FORD WH902-1993 GENERAL REQUIREMENTS AND APPLICATION GUIDELINES FOR CLEVIS PINS《U形销的一般要求和应用指引》.pdf

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1、FORD WORLDWIDE FASTENER STANDARDDate: 1993-01-01Engineering Standards & 1 of 2 Printed copies are uncontrolled .Systems Engineering (ESSE)WH 902General Requirements and Application Guidelines for Clevis Pins1. SCOPE This standard specifies the dimensional and general requirements for metric clevis p

2、ins intendedfor general use.1.1 REFERENCES.ISO 6507 - Metallic materials - Hardness t est - Vickers test.WSD-M1A283-B43/B44/B45/B46 - Steel, cross reference for standard parts.2. GENERAL REQUIREMENTS.2.1 The top of the head shall be flat and either chamfered or rounded at the outer periphery. Thebea

3、ring surface of the head shall be flat and square with the axis of the pin within 2 o (determinedover a distance equivalent to 1.5 pin diameters from under the head). The axis of the head shall belocated at a true position with respect to the axis of the shank within a tolerance zone diameterequival

4、ent to 6% of the maximum head diameter or 0.25mm whichever is greater.2.2 LENGTH. The length of clevis pins shall be measured parallel to the axis of the pins, from thebearing surface of the heads to the centerline of the holes. For length increments and tolerances,see Table 1.Table 1.Dimensions in

5、mmLength Increments Tolerance-10 +/- 0.2912-14-16-18 +/- 0.3520-22-25-28-30 +/- 0.4235-40-45-50 +/- 0.5055-60-65-70-75-80 +/- 0.602.3 HOLE. The hole location on all clevis pi ns shall be specified as the distance, measured parallel tothe axis of the pin, from the bearing surface of the head to the c

6、enterline of the hole. The axis ofthe hole through the shank shall not be offset from the axis of the pin by more than 0.25mm for 5and 6mm nominal pins and 0.5mm for larger size pins, and shall be square within 2 o of the axis ofthe pin. The hole may be chamfered or processed so that the hole is uno

7、bstructed and free fromburrs.3. MATERIAL AND HEAT TREATMENT.3.1 MATERIAL. Ste el to WSD-M1A283-B43/44/45/46.3.2 HEAT TREATMENT. Case harden and temper to a minimum surface hardness of HV 700(HR15N 90.3) with a case depth of 0.1 to 0.2mm.4. HARDNESS TESTING. Hardness testing shall be performed in acc

8、ordance with the followingprocedures:Vickers Hardness to ISO 6507 - 5 kg load.5. FINISH For general use, S309M should be specified for case hardened pins. Parts to these guidelines aresusceptible to embrittlement and must not be electrolytically plated (See WX 100).6. DEFECTS. The pins shall be free

9、 from burrs, loose scale, sharp edges and all other defects which mightaffect installation or serviceability.FORD WORLDWIDE FASTENER STANDARDDate: 1993-01-01Engineering Standards & 2 of 2 Printed copies are uncontrolled .Systems Engineering (ESSE)WH 902General Requirements and Application Guidelines

10、 for Clevis Pins7. DIMENSIONS. The chart below gives the dimensional requirements for clevis pins of 5, 6, 8, 10 and12mm nominal diameters.Dimensions in mmNominal Size 5 6 8 10 12d 1 max. 4.93 5.93 7.92 9.92 11.9min. 4.85 5.85 7.83 9.83 11.79D +/- 0.5 8 10 14 18 20d 2 max. 1.45 1.85 2.25 3.5 3.5min.

11、 1.2 1.6 2 3.2 3.2c max. 2 2 2 2 3k +/- 0.15 1.6 2 3 4 4L 1 min. 3 3.5 5 6 7R max. 0.6 0.6 0.6 0.6 0.68. RECOMMENDED SPLIT COTTER PIN SIZES. The following chart gives the recommended split cotter pinsizes and lengths for clevis pins shown in the chart above.Dimensions in mm* Pin or Shaft over 4 5 6 8 9 10 12Diameter up to andincluding5 6 8 9 10 12 15Recommended Nom. Size 1.2 1.6 2 2.5 3.2 3.2 4Split Cotter Pin Length 10 12 14 16 18 20 22* For s evere application and where subjected to alternating transverse forces, the next size larger split cotter pin is recommended.