The Titan X-3 uses 3×3″ 11-gauge uprights with 11/16″ holes, Westside spacing on the front and 6″ spacing on the sides. Titan’s own X-3 mag pins are 5/8″ (16 mm), so 5/8″ attachments built for Rogue Monster Lite, REP PR-4000 or Bells of Steel Hydra are the nominal match: their pins are 1/16″ smaller than the hole, about the same gap Titan’s own pins run. No maker promises that cross-brand fit, though. The bigger traps are the 6″ side holes, the split between X-3 Bolt-Down and Flat Foot attachments, and anchoring.
Every spec below comes from Titan’s, Rogue’s, REP’s, Bells of Steel’s and the attachment makers’ own pages, checked October 17, 2026.
Disclosure: links marked “affiliate” go to Amazon, Bulletproof Fitness Equipment or Exponent Edge, whose affiliate programs Hypertrophy Protocol is in. As an Amazon Associate, Hypertrophy Protocol earns from qualifying purchases. If you buy through them, Hypertrophy Protocol may earn a commission at no extra cost to you.
Titan X-3 specs that decide fit
| Spec | X-3 Bolt-Down | X-3 Flat Foot | Why it matters for fit |
|---|---|---|---|
| Upright | 3×3″, 11-gauge | 3×3″, 11-gauge | Same nominal size as Rogue Monster Lite, REP PR-4000 and Bells of Steel Hydra |
| Holes | 11/16″ | 11/16″ | Titan’s own X-3 pins are 5/8″ (16 mm) |
| Front spacing | 2″, with Westside spacing through the bench and clean pull zone | 2″ on the upper and lower uprights, 1″ in the middle | Same idea as the 5/8″ racks below |
| Side spacing | 6″ | 6″ | Side-mounted parts need 6″ spacing or a single hole |
| Height | 80″ or 90″ | 82″ or 91″ | Lat towers and cable parts are height-specific |
| Width | 54″ | 50″ | Overall figures; Titan’s Flat Foot product page lists 42″ inside width |
| Depth | 30″ or 39″ | 48″ | Overall figures; the Flat Foot page lists 30″ inside depth |
| Rated capacity | 1,650 lb rackable; 6,170 lb whole rack | 1,650 lb rackable; 6,170 lb whole rack | Attachments carry their own ratings |
| Anchoring | 3/8″ x 3″ lag bolts or concrete sleeve anchors | Flat-foot base | Several Titan attachments are bolt-down only |
Source: Titan’s X-3 Power Rack Series support page. Titan lists a 24 mm socket for Flat Foot assembly but publishes no millimeter tube size for either version.
Why 11/16″ holes take 5/8″ pins
An 11/16″ hole is 17.46 mm across, and a 5/8″ pin is 15.88 mm, so a 5/8″ pin has about 1.6 mm of room. That’s by design: Titan’s Mag Pins are listed as “5/8″ Mag Pins Fit T-3 and X-3 Series Racks” with a “16mm / 5/8-in.” pin, and the Rack Mounted SquatMax-MD lists a “16mm pin diameter.” So Titan builds its own X-3 attachments around 5/8″-class pins in a larger hole.
That makes a 5/8″ attachment from another brand a reasonable candidate, but not a guarantee. Titan only says its racks are “compatible with a wide range of other power racks with similar dimensions,” without naming any. Pin length, bracket depth and the retention clip still have to work with your rack.
Going the other way, a Titan X-3 attachment’s 16 mm pin is about 0.13 mm larger than a nominal 5/8″ (15.875 mm) hole. Finished holes are usually cut a little over nominal, but no maker here publishes that tolerance, so test the fit before you load it. Anything built for 1″ holes won’t go into an 11/16″ hole at all, and a 5/8″-class Titan pin sits loose in a 1″ hole.
The 5/8″ racks it’s most often compared with line up like this:
| Rack | Holes | Front spacing | Side holes |
|---|---|---|---|
| Titan X-3 | 11/16″ | 2″, Westside in the bench and clean pull zone | 6″ |
| Rogue Monster Lite | 5/8″ hardware | Westside: 1″ through the bench and clean pull area, 2″ above and below | Not stated on the pages checked |
| REP PR-4000 | 5/8″ | 2″, with 1″ in the bench zone | 2″ (REP’s PR-4000 Uprights page) |
| Bells of Steel Hydra | 5/8″ | 2″, with 1″ in the bench and pull zone | 2″ near the top and bottom, 6″ through the middle (72″ and taller) |
Sources: Rogue’s RML-490 page, REP’s rack guide and Bells of Steel’s Hydra upright page. Power rack hole size: 5/8 vs 1 inch covers the two hardware standards in more detail, and Bells of Steel Hydra vs Manticore covers the Hydra side.
The 6″ side-hole rule
Titan lists “6” hole spacing through sides of uprights” on every X-3. Anything that bolts to the side face has to match that pitch or use a single hole. Exponent Edge says the Infinity Arm 2.0 attaches to 1″, 2″, 4″ and 6″ on-center spacing, and it names the X-3 in its compatibility list.
Brand-specific parts are another matter. Rogue’s Monster Lite Matador, for example, is “Compatible ONLY with the Rogue Monster Lite Rig or Rack,” so a matching hole size doesn’t make it an X-3 part. If a side-mount attachment’s page doesn’t name the X-3 or give its hole pitch, ask before ordering.
Bolt-Down vs Flat Foot: Titan’s own exclusions
- Lat Tower (also on Amazon, affiliate): “Fits T-3 & X-3 Series Bolt-Down Power Racks,” and Titan says it “Does NOT fit Flat Foot Power Racks.” It’s 42″ wide overall, rated to 300 lb, and “not compatible with T-3 or X-3 Series Racks purchased prior to October 2021.”
- Y-Dip: fits X-3 racks, rated to 550 lb. Titan’s note: “If your rack isn’t bolted or secured to the ground, use the Y-Dip on the inside of the rack for safe performance.”
- X-Dip Bar (also on Amazon, affiliate): doesn’t use the upright holes at all. It’s “Designed to clip onto your Pin and Pipe Safety Set,” with a clip that fits a 1.8″ pipe, and it’s rated to 440 lb.
- Rack Mounted SquatMax-MD: fits the X-3 and TITAN Series “when mounted to the center of the uprights” and the T-3 when mounted to the side. Titan rates it to 1,000 lb on the belt and 1,300 lb on the loading pin, and its page gives no anchoring rule.
Anthony has used the Rack Mounted SquatMax-MD and wrote about it in the Squat Harness V4 review: clipping the harness to the machine instead of the standard belt made heavy loads easier to handle. As that review notes, a rack-mounted belt squat station puts real off-axis load on the frame, so check how your rack is anchored before you set one up.
Third-party attachments on the X-3
| Attachment | What the maker lists | What to check on an X-3 |
|---|---|---|
| Exponent Edge Infinity Arm 2.0 (affiliate) | Names “Titan X-3 | 3″x3″”; sold in 5/8″ and 1″ versions; attaches to 1″, 2″, 4″ and 6″ on-center spacing | Exponent doesn’t say which version suits 11/16″ holes; 5/8″ is the closer size, so confirm with Exponent |
| Bulletproof VTS (affiliate) | “Works with” list names the Titan X-3 and T-3; “tested with 43″ max inside width” | Measure inside width; it slides over the tops of the posts |
| Bulletproof ISOLATOR 3×3 (affiliate) | 3×3, 2×3 and 2×2 uprights; choice of 1/2″, 5/8″, 3/4″ or 1″ pin | Titan isn’t named; the 5/8″ pin is the closest size |
A listed fit is not a load test. Check the exact pair in the Rack Attachment Fit Checker before you order.
Before you order
- Use 5/8″-class pins. That’s what Titan’s own X-3 hardware uses in the 11/16″ holes.
- Check the mounting face. Side holes are 6″ apart.
- Match your base. Some Titan attachments, like the Lat Tower, are Bolt-Down only.
- Check the purchase date for Titan parts that exclude racks bought before October 2021.
- Measure inside width for spanning attachments like the VTS.
The rack attachment compatibility checklist walks through each check, power rack upright sizes explains nominal tubing, and the Power Rack Comparison Tool puts the X-3 next to other racks. For the two most common 5/8″ racks side by side, see REP PR-4000 vs Rogue Monster Lite.
The verdict
On a Titan X-3, 5/8″ single-hole attachments from Rogue Monster Lite, REP PR-4000 or Bells of Steel Hydra are your best cross-brand bet, because Titan’s own X-3 pins are the same 5/8″ class. Side-mounted parts need 6″ spacing, the Lat Tower needs a Bolt-Down X-3 bought in or after October 2021, and 1″ attachments won’t fit at all. Taking X-3 attachments to another rack is less certain, since a 16 mm pin is a hair over a nominal 5/8″ hole.
Specifications checked against manufacturer pages on October 17, 2026. Manufacturers change specs; confirm on the product page before ordering.
For Titan’s own rack lines side by side, see Titan X-3 vs T-3 vs T-2: which attachments fit.