1、 WORLDWIDE FASTENER STANDARDWK 900 Date: 2005-11-01 Printed copies are uncontrolled Copyright 2005, Ford Global Technologies, LLC Page 1 of 3 Hoseclamps - Worm Drive Foreword: February 2005 During the February 2005 update the surface finish of the screw component was updated. Prior to the February 2
2、005 update the surface finish on the screw was specified to be in accordance with S309, this finish had to be eliminated to remove usage of Hexavalent Chromium. The choice of finish is now the responsibility of the manufacturer, however, the surface finish shall not contain any restricted substances
3、 and shall comply with WSS-M99P9999-A1. It is the responsibility of the manufacturer to ensure that the mechanical performance of the clamp is not impacted by the screw surface finish change. In order to comply with the requirements of WSS-M99P9999-A1 elimination of Hexavalent Chromium by changing t
4、o a new surface finish shall occur before July 2005. During the February 2005 update the band thickness was corrected to 0.7 +/- 0.1 mm. This correction was necessary to line up the standard with other Company, National and International standards. November 2005 A note was added to section 4.0 Mater
5、ials to allow an exception to the requirements of WSS-M99A3-A and allow the screw component to be electroplated. The screw component is under relatively low stress, these screws have been electroplated for many years without any known issues. WORLDWIDE FASTENER STANDARDWK 900 Date: 2005-11-01 Printe
6、d copies are uncontrolled Copyright 2005, Ford Global Technologies, LLC Page 2 of 3 1. SCOPE: This specification covers the dimensions, material and performance of worm drive hoseclamps. NOTE: The torques specified are test requirements and are not recommended as tightening torques for assembly purp
7、oses. 1.1 REFERENCES: ASTM A 176 UNS or BS 1449 Part 2 1983 Specification for stainless and heat-resisting chromium steel plate, sheet and strip. WSD-M1A283-B1 to B6, B47 to B49, or B57 Steel, cross reference for standard parts. 2. GENERAL: Alternative screw and thread sizes and means of screw reten
8、tion are permissible provided all other requirements of this specification are met. The worm drive slots on the band must be formed and not pierced and the forming shall not protrude radially within the band diameter. NOTE: Although the screw thread may vary, the screw head must remain in accordance
9、 with Figure 1 and Table 1. 3. DIMENSIONS: The dimensions of worm drive hoseclamps shall be as specified in Figure 1 and Table 1. Parts shall be supplied to Ford at diameter B +2/-0 as specified in Table 1. 4. MATERIAL: The material for the band and screw housing shall be Stainless Steel to ASTM A 1
10、76, UNS S43000, or BS 1449 Part 2 430S17 Rm450 - 600 MN/m2or X6Cr17 DIN 17440 Rm450 - 600 MN/m2. The material for the screw component of Hoseclamps - Worm Drive, “All Stainless“ shall be manufactured from Stainless Steel to ASTM A 176, UNS S43000, or BS 1449 Part 2 430S17 Rm450 - 600 MN/m2or X6Cr17
11、DIN 17440 Rm450 - 600 MN/m2. The material for the screw component of Hoseclamps - Worm Drive, “Carbon Steel Screw“ shall be manufactured from steel to WSD-M1A283-B1 to B6, B47 to B49, or B57. The screw shall be suitably protected from corrosion and shall provide a minimum of 120 hours resistance in
12、accordance with SAE/USCAR 001, the choice of surface finish shall be the responsibility of the manufacturer. The surface finish shall meet the requirements of WSS-M99P9999-A1 (see Foreword). The electroplating restriction in WSS-M99A3-A does not apply to the screw component. Although the hardness of
13、 the screw component exceeds 390 HV in some instances, the screw is under relatively low stress in service and therefore the use of electroplated finishes is acceptable. 5. PERFORMANCE: With the hoseclamp mounted on a steel mandrel of diameter B max and torqued to 1.5 Nm a wire of diameter 1mm max s
14、hall not pass between the mandrel and the clamp. When the clamp is further torqued to 5 Nm min the teeth on the screw shall not strip or mesh over the teeth on the band. The clamp shall be loosened and then re-tightened to 5 Nm min without failure. With the hose clamp mounted on a mandrel of diamete
15、r C min and torqued to 1.5 Nm a wire of diameter 1 mm max shall not pass between the mandrel and the clamp. The free running torque through the diameter range shall not exceed 0.7 Nm. WORLDWIDE FASTENER STANDARDWK 900 Date: 2005-11-01 Printed copies are uncontrolled Copyright 2005, Ford Global Techn
16、ologies, LLC Page 3 of 3 Figure 1 0.7 0.7 +/- 0.1 Table 1 Dimensions in mm Part Numbers Part Numbers L+/-1 A Max Diameter B +2/- 0 Diameter C+/-2 Diameter Ref Carbon Steel Screw All Stainless 24 24 24 24 24 26 26 26 26 26 26 26 26 26 9 9 9 9 9 11 11 11 11 11 11 11 11 11 16 20 25 28 32 35 40 45 50 60
17、 70 80 90 100 12 12 16 16 20 23 25 30 32 40 50 60 70 80 A B C D E F G H I J K L M N W525900 W525901 W525902 W525903 W525904 W525905 W525906 W525907 W525908 W525909 W525910 W525911 W525912 W525913 W525930 W525931 W525932 W525933 W525934 W525935 W525936 W525937 W525938 W525939 W525940 W525941 W525942 W525943 The part numbers for the All stainless version should not be used for new design. For new design part numbers selected from WK 903 should be used.
