ASME B18.8.1 pdf free download

ASME B18.8.1 pdf free download Clevis Pins and Cotter Pins (Inch Series)
2.2.3 Clevis Pin Head Periphery. The periphery of the head shall be within a circular runout equal to 12% of the maximum head diameter or 0.020 in., whichever is greater, with respect to the axis of the shank, as deter- mined over a length under the head equal to the nominal pin diameter.

2.3 Clevis Pin Lengths All clevis pin sizes are available in a variety ofnominal lengths. Table 2 provides a means of determining the cotter pin hole location, M, for all nominal pin lengths, G, for each clevis pin size.
2.3.1 Clevis Pin Measurement. The G and M lengths of the clevis pin shall be measured, parallel to the axis of pin, from the bearing surface of the head.
2.4 Clevis Pin Hole
2.4.1 Clevis Pin Hole Location. The clevis pin hole location is dimension, M.
2.4.2 Clevis Pin Hole Alignment and Angularity. The axis of hole through the shank shall not be offset from the axis of pin by more than 0.010 in. for the 3 ⁄ 16 -in. and 1 ⁄ 4 -in. nominal pin size and 0.020 in. for all larger pin sizes, and shall be square with the axis of pin within 2 deg.
2.4.3 Clevis Pin Hole Chamfer. The hole shall be chamfered or edges otherwise relieved at both ends to remove all burrs and sharp edges.
2.5 Clevis Pin Material and Heat Treatment Unless otherwise specified by the purchaser, clevis pins shall be made ofeither low or medium carbon steel. When case hardened pins are specified, they shall be resistant to a No. 58 file in accordance with SAE J864. In the event of dispute, case hardness and depth shall be evaluated by micro-hardness according to ASTM E384. The case hardness shall be a minimum of 633 HV (HRC 57) with a depth between 0.010 in. and 0.016 in. 2.6 Clevis Pin Finish Clevis pins shall normally be furnished with a plain (as processed) finish, not plated or coated. Other finishes, where required, shall be subject to agreement between the manufacturer and the purchaser. Finishes such as the following are suitable for use on clevis pins:
(a) Electroplating per ASTM B633 or F1941 (cadmium is not a recommended finish)
(b) Hot dipped zinc coatings ASTM A153 or F2329
(c) Passivation of corrosion resistant pins per ASTM A380 2.7 Clevis Pin Workmanship Clevis pins shall be free from burrs, loose scale, sharp edges, and all other defects affecting their serviceability.
2.8 Clevis Pin Designation
Clevis pins shall be designated by the following data,in the sequence shown:
(a) product name (noun first)
(b) ASME B18.8.1
(c) nominal size (fraction or decimal equivalent)
(d) length (fraction)
(e) material
(f) protective finish, if required
2.9 Clevis Pin Marking Case hardened pins shall be marked with a capital “H” located in the center of the top of the head. The manufacturer’s identification mark shall also be located anywhere on top of the head. Marks may be raised or indented.
3 GENERAL DATA — COTTER PINS
3.1 Cotter Pin Application The cotter pins specified are intended for use with clevis pins contained herein and in pinned bolt and nut assemblies or other type of free-fitting pinned assem- blies in general applications.
3.2 Cotter Pin Head Design A degree of leeway shall be permissible in the design of the head provided; however, the specified minimum outside diameter is maintained as specified in Table 4.
3.3 Cotter Pin Length 3.3.1 Cotter Pin Measurement. The length of pin, L, shall be measured, parallel to the axis of the pin, from the plane of contact of a gage (see Fig. 1) with the head of the pin to the end of the prong or pin as depicted in the illustrations for the respective points types. The gage shall have a hole equal to the specified gage hole diame- ter (see Table 4) within a tolerance of ±0.001 in. The permissible break or rounding at the gauging edges of gauging holes shall not exceed 0.005 in. The pin shall be inserted into the gage with finger pressure (force not to exceed 8 oz). Where pins having point types other than those illus- trated hereinaregauged,the length,L,shall be measured from the plane of contact of the gage with the end of the shortest prong.
3.3.2 Cotter Pin Tolerance on Length. The tolerance on length of cotter pins shall be as specified in Table 3.