Rack Upright Hole Spacing and Steel Gauge Chart

Four numbers decide whether an attachment fits your rack, and all four are on this page. Hole spacing is 1 inch, 2 inches, or Westside, which is 1 inch through the bench zone and 2 inches above it. Hole diameter is 5/8 inch on most home racks and 1 inch on the heaviest frames. Uprights are 2x2, 2x3 or 3x3 inches. And steel gauge runs backwards, so 11 gauge at 0.120 inch is thicker than 14 gauge at 0.075 inch.

Hole spacing is the centre-to-centre distance between two adjacent holes in a rack upright. That single measurement does two jobs. It sets how finely you can position a J-hook, a safety bar or a set of spotter arms, which is a safety question. And together with hole diameter and tube size it decides which accessories will physically bolt onto the frame, which is a money question, because attachments cost more than most people expect and a rack you cannot add to is a rack you eventually replace.

The EVERYMATE spotter arms above are the clearest example of why this chart exists. They are built for 2x2 inch uprights with 5/8 inch holes. On a 3x3 inch frame or a rack with 1 inch holes they do not fit, and there is no adapter that makes them safe. Arms that almost fit are arms that do not fit, and this is a load-bearing part you fall onto.

What does steel gauge actually mean in wall thickness?

Gauge is a sheet steel thickness scale where the number runs backwards: the smaller the gauge number, the thicker the steel. It is the single most quoted specification in rack marketing and the least intuitive, because 11 gauge sounds worse than 14 gauge to anyone who has not learned the scale. Wall thickness is what the gauge number is really telling you, and thickness is what resists the wall of the tube deforming around a loaded pin.

The gauge figures below are the standard sheet steel thicknesses that rack manufacturers quote. Actual tube walls vary slightly with the mill and the finish, and some manufacturers publish a decimal thickness instead of a gauge for exactly that reason. Where a listing gives you a decimal, trust the decimal over the gauge name.

Gauge alone does not rank racks, and it is worth saying that plainly because it is the number people fixate on. A 3x3 inch upright in 11 gauge has a far larger cross section than a 2x2 inch upright in the same gauge, and cross section matters at least as much as wall thickness for resisting the bending load a rack sees when a bar is racked hard. A wide-footprint 12 gauge frame that is bolted to a slab can easily be steadier in use than an unanchored 11 gauge frame with a narrow base. Read gauge, tube size and anchoring together or you will read all three wrong.

What are the standard hole spacings, and which should you want?

There are effectively three patterns in the market, and one of them is a hybrid of the other two. They do not affect strength much. They affect whether a safety bar can be put exactly where it needs to be.

Westside spacing means 1 inch holes through the bench press and pulling zone, typically the lower 30 to 50 inches of the upright depending on the manufacturer, and 2 inch spacing above it. The pattern is named after Westside Barbell, where it became standard practice, and it exists because the fine adjustment is only genuinely needed in one part of the rack. Drilling an entire upright at 1 inch intervals removes a lot of steel from a structural tube for adjustment resolution you will never use at shoulder height.

Why does the bench zone get 1 inch spacing?

Because a 2 inch gap is enough to make a safety bar useless on a bench press, and this is the one place on a rack where being an inch off has consequences. The safety needs to sit just below the lowest point of the bar path, close enough that a failed rep is caught almost immediately, and far enough below that a good rep touches your chest without clanging into steel.

Work it in real numbers. On a bench with a 17 inch pad, a lifter of average chest depth has the bar at roughly 26 inches off the floor at the bottom of the press. The safety wants to be around 25 inches, one inch below the touch point. With 1 inch spacing there is a hole at 25 and the problem is solved. With 2 inch spacing the holes might fall at 24 and 26, and both are wrong.

Read the 24 inch row carefully, because that is the honest cost of 2 inch spacing rather than a scare story. A safety two inches below the touch point still catches the bar. It just catches it after the bar has already settled onto your ribcage, which means you have to slide out from under a loaded bar rather than simply letting it go. Whether that is acceptable depends on the load, on your chest depth and on whether anyone else is in the house. It is exactly the calculation you should not have to make, which is why 1 inch spacing in the bench zone is worth paying for.

Two practical notes that apply regardless of spacing. Always set the safeties with an empty bar before you load anything: lie down, run the bar to your chest, and confirm the clearance with your own body rather than a chart. And check the safeties again if you change bench, because a 17 inch pad and a 19 inch pad move the whole calculation by two inches. Our guide to choosing a power rack covers the safety types themselves, and the half rack versus full power rack comparison covers what changes when there are only two uprights behind you.

Which rack ecosystems actually interchange?

An ecosystem here means a family of racks that share tube size, hole diameter and hole spacing closely enough that attachments move between them. Ecosystems are the real reason to care about these numbers, because a rack is the one purchase in a home gym that you add to for years rather than replace.

The table below describes widely used conventions, not guaranteed fits. Every figure in it is the pattern a series is generally built to, and manufacturers revise dimensions, run production changes mid-series and sell regional variants. Treat it as a shortlist for what to check, then measure your own uprights before you spend money. Nobody, including a manufacturer's own compatibility page, can tell you the dimensions of the specific rack standing in your garage.

Three patterns fall out of that table and they are more useful than any individual row. First, 3x3 inch uprights with 5/8 inch holes and Westside spacing is the closest thing the industry has to a shared standard, and buying into it gives you the widest choice of third-party attachments. Second, 2x3 inch with 5/8 inch holes is the dominant home pattern one tier down and is also well served. Third, 2x2 inch with 5/8 inch holes is where the budget market lives, and it is served almost entirely by generic attachments rather than brand ones.

The exception that proves the point is a first-party accessory built for one frame. A REP lat pulldown and low row attachment for 1000 series racks bolts to a REP PR-1100 and to essentially nothing else, and on that rack it is the best cost per useful exercise available. That is ecosystem lock-in working in your favour: it exists because the manufacturer knew the exact upright it was bolting to. The same logic is why buying a rack purely on price is a decision you make once and pay for repeatedly.

How do you measure your own uprights before buying anything?

Three measurements, taken from the rack itself rather than from a listing, settle almost every compatibility question. Do them once, photograph the numbers, and keep the photo on your phone with your other build measurements.

• Tube outside dimensions. Measure the outside of the upright front to back and side to side, with a tape or calipers. You are looking for 2 x 2, 2 x 3 or 3 x 3 inches nominal. Measure the tube itself, not a bracket or a bolted-on plate, and take the reading somewhere without a weld seam.
• Hole diameter. Measure across the widest point of a single hole. You are separating 5/8 inch, which is 0.625 inches, from 1 inch. Calipers make this trivial. If you only have a tape, a 5/8 inch hole comfortably passes a 5/8 inch bolt and will not accept a 3/4 inch one, which is a quick sanity check with hardware you probably already own.
• Centre-to-centre spacing, in two places. Measure between two adjacent hole centres low on the upright, in the bench zone, and again above shoulder height. This is the step most people skip, and it is the one that catches a Westside upright: 1 inch low, 2 inches high. An easier version is to measure across several holes and divide, which averages out your own error, so five gaps spanning 10 inches means 2 inch spacing.

Two more checks are worth thirty seconds each. Count the holes and note where the numbering starts, because attachment instructions frequently say things like "pin at hole 9 from the bottom" and racks do not all start counting from the same place. And check whether the holes are round or slotted, because some safety systems use a slot or a keyhole rather than a plain round hole, and those never accept a generic pin.

Does hole spacing matter on a squat stand or a folding rack?

Less than on a cage, and for a specific reason: the attachments that most need fine adjustment are the ones a two-upright frame cannot take. A squat stand has no safety pins running front to back, so the 1 inch bench zone argument mostly evaporates. What it has instead is J-hooks, which need adjustment to about an inch for a squat, and bolt-on spotter arms, which need it far more.

If you are squatting or benching alone off a stand, spotter arms are not an accessory, they are the safety system, and their fit is the whole question. The Titan T-3 73.5 inch squat stand uses the T-3 pattern, which is 2x3 inch uprights with 5/8 inch holes, so it takes the same arms and hooks as the rest of that family. That is the practical benefit of buying into a pattern rather than a price: a short stand bought for a 7 foot basement can still be fed from a large accessory catalogue years later.

Folding wall mounted racks add a fourth variable, which is the wall. A folding wall mounted power rack in 2x3 inch 11 gauge is a real rack when it is open, but everything it can do depends on the studs or masonry behind it and the fasteners going into them, not on the tube in front of it. Hole spacing still decides which J-hooks and arms fit, and the wall still decides whether any of it is safe. Our power rack picks and the rack spec pages list tube size, hole diameter and spacing for each option so you can shop by pattern rather than by photograph.

How to read a rack listing without getting caught out

Rack listings are written by marketing departments and they omit the same four things consistently. Here is what to look for, and what to assume when it is missing.

• If the gauge is not stated, assume it is thin. Manufacturers who use 11 gauge say so in the first line, because it is the number that justifies the price. A listing that leads with a load rating and never mentions gauge or wall thickness is usually 14 or 16 gauge.
• If hole spacing is not stated, assume 2 inches throughout. Westside spacing is a selling point and gets advertised. Uniform 2 inch spacing is not, and it is the default on budget frames.
• If hole diameter is not stated, assume 5/8 inch. This is usually right, since 1 inch hardware is a premium feature that gets called out. Confirm it before you buy an attachment, not after.
• Treat the load rating as a published figure, not a design margin. Ratings are measured statically under the manufacturer's own conditions. Racking a bar hard, unracking unevenly and dropping a failed lift onto safeties are all dynamic events that a static rating does not describe.

One last item that has nothing to do with holes and everything to do with whether the rack works. Anchoring is what turns a light frame into a stable one, and it is specified by the rack manufacturer rather than chosen by you. Half inch wedge anchors are the common slab specification, and embedment depth rather than bolt length is what carries the load, so read the rack manual before buying a length. A bolted 14 gauge rack behaves better than an unbolted 11 gauge one, which is the one place in this entire chart where a number can be beaten by a decision.

Related charts, tools and guides

• How to choose a power rack, tube, gauge, safeties and footprint together
• Best power racks, with tube size and hole pattern listed for each
• Half rack vs full power rack, what changes when there is nothing behind you
• Anchoring a rack safely, slab, fasteners and embedment depth
• Rack spec pages, individual racks with their published dimensions
• All home gym spec charts, bar specs, plate diameters and ceiling clearances