ISO 965的本部分规定了符合ISO 262的ISO通用米制内螺纹的节径和顶径偏差和尺寸限制，其基本轮廓符合ISO 68-1。 根据ISO 965的本部分，内螺纹旨在与热浸镀锌前公差位置h最大尺寸的外螺纹配合。 规定公差质量的尺寸限制源自ISO 965-1中规定的公差。 公差位置为AZ的内螺纹的基本偏差根据以下公式计算: EIAZ=+（300+20P） 哪里 EI用微米表示。 P以毫米为单位。 公差位置为AX的内螺纹的基本偏差根据以下公式计算: EIAX=+（220P-20） 哪里 EI以微米表示； P以毫米为单位。 当按照ISO 898-2进行测试时，根据ISO 965本部分的螺纹公差制造的产品可能会出现负载故障，而无需调整其他机械性能。 根据ISO 965本部分规定，具有螺纹公差的内螺纹不得与根据ISO 965-4规定具有螺纹公差的外螺纹配合，因为此类组合将产生严重的螺纹剥落风险。 注:公差等级为6AZ的内螺纹主要用于与热处理后离心的外螺纹配合- 热浸镀锌。 公差等级为6AX的内螺纹主要用于与热浸镀锌外螺纹配合，外螺纹具有未离心的厚涂层。

This part of ISO 965 specifies deviations and limits of sizes for pitch and crest diameters for ISO general purpose metric internal screw threads conforming to ISO 262 having basic profile according to ISO 68-1. Internal screw threads according to this part of ISO 965 are intended to mate with external screw threads with maximum size of tolerance position h before hot-dip galvanizing. The limits of sizes for the tolerance quality specified are derived from tolerances specified in ISO 965-1. The fundamental deviations for internal screw threads with a tolerance position AZ have been calculated according to the following formula: EIAZ = + (300 + 20P) Where EI is expressed in micrometers. P is expressed in millimeters. The fundamental deviations for internal screw threads with a tolerance position AX have been calculated according to the following formula: EIAX = + (220P - 20) Where EI is expressed in micrometers; P is expressed in millimeters. Products made with thread tolerances according to this part of ISO 965 may show load failure when tested in accordance with ISO 898-2 without adjustment of the other mechanical properties. Internal screw threads with thread tolerances according to this part of ISO 965 must not be mated with external screw threads having thread tolerances according to ISO 965-4 because such combinations will create severe risk of thread stripping. NOTE Internal screw threads with tolerance class 6AZ are primarily intended to mate with external screw threads centrifuged after hot-dip galvanizing. Internal screw threads with tolerance class 6AX are primarily intended to mate with hot-dip galvanized external screw threads with heavy coating not centrifuged.