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1、INTERNATIONAL STANDARD IS0 8748 Second edition 1997-11-15 Spring-type straight pins - Coiled, heavy duty Goupilles dastiques spiral a=400net; p=iso; o=isocs; s=central Printed in Switzerland ii Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=N
2、ASA Technical Standards 1/9972545001 Not for Resale, 04/25/2007 23:54:16 MDTNo reproduction or networking permitted without license from IHS -,-,- INTERNATIONAL STANDARD IS0 IS0 8748: 1997(E) Spring-type straight pins - Coiled, heavy duty 1 Scope This International Standard specifies the characteris
3、tics of heavy duty coiled spring-type straight pins made of steel or of austenitic or mattensitic stainless steel, with nominal diameter, d, from I,5 mm to 20 mm inclusive. NOTE - Spring-type straight pins, coiled, standard duty and spring type straight pins, coiled, light duty, are the subjects of
4、IS0 8750 and IS0 8751 respectively. 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and
5、 parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. Members of IEC and IS0 maintain registers of currently valid International Standards. IS0 3269: 1988, Fasteners -Acceptance
6、 inspection. IS0 4042:- ), Fasteners - Elecrroplared coatings. IS0 8749:1986, Pins and grooved pins - Shear rest 3 Dimensions See figure 1 and table 1. I) Swaged chamfer at both ends Figure 1 1) To be published. (Revision of IS0 4042:1989) Copyright International Organization for Standardization Pro
7、vided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/25/2007 23:54:16 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 8748: 1997(E) Table 1 - Dimensions Dimensions in millimetres 24 23.5 24.5 26 25.5 26.5 28 27.5 28.5 30
8、29.5 30,5 32 31,5 32,5 35 34,5 35,5 40 39,5 40,5 45 44,5 45.5 50 49.5 50,5 55 54.25 55.75 60 59,25 60.75 65 64.25 65,75 70 69.26 70.75 75 80 65 $ 90 95 100 120 140 160 I 74.25 75.75 79,25 80.75 64,25 85,75 89.25 go,75 t 94,25 95.75 99,25 100.75 I 19,25 120,75 139.25 140,75 159.25 160.75 x I) Applies
9、 to steel and martensitic corrosion resistant steel products. !) Applies to austenitic stainless steel products. Range of commercial I I I lengths I) For nominal lengths above 200 mm, steps of 20 mm. Copyright International Organization for Standardization Provided by IHS under license with ISO Lice
10、nsee=NASA Technical Standards 1/9972545001 Not for Resale, 04/25/2007 23:54:16 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 8748:1997(E) 0 IS0 4 Application The diameter of the hole into which the spring pin is to be inserted shall be equal to the nominal diameter d,
11、 of the mating pin and to tolerance class H12. 5 Requirements and reference International Standards See table 2. Table 2 - Requirements and reference International Standards Steel Austenitic Martensitic stainless steel stainless steel St A C All pin diameters Alternative for pin Chemical composition
12、s limits diameters d, 12 mm (check analysis) % Chemical compositions limits (check analysis) % Material” c 2 064 Mna 0,60 Si 2 0,15 Cr” P G 0,04 s c 0,05 C z= 0.38 Mn 0,70 si z= 0,20 Cr 2 0,80 v a O,l5 P G 0,035 s =s 0,04 C s 0,15 MnG 2,00 Si s I,50 Cr 16 to 20 Ni 6to 12 P c 0,045 s c 0,03 MOG 0,8 c
13、 23 0,15 Mn=z I,00 Si 1,00 Cr 11,5to 14 Ni G 1.00 P =s 0,04 s = 0,03 Hardened and tempered to a Vickers hardness of 420 HV30 to 545 HV30 Cold worked Hardened and tempered to a Vickers hardness of 460 HV30 to 560 HV30 Plain, i.e. pins to be supplied in natural finish, treated with a protective lubric
14、ant, unless otherwise specified by agreement between customer and supplier. If pins are surface coated appropriate plating or coating processes should be employed to avoid hydrogen embrittle- ment. When pins are electroplated or Surface finish phosphate-coated, they shall be suitably Plain, i.e. pin
15、s to be supplied in natural treated immediately after plating or finish. coating to obviate detrimental hydrogen embrittlement although freedom from hy- drogen embrittlement is not absolutely guaranteed (see IS0 4042). All tolerances shall apply prior to the application of a plating or coating. Pins
16、 shall be free of irregularities or detrimental defects. Workmanship No burrs shall appear on any part of the pin. Shear strength test The test shall be in accordance with IS0 8749. Acceptability The acceptance procedure is covered in IS0 3269. 1) Other materials as agreed between customer and suppl
17、ier. 2) Use of Cr is optional. 3 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/25/2007 23:54:16 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 8748: 1997
18、(E) IS0 6 Designation EXAMPLE 1 A steel spring-type straight pin, coiled, heavy duty, with nominal diameter d, = 6 mm and nominal length 1 = 30 mm is designated as follows: Spring pin IS0 8748 - 6 x 30 - St EXAMPLE 2 An austenitic stainless steel spring-type straight pin (A), coiled, heavy duty, wit
19、h nominal diameter d, = 6 mm and nominal length I= 30 mm is designated as follows: Spring pin IS0 8748 - 6 x 30 - A Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/25/2007 23:54:16 MDTNo
20、 reproduction or networking permitted without license from IHS -,-,- IS0 Annex A (informative) Bibliography I I IS0 8750:1997, Spring-type straight pins - Coiled, standard duty. 21 IS0 8751:1997, Spring-type straight pins - Coiled, light duty. IS0 8748:1997(E) Copyright International Organization fo
21、r Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/25/2007 23:54:16 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 8748:1997(E) IS0 ICS 21.060.50 Descriptors: fasteners, steel products, pins (mecha
22、nics), straight pins, spring pins, specifications, characteristics, dimensions, designation, heavy duty series. Price based on 5 pages Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/25/2007 23:54:16 MDTNo reproduction or networking permitted without license from IHS -,-,-