1、 ENGINEERING MATERIAL SPECIFICATIONDate Action Revision 2009 01 06 Revised Para 3.2.1 revised dimensions, 3.2.5 Added Caution note A. Cockman, FNA 2004 03 11 Revised Para 3.2.1 para 3.2.5 added Added WSS-M21P27-A5 A. Cockman 1993 03 31 NGA1E10269419002 Released A. Cockman EM see Worldwide Standard W
2、X100 Section 3. 3. REQUIREMENTS The application of these treatments is to provide performance in addition to all applicable requirements of WX100 Clause 5. 3.1 STANDARD REQUIREMENTS FOR PRODUCTION MATERIALS Material suppliers and part producers must conform to the Companys Standard Requirements For
3、Production Materials (WSS-M99P1111-A). 3.2 PERFORMANCE REQUIREMENTS 3.2.1 WSS-M21P27-A1 Standard Part Suffix Identifier XA Position: Screws having a length of 10 mm or less shall be coated from the point to a distance of 0.25 mm to 5.2 mm from the underside of the screw head or end of the screw diam
4、eter section, as applicable. The sealer thickness shall increase the major thread diameter not less than 0.20 mm or more than 1.50 mm. Adhesion of the sealer to the screw must be greater than the cohesive strength of the material so that the sealer tends to separate rather than strip from the screw.
5、 Paint Staining: Shall not show any migration staining after 72 h exposure. Test Method: Samples of sealing compound are secured tightly to production enamel surface and placed in the fluorescent sunlamp fixture as described in FLTM BV 107-02. ENGINEERING MATERIAL SPECIFICATIONWSS-M21P27-A1/A5 Print
6、ed copies are uncontrolled Copyright 2009, Ford Global Technologies, LLC Page 2 of 4 Water Leakage Test: Test Method: Screws shall be driven into test panels 0.90 x 125 x 300 mm using stainless steel shim stock. The pilot holes shall be as specified by the Ford Standard for metal tapping screws as w
7、ell as the clearance holes for the stainless steel shim stock. Screws shall be turned full-in and shall not exceed normal torque values. Shim stock thickness shall be adjusted so that bottoming-out of screws does not occur. As received: No leaks permitted after 4 h under a 25 mm static head of water
8、. Aged 7 days at 70 +/- 2 C: No leaks permitted after 4 h under a 25 mm static head of water. Cold Shocked: No leaks permitted after 4 h under a 25 mm static head of water, and after test panel has been slammed 6 times, following 24 h at - 30 C in slam fixture as described in FLTM BV 101-01. Aged 50
9、 minutes at 115 +/- 3 C: No leaks permitted after 4 h under a 25 mm static head of water. 3.2.2 WSS-M21P27-A2 Standard Parts Suffix Identifier XB This specification covers the requirements for a wax applied to the inside diameter of hose clamp to lower the friction between the clamp and hose. Specif
10、ic requirements are being determined. 3.2.3 WSS-M21P27-A3 Standard Parts Suffix Identifier XC This specification covers the requirements for a fluorocarbon polymer based coating to be used on fasteners to reduce the adhesion of electrodeposited primers and/or coatings as well as weld splatter partic
11、les. The coatings can also reduce the friction, and therefore heat buildup, experienced with long run downs. The coating shall be applied to the flank surfaces of the threads for both internally and externally threaded product and to the contact surface, or hole, in the case of tapping plates or unt
12、hreaded nut product. The presence of absence of the coating at the crests and/or root valleys of the thread is permissible provided it does not interfere with assembly of the fastener. The coating shall have a uniform appearance and be free of tears, runs, and flaked areas. ENGINEERING MATERIAL SPEC
13、IFICATIONWSS-M21P27-A1/A5 Printed copies are uncontrolled Copyright 2009, Ford Global Technologies, LLC Page 3 of 4 Unless otherwise stated on the part drawing, the coating shall cover the complete threaded area in the case of bolt, shanked stud, and nut product and to within 3 pitches of the head i
14、n the case of fully threaded product. No coating shall be present on any drive or bearing surfaces (i.e. hexagon flats or recesses) for bolt, screw, stud, and nut product or on weld projections nibs and head surfaces for weld studs and nuts. For qualification and referee purposes, coated free-runnin
15、g bolts, studs, screws, and nuts must be able to be assembled with finger effort before and after exposure to production representative electrodeposition and/or welding processes. Similarly, coated prevailing torque bolts, studs, and nuts must meet their respective standard parts book performance re
16、quirements, or as called out on the individual drawings, before and after exposure to production representative electrodeposition or welding processes. 3.2.4 WSS-M21P27-A4 Standard Parts Suffix Identifier XD This specification covers the requirements for a water-based wax lubricant that can be adher
17、ed to metal surfaces. The applied coating provides a low coefficient of friction. Unless otherwise specified on the part drawing thread forming screws are normally coated from the point to a distance of 10 threads maximum. ISO metric threaded bolts shall be coated from the point for a distance of 8
18、to 10 full threads. No coating shall be present on any drive or bearing surfaces. This specification was released originally for a thread coating on seatbelt thread rolling screws to reduce the torque required to form the thread, but is not limited to this application. TEMPERATURE RESISTANCE: Coated
19、 fasteners shall withstand a temperature of 60 C without melting or degradation of the lubricant. THREAD FORMING CAPABILITY: When applied to thread forming screws a mating thread must be formed by driving the sample screw into the test plate until a minimum of one pitch of the screw, excluding the t
20、apered lead threads, extends beyond the plate. The axial load to ensure commencement of the thread forming process shall not exceed 20N. The test plate shall be of low carbon rolled steel having a hardness of 115 to 150 HV30. As an alternative to a test plate, unthreaded nuts may be used, for exampl
21、e nuts in accordance with WE501. Size Plate Thickness Mm Hole Size mm Maximum Thread Forming Torque N/m M6 4.9 5.2 5.5 +/- 0.05 8 M8 6.4 6.8 7.4 +/- 0.05 13 M10 8.0 - 8.4 9.3 +/- 0.05 20 M12 10.4 - 10.8 11.2 +/- 0.05 25 7/16-20 10.0 - 10.5 10.6 +/- 0.05 25 ENGINEERING MATERIAL SPECIFICATIONWSS-M21P2
22、7-A1/A5 Printed copies are uncontrolled Copyright 2009, Ford Global Technologies, LLC Page 4 of 4 3.2.5 WSS-M21P27-A5 Standard Parts Suffix Identifier XE This specification covers the requirements for a non-metallic sealer material applied to the bearing surface of fasteners. The applied material pr
23、ovides a seal between the fastener bearing surface and the mating component. Caution: For applications which require retention of clamping force a dimensioned print is recommended. NOTE: These materials may be specified on fasteners that have multiple stage finishing processes. In some cases it may
24、be advantageous to apply the sealer material prior to subsequent finishing processes. It is recommended that the processing route be agreed between the fastener maker, surface finisher and sealer applicator to meet the Ford requirements. Sealer Dimensions: Fasteners shall have sealer compound applie
25、d to the bearing face of the fastener. Material on the shank, last threads and under head radius is permitted. The dimensions of the sealer shall be the responsibility of the sealer applicator providing the desired sealing performance is met. Initial Approval of Sealer Compounds and New Suppliers. P
26、reparation of Test Assemblies: Using M16x1.5 6g Headed plugs with a surface finish in accordance with S437 (WX 100) that have sealer compound, taken from production batches, applied to the under head must be screwed into a suitable vessel capable of being pressurised to 4 bar minimum for the test du
27、ration. The thread in the pressure vessel shall be unplated, clean and dry to a 6H tolerance. A torque of 30 +/- 2 Nm shall be applied to the plug. Test Method: Fill the test assemblies with the test fluid specified below add a fluorescent dyestuff. After subjecting the test assemblies to the specif
28、ied test conditions there must be no evidence of leakage under ultra-violet light. Water/Antifreeze Resistance: Antifreeze to WSE-M97B44-B diluted to 40% with water. The test period shall be 5 hours at 120 +/- 2 C with the test assembly pressurized to 2 bar. Oil Resistance: Oil to WSE-M2C903-A2 (SAE
29、 10W30) for 5 hours at 160 +/- 2 C with the test assembly pressurized to 4 bar. Fuel Resistance: ASTM Fuel C + 15% methanol for 5 hours at 70 +/- 2 C with the test assembly pressurized to 4 bar. Automatic Transmission Fluid Resistance: Automatic transmission fluid to WSS-M2C202-B for 5 hours at 120 +/- 5 C with the test assembly pressurized to 4 bar.
