E, F & Rotary
 As a member of the Mechanical Committee of the
Standard Coupler Manufacturer's, ASF-Keystone supplies a complete
line of AAR Standard Type E and F couplers. ASF-Keystone E
couplers have been designed with the latest reduced slack features.
In addition, we offer a proprietary Rotary Coupler for coal
service. All ASF-Keystone couplers are made from high strength,
heat treated AAR M201 grade E cast steel. These designs offer
the highest levels of strength and durability.
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