A safety chain assembly 24 for securing a towed agricultural vehicle (not shown) to a towing vehicle 21. The safety chain assembly 24 includes a clevis hook 54 having two pin receiving openings 55; a latch member 60 having an attachment opening 62; a spring pin assembly 56, and an elongated load bearing device 36 having a securing opening 37. In the preferred embodiment shown in the drawings the elongated load bearing device 36 is a chain, but it will be appreciated that it could also be a wire rope or other load bearing device having a securing opening 37. Similarly, the preferred spring pin assembly 56 includes a biasing mechanism such as a spring 64 and a washer 66; a retention member 70 and a pin 72; the pin 72 having an annular groove 84, a head 85 and first and second ends 87, 89; the annular groove 84 being located proximate the first end 87 and the head 85 being located proximate the second end 89. The elongated load bearing device 36, preferably the chain 36, and the latch member 60 are interconnected to the clevis hook 54 by the spring pin assembly 56; The retention member is preferably selected from the group consisting of a spring washer and a snap ring and is preferably a snap ring. Methods of attaching and securing the safety chain assembly are also disclosed.