4020 Series Door Closer - Top Jamb (Push Side) Mounting

Product Code: 4021.US28 & 4026.US28
4020 Series Door Closer - Top Jamb (Push Side) Mounting
  • Description and Uses
  • Installation Sheets & Templates

4020 Series Door Closer - Top Jamb (Push Side) Mounting

The 4020 Smoothee® is LCN’s best performing heavy duty closer designed specifically for institutional and other rugged high traffic applications.

Features and Benefits

  • Ten Million Cycles
  • Cast Iron
  • Forged Steel Main Arm
  • Double Heat Treated Steel Pinion
  • All Weather Fluid
  • LCN ® Fast™ Power Adjust
  • Fast & Accurate Installation

UK Fire Certification in accordance with BS EN 1634-1:2014 (timber) - 120 mins
UK Fire Certification in accordance with BS EN 1634-1:2014 (steel) - 60 mins
WFRC No. 142058 - Issue 4. Valid Until 1st December 2019

EN 1154: 1996 + A1: 2002/AC:2006

CE Certified. Certification applies to Top Jamb (Push Side) Mounting Only (4021)


  • Standard 4020 series closer is shipped with regular arm, standard plastic cover, and self reaming and tapping screws
  • Non-sized cylinders 4021 for interior doors to 1372mm and exterior (perimeter) doors to 1067mm
  • Sized cylinders 4026 for interior doors to 1524mm and exterior (perimeter) doors to 1220mm
  • Closer mounts top jamb (push side)
  • Standard or optional custom powder coat finish
  • Optional plated finish on metal cover, arm and fasteners
  • Optional SRI primer for installations in corrosive conditions is available with powder coat only
  • Handed for clockwise (left hand) and anti-clockwise (right hand) closing doors
  • Surface Mounting
    For interior or exterior doors. Single acting cylinder on head frame. Exposed regular arm to door top rail
  • Maximum Opening
    Butt hinge template allows 180° or 140° with optional hold open arm. For hold open points beyond 140° use 4110 series closer
  • Consult Relcross for all pivot mounted installations
  • Butt Hinges should not exceed 127mm in width
  • Auxiliary Stop is recommended
  • Reveal of 65mm allows 180° opening with regular arm, reducing to 140° opening with a 122mm reveal. The LONG ARM option allows greater opening angles - consult the sales office
  • Head Frame minimum 100mm (44mm with 4020-18G plate)
  • Top Rail minimum 38mm (51mm with 4020-18 plate & 70mm with 4020-18G plate)
  • Delayed Action add suffix DEL to the selected closer. Not available on 4026. Delays closing from maximum opening down to 75° - adjustable up to 60 seconds. NB - Delay Action falls outside the scope of the CE certification -  please contact Relcross Ltd for assistance.
  • Standard Finish - US28 powder coated silver

Mounting Options & Arms

4020 Series - Top Jamb (Push Side) Mounting

Regular Arm - 4020-3077
Non-handed arm

Long Arm - 4020-3077L
Optional non-handed arm includes 4020-79LR for deep reveals

Hold-open arm - 4020-3049
Optional, handed arm provides hold-open function, adjustable at elbow. 146 mm maximum reveal, 140° hold open

Cylinder - 4020-3071
Standard, handed cast iron cylinder assembly

Cover - 4020-72
Standard, handed plastic cover

Lead Lined Cover - 4020-72LL
Optional handed plastic cover

Metal Cover - 4020-72MC
Optional, handed cover. Required for plated finishes and custom powder coat finishes

Plate - 4020-18
Required where head frame is less than 87 mm. Plate requires minimum 44 mm minimum head frame and 51 mm top rail. 98mm maximum reveal

Plate - 4020-18G
For flush ceiling condition. Plate requires minimum 44 mm minimum head frame and 70 mm top rail

How to Specify or Order

4021 Heavy Duty Door Closer (Handed)
4026 Heavy Duty Door Closer (Handed)


US28 - Powder Coated Silver

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Relcross Ltd
Hambleton Avenue
SN10 2RT

t: 01380 729 600

w: www.relcross.co.uk
e: j.livesey@relcross.co.uk