NHN® 500 Series
Transom Overhead Concealed Door Closer
The NHN500 is a commercial grade transom overhead concealed door closer designed to be mounted inside the header frame/jamb so that keeps the aesthetic door appearance, ideal for the commercial entrance where surface-mount type closers are not suitable or would interfere architectural design.
Catalog – Transom Overhead Concealed Door Closer NHN500
Selection Chart
Spring size (EN) | Door width | Door weight | Opening angle | Hold open or Non hold | Model No. | ||
---|---|---|---|---|---|---|---|
Standard | Back check | Delayed action | |||||
2 | ≤850mm (33-7/16″) |
≤70kg (154lb) |
130° | Non hold | 552 | 552-BC | 552-DA |
Hold at 90° | 552H90 | 552H90-BC | 552H90-DA | ||||
Hold at 105° | 552H15 | 552H15-BC | 552H15-DA | ||||
3 | ≤950mm (37-3/8″) |
≤105kg (231lb) |
Non hold | 553 | 553-BC | 553-DA | |
Hold at 90° | 553H90 | 553H90-BC | 553H90-DA | ||||
Hold at 105° | 553H15 | 553H15-BC | 553H15-DA | ||||
4 | ≤1100mm (43-5/16″) |
≤150kg (330lb) |
Non hold | 554 | 554-BC | 554-DA | |
Hold at 90° | 554H90 | 554H90-BC | 554H90-DA | ||||
Hold at 105° | 554H15 | 554H15-BC | 554H15-DA |
Features
1. Dual speed adjustment
Two section speed adjustment (130°~10° & 10°~0°).
Two section speed adjustment (130°~10° & 10°~0°).

2. Single or Double action
Works for both single and double acting doors.
Works for both single and double acting doors.
3. Powerful yet compact
Fits into common header frames.
Fits into common header frames.
