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The Yale Door Closer 51 Series has been around since the early 1970's.  With the advent of the aluminum framed storefront doors, this door closer was a perfect fit.  The 50 series is a non-sized, non-handed closer that can be mounted on the push (parallel arm), pull (regular arm) or top jamb.   A Grade 1 closer certification, means it is one of the more heavy duty closers out there.  Older models may be stamped with Scoville or Eaton, which are the companies that used to own Yale.  We some times find 20-0054-4001 or 20-0254-4001 stamped on the back of the closer.   Ships with all mounting screws and a parallel arm bracket.  The hole spacing is 3/4" by 9-1/16".

Corbin Russwin DC6210 Door Closer

Corbin Russwin’s history combines high-quality product and innovative design. That tradition continues with the new Grade 1 DC6000 Series door closer, designed and engineered with quality features such as captured valves and a complete range of new arms. The DC6000 series is the perfect closer for high-use openings or openings that must meet ADA requirements, such as schools, office buildings, health care facilities, and retail complexes. The series also meets UL and UL10C positive pressure requirements for fire openings.
Uses the same mounting bracket as the 100,110, 120 and 2800, 2810 and 2820 series and also the , DC220, DC2400, and DC2600

Older models may have SL72 or MS93 cast on the cylinders.
You may also find Clarksdale, MS cast on the cylinder also.

The Norton Door Closer 1601 has been around for the past 40 years.  With the advent of aluminum framed glass doors, Norton was on for the first manufactures to come up with a narrow stile door closer.  Because of this, it is still one of the most popular door closer model out there.  It is a Grade 1 closer and has adjustable closing, latching, and back check speeds.  The model we ship also has adjustable spring tension to work on a wider range of doors.  The hole spacing is 3/4” x 9-1/16”.

Older models may be stamped with Scoville or Eaton, which are the companies that used to own Norton.  We sometimes find 20-1624-4001, or 20-1604-4001 stamped on the back of the closer. If your door closer is stamped 20-1603-4001 or 20-1623-4001, you might want to double check the hole spacing. The 20-1603-4001 usually has a hole spacing of 3/4" x 8-3/16", you could use the International Door Closer 853 as a replacement.