Butterfly Latch Model 6306-85 | Zinc Plated Iron Heavy Duty Latch for Equipment Cases

NRH 6306-85 Butterfly Latch - Heavy Duty, Blue Zinc Plating, 60kg Load, Industrial Case Lock

The NRH 6306-85 is a heavy‑duty butterfly latch (draw latch) designed for securing large, high‑load enclosures such as industrial toolboxes, aviation transport cases, and outdoor protection equipment. Manufactured from high‑strength steel with a distinctive blue zinc plating, it offers excellent corrosion resistance and a professional blue‑tinged finish that resists rust in demanding environments. The latch features a robust over‑center toggle mechanism, providing a secure, vibration‑proof closure with a 588N (approx. 60kg) tensile load capacity. Weighing 203g, it delivers substantial holding power for heavy lids and doors. Clear “NRH” branding ensures quality and traceability.

As a product of NRH Box Hardware (specialist since 1996), this latch is manufactured under an ISO 9001 certified system. Regarding international compliance (SGS, REACH, RoHS, SVHC), these standards can be supported based on customer requirements - contact us for details. OEM/ODM services are available for custom hole patterns, latch lengths, or logo engraving. Full 2D/3D CAD models available upon request.

Key dimensions and mounting hole patterns are provided in the engineering drawing. Refer to the technical sheet for precise installation data.

Why Blue Zinc Plating?

Blue zinc plating is an electroplated finish that provides a uniform, attractive blue‑tinted appearance while offering excellent protection against rust and corrosion. It is more economical than stainless steel and performs well in indoor or sheltered outdoor applications. The plating also adds surface hardness, reducing wear from repeated cycling. For extreme environments (marine, chemical, heavy salt spray), we recommend upgrading to stainless steel or applying additional clear coating.

Primary Applications - Built for Heavy Duty

• Heavy‑duty toolboxes - large rolling chests, industrial tool storage, mechanic's cabinets
• Industrial equipment cases - protection cases for precision instruments, machinery guards
• Aviation transport cases - flight cases for sensitive avionics, ground support equipment
• Outdoor protection cases - weather‑resistant enclosures for electronics, generators, telecom shelters
• Military & logistics containers - ruggedized transit boxes, ammunition storage

How It Works - Over‑Center Butterfly Latch

The butterfly latch features a two‑stage action. The lever is pulled up to release tension, then rotated to the side to fully open. When closing, the lever is brought down, and the over‑center mechanism pulls the two halves tightly together, creating a secure, rattle‑free seal. The latch remains locked under vibration and cannot open accidentally. The blue zinc finish ensures smooth operation even after years of use.

Key Advantages

• 60kg (588N) holding force - ideal for heavy lids and pressure‑sealed doors
• Blue zinc plating - corrosion resistant, professional blue finish, wear‑resistant
• Over‑center toggle design - vibration‑proof, self‑locking, easy to operate
• Heavy‑duty steel construction - robust, long‑lasting, field‑proven
• Precision compatibility - accurate dimensions ensure perfect fit with various case types
• OEM/ODM ready - custom sizes, hole patterns, logo stamping available

Technical Specifications

• Brand: NRH Box Hardware
• Model Number: 6306-85
• Product Name: Butterfly Latch / Draw Latch
• Material: High‑Strength Steel
• Surface Finish: Blue Zinc Plating
• Net Weight: 203g
• Tensile Load: 588N (approx. 60kg)
• Key Dimensions: Refer to engineering drawing. Mounting holes: 4×Φ5.2mm (typical - confirm with drawing)
• Compliance: ISO 9001, SGS, REACH, RoHS, SVHC (available upon request)
• Note: Data for reference only, not for mold design. Manufacturer Since 1996. OEM/ODM Services Available. 2D/3D CAD on request.

Why Trust NRH

NRH Box Hardware has been designing and manufacturing industrial latches, hinges, and handles since 1996. Our butterfly latches are trusted globally for heavy‑duty applications in aviation, industrial equipment, and logistics. The 6306-85 is produced under ISO 9001 certified quality control with full batch traceability. Compliance with REACH, RoHS, and SVHC is available upon request. For engineers needing a high‑strength, corrosion‑resistant butterfly latch, the NRH 6306-85 delivers proven reliability.