1、 WORLDWIDE FASTENER STANDARD WE 955 2016 09 09 MECHANICAL AND PERFORMANCE PROPERTIES OF NUTS WITH SPECIFIED PROOF LOAD VALUES FOR HEXAGON FLANGED NUT AND HEXAGON FLANGED NUT both faces shall be clean and lubricant free. The dimensions must be as specified in WZ 100. The faces must be flat and parall
2、el within a tolerance zone of 4% of the specified minimum thickness. The surface roughness of the abutment face shall fall within the range N4 - N5 to ISO 1302. Test washers must be designed such that when assembled into the test equipment, rotation of the washer is prevented during tightening of th
3、e nut. Any device used to prevent rotation must not intrude into a diameter equal to the maximum bearing face diameter of the prevailing torque nuts. Alternatively, multi-holed plates may be used provided that they conform to the requirements for hardness, hole dimensions, surface condition, thickne
4、ss, flatness and parallelism. The abutment face shall be re-prepared in accordance with the above between each test or a new washer used. 6.6 TEST BOLT Threads shall be in accordance with ISO 965/1 within a tolerance of class 6g min. to 4h max. Threads on all bolts shall be produced by rolling. Bolt
5、 length shall be such that 4 to 7 thread pitches, as measured from the end of the bolt, will protrude through the nut when the nut is seated against the test washer. Thread length shall be such that a minimum of two full threads are within the grip after the nut is seated. The bolt shall have a poin
6、t which is flat and chamfered. The thread surface shall be free of burrs or other contamination that might affect an accurate determination of the performance of the nut. The bolt shall have an ultimate strength related to the specified property class of the nut to be tested (except for proof load t
7、esting - See Clause 6.1) and the properties shall be in accordance with ISO 898-1. A new bolt shall be used for testing each nut. The bolt used for testing prevailing torque nuts with metallic coatings shall have the finish of S437U. WORLDWIDE FASTENER STANDARD WE 955 2016 09 09 MECHANICAL AND PERFO
8、RMANCE PROPERTIES OF NUTS WITH SPECIFIED PROOF LOAD VALUES FOR HEXAGON FLANGED NUT AND HEXAGON FLANGED NUT & CONICAL WASHER ASSEMBLIES Printed copies are uncontrolled Copyright 2016, Ford Global Technologies, LLC Page 7 of 7 Table 1. Proof load values per ISO 898-2 - ISO Metric Coarse Threads Nomina
9、l Thread Pitch of the Thread Nominal Stress Area of the Property Class Diameter Mandrel 04 05 8 10 12 mm mm As mm2 Proof load (As x Sp), N 3 3.5 4 5 6 7 8 10 12 14 16 18 20 22 24 27 30 33 36 39 0.5 0.6 0.7 0.8 1 1 1.25 1.5 1.75 2 2 2.5 2.5 2.5 3 3 3.5 3.5 4 4 5.03 6.78 8.78 14.2 20.1 28.9 36.6 58.0
10、84.3 115 157 192 245 303 353 459 561 694 817 976 1 910 2 580 3 340 5 400 7 640 11 000 13 900 22 000 32 000 43 700 59 700 73 000 93 100 115 100 134 100 174 400 213 200 263 700 310 500 370 900 2 500 3 400 4 400 7 100 10 000 14 500 18 300 29 000 42 200 57 500 78 500 96 000 122 500 152 000 176 500 229 5
11、00 280 500 347 000 408 500 488 000 4 000 5 400 7 000 12 100 17 200 24 700 31 800 50 500 74 200 101 200 138 200 176 600 225 400 278 800 324 800 422 300 516 100 638 500 751 600 897 900 5 200 7 050 9 150 14 800 20 900 30 100 38 100 60 300 88 500 120 800 164 900 203 500 259 700 321 200 374 200 486 500 5
12、94 700 735 600 866 000 1 035 000 5 800 7 800 10 100 16 300 23 100 33 200 42 500 67 300 100 300 136 900 186 800 230 400 294 000 363 600 423 600 550 800 673 200 832 800 980 400 1 171 000 NOTE: Property Class 12 has been included for combination with P.C. 10.9 fasteners that are to be tightened beyond the proof load (i.e., yield point tightening). See ISO 898-2 Annex - Loadability of bolted connections.
