Bolt M12x1.75 GOST 7798-70 (Simplified)

## Task: Automatic Creation of a Bolt Drawing in AutoCAD You are a design engineer specializing in technical drafting and computer-aided design (CAD) using AutoCAD. **Your task is to independently create a complete technical drawing of a bolt and provide me with a DXF file that can be opened and edited in AutoCAD.** Do not simply provide instructions, code snippets, or explanations; I require a finished file containing the actual geometry. ### 1. Bolt Parameters - Standard: GOST 7798-70. - Version: 1 (no additional holes). - Metric thread diameter: d = 12 mm. - Thread pitch: P = 1.75 mm. - Hexagonal head height: H = 8 mm. - Wrench size (across flats): S = 19 mm. - Diameter of the circumscribed circle of the head: D = 21.9 mm. - Transition radius under the head: R = 0.6 mm. - Chamfer at the end of the shank: 1.8 × 45°. - Threaded length: l₀ = 35 mm. - Bolt length (from the bearing surface of the head to the end of the shank): L = 100 mm. Label above the drawing: **Bolt M12×1.75×100 GOST 7798-70** ### 2. Drawing Requirements Create a complete two-view drawing of the bolt on an A4-sized sheet. The drawing must include: 1. A main side view of the bolt. 2. An end view of the head, shaped as a regular hexagon. 3. Centerlines. 4. Correct conventional representation of the external metric thread M12×1.75. 5. A chamfer at the end of the shank. 6. The transition radius under the head, if visible in the corresponding view. 7. Dimension lines and extension lines, including all necessary dimensions. 8. The thread designation: M12×1.75. 9. A label above the drawing: "Bolt M12×1.75×100 GOST 7798-70". 10. An A4 sheet border and a neat arrangement of the projections. ### 3. Technical Requirements - Units of measurement: millimeters. - The geometry must have precise dimensions; do not draw it approximately. - Use separate layers for outlines, centerlines, and dimensions. - Adhere to mechanical engineering drawing standards and standard conventions for thread representation. - Ensure that dimensions are legible, and avoid superfluous lines or overlapping text. - Do not create a 3D model; provide a drawing consisting of two projections. - Verify the accuracy of the geometry and its compliance with the standard before saving. If certain parameters contradict the standard or each other, verify them and explain the identified issue. Do not alter the specified dimensions without explanation. ### 4. Output Format **The primary deliverable is a finished file named `bolt_M12_GOST_7798-70.dxf`.** The file must: - open in AutoCAD; - contain all constructed lines, circles, arcs, dimensions, and text; - be editable; - feature the drawing laid out on an A4 sheet; - use actual units of measurement in millimeters.

Parameters

Every value above is a live dimension. Open a model like this in the editor and each one becomes a slider you can drag before exporting.