How are adjustable shelf pins rated and what gauge should I look for?

Commercial shelf pins are typically 5 mm diameter steel or zinc-plated steel; look for 5 mm x 16 mm pins with a minimum shear rating of 25 lbs. per pin. For heavy-duty shelving (75–150 lbs. per shelf), use four shelf pins per shelf with a 5 mm steel pin rather than plastic. Heavy-duty pin-clip systems with a locking latch are preferred for bookcases in seismic zones. OfficeFurniture2go.com carries properly rated components — call 1-800-460-0858.