Jewelry clasp blank ZMK-585M5 made of alloy ZlSrPdM 375-100-38

ZMK-585M5 is a model of a jewelry clasp blank. The nomenclature line links it to the TU for clasp blanks and to the alloy ZlSrPdM 375-100-38.

What this item is

The index 585M5 is a model designation, not a sufficient characteristic of the chemical composition: the alloy with gold 37.5–38.0% is explicitly specified. The drawing and passport must resolve this apparent discrepancy before manufacturing or installation.

Composition and documents

• Grade: ZlSrPdM 375-100-38
• Gold: 37.5–38.0% by mass
• Silver: 9.5–10.5% by mass
• Palladium: 3.5–4.1% by mass
• Copper: balance
• Supply document: TU 9641-824-05785324-2006

The alloy of the gold–silver–palladium–copper system has a declared gold fineness of 375 and a separate palladium range. The letters and numbers describe the chemical grade, not the product geometry. Copper makes up the remainder to the full mass. For production calculations, an actual batch analysis, material condition, and tolerances of the specific semi-finished product are required.

Applications and technological role

• blank for a clasp for chains and bracelets when the connecting dimensions match;
• assembly of the unit with subsequent finishing, polishing, and functional testing of the mechanism;
• repair use only after verifying the model, mass, and composition of the part being replaced;

What to agree before ordering

Request the drawing of ZMK-585M5, dimensions, mass, connection form, completeness, clearances, and tolerances. Agree whether the mechanism is supplied assembled or as a separate blank, what surface condition is provided, and how it is attached. The commercial offer must simultaneously include the model ZMK-585M5, the grade ZlSrPdM 375-100-38, and the TU; otherwise, the item should be clarified.

Safety and handling

Protect the surface from contamination by foreign metals. Perform cutting, grinding, and polishing with local exhaust ventilation and eye protection; collect dust and trimmings separately. When heating, use solder and flux only according to a proven technology. The safety data sheet and company regulations take precedence.