1、 WORLDWIDE FASTENER STANDARD Date: 2013 05 23 Printed copies are uncontrolled Copyright 2013, Ford Global Technologies, LLC Page 1 of 6 WK 903 HOSECLAMPS WORM DRIVE (INTEGRAL SPRING) 1. SCOPE: This specification covers the dimensions, material and performance of worm drive hoseclamps. NOTE: The torq
2、ues specified are test requirements and are not recommended tightening torques for assembly purposes. 2. GENERAL: Alternative screw and thread sizes and means of screw retention are permissible provided all other requirements of this specification are met. The worm drive slots on the band must be fo
3、rmed 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 with Figure 1 and Table 1. 3. DIMENSIONS: The dimensions of worm drive hoseclamps shall be as specified in Figure 1 and Table
4、1. Parts shall be supplied at diameter B +2/-0. 4. MATERIAL: The material for the band, screw and screw housing shall be Stainless Steel to ASTM A 240, UNS S43000, or BS 1449 Part 2 430S17 Rm 450 - 600 MN/m2 or X6Cr17 DIN 17440 Rm 450 - 600 MN/m2. The screw component and/or housing may be lubricated
5、 to assist in meeting the clamp performance requirements. The lubricant shall be contained within the housing such that there is no contamination of hose or degradation of the hose performance. The choice of lubrication (for example tin plating) is at the discretion of the manufacturer providing all
6、 requirements of the Restricted Substance Management Standard, WSS-M99P9999-A1, are met. The material for the spring components of the Hose Clamps Worm Drive with spring element shall be from Stainless Steel to ASTM A 240, UNS S 30100, or BS 1449 Part 2 301S23 Spring Bridge 1100-1300 MN/m2Rm, spring
7、 1700-1900 MN/m2or X10Cr Ni 18-8 or DIN 17440 1100-1300 Rm respectively 1700-1900 MN/m2WORLDWIDE FASTENER STANDARD Date: 2013 05 23 Printed copies are uncontrolled Copyright 2013, Ford Global Technologies, LLC Page 2 of 6 5. PERFORMANCE: The clamp should be tightened at approx. 80 rpm up to test tor
8、que 30% above recommended tightening torque. No failure, deflection or destruction is allowed. When the clamp is further tightened, no failure should occur at a torque below the destruction torque specified in table 1. 9mm bandwidth clamps shall be mounted on a steel mandrel of diameter B max and to
9、rqued to 1.5 Nm. A 1mm round feeler gauge shall not pass between the mandrel and the clamp. When the hose clamp is mounted on a mandrel of diameter (B+C)/ 2, a 1mm round feeler gauge shall not pass between the mandrel and the clamp. 12mm bandwidth clamps shall be mounted on a steel mandrel of diamet
10、er B max and torqued to 2.5 Nm. A 1.2mm round feeler gauge shall not pass between the mandrel and the clamp. When the hose clamp is mounted on a mandrel of diameter (B+C)/ 2, a 1.2 mm round feeler gauge shall not pass between the mandrel and the clamp. The free running torque through the diameter ra
11、nge shall not exceed 0.7 Nm for clamps with a 9 mm bandwidth and 1 Nm for clamps with a 12 mm bandwidth. 6. DYNAMIC PERFORMANCE TESTS: The spring performance shall be tested according to ASTM B 117/DIN 50021 SS (salt-spray) for 144 hours. The clamps should be mounted on a mandrel and torqued to 3.7
12、Nm for clamps with a 9 mm bandwidth and 5.4 Nm for clamps with 12 mm bandwidth. No spring degradation should occur during the salt-spray test cycle. There shall be no degradation of the mechanical performance of the clamp. 7. MARKING Hoseclamps shall be permanently marked with the manufactures name
13、or trademark and the appropriate size designation. The marking shall not have a negative impact on the performance of the clamp. WORLDWIDE FASTENER STANDARD Date: 2013 05 23 Printed copies are uncontrolled Copyright 2013, Ford Global Technologies, LLC Page 3 of 6 8. DESIGN CONSIDERATIONS The tighten
14、ing strategy is an important factor in achieving a sealed reliable joint. The following tightening strategy should be used for all WK903 parts: A DC nut runner shall be used to secure the clamp in a two stage process. The first stage shall use a maximum torque speed of 425rpm until 70% of the final
15、torque is achieved. The second stage shall use a maximum torque speed of 125rpm for the remainder of the securing process. The final torque value is dependant on the band width and is as follows: 3.7 +/- 0.6 Nm for 9mm wide bands. 5.4 +/- 0.9 Nm for 12mm wide bands. When WK903 parts are specified on
16、 coolant hose applications the tightening strategy shall be designated as a Significant Characteristic. WORLDWIDE FASTENER STANDARD Date: 2013 05 23 Printed copies are uncontrolled Copyright 2013, Ford Global Technologies, LLC Page 4 of 6 Figure 1 Note: The across flats dimension for the screw shall
17、 be 7 +0/-0.1 Progeral Design Shown Norma Design Shown WORLDWIDE FASTENER STANDARD Date: 2013 05 23 Printed copies are uncontrolled Copyright 2013, Ford Global Technologies, LLC Page 5 of 6 Table 1 Width A +/- 0.3 B +2/-0 C +/-2 D +/- 0.1 E max F max G +/-1 H max I Max K +/- 1 Destruction Torque Nm
18、min Recommended Tightening Torque Nm +/-15% (tol) Part Number Part Number with Spring 9 16 10 0.7 14 12 21 7 0.75 12 4 2.2 W527400 W527430 9 18 12 0.7 14 12 24 9 0.75 12 4.5 3.7 W527401 W527431 9 22 12 0.7 14 12 24 9 0.75 12 4.5 3.7 W527402 W527432 9 25 16 0.7 14 12 24 9 0.75 12 4.5 3.7 W527403 W527
19、433 9 27 16 0.7 14 12 24 9 0.75 12 4.5 3.7 W527404 W527434 9 32 20 0.7 14 12 24 9 0.75 12 4.5 3.7 W527405 W527435 9 35 23 0.7 14 12 24 9 0.75 12 4.5 3.7 W527406 W527436 9 40 25 0.7 14 12 26 11 0.75 12 5 3.7 W527407 W527437 9 45 30 0.7 14 12 26 11 0.75 12 5 3.7 W527408 W527438 9 50 35 0.7 14 12 26 11
20、 0.75 12 5 3.7 W527409 W527439 9 55 35 0.7 14 12 26 11 0.75 12 5 3.7 W527410 W527440 9 60 40 0.7 14 12 26 11 0.75 12 5 3.7 W527411 W527441 9 65 45 0.7 14 12 26 11 0.75 12 5 3.7 W527412 W527442 9 70 50 0.7 14 12 26 11 0.75 12 5 3.7 W527413 W527443 9 75 55 0.7 14 12 26 11 0.75 12 5 3.7 W527414 W527444
21、 9 80 60 0.7 14 12 26 11 0.75 12 5 3.7 W527415 W527445 9 85 65 0.7 14 12 26 11 0.75 12 5 3.7 W527416 W527446 9 90 70 0.7 14 12 26 11 0.75 12 5 3.7 W527417 W527447 9 95 75 0.7 14 12 26 11 0.75 12 5 3.7 W527418 W527448 9 100 80 0.7 14 12 26 11 0.75 12 5 3.7 W527419 W527449 12 27 16 0.8 15.6 13 30 12 1
22、.4 15 8.3 5.4 W527460 W527480 12 32 20 0.8 15.6 13 30 12 1.4 15 8.3 5.4 W527461 W527481 WORLDWIDE FASTENER STANDARD Date: 2013 05 23 Printed copies are uncontrolled Copyright 2013, Ford Global Technologies, LLC Page 6 of 6 12 35 23 0.8 15.6 13 30 12 1.4 15 8.3 5.4 W527462 W527482 12 40 25 0.8 15.6 1
23、3 30 12 1.4 15 8.3 5.4 W527463 W527483 12 45 30 0.8 15.6 13 30 12 1.4 15 8.3 5.4 W527464 W527484 12 50 35 0.8 15.6 13 30 12 1.4 15 8.3 5.4 W527465 W527485 12 55 40 0.8 15.6 13 30 12 1.4 15 8.3 5.4 W527466 W527486 12 60 40 0.8 15.6 13 30 12 1.4 15 8.3 5.4 W527467 W527487 12 65 45 0.8 15.6 13 30 12 1.
24、4 15 8.3 5.4 W527468 W527488 12 70 50 0.8 15.6 13 30 12 1.4 15 8.3 5.4 W527469 W527489 12 75 55 0.8 15.6 13 30 12 1.4 15 8.3 5.4 W527470 W527490 12 80 60 0.8 15.6 13 30 12 1.4 15 8.3 5.4 W527471 W527491 12 85 65 0.8 15.6 13 30 12 1.4 15 8.3 5.4 W527472 W527492 12 90 70 0.8 15.6 13 36 16 1.4 15 8.3 5
25、.4 W527473 W527493 12 95 75 0.8 15.6 13 36 16 1.4 15 8.3 5.4 W527474 W527494 12 100 80 0.8 15.6 13 36 16 1.4 15 8.3 5.4 W527475 W527495 Example Descriptions: W527400 HOSECLAMP WORM 10-16X9 SS W527480 HOSECLAMP WORM 16-27X12 SPG SS SUMMARY OF REVISIONS 2013 03 28 Updated torque requirements in 6. Revised 8 to include tightening strategy Added new alternate Progeral design to Fig. 1 Revised tolerance and values in Table 1
