Hi-Hatch GM IICeiling Access Hatch

Get slimmer and more facilitative than Hi-Hatch GM.
300×300, 450×450, 300×600, 600×600

Installation Location

  • Ceiling

Main Features

  • Outer Frame: Wide Frame, Inner Frame: Having Workability and Designability by Slim Frame
  • Can after Construction
  • Can Install into Wooden Frame
  • (Corp.) Public Buildings Association Evaluating Product (only When Using Channel Catch)



  • 300×300(mm)
  • 300×600(mm)
  • 450×450(mm)
  • 600×600(mm)

Opening and Closing Part

  • Standard (Slide Lock) Type

  • Key Type (Key P201)

    Can Key Sharing with MMⅡf, MMHⅡ, SEⅡ, AS, NT, GS

Color Variation

  • Silver Color

  • White Color(Electrodeposition Coating)



Outer Frame, Inner Frame/ Extruded Aluminum A6063S-T5 Anodized (Custom-Made Color Available)

Model No. / Dimensions

□300 300×600 □450 □600
Model No. Standard Type Silver HHGMⅡ-303 HHGMⅡ-3060★ HHGMⅡ-454 HHGMⅡ-606
White HHGMⅡ-303W HHGMⅡ-3060W★ HHGMⅡ-454W HHGMⅡ-606W
Key Type Silver HHGMⅡ-K303 HHGMⅡ-K3060★ HHGMⅡ-K454 HHGMⅡ-K606
Dimensions Standard Dimensions 303×303 303×606 454×454 606×606
Ceiling Opening Dimensions 304×304 304×607 455×455 607×607
Inner Finishing Board Dimensions 281.2×281.2 281.2×584.2 432.2×432.2 584.2×584.2
Inner Backing Board Dimensions 280×264 264×567 415×415 567×567

* ★ is made-to-order. Please contact sales department about delivery date.
*Key type white’s decorative plate and cylinder part could not to be white color.


Extension Attachment of Hanger hook

To recommend it when the ceiling material is thicker than ceiling thickness of general conventional construction method.

  • Corresponding Dimensions : Max 95.2mm
  • Ceiling Material Thickness : Max 75mm

    (Case) Channel 1.2mm, M Bar 19mm

Channel Catch

(Corp.) Public Buildings Association Evaluating Product (only when using the channel catch)

Hanging Wire

To prevent falling inner frame by hanging the wire to inner frame and channel. Use it with spring hook attaches to (rotation axis side) long hole of inner frame.

For Square Stud Method “Z Screw”

Square stud method is construction technique using square stud differ from general construction steel-made ceiling base.

“Z screw” is NAKA Corporation’s original screw to fasten ceiling access hatch and square stud. There are some cases cannot available according to the combination of square stud method.

Custom-Made Color Available



Hanger Hook

Use hanger hook.

  • Corresponding Dimensions : Max 74.6mm
  • Ceiling Material Thickness : Max 54.4mm

    (Case) Channel 1.2mm, M Bar 19mm

If exceed above dimension, please use extension attachment (option).