Lock blank ZMK-585M7 from alloy ZlSrNC 750-150-7.5

ZMK-585M7 is a lock blank model for jewelry items. The material is specified separately: alloy ZlSrNC 750-150-7.5, supplied per TU for lock blanks.

What this item is

The number 585 in the model designation is not used here as independent proof of the material’s fineness: the confirmed composition line indicates a 750-fineness gold alloy. Before production, verify the model, material, and design specification in a single supplier document.

Composition and documents

• Grade: ZlSrNC 750-150-7.5
• Gold: 75.0–75.5% by mass
• Silver: 14.5–15.5% by mass
• Nickel: 7.0–8.0% by mass
• Zinc: balance
• Supply document: TU 9641-824-05785324-2006

The grade ZlSrNC 750-150-7.5 belongs to the gold–silver–nickel–zinc system. The composition confirms the presence of nickel and zinc, but does not by itself specify hardness, color standard, dimensions, or part readiness. These parameters depend on the supply condition and technology. The actual batch is accepted per the quality document.

Applications and technological role

• manufacturing a chain or bracelet clasp after checking mating dimensions;
• assembly of a jewelry component with the chosen attachment method and subsequent finishing;
• repair or serial production only when the model, geometry, and alloy match;

What to coordinate before ordering

Before ordering, request the ZMK-585M7 drawing, dimensions, weight, mounting and connection sizes, supply condition, completeness, and allowable deviations. Coordinate the mounting method, solder, heating mode, and finishing requirements. The invoice and passport must include both the lock model and the grade ZlSrNC 750-150-7.5 to prevent substitution based solely on the index.

Safety and handling

The alloy contains nickel: avoid dust generation and prolonged contact of contaminated surfaces with skin. Use local exhaust ventilation, eye protection, and gloves; consult the safety data sheet for PPE requirements. During soldering, control flux fumes and heated parts. Store chips and dust separately.