Weldless support beam for rack shelving

A shelving system, comprising:

• a first vertical member;
• and
• a shelf support beam, including:
• a unitary member defining:
• a support portion including sheet material extending along an axis from a first end;
• and
• a retention portion disposed at the end of the support portion and defining a base extending congruently with the support portion and at least partially along the axis, the base further extending to a first fold in the unitary member, a reinforcement portion extending oppositely from the first fold along and in contact with at least a portion of the base, a first punched area being defined in an aligned manner through both the base and the reinforcement member of the retention portion;
• wherein the shelf support beam is coupleable with the first vertical member at the retention portion thereof such that the shelf support beam extends perpendicularly from the first vertical member.