NRH 5401-122C-GP yellow zinc plated mild steel strike plate for 5401 series safety latch

5401-122C-GP Long Pattern Strike Plate - Yellow Zinc Plated Mild Steel

Specifications

Product Overview

The 5401-122C-GP is a dedicated strike plate (keeper plate) for the NRH 5401-122 series long pattern draw latch system. Since 1996, NRH has specialized in precision case hardware. This strike plate is manufactured from premium mild steel with a yellow zinc plating finish, offering good corrosion resistance and mechanical strength. As the fixed counterpart of the latching system, the strike plate must be used with a matching latch hook (e.g., 5401-122-KS). It mounts on the case body or door frame, providing the anchor point for the hook to engage. This model features 3 Ø5mm through holes and 3 Ø8.6mm countersinks for flexible mounting options.

Working Principle & Function

In a complete over-center draw latch system, the strike plate serves as the critical fixed support. The latch hook mounts on the lid or door, while the strike plate mounts on the case body or frame at the corresponding position. When the hook is pressed downward, it slides into the strike plate's opening. As the hook continues to close, the interaction between the hook and strike plate generates a pulling force that draws the lid tightly against the case. Once the hook passes the over-center point and self-locks, the strike plate bears the entire latching load. The opening size, edge chamfer, and mounting position of the strike plate directly determine the latching performance. This strike plate is precision stamped with smooth, burr-free edges, ensuring smooth engagement and minimal wear.

Material & Finish Advantages

Mild Steel: With carbon content below 0.25%, mild steel offers excellent stamping formability for precision strike plates. Yield strength is approximately 200-250 MPa, capable of withstanding repeated impact loads from latching without plastic deformation.

Yellow Zinc Plating: After electroplating, a chromate passivation treatment produces the yellow finish. The passivation film on yellow zinc is thicker than that on clear zinc, providing better corrosion resistance. In dry indoor environments, it prevents rust for many years; in humid or mildly corrosive conditions, it offers basic protection. The yellow surface is smooth, facilitating smooth hook insertion and release, while the distinctive golden color matches the same-series latch hooks.

Installation Guide

Proper strike plate installation is critical for latch system performance. Follow these steps:

• Tools: Ø5.2mm drill bit (through holes), Ø8.8mm drill bit (countersinks), M5 tap (for metal cases), screwdriver.
• Positioning: Temporarily mount the latch hook on the lid at its intended position. Close the lid, place the strike plate on the case body, and adjust so the hook enters the strike plate opening centrally. Mark the strike plate mounting hole positions.
• Drilling: Drill holes according to marks. For wood or plastic, use self-tapping screws. For metal cases, tap M5 threads or use rivet nuts.
• Screw selection: Use M5×10-16mm stainless steel pan head screws (for through holes) or countersunk screws (for countersinks). For vibrating environments, use threadlocker or anti-vibration washers.
• Gap adjustment: Test with the latch closed. If there is a gap when fully locked, the strike plate is too far outward - move it inward. If the latch is very hard to close, the strike plate is too far inward - move it outward.
• Final tightening: Tighten all screws to approximately 2-3 N·m.

Matching & Selection Advice

This strike plate is specifically designed for the 5401-122 series latch hooks. Recommended pairings:

• With 5401-122-KS Latch Hook: Forms a complete 40kg load-rated latching system (hook rated 40kg, strike plate matches same level). Ideal for flight cases, military boxes, heavy-duty tool cases.
• Mounting hole compatibility: The strike plate's 3 × Ø5mm through holes and 3 × Ø8.6mm countersinks align with the hook's mounting holes (typically 3×Ø4.5 through holes + 3×Ø8 countersinks). Use same screw specifications for both components.

Maintenance & Inspection

As a fixed component, the strike plate requires minimal maintenance:

• Cleaning: Wipe the surface regularly with a dry cloth to remove dust. If rust appears (white or red rust on yellow zinc after extended use), sand lightly and apply rust-preventive paint or replace.
• Inspection: Every 6-12 months, check the strike plate opening edge for wear or deformation. If the opening develops a noticeable groove from the hook, replace the strike plate.
• Screw tightening: Check that mounting screws remain tight, especially in vibrating environments. Re-tighten and apply threadlocker if loose.

Typical Applications

The 5401-122C-GP strike plate pairs with 5401-122 series latch hooks for these applications:

• ATA Flight Cases: Stage audio, lighting equipment, film camera transport cases. Strike plate mounts on the case body, engaging with the hook on the lid.
• Military Transit Cases: Communication equipment cases, ammunition boxes, instrument cases. Yellow zinc meets basic corrosion resistance requirements.
• Medical Equipment Cases: Portable medical device transport cases, emergency kits. Yellow zinc withstands routine disinfectant wiping.
• Firefighting Cases: Fire tool storage boxes, breathing apparatus cases. Quick opening and reliable engagement.
• Heavy-Duty Tool Cases: Professional tool travel cases, equipment storage boxes. 40kg load capacity for heavy tools.
• Industrial Cabinets: Access doors, control panel latches. Strike plate mounts on the cabinet frame.

Ordering & Compliance Information

This product is the strike plate only; latch hook and screws are sold separately. Order matching 5401-122-KS series latch hook. Certifications (e.g., RoHS, REACH) are available upon request. OEM/ODM customization including laser marking and special packaging is supported.