ISO INTERNATIONAL 8748 STANDARD Third edition 2007-04-15 Spring-type straight pins Coiled, heavy duty Goupilles élastiques spiralées-Série épaisse Reference number ISO 8748:2007(E) ii Foreword IsO (the International Organization for Standardization) is a worldwide federation of national standards bodies International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/lEC Directives, Part 2 adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75%of thememberbodies casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. IsO shall not be held responsible for identifying any or all such patent rights. ISO 8748 was prepared by Technical Committee ISO/TC 2,Fasteners,Subcommittee SC10,Product standardsforfasteners. This third edition cancels and replaces the second edition (ISO 8748:1997), which has been technically revised. blank Spring-type straight pins Coiled, heavy duty Scope This International Standard specifies the characteristics of coiled heavy duty spring-type straight pins made of steel or of austenitic or martensitic stainless steel, with a nominal diameter, dg, from 1,5 mm to 20 mm inclusive. NOTE Spring-type straight pins, coiled, standard duty, and spring-type straight pins, coiled, light duty, are the subjectsofISO8750andISO8751,respectively. 2Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments)applies. ISO286-2,Iso system of limits and fits-Part2:Tables of standard tolerancegrades and limit deviations for holesandshafts IsO3269,Fasteners—Acceptanceinspection Iso 4042,Fasteners-Electroplated coatings IsO8749,PinsandgroovedpinsSheartest 3 Dimensions See Figure 1 and Table 1. Swaged chamfer at both ends. Figure 1 Table 1-Dimensions Dimensions in millimetres 2,5 3,5 6 1,5 2 10 12 14 16 20 nom. 4 8 before max. 1,71 2,21 2,73 3,25 3,79 4,30 5,35 6,40 8,55 10,65 12,75 14,85 16,9 21,0 d, 2,62 3,64 20,4 Gununo min. 1,61 2,11 3,12 4,15 5,15 6,18 8,25 10,30 12,35 14,40 16,4 before 2,9 3,9 d2 max. 1,4 1,9 2,4 3,4 4,85 5,85 7,8 9,75 11,7 13,6 15,6 19,6 mounting a 0,5 0,7 0,7 0,9 1 1,1 1,3 1,5 2 2,5 3,5 4 4,5 0,17 0,22 0,28 0,33 0,39 0,45 0,56 0,67 0,9 1,1 1,3 1,6 1,8 2,2 Minimumshear 1,9 3,5 5,5 7,6 10 13,5 20 30 53 e 84 120 165 210 340 strength, 2,5 3,8 5,7 7,6 1,45 10 15,5 23 41 64 91 double, kN 1c nom. min. max. 4 3,75 4,25 5 4,75 5,25 6 5,75 6,25 8 7,75 8,25 10 9,75 10,25 12 11,5 12,5 14 13,5 14,5 15,5 16,5 16 18 17,5 18,5 20 19,5 20,5 22 21,5 22,5 24 23,5 24,5 26 25,5 26,5 28 27,5 28,5 Range 30 29,5 30,5 32 31,5 32,5 35 34,5 35,5 Jo 39,5 40,5 40 45 44,5 45,5 50 49,5 50,5 commercial 55 54,25 55,75 60 59,25 60,75 65 64,25 65,75 lengths 70 69,25 70,75 75 74,25 75,75 80,75 80 79,25 85 84,25 85,75 90 89,25 90,75 95 94,25 95,75 100 99,25 100,75 120 119,25 120,75 140 139,25 140,75 160 159,25 160,75 179,25 180,75 180 200 199,25 200,75 a Applies to steel and martensitic corrosion-resistant steel products. b Applies to austenitic stainless steel products. For nominal lengths above 200 mm, steps of 20 mm. 2 4 Application of the mating pin and to tolerance class H12, in accordance with ISO 286-2. 5 RequirementsandreferenceInternationalStandards See Table2. Table2RequirementsandreferenceInternationalStandards Austenitic Martensitic Steel stainless steel stainless steel St A Alternative for pin Chemical composition limits All pin diameters diameters d, >12 mm (chemical analysis) % Chemical compositions limits (chemical analysis) % C ≥ 0,64 C ≥0,38 C≤0,15 C ≥ 0,15 Mn ≥ 0,60 Mn ≥ 0,70 Mn ≤2.00 Mn ≤ 1,00 Si ≥0,15 Si ≥ 0,20 Si ≤ 1,50 Si≤ 1,00