You get a hold of a great power rack or squat rack, but then you find out that the company doesn’t make the attachments / accessories that you want.

No problem! You should be able to find a compatible attachment or accessory, as long as your rack is made with one of a few standard configurations.

Compatibility

The key specs are:

  1. The tubing size of the uprights, typically one of: 2″x2″,  2″x3″, or 3″x3″.
  2. The hardware/peg diameter that fits into the holes in the uprights.
  3. The hole spacing in the uprights, ie: the distance between holes on center. This is only an issue for larger attachments that use 2 holes, with a peg and a locking pin. 2″ spacing is becoming the standard. Some racks have Westside spacing, which is 1″ spacing at a certain height range for setting bench press safety bars just right, and otherwise 2″ spacing above and below that.

2020 Update: This guide used to denote the hole size in the uprights. I have changed everything to the peg diameter, which is always a little smaller than the hole size. The peg size is also usually the hardware (bolt) size used on connecting points. There are only a few sizes of pegs used across all brands (1/2″, 5/8″, 3/4″ or 1″), so this gives cleaner numbers and eliminates confusion.

When Slightly Wrong Sized Attachments are Ok

An attachment can fit in a larger hole than it’s made for, but it will be able to wiggle and tip down a little, depending on the bracket that goes over the tubing.

Similarly, attachment brackets can fit onto slightly smaller tubing than what they were designed for. This can be less bad than the wrong peg size, because you can glue shims (UHMW plastic is best) to the inside of the attachment’s bracket to make it fit.

Some attachments work well enough even if they’re loose. Some don’t have enough pressure put on them to make a safety issue, like a rope anchor, but it could still rattle.

The steel gauge (wall thickness) of rack tubing does not factor in. The tubes are fabricated to match the right outside diameter.

When You Should Not Use the Wrong Sized Attachments

I don’t recommend you use certain safety-critical attachments that don’t fit quite right, such as J-hooks, steel safety arms, or plate holders, unless you have a good way of retrofitting it to be snug enough. Use some common sense, visualize it, and you’ll get the idea.

I’ve listed a few brands in some tables. Rogue has among the best and most consistent quality. Cheap Amazon-only brands, which I don’t like to list unless there are no other options, are the worst and might be unsafe. Most other brands are somewhere in the middle.

List of Power Rack Attachments by Size

Not listed here are complex attachments and accessories that will not fit any other racks, such as those that mount on the top or bottom crossmembers or need the rack to be a specific width between uprights. Examples are special pull up bars or rack extensions.

The size categories below are ordered smallest to largest.

2×2 Tubing, 1/2″ Pegs

Rogue Echo / ES-1

Rogue Echo J Cups
$50.00

2×2 Tubing, 5/8″ Pegs

Titan X-2* (discontinued), Powerline PPR1000, Northern Lights Crossbox

* The Titan Fitness X-2 used 50x50mm tubing, which is 1.97″x1.97″. Titan also used 50mm hole spacing. The second hole on their attachments that use two holes (with a hitch pin) will not line up quite right on racks with 2″ hole spacing.

Powerline Landmine Base$24
Powerline Battle Rope Anchor$24
Powerline Weight Horn$20
Rogue Landmine
$100
Also, the Titan T-3 Multi Grip Pull Up Bar is compatible
with the discontinued Titan X-2 rack (thanks TJ!).

2×2 Tubing, 1″ Pegs

Powerline PPR200X / PPR500, Best Fitness BFPR100, Valor BD-7 / BD-33, Rep Fitness PR-1000 / PR-1050 / PR-1100, Fringe Squat Cage, Legend Fitness Varsity Series, Get Rx’d Pro Power Cage, Vanswe Power Rack, TDS 1000lb Power Squat Rack, Fitness Reality 810XLT, Titan Fitness T-2*, Amstaff DF1161A / TP006D (discontinued)

* The Titan Fitness T-2 uses 50x50mm tubing, which is 1.97″x1.97″. Their attachments are generally made large enough that they are compatible with 2×2 tubing.
As of October 2020, the Titan T-2 moved from 50mm (1.98″) hole spacing to 2″ hole spacing, and all their attachments that use 2 holes with a hitch pin were changed to fit. This makes it more compatible with other brands.

Rep Dip Attachment
$79.99
Rep J-Cups Pair
$49.99
Rep Landmine
(fits any rack that will take 5/8″ or larger pegs)
$89.99
Rep Plate Storage Pair
$29.99
Titan Adjustable Monolift$199.99
Titan Safety Straps Pair
fits 26″ inside depth
$129.99
Titan Dip Bars Pair
$69.99
Titan Y-Dip Bar
$79.99
Titan J-Hooks Pair
$49.99
Titan Roller J-Hooks Pair$79.99
Titan Sandwich J-Hooks Pair$74.99
Titan 23″ Spotter Arms Pair
$89.99
Powerline Rope Anchor$24.00

For more on the strap safeties used as an alternative to traditional steel safety bars, see our article, Are Power Rack Safety Straps Safe?

60x60mm (2.36″) Tubing, 1/2″ Pegs

ForceUSA MyRack only.

Although no other brand is directly compatible, these may fit the Bells of Steel racks in the next section well enough.

ForceUSA Plate Holders (4)$49.99
ForceUSA Deluxe J-Hooks Pair$79.99
ForceUSA J-Hooks Pair$49.99
ForceUSA Dip Attachment$79.99
ForceUSA Landmine Base & Handle$79.99
ForceUSA Spotter Arms Pair $99.99
ForceUSA Strap Safeties Pair
fits 29″ inside depth
$99.99
ForceUSA Monolift$199.99

60x60mm (2.36″) Tubing, 5/8″ Pegs

Bells of Steel Residential Rack / Utility Rack / Light Commercial Rack / Brute Rack / Folding Rack / Combo Rack

BoS J-Cups Pair$59.99
BoS Sandwich J-Cups Pair$59.99
BoS Plate Storage Pegs Pair$44.99
BoS Roller J-Cups Pair$69.99
BoS Landmine Base$69.99
BoS Y Dip Bar$99.99
BoS Spotter Arms119.99
BoS Lever Arms$199.99
BoS Monolift$229.99
BoS Belt Squat$308.00

60x60mm (2.36″) Tubing, 1″ Pegs

Powertec WB-PR / P-PR (discontinued), Hulkfit Power Cage

Powertec Premium J-Hooks Pair$65
Powertec Spotter Arms Pair$75
Powertec Landmine$129

2.5×2.5 Tubing, 1″ Pegs

Valor BD-11 / BD-41, Amstaff TR023 / TR025 / SD1050

Valor 12″ Safety Arms MB-H
$65.00
Valor Premium Bar Holders MB-G
$45.00
Valor Dip Handles MB-B
$59.00
Fitness Avenue J-Cups Pair$29.15

2×3 Tubing, 1/2″ Pegs

BodyCraft F430

BodyCraft J-Hooks
$70.00

2×3 Tubing, 5/8″ Pegs

Rogue R-Series (Infinity), FringeSport Kip Cage / 2×3 rigs (discontinued), Bolt Fitness Lightning Power Racks, Titan Fitness T-3* / T-6* (discontinued)

* The Titan Fitness T-3 and discontinued T-6 use 50x75mm tubing, which is 1.97″x2.95″. Their attachments are generally made large enough that they are compatible with 2×3 tubing.

Update 2021: Old versions of the Titan T-3 used 50mm (1.98″) hole spacing. It has been changed to 2″ hole spacing, making other brands using two holes and hitch pin compatible with it. However, I was unable to get Titan to tell me the approximate date or even the year of the change.

Rogue Monolift
with Infinity retrofit kit
$362
Rogue J Cups Pair
$75
Rogue 20″ Spotter Arms$155
Rogue Matador
$100
Rogue Landmine
$100
Rogue Plate Storage
$30
Rogue Battle Rope Anchor
$30
Rogue Wrenches
(15/16″ wrenches fit the head of a 5/8″ bolt)
$25
Fringe 24″ Safety Spotters Pair
$116
Fringe J Cups Pair
$98
Fringe Dip Bar
$104
Titan J-Hooks Pair
$59.99
Titan Sandwich J-Hooks Pair
$79.99
Titan Roller J-Hooks Pair$89.99
Titan Safety Straps Pair
fits 24″ or 36″ inside depth
$109.99
Titan 21″ Spotter Arms Pair$99.99
Titan Adjustable Lever Arms$199.99
Titan Dip Bars Pair 
$54.99
Titan Y-Dip Bar
$89.99
Titan Plate Storage 4-Pack$80.97
Titan Battle Rope Anchor$29.99
Titan Step Up Platform
$69.99

2×3 Tubing, 3/4″ Pegs

Sunny Health & Fitness Power Zone Power Cage

No other brands match this size. If another one does, I’ll list attachments here.

The attachments in the 2×3, 5/8″ peg section above should fit this rack well enough.

2×3 Tubing, 1″ Pegs

Currently only the Fitness Reality X-Class Light Commercial Rack fits this spec.

50x80mm (1.97″x3.15″) Tubing, 5/8″ Pegs

Rep Fitness PR-3000 (discontinued)

3×3 Tubing, 5/8″ Pegs

Rogue Monster Lite, Rep Fitness PR-4000*, Titan X-3*, Body Solid GPR400 / SPR500 / SPR1000**, Vulcan Flat Base Power Rack

* The Titan Fitness and Rep Fitness racks use 75x75mm tubing, which is 2.95″x2.95″, or about 1 millimeter difference. Their attachment brackets are generally made large enough that they are compatible with 3×3 tubing except as noted.

Update 2021: Old versions of the Titan X-3 used 50mm (1.98″) hole spacing. It has been changed to 2″ hole spacing, making other brands using two holes and hitch pin compatible with it. However, I was unable to get Titan to tell me the approximate date or even the year of the change.

Rep still uses metric hole spacing, and it is 50mm/1.98″ instead of 2″. The second hole on their attachments that use two holes (with a hitch pin) will not line up quite right on Rogue and other racks.

** The Body Solid SPR1000 takes 5/8″ pegs facing the front/back, and 3/4″ pegs on the sides. Many of its attachments are made to fit the side holes, which are incompatible with any other racks.

Rogue Adjustable Monolift
$315
Rogue Monster Lite Safety Straps Pair
fits 24″, 30″ or 43″ inside depth
$215
Rogue Monster Lite J-Cups Pair
$90
Rogue Monster Lite Sandwich J-Cups Pair
$150
Rogue 24″ Monster Lite Safety Spotters Pair
$195
Rogue Monster Lite Matador 
 $105
Rogue Monster Lite Storage Channel Pair
$65
Rogue Landmine
$100
Rogue Monster Lite Leg Roller
$85
Rogue Battle Rope Anchor
$30
Rogue MobilityWOD Roller
$50
Rogue Change Plate Storage
$55
Rogue Wrenches
(15/16″ wrench fits head of 5/8″ bolt)
$25.00
Rep Iso Arms (Lever Arms) Pair
fits 50mm hole spacing
$499.99
Rep Monolift
fits 50mm hole spacing
$299
Rep Landmine$89.99
Rep Round Sandwich J Cups$129.99
Rep Flat Sandwich J Cups$95.99
Rep Standard J Cups$69.99
Rep Strap Safeties
(3 length choices to fit any rack)
(reported to not fit well over true 3×3 tubing)
$119.99
Rep 6″ or 12″ Weight Horns Pair
fits 50mm hole spacing
$49.99
Rep Y-Dip Attachment
fits 50mm hole spacing
$119.99
Rep 24″ Spotter Arms Pair$149.99
Rep Front Foot Extension Pair
(pending, looking into it)
Titan J Hooks Pair
(reported to not fit well over true 3×3 tubing)
$59.99
Titan Roller J Hooks Pair$74.99
Titan 24″ Spotter Arms Pair$129.99
Titan Lever Arms$269.99
Titan Dip Bars
$89.99
Titan Safety Straps Pair
fits 24″, 30″ or 36″ inside depth
$139.99
Titan Plate Storage Pair
$39.99
Titan Plate Storage 4-pack $79.99
Titan Battle Rope Anchor$29.99
Titan Wrist Roller$74.99
Titan Muscle Roller$39.99

Mark Buffalo wrote a guide on how to fit the Titan X-3 lat pulldown on a Rogue Monster Lite rack.

3×3 Tubing, 3/4″ Pegs

American Barbell power racks, EliteFTS Collegiate / R3

See the 3×3, 5/8″ section above for more attachments that will fit these racks well enough.

American Barbell Dip Bar
$165
American Barbell Multi Use Pin$27
American Barbell 24″ Safety Spotters Pair$275
American Barbell 42″ Safety Spotters Pair$399
American Barbell Sandwich J Hooks Pair$195
American Barbell Rope Anchor$49
American Barbell Landmine Base$60

3×3 Tubing, 1″ Pegs

Rogue Monster, Vulcan Strength Racks (except Flat Base Power Rack), Ethos Power Rack 1.0, Amstaff 370, Fringe 3×3 rig, Valor rig, Legend Fitness Performance Series, EliteFTS Scholastic Half Racks / Garage Power Racks, Get Rx’d Titan rigs / Goliath rack, Sorinex XL Series, Bolt Fitness Storm Series, XM Fitness 365 Infinity Power Rack, Precor Inspire SCS Power Rack, PRx Pro, Prime Prodigy, eliteFTS Quick Ship Power Rack, Titan’s TITAN Series*, Rep Fitness 5000 Series*, Griffin Fitness GR3*

* The Titan Fitness, Rep Fitness, and Griffin Fitness racks use 75x75mm tubing, which is 2.95″x2.95″. Their attachments are generally made large enough that they are compatible with 3×3 tubing. There have been reports of Titan’s all-steel J-cups and UHMW-lined J-cups not fitting over 3×3 tubing, but their other attachments should fit.

Rep also uses metric hole spacing, and it is 50mm/1.98″ instead of 2″, making them incompatible with most other brands when it comes to attachments that use a second hole and hitch pin.

Update 2021: Old versions of Titan’s TITAN racks used 50mm (1.98″) hole spacing. It has been changed to 2″ hole spacing, making other brands using two holes and hitch pin compatible with it. However, I was unable to get Titan to tell me the approximate date or even the year of the change.

Rogue Adjustable Monolift
$335
Rogue Monster Safety Straps
fits 24″, 30″ or 43″ inside depth
$215
Rogue Monster J-Cups Pair
$135
Rogue Monster Sandwich J Cups Pair
 $250
Rogue 24″ Monster Safety Spotters 2.0 Pair
$315
Rogue Monster Matador 
 $160
Rogue 12.5″ Monster Plate Storage Pin
$45
Rogue 13″ Monster Plate Storage Channel
$100
Rogue Monster Landmine 2.0
$140
Rogue Monster Leg Roller
$115
Rogue Monster Articulating Handle Kit
(lever arms)
$465
Rogue Wrenches
(1.5″ wrench fits head of 1″ bolt)
$25
Rep Monolift$299
Rep Iso Arms (Lever Arms) Pair$499.99
Rep Landmine
(fits any rack that takes 5/8″ or larger pegs)
$89.99
Rep Strap Safeties Pair
fits 30″ or 41″ inside depth
$159.99
Rep 24″ Spotter Arms Pair$209.99
Rep Y-Dip Attachment
fits 50mm hole spacing
$119.00
Rep J-Cups Pair$79.99
Rep Lowered J-Cups Pair$79.99
Rep Flat Sandwich J Cups Pair
$129.99
Rep Rounded Sandwich J Cups Pair$149.99
Griffin Y-Dip Attachment$120
Griffin Flat Sandwich J Cups Pair$125
Griffin Landmine$70
Griffin 24″ Spotter Arms Pair$150
Griffin Safety Straps Pair
fits 30″ inside depth
$145
Griffin 6″ or 12″ Weight Horns Pair
fits 50mm hole spacing
$50
Titan Adjustable Lever Arms$279.99
Titan Lever Arms$249.99
Titan Monolift $319.99
Titan 24″ Spotter Arms$229.99
Titan Y Dip Attachment
$104.99
Titan Sandwich J Hooks Pair
$109.99
Titan Roller J Hooks Pair$119.99
Titan Safety Straps Pair
fits 42″ inside depth
$159.99
Fringe Spotter Arms Pair
$182
Fringe J Cups Pair
$92
Fringe Plate Storage
$88.00
PRx Pro Spotter Arms Pair$175
PRx Pro Dip Station$129

Universal Fit

For a lat pulldown / low row cable system that works on almost any power rack, see the Spud Inc Pulley System shown above.

This Rep Fitness dip attachment above fits on almost any rack with 1″ round safety bars (thanks Anthony!). The rack needs to have at least 21″ depth between the front and back uprights, which is the case for all freestanding racks and most floor-mounted racks except the most shallow ones. The rack’s hole spacing does not matter, as the bottom part of the attachment simply rests against wherever the lower safety bar is.

General Recommendations

For the best compatibility going forward, I highly recommend getting a 3×3 rack taking 5/8″ pegs or 1″ pegs, compatible with Rogue Monster Lite or Monster, respectively. Other companies try to fit those sizes to be compatible.

Rogue appears to be in the beginning stages of abandoning their 2×3 racks in favor of 3×3. Other manufacturers have noticed and likely will follow suit. This doesn’t mean that nobody will make racks with 2×2 or 2×3 tubing. I believe that there will be a market for those lighter and cheaper racks for a long time, and they are not necessarily bad racks. The 3×3 attachments sell much better and are more numerous, because people who spend the extra money for a 3×3 rack are more likely to soup it up.

As mentioned about specific brands in the charts above, steer clear of racks that have metric sized tubing that is not truly 3×3 inches even though that might be what they advertise.