1、 WORLDWIDE FASTENER STANDARD2005-02-01Printed copies are uncontrolled Copyright 2005, Ford Global Technologies, LLC. Page 1 of 2 WA 950 Material Requirements and Mechanical Properties of Bolts, Studs, and Bolt & Washer Assemblies. 1. SCOPE. This standard specifies the design information relating to
2、material requirements and mechanical properties for bolts, studs, and bolt & washer assemblies when tested at room temperature (ISO 1). NOTE: All requirements of ISO 898/1 apply unless otherwise specified in this standard. 2. REFERENCES. ISO 1 Standard reference temperature for industrial length mea
3、surements. ISO 898/1 Mechanical properties of fasteners - Part 1: Bolts, screws and studs. SAE/USCAR-8 Grain Flow Pattern for Bolts and Screws. WA 990 Surface discontinuities of bolts and studs. WF 900 Dimensional, material, heat treatment, hardness and performance requirements for flat, toothed, co
4、nical, bowed and wavy washers. 3. MECHANICAL PROPERTIES. Bolts, studs, and bolt & washer assemblies shall have the mechanical properties as specified in ISO 898 Part 1. Bolt & washer assemblies shall be tested in the assembled washer form wherever possible. Where the conditions of a given test so di
5、ctate, the washer component may require removal. 4. MINIMUM ULTIMATE TENSILE LOADS AND PROOF LOADS. The minimum tensile loads and proof load tables in the standard have been provided to assist Design Engineers. The tables show property classes 4.8, 8.8 and 10.9, and are the only property classes per
6、mitted for through hardened Ford worldwide fasteners. Property class 10.9 (10.9 underlined) fasteners are unacceptable. Property class 10.9 fasteners specify a minimum tempering temperature of 340C and a 0.15-0.35% carbon content. For information regarding property classes and thread diameters not i
7、ncluded in Table 1, refer to ISO 898 Part 1. 5. SURFACE INTEGRITY. For referee purposes, surface integrity shall be in accordance with WA 990. 6. MATERIAL, HEAT TREATMENT, HARDNESS AND PERFORMANCE REQUIREMENTS FOR THE WASHER COMPONENT OF BOLT & WASHER ASSEMBLIES. The material, heat treatment, hardne
8、ss and performance requirements of the washer component of bolt & washer assemblies shall be in accordance with WF 900. 7. GRAIN FLOW. Grain flow shall be verified in accordance with SAE/USCAR-8. This verification should be conducted at job setup, or whenever tooling or raw material changes are made
9、 that affect grain flow. The sample size and frequency should be identified in the manufacturers Control Plan. All records, test specimens or photographs for this requirement shall conform to QS9000 record retention requirements. WORLDWIDE FASTENER STANDARD2005-02-01Printed copies are uncontrolled C
10、opyright 2005, Ford Global Technologies, LLC. Page 2 of 2 Table 1 - Ultimate Tensile Loads and Proof Loads for ISO Metric Coarse Threads. These tables have been provided to assist Design Engineers. For all other requirements ISO 898/1 shall be referenced. Table 1 Nominal Thread Diameter d (mm) Pitch
11、 of the Thread p (mm) Nominal Stress Area Asnom. (mm2) Property Class 4.8 8.8 10.9 4.8 8.8 10.9 Minimum Ultimate Tensile Load N Proof Load N 4 0.7 8.78 3690 7020 9130 2720 5100 7290 5 0.8 14.2 5960 11350 14800 4400 8230 11800 6 1 20.1 8440 16100 20900 6230 11600 16700 7 1 28.9 12100 23100 30100 8960
12、 16800 24000 8 1.25 36.6 15400 29200 38100 11400 21200 30400 10 1.5 58.0 24400 46400 60300 18000 33700 48100 12 1.75 84.3 35400 67400 87700 26100 48900 70000 14 2 115 48300 92000 120000 35600 66700 95500 16 2 157 65900 125000 163000 48700 91000 13000018 2.5 192 80600 159000 200000 59500 115000 15900020 2.5 245 103000 203000 255000 76000 147000 20300022 2.5 303 127000 252000 315000 93900 182000 25200024 3 353 148000 293000 367000 109000 212000 293000
