TNT Hellbox Belt Squat Attachment

Name: TNT Hellbox Belt Squat Attachment
Brand: Porter PhysEd Fitness
Rating: 4.67 (3 reviews)

The TNT Hellbox is Porter PhysEd’s leverage belt squat attachment, built to bolt onto any lever arm with holes through the upright – confirmed compatible with Fringe and PRX rigs in addition to Porter’s own. It offers 5 height settings and 11 angle adjustments so the dual 12” weight horns and 14” knurled handle can be tuned per user and per movement, and owners use it well beyond straight belt squats: calf raises, deadlifts, and modified Viking presses all come up in independent reviews. The design is modular – a base TNT handle can be upgraded into the full Hellbox, and Porter has since released add-on pieces (like the Hell Jammer) that attach into the Hellbox itself, turning it into a small ecosystem rather than a single fixed attachment. Owners are consistently positive on how much it improves the feel of a belt squat setup, with the most repeated nitpick being that the weight horn tubes ship without end caps.

Handle	14" knurled handle
Material	Steel with powder coat finish
Mounting	Slotted holes -- universal fit for lever arms with holes through the upright
Manufacturer	Porter PhysEd Fitness
Weight horns	Dual 12" horns
Product weight	30 lbs
Height settings	5
Angle adjustments	11
Included components	TNT handle, dual weight horns, angle adjuster

What is a Rack Attachment?

What rack attachments are

Rack attachments bolt or pin onto a power rack or squat stand to expand what it can do — J-cups and safety arms/straps (the essentials), plus dip bars, a landmine, a lat pulldown, weight-plate storage, roller J-cups, and more. They turn a rack into a whole gym.

Compatibility comes first

An attachment must match your rack’s upright size (2x2, 2x3, or 3x3) and hole pattern/hardware (e.g. 5/8-in vs 1-in holes, Westside spacing). Attachments are usually series-specific — a Monster Lite J-cup won’t fit an Echo upright — so confirm the fit before buying.

How it compares

	TNT Hellbox Belt Squat Attachment	Monster Landmine 2.0	Multi-Grip Pull Up Bar	Monster Lite Strap Safety System 2.0
GymRadar rating	4.67/5	4.67/5	4.67/5	4.67/5
Price	$250.00	$165.00	$149.00
Handle	14" knurled handle
Material	Steel with powder coat finish		Steel
Mounting	Slotted holes -- universal fit for lever arms with holes through the upright	Tool-less Monster Knurled Knob (no locking feature -- check before dynamic use)
Manufacturer	Porter PhysEd Fitness	Rogue Fitness	FringeSport
Weight horns	Dual 12" horns
Product weight	30 lbs
Height settings	5
Angle adjustments	11
Included components	TNT handle, dual weight horns, angle adjuster

4.7/5 · 3 GymRadar reviews

Reviews by source

Expert

4.67/5

3 reviews

The small pool of independent owners who’ve reviewed the Hellbox on GymRadar are consistently enthusiastic: 4.67/5 across three reviews, with every reviewer calling out versatility as the standout dimension – belt squats, calf raises, deadlifts, and modified Viking presses all get used in practice, not just listed as marketing claims. Build quality also rates well (4.33/5), though the same nit shows up in both the independent reviews and the manufacturer’s own review widget: the weight horn tubes ship without end caps. Value is the softer spot – one reviewer wants a more refined locking pin and angled weight arms before calling the price fully justified. Coverage is thin (three GymRadar reviews, no independent editorial review yet) for a niche attachment from a small manufacturer, and there isn’t yet enough time in the field to speak to long-term durability.

+Versatility: works for belt squats, calf raises, deadlifts, and modified Viking presses, not just its namesake movement (GymRadar owner reviews)
+Functionality: 5 height settings and 11 angle adjustments let owners dial in handle position for their body and the exercise (GymRadar owner reviews)
+Build quality: rated 4.33/5 by independent owners; steel construction with a powder coat finish (GymRadar owner reviews, manufacturer spec sheet)
+Functionality: outboard weight-horn positioning lets owners maximize felt resistance relative to plate weight loaded (GymRadar owner review, Big Josh)

−Build quality: weight horn tubes ship without end caps, flagged as an easy but unfinished-feeling omission by both an independent reviewer and the manufacturer's own review widget
−Value: one reviewer wants a more refined locking pin and angled weight arms (like Fringe's dual horns) before the price feels fully justified (GymRadar, Lightspeed Fitness)
−Durability: too new for long-term wear data -- all independent reviews are from early-to-mid 2026
−Functionality: outboard weight-horn setup requires thinner plates since the knees have to straddle the plates when squatting (GymRadar owner review, Big Josh)

$250.00

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