Sterling WorkPro 12.5mm Static Climbing Rope

Sterling WorkPro 12.5mm is a static climbing rope made in the diameter that most arborist friction devices and hitches are designed around. It is a straightforward choice for SRT climbers who want low stretch and a durable sheath.

Why 12.5 mm

Most mechanical devices and many hitch cords are designed with 11.5 to 13 mm rope in mind, and 12.5 mm sits right in that range. That gives you more options when you build or upgrade your SRT kit.

The static build keeps bounce to a minimum on long ascents, and the heavier sheath stands up to repeated base anchors and redirects.

If you are moving from a 1/2 in moving-rope line into SRT, a 12.5 mm static line keeps the same feel in your hand while giving you the low stretch that makes rope walking efficient. It is also a sensible size for a base-anchored SRT line that will be redirected through several unions.

Sterling builds the sheath to take abuse, which helps when the rope runs over rough bark or sits in a basal anchor all day.

Safety and care

Confirm every device in your system lists 12.5 mm as approved. Life-support gear has to meet the applicable standard (ANSI Z133 and the manufacturer's instructions), be inspected before every use, and be used by trained climbers.

Store it in a rope bag, dry and out of the sun. Retire it if you find cuts, core exposure, glazing or stiff sections.

Write the date it went into service on a tag or in a log, so you can track age and use along with what you see during inspection.