different 5 mm value, c 0.6 against 0.63 here, so those sheets are not mixed in). No file: the groove form and the expanded profile are not published as numbers in the sources read. ISO 8741's 2025 text says its pins have rounded ends by default and chamfered ends by agreement. d nominal (mm) expanded diameter, fasten.it 'd1' (mm) c1 (mm) c2 (mm) a approx. (mm) min double shear (kN) hole (mm) 1.5 1.6 0.12 0.6 0.2 1.6 1.5 (H11) 2 2.15 0.18 0.8 0.25 2.84 2 (H11) 2.5 2.65 0.25 1 0.3 4.4 2.5 (H11) 3 3.2 0.3 1.2 0.4 6.4 3 (H11) 4 4.25 0.4 1.4 0.5 11.3 4 (H11) 5 5.25 0.5 1.7 0.63 17.6 5 (H11) 6 6.3 0.6 2.1 0.8 25.4 6 (H11) 8 8.3 0.8 2.6 1 45.2 8 (H11) 10 10.35 1 3 1.2 70.4 10 (H11) 12 12.35 1.2 3.8 1.6 101.8 12 (H11) 16 16.4 1.6 4.6 2 181 16 (H11) 20 20.5 2 6 2.5 283 20 (H11) 25 25.5 2.5 7.5 3 444 25 (H11) Files elsewhere (not hosted by Xem Studio; license as stated by the publisher): - fasten.it: DIN EN ISO 8740 grooved pins, full-length parallel grooved, with chamfer, d 1.5 to 25: d, expanded diameter, c1, c2, a (table; the drawing is an image) — web — Reference page; numbers only — https://fasten.it/norms/norm/din_en_iso_8740 - iTeh Standards: ISO 8739:1997 sample pages: c max / min, a approx., minimum double-shear force, expanded diameter table, hole class H11, hardness (OCR; column alignment flagged) — web — Standards-body sample pages; numbers only — https://cdn.standards.iteh.ai/samples/20003/6b7047cee06347469a07d58056a002b2/ISO-8739-1997.pdf - iTeh Standards: ISO 8741:2025 sample pages (scope, groove angle 70° ref., grooves 120° ±20°, rounded ends); the tables are not in the sample — web — Standards-body sample pages; text only — https://cdn.standards.iteh.ai/samples/84096/6a46854e51c445128687918bac325164/ISO-8741-2025.pdf - Global Fastener: GB/T 13829.2-1992 grooved pins, half-length reverse-taper grooved: d1 max / min, c approx., minimum double shear, nominal lengths 8 to 200 (the Chinese standard of the ISO 8741 type; cross-check) — web — Reference page; numbers only — https://www.globalfastener.com/standards/detail_2380.html - ISO: ICS 21.060.50 (pins, nails and similar): exact titles of ISO 8739 to 8747, 1234, 2338 to 2341, 8733 to 8735, 8750, 8752, 13337 — web — Standard body catalogue page — https://www.iso.org/ics/21.060.50.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=grooved-pins-iso-8739-8747