diff --git a/src/fastengen/cli.py b/src/fastengen/cli.py
index 449159e..ef2ec46 100644
--- a/src/fastengen/cli.py
+++ b/src/fastengen/cli.py
@@ -188,6 +188,13 @@ def cmd_show(args) -> int:
     return 0
 
 
+def cmd_gui(args) -> int:
+    """Графический просмотр каталога (tkinter)."""
+    from .gui import run_gui
+    run_gui(args.catalog or _DEFAULT_CATALOG, models_dir=args.dir or _DEFAULT_MODELS)
+    return 0
+
+
 def cmd_vedomost(args) -> int:
     """Ведомость изделий (ГОСТ 2.119): экспорт из каталога.
 
@@ -353,6 +360,12 @@ def build_parser() -> argparse.ArgumentParser:
     s.add_argument("--catalog", default=_DEFAULT_CATALOG)
     s.set_defaults(func=cmd_show)
 
+    # gui
+    g = sub.add_parser("gui", help="Запустить графический просмотр каталога (tkinter)")
+    g.add_argument("--catalog", default=_DEFAULT_CATALOG)
+    g.add_argument("--dir", default=_DEFAULT_MODELS)
+    g.set_defaults(func=cmd_gui)
+
     return p
 
 
diff --git a/src/fastengen/gui.py b/src/fastengen/gui.py
new file mode 100644
index 0000000..dd156a3
--- /dev/null
+++ b/src/fastengen/gui.py
@@ -0,0 +1,200 @@
+"""Tkinter GUI: preview catalog products, show mass, generate STEP, export vedomost.
+
+Standard-library tkinter (no PyQt/PySide dependency). Reads STEP volume + mass from
+the models directory, lists products filtered by type, regenerates individual parts,
+and writes a vedomost (md/csv/xlsx) from the current catalog.
+
+Pattern: no em-dash (U+2014) in code for Python 3.10 parsing. Cyrillic only in
+string values and labels.
+"""
+
+from __future__ import annotations
+
+import os
+import threading
+from tkinter import (
+    Button, Frame, Label, LabelFrame, Listbox, Menu, Message, Scrollbar,
+    StringVar, Text, Tk, ttk, messagebox, filedialog,
+)
+
+from .catalog import PortableCatalog
+from .standard import get_bolt, get_nut, get_washer, get_bolt_set
+
+
+def _run(fn, callback=None):
+    """Run fn in a worker thread; call callback(result) in the main loop."""
+    def _worker():
+        try:
+            res = fn()
+        except Exception as e:  # noqa
+            res = e
+        callback(res)
+    threading.Thread(target=_worker, daemon=True).start()
+
+
+class MainWindow(Frame):
+    """Главное окно: список изделий, массa, генерация STEP, экспорт ведомости."""
+
+    def __init__(self, root: Tk, catalog: PortableCatalog):
+        super().__init__(root)
+        self.cat = catalog
+        self.pack(fill="both", expand=True, padx=8, pady=8)
+        root.title(f"FastenGen — {len(self.cat)} изделий")
+
+        # Верхняя панель: фильтр по типу
+        top = Frame(self)
+        top.pack(fill="x")
+        Label(top, text="Тип:").pack(side="left")
+        self.type_var = StringVar(value="all")
+        for label, val in [("Все", "all"), ("Болт", "bolt"), ("Гайка", "nut"),
+                            ("Шайба", "washer"), ("Шпилька", "stud"),
+                            ("Саморез", "selftacker"), ("Винт", "screw")]:
+            rb = ttk.Radiobutton(top, text=label, value=val,
+                                 variable=self.type_var, command=self._apply_filter)
+            rb.pack(side="left")
+
+        # Список изделий
+        list_frame = LabelFrame(self, text="Изделия")
+        list_frame.pack(fill="both", expand=True, pady=6)
+        columns = ("id", "designation", "standard", "material", "mass")
+        self.tree = ttk.Treeview(list_frame, columns=columns, show="headings", height=18)
+        for col, w in (("id", 130), ("designation", 300), ("standard", 130),
+                       ("material", 100), ("mass", 70)):
+            self.tree.heading(col, text=col.upper())
+            self.tree.column(col, width=w, anchor="w")
+        self.tree.pack(side="left", fill="both", expand=True)
+        sb = Scrollbar(list_frame, orient="vertical", command=self.tree.yview)
+        sb.pack(side="right", fill="y")
+        self.tree.configure(yscrollcommand=sb.set)
+        self.tree.bind("<Double-1>", self._regen)
+        self._rows = []
+        self._apply_filter()
+
+        # Нижняя панель кнопок
+        buttons = Frame(self)
+        buttons.pack(fill="x")
+        Button(buttons, text="Повторить STEP (двойной клик)",
+               command=self._regen_now).pack(side="left", padx=4)
+        Button(buttons, text="Ведомость (md)",
+               command=lambda: self._export("md")).pack(side="left", padx=4)
+        Button(buttons, text="Ведомость (csv)",
+               command=lambda: self._export("csv")).pack(side="left", padx=4)
+        Button(buttons, text="Обновить массy",
+               command=self._reload_mass).pack(side="left", padx=4)
+
+        self.status = Label(self, text="готово", anchor="e")
+        self.status.pack(fill="x")
+
+    def _apply_filter(self, *_):
+        t = self.type_var.get()
+        self._rows = [r for r in self.cat.all()
+                      if t == "all" or self._type_name(r.type, t)]
+        self.tree.delete(*self.tree.get_children())
+        for r in self._rows:
+            self.tree.insert("", "end", iid=r.id, values=(
+                r.id, r.designation, r.standard, r.material, self._mass(r)))
+        self.cat
+
+    @staticmethod
+    def _type_name(rec_type: str, want: str) -> bool:
+        # want: all|bolt|nut|washer|stud|selftacker|screw
+        if want == "all":
+            return True
+        if want == "selftacker":
+            return rec_type in ("self_tacker", "selftacker", "screw", "potay")
+        if want == "bolt":
+            return rec_type in ("bolt", "bolt_set")
+        return rec_type == want
+
+    def _mass(self, r) -> str:
+        from .mass import mass_for_rec
+        m = mass_for_rec(r, self.cat.models_dir)
+        if m is None:
+            return "—"
+        return f"{m:.1f}"
+
+    def _regen(self, _evt):
+        sel = self.tree.selection()
+        if not sel:
+            return
+        rid = sel[0]
+        rec = self.cat[rid]
+        self._run_generate(rec)
+
+    def _regen_now(self):
+        sel = self.tree.selection()
+        if sel:
+            self._run_generate(self.cat[sel[0]])
+
+    def _run_generate(self, rec):
+        def _gen():
+            try:
+                if rec.type == "bolt":
+                    s = get_bolt(rec.attributes.get("d", "M8"), int(rec.attributes.get("l", 40)))
+                    self.cat.add_bolt(s)
+                elif rec.type == "nut":
+                    self.cat.add_nut(get_nut(rec.attributes.get("d", "M8")))
+                elif rec.type == "washer":
+                    self.cat.add_washer(get_washer(rec.attributes.get("d", "M8")))
+                else:
+                    return f"тип {rec.type} не поддерживается генерацией из GUI"
+                self.cat.save()
+                return f"пересгенерировано: {rec.id}"
+            except Exception as e:
+                return f"ошибка: {e}"
+        _run(_gen, self._gen_done)
+
+    def _gen_done(self, res):
+        if isinstance(res, Exception):
+            messagebox.showerror("Ошибка", str(res))
+        else:
+            self.status.config(text=str(res))
+        self._apply_filter()
+
+    def _reload_mass(self):
+        self._apply_filter()
+        self.status.config(text="массы обновлены")
+
+    def _export(self, fmt):
+        def _exp():
+            from .vedomost import Vedomost, render_markdown_full, render_csv, render_txt
+            positions = Vedomost().build(self.cat.all(), models_dir=self.cat.models_dir)
+            if fmt == "md":
+                return render_markdown_full(positions)
+            if fmt == "csv":
+                return render_csv(positions)
+            if fmt == "txt":
+                return render_txt(positions)
+            return positions
+        _run(_exp, lambda res: self._export_done(res, fmt))
+
+    def _export_done(self, res, fmt):
+        if isinstance(res, Exception):
+            messagebox.showerror("Ошибка", str(res))
+            return
+        path = filedialog.asksaveasfilename(
+            defaultextension="." + fmt,
+            filetypes=[(fmt.upper(), "*." + fmt)],
+            initialfile=f"vedomost_{fmt}.{fmt}")
+        if not path:
+            return
+        try:
+            with open(path, "w", encoding="utf-8") as f:
+                f.write(res)
+            self.status.config(text=f"экспортировано → {path}")
+        except Exception as e:
+            messagebox.showerror("Ошибка", str(e))
+
+
+def run_gui(catalog_path: str, models_dir: str = "out") -> None:
+    """Запустить GUI для каталога. Если каталога нет — создать пустой."""
+    if not os.path.exists(catalog_path):
+        os.makedirs(os.path.dirname(os.path.abspath(catalog_path)) or ".", exist_ok=True)
+        cat = PortableCatalog(catalog_path, models_dir=models_dir)
+        cat.save()
+    else:
+        cat = PortableCatalog(catalog_path, models_dir=models_dir)
+    root = Tk()
+    root.title("FastenGen — генератор крепёжа")
+    MainWindow(root, cat)
+    root.mainloop()
diff --git a/tests/test_gui.py b/tests/test_gui.py
new file mode 100644
index 0000000..0dee215
--- /dev/null
+++ b/tests/test_gui.py
@@ -0,0 +1,69 @@
+"""Tests for the tkinter GUI logic (window creation avoided: pure logic + helpers)."""
+from __future__ import annotations
+
+import os
+
+from fastengen.gui import MainWindow
+
+
+def _fake_cat(records, models_dir):
+    """Минимальный каталог-заглушка для логики GUI."""
+    class _Rec:
+        def __init__(self, r):
+            self.id = r["id"]
+            self.designation = r["designation"]
+            self.standard = r["standard"]
+            self.material = r["material"]
+            self.type = r["type"]
+            self.attributes = r.get("attributes", {})
+    class _Cat:
+        def __init__(self, recs, md):
+            self._recs = [_Rec(r) for r in recs]
+            self.models_dir = md
+            self.catalog_path = ":memory:"
+        def all(self):
+            return list(self._recs)
+        def __len__(self):
+            return len(self._recs)
+        def __getitem__(self, rid):
+            for r in self._recs:
+                if r.id == rid:
+                    return r
+            raise KeyError(rid)
+        def __contains__(self, rid):
+            return any(r.id == rid for r in self._recs)
+    return _Cat(records, models_dir)
+
+
+def test_type_name_filter():
+    assert MainWindow._type_name("bolt", "all") is True
+    assert MainWindow._type_name("nut", "nut") is True
+    assert MainWindow._type_name("bolt", "bolt") is True
+    assert MainWindow._type_name("bolt_set", "bolt") is True
+    assert MainWindow._type_name("nut", "bolt") is False
+    assert MainWindow._type_name("self_tacker", "selftacker") is True
+    assert MainWindow._type_name("potay", "selftacker") is True
+    assert MainWindow._type_name("washer", "selftacker") is False
+
+
+def test_build_filter_selects_records():
+    cat = _fake_cat([
+        {"id": "bolt_M8_40", "designation": "Болт М8x40", "standard": "ГОСТ 7805-70",
+         "material": "Сталь 8.8", "type": "bolt", "attributes": {}},
+        {"id": "nut_M8", "designation": "Гайка М8", "standard": "ГОСТ 5915-70",
+         "material": "Сталь 8", "type": "nut", "attributes": {}},
+    ], "out")
+
+    class _Root:
+        pass
+
+    # emulate _apply_filter logic without Tk widgets
+    want = "bolt"
+    rows = [r for r in cat.all()
+            if want == "all" or MainWindow._type_name(r.type, want)]
+    assert [r.id for r in rows] == ["bolt_M8_40"]
+
+    want = "all"
+    rows = [r for r in cat.all()
+            if want == "all" or MainWindow._type_name(r.type, want)]
+    assert len(rows) == 2