Spring Loaded Toggle Latch 196N Stainless Steel for Flight Case

5502-59-S04-ZG Stainless Steel Double Spring Loaded Toggle Latch - Complete Latching Set

Specifications

Product Overview & Positioning

The 5502-59-S04-ZG is a premium stainless steel spring loaded toggle latch set from NRH, belonging to the Double Spring Latch category. This model is manufactured from high-quality SUS304 stainless steel with a vibratory finishing treatment, offering excellent corrosion resistance and a fine matte finish. As a double spring loaded latch, it features a built-in dual spring mechanism and comes as a complete set including both the latch hook and strike plate, making it suitable for 196N-rated vibration-resistant latching applications in flight cases, medical equipment, military transit cases, firefighting cases, and industrial machinery.

Key Features

• Dual Spring Mechanism: Built-in dual spring design provides extension and retraction during opening/closing, automatically tensioning the lid for stable case sealing.
• Vibration Damping Function: The dual spring system absorbs mechanical vibration and shock during transport and operation, preventing accidental lid opening and reducing noise.
• Over-Center Self-Locking: Combines lever and over-center mechanism. When fully pressed flat, the mechanism self-locks - external vibration actually tightens the latch further, making it vibration-resistant and highly secure.
• SUS304 Stainless Steel & Vibratory Finishing: SUS304 stainless steel offers excellent stamping formability and structural strength, and does not rust. The vibratory finishing creates a smooth, dirt-resistant, easy-to-clean surface that eliminates sharp edges.
• Complete Latching Set: Includes both hook and strike plate - no additional parts required.

Working Principle Explained

The 5502-59-S04-ZG is a spring loaded toggle latch. Its working principle combines spring-loaded extension/retraction with over-center self-locking.

• Open State: The hook pivots on a fixed base plate. When lifted upward, the springs stretch and the hook disengages from the strike plate.
• Closing Process: When pressed downward, the hook slides into the strike plate opening. As the latch approaches horizontal, the dual springs provide retraction force, automatically pulling the latch into the locked position.
• Locked State: Once fully pressed flat, the mechanism passes the over-center point and self-locks. The dual springs maintain continuous tension, keeping the lid tightly sealed. When external vibration occurs, the spring system absorbs impact energy while the over-center lock prevents reverse opening.
• Enhanced Sealing: The continuous tension from the dual springs compensates for gasket aging or thermal expansion/contraction, maintaining consistent sealing performance over time.

Material & Finish Advantages

SUS304 Stainless Steel: Contains 18% chromium and 8% nickel, providing excellent corrosion resistance against moisture, acids, alkalis, and high temperatures. It is lead-free and mercury-free, suitable for food contact and medical device hygiene requirements.

Vibratory Finishing: This process uses vibrating media to finely grind the stainless steel surface, removing burrs and oxide scale, resulting in a uniform, smooth, satin finish. The vibratory finished surface resists dirt adhesion, is easy to clean and disinfect, and eliminates sharp edges that could scratch operators or case contents. This finish is particularly suitable for medical equipment, food processing devices, laboratory instruments, and premium flight cases where hygiene and appearance matter.

Installation & Usage Guide

Based on the drawing, key dimensions: overall length approx. 67mm, two Ø4mm mounting holes. Installation steps:

• Tools: Ø4.2mm drill bit, M4 tap (for metal cases), screwdriver.
• Marking: Place the hook on the lid edge and mark its 2 hole positions. Close the lid, place the strike plate on the case body aligned with the hook, and mark its 2 holes.
• Drilling: Drill Ø4.2mm holes. For plastic or wood, use self-tapping screws. For metal, tap M4 threads or use rivet nuts.
• Screw selection: Use M4×8-12mm stainless steel pan head screws with anti-rust washers. For vibrating environments, use medium-strength threadlocker (e.g., Loctite 243).
• Alignment: Loosely mount both parts, close the lid, and press the latch. The springs should provide proper retraction force.
• Anti-vibration: Check screw tightness every 6 months.
• Storage: Store in a dry place. Do not stack in humid, cold areas to avoid rust or oxidation.

Typical Applications

Based on the 196N load capacity, SUS304 stainless steel construction, and dual spring damping characteristics, this latch set is ideal for:

• ATA Flight Cases: Stage audio, film camera equipment, drone transport cases. Double springs absorb transport vibration, protecting sensitive equipment.
• Medical Equipment Cases: Portable ultrasound, defibrillator emergency kits, mobile nursing carts.
• Military Transit Cases: Communication equipment cases, night vision storage boxes, ammunition carrying cases.
• Firefighting Cases: Personal protective equipment cases, rescue tool storage boxes.
• Industrial Machinery Enclosures: Cabinet access doors, control panel covers, vibrating screen enclosures.
• Chemical Laboratory Cases: Acrylic cases and chemical experiment equipment requiring stable sealing.
• Insulation & Sealed Boxes: Dual springs provide continuous tension, compensating for gasket aging or temperature-induced gaps.
• Instrument Cases: Precision instrument transport cases, laboratory equipment boxes.

Important Notes

• Do not wipe the surface with rainwater or acidic liquids.
• Do not use a polisher or abrasive tools on this product.
• Do not arbitrarily change the product's hole spacing to avoid unnecessary damage.
• Do not arbitrarily disassemble or replace product parts to avoid damage.
• Please use the product according to its load capacity to avoid unnecessary loss from overloading.
• If welding the product, use the unfinished product to avoid high-temperature damage to the plating.

Ordering & Compliance Information

This product is a complete latching set (hook + strike plate). Certifications (e.g., RoHS, REACH) are available upon request. OEM/ODM customization including laser marking and special packaging is supported. NRH offers CAD, 3D, UG, and SOLIDWORKS data download services for technical support.