ISO 7043:2012 pdf free download.Prevailing torque type hexagon nuts with flange (with non-metallic insert), style 2 — Product grades A and B.
ISO 7043:2012 specifies the characteristics of prevailing torque type hexagon nuts with flange (with non-metallic insert), of style 2, with threads from M5 to M20 inclusive, in product grade A for threads up to and including M16 and product grade B for threads above M16, and with property classes 8, 9 and 10.
2 Normative references
ISO 225, Fasteners-Bolts, screws, studs and nuts-Symbols and descriptions of dimensions;
ISO 261, /SO general purpose metric screw threads- General plan;
ISO 724, /SO general-purpose metric screw threads-Basic dimensions;
ISO 898-2, Mechanical properties of fasteners made of carbon stee/ and alloy steel- Part 2: Nuts with specified property classes- Coarse thread and fine pitch thread;
ISO 965-2, SO general purpose metric screw threads-Tolerances-Part 2 Limits of sizes for general purpose external and internal screw threads-Medium quality;
ISO 2320, Prevailing torque type steel nuts-Mechanical and performance properties;
ISO 3269, Fasteners- Acceptance inspection;
ISO 4042, Fasteners- Electroplated coatings;
A.1 Recommended method for gauging of hexagon
See Figure A 1 and Table A.
The nut shall be gauged using two plain ring gauges, A and B, to demonstrate the coincidental acceptability of hexagon height, wrenching height, corner fill and width across corners. Gauge A shall be placed over the hexagon and shall be seated on the flange. Gauge B shall be placed on the top of the nut normal to the nut axis. The two gauges shall not be in contact.
A.2 Recommended method for gauging flange thickness
See Figure A1 and Table A1.
Gauge C is a flat feeler or ring gauge. It is used to prove that the flange thickness at the junction of the gauge with the hexagon portion is equal to or greater than specified values. The acceptance criterion is that gauge C fits under gauge A without contact where the nut is seated on a flat plate.
ISO 7043:2012 pdf download
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