Alpro PRO50 Heavy Duty Side Load Transom Closer NHO

Alpro 510390T1-U PRO50 heavy duty (size 3) concealed transom closer with side load arm (51A2), no hold open configuration. Designed for single or double action aluminium doors up to 1150mm wide and 100kg, with a 70mm pivot point and adjustable dual closing speed.

Installs concealed within the transom header bar. Closing speed is adjustable — clockwise for slower, anti-clockwise for faster. All fixing threads should be applied with Loctite 222 or similar. Extended spindle options of 17mm, 22mm and 28mm are available by modifying the order code.

About This Product

The Alpro 510390T1-U is a heavy duty concealed transom closer from the PRO50 range, supplied with a side load top arm assembly (51A2) for 70mm pivot point installations. It is intended for installers fitting commercial aluminium door systems where a concealed closer is specified for doors up to 1150mm wide and 100kg. Choose this product for heavy traffic single or double action doors requiring a robust, hidden closing mechanism.

Key Features

• Heavy duty size 3 — doors up to 1150mm wide, 100kg max weight
• Concealed within transom header bar — 293mm x 90mm x 37mm
• Side load arm (51A2) included for 70mm pivot point
• No hold open configuration
• Adjustable dual closing speed (initial and latching)
• Stable hydraulic fluid suitable for most climatic conditions
• Extended spindle options available (17mm, 22mm, 28mm)
• Compatible with 51A10 heavy duty bottom pivot for doors up to 120kg

Technical Specifications

• Duty Rating: Heavy Duty (Size 3)
• Max Door Width: 951mm – 1150mm
• Max Door Weight (Standard Pivot): 100kg
• Max Door Weight (Heavy Duty Pivot 51A10): 120kg
• Max Door Height: 2540mm
• Pivot Point: 70mm
• Arm Type: Side Load (51A2)
• Hold Open: No
• Standard Spindle Length: 12mm
• Closer Dimensions: 293mm x 90mm
• Concealed Thickness: 37mm
• Closing Speed: Dual adjustable (initial and latching)

Common Questions

• Can I upgrade to hold open? No — this is the NHO variant. Order 510390T1-U with 90 suffix for hold open version.
• What spindle lengths are available? Standard 12mm included; 17mm, 22mm and 28mm available via modified order codes.
• Is a bottom pivot included? Yes — 51A4 bottom pivot assembly is included. Upgrade to 51A10 for doors up to 120kg.

Compatibility

• Single and double action aluminium doors
• 51A2 side load top arm assembly (included)
• 51A4 bottom pivot assembly (included)
• 51A5 F bracket (available separately for 65mm pivot)
• 51A10 heavy duty bottom pivot (available separately)

Dimensions

• Closer Body: 293mm x 90mm x 37mm