ISO 261 is general purpose metric screw threads — General plan
ISO 68-1 is general purpose screw threads — Basic profile — Part 1: Metric screw threads
ISO 261 specifies ISO general purpose metric screw threads (M) having basic profile according to ISO 68-1. Basic dimensions are given in ISO 724. For tolerances see ISO 965-1.
ISO 68-1 specifies the basic profile for ISO general purpose metric screw threads (M).
ISO 261 Normative references as follows:
ISO 68-1:1998, ISO general purpose screw threads — Basic profile — Part 1: Metric screw threads.
ISO 262:1998, ISO general purpose metric screw threads — Selected sizes for screws, bolts and nuts.
ISO 724:1993, ISO general purpose metric screw threads — Basic dimensions.
ISO 965-1:1998, ISO general purpose metric screw threads — Tolerances — Part 1: Principles and basic data.
ISO 5408:1983, Cylindrical screw threads — Vocabulary.
ISO 68-1 Normative references as follows:
ISO 965-1:1998, ISO general purpose metric screw threads — Tolerances — Part 1: Principles and basic data.
ISO 5408:1983, Cylindrical screw threads — Vocabulary.
ISO 261 is International Standard ISO 261 was prepared by Technical Committee ISO/TC 1, Screw threads, Subcommittee SC 1, Basic data.
ISO 68 consists of the following parts under the general title ISO general purpose screw threads — Basic profile
— Part 1: Metric screw threads
— Part 2: Inch screw threads
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