1、FORD WORLDWIDE FASTENER STANDARDDate: 1993-01-01Engineering Standards & 1 of 2 Printed copies are uncontrolled .Systems Engineering (ESSE)WH 901General Requirements and Physical Properties for Spring Pins - Coiled1. SCOPE. This standard specifies the material, heat treatment, gauging and physical pr
2、operties for metriccoiled spring pins intended for general use.1.1 REFERENCES.ISO 6507: 1982 - Metallic materials - Hardness test- Vickers test.ISO 6508 - Metallic materials - Hardness test - Rockwell test.WSD-M1A283-B50/B51/B52 - Steel, cross reference for standard parts.2. GENERAL REQUIREMENTS.2.1
3、 DIAMETER. The pin diameters shall be inspected using the Go/No Go ring gauges shown inTable 1.Table 1.Dimensions in mmPin Size 2 3 4 5 6 8 10Go 2.25 3.3 4.4 5.5 6.5 8.63 10.8Gage 2.24 3.29 4.39 5.49 6.49 8.62 10.79No Go 2.14 3.16 4.21 5.21 6.26 8.31 10.36Gauge 2.13 3.15 4.2 5.2 6.25 8.30 10.352.2 S
4、TRAIGHTNESS. The straightness of the pins shall be within the limits necessary to permit thepins to fall through a ring gauge by their own weight. Ring gauge dimensions are shown in Table2.Table 2.Dimensions in mmPin Length GaugeLengthGauge HoleDiameter *+/- 0.15 Max. Min.To & including 24 25 0.2 0.
5、18Over 24 to 50 50 0.34 0.3Over 50 75 0.48 0.42* Gauge hole diameter = Max pin diameter plus indicated values3. MATERIAL AND HEAT TREATMENT.3.1 MATE RIAL. Steel - WSD-M1A283-B50/51/52.3.2 HEAT TREATMENT. The pins are to be through hardened and tempered to HV 420-545(HR 15N82-86.4) or austempered to
6、HV 500-580 (HR 15N85-87.5).4. PHYSICAL PROPERTIES.4.1 HARDNESS TESTING. The hardness testing shall be performed in accordance with the followingprocedures:Vickers Hardness to ISO 6507:1982 10kg load.Rockwell Hardness to ISO 6508.NOTE: In case of dispute the Vickers Hardness test is decisive for acce
7、ptance.FORD WORLDWIDE FASTENER STANDARDDate: 1993-01-01Engineering Standards & 2 of 2 Printed copies are uncontrolled .Systems Engineering (ESSE)WH 901General Requirements and Physical Properties for Spring Pins - Coiled4.2 PERFORMANCE. Pins shall be capable of withstanding the double shear loads sp
8、ecified in Table3. The shear test shall be performed in a fixture in which the pin support member and the memberfor applying the load shall have holes with diameters as recommended for the pins and shall have ahardness of HV 700 minimum. The clearance between the supporting members and the loadmembe
9、r shall not exceed 0.15mm and the shear plane shall be at least one pin diameter away fromeach end and at least two diameters apart. Pins too short to be tested in double shear shall be testedby shearing two pins simultaneously in single shear. Speed of testing shall not exceed13mm/minute. Pins shal
10、l be tested to failure. The maximum load applied to the pin coincidentwith or prior to pin failure shall be recorded as the double shear strength of the pin. Pins tested forshear strength shall shown a ductile shear without longitudinal cracks.Table 3.Dimensions in mmNominal Pin Size 2 3 4 5 6 8 10M
11、in. Double Shear Strength -kN2.5 5.5 9.6 15 22 39 625. DEFECTS. Pins shall be free from burrs, loose scale, seams, notches, sharp edges and corners and anyother defects affecting serviceability.6. RECOMMENDED APPLICATION HOLE SIZES. See Table 4.Table 4.Dimensions in mmNominal Pin Size 2 3 4 5 6 8 10Hole Dia. max. 2.1 3.1 4.12 5.12 6.12 8.15 10.15min. 2 3 4 5 6 8 10
