Single Rivet vs Double Rivet Boltless Shelving Beams: A Capacity Guide for Utah Buyers

Every boltless shelf is a rectangle of four steel beams hooked into four slotted posts, with a deck laid inside the frame. When you load that shelf, the beams carry the weight to the posts. Posts rarely limit a boltless unit in normal use; the beams do. That is why two shelving units that look almost the same from across the room can carry very different loads per level.

Three things decide how much a boltless shelf holds: the beam profile (how tall and how thick the steel is), the span (how far the front and back beams travel between posts), and the deck and its supports (whether anything holds up the middle of the board). Change any one of the three and the published rating changes, sometimes by a factor of two or more.

This guide explains the beam types you will see on quotes and product listings, walks through the manufacturer’s published capacity tables, and ends with a simple way to choose. It is part of our boltless shelving in Salt Lake City resources for Utah buyers.

Light-duty boltless shelving is usually built on single rivet beams. Jaken’s Series 200A low-profile shelving uses them to “maximize available storage space”: because the beam is only 1 inch tall, you lose very little height to steel on each level, so more shelves fit in the same unit and the deck sits nearly flush with the beam.

The ratings reflect the slimmer beam. Standard-duty Series 200A shelves with 1/2 inch particle board are published at 300 pounds per shelf at 36 inches wide, 225 pounds at 48 inches and 150 pounds at 60 inches. That is plenty for office supplies, paperwork, small boxed parts, retail back-stock, clothing and the kind of hand-placed items most supply rooms hold.

Jaken’s heavy-duty Series 200A uses 3/4 inch board and adds single rivet side supports, lifting the ratings to 500, 375 and 250 pounds per shelf at the same three widths. If you like the low profile but your items are denser, that is the first step up before switching beam families.

Once a shelf passes 6 feet wide and the load is heavy, a standard double rivet angle beam runs out of stiffness. That is where channel beams come in. Jaken’s double rivet channel beam keeps the same 2-3/4 inch height but is formed as a channel, in 14 gauge for regular duty and 11 gauge for heavy duty, and is sold in 72 and 96 inch lengths to be used left to right “for greater shelf capacity”.

On a 72 inch Series 200B shelf, the published rating climbs from 600 pounds with particle board alone, to 1,000 pounds with a shelf deck support, to 1,500 pounds with channel beams, and to 2,000 pounds with the heavy-duty package: heavy-duty channel beams, 1-7/8 inch heavy-duty posts and 3/4 inch particle board. The same beam family, correctly specified, covers a more than threefold range at one width.

This is the territory of motors, castings, gearboxes, cased fluids and full cartons of hardware. For more on heavy loads and long spans see our heavy-duty boltless shelving and wide span boltless shelving pages.

A shelf deck support is a steel bar that runs front to back under the middle of the deck. Jaken’s version is 16 gauge, 2-1/2 inches tall and bolts between double rivet or channel beams. It stops the board sagging in the middle and ties the front and back beams together so they share the load, which is why the tables above jump so sharply when a support is added. On wide shelves it is not optional; on 60 and 72 inch shelves it is the cheapest capacity upgrade available.

Deck thickness matters too. Jaken describes 1/2 inch particle board as the standard deck and 3/4 inch board as “ideal for heavy” loads, and its heavy-duty packages specify the thicker board. Wire decks and steel decks change the picture again; our boltless shelving decking options guide compares them, and the LF Illumination project shows wire deck levels added to existing boltless shelving.

Posts come in two sizes. Regular posts are 1-1/2 by 1-1/2 inches and heavy-duty posts 1-7/8 by 1-7/8 inches, both 14 gauge. Heavy-duty posts appear in the top capacity package because a 2,000 pound shelf on every level puts real load into the uprights.

Utah sits in an active seismic region along the Wasatch Front, so tall shelving deserves more thought about stability than it gets in many states. Heavier beams do not make a unit safer on their own; anchoring and connection do. Jaken offers foot plates for anchoring units to the floor and tie plates for joining units into rows, and we can include both on a quote. Your building owner, facility safety staff or local building official decides what anchoring a specific site requires, so ask early.

Two more practical points. First, beam choice affects freight: channel beams and 3/4 inch board are noticeably heavier to ship, which matters on LTL deliveries into sites without a dock. Second, if you are adding to shelving you already own, tell us the brand and beam style. Lyon, for example, sells its own rivet rack beams in light-duty single rivet, medium-duty double rivet and heavy-duty C channel versions, and they are built to fit Lyon posts, not another brand’s.

We quote boltless shelving across Salt Lake City and along the Wasatch Front, freight-only or with boltless shelving installation. Some common sizes are in stock at select manufacturers, subject to confirmation at the time of order. Call our Salt Lake City line at 801-328-8788, or see the statewide Utah boltless shelving overview and our Salt Lake City boltless shelving page. Setting up packing or repair areas too? Boltless workbenches use the same beams and posts.