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Race Car Chassis Roll Cage Kits and Pre-Bent Chromoly Tubing

Make your fabricating job easier with our pre-bent tubing and custom tube bending service

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Pro-Werks 6-point pre-bent 4130N chromoly roll cage tubing kit shown welded together as an example after assembly, six legs off a top hoop Four pre-bent 4130N chromoly tubing pieces from a Pro-Werks 6-point cage kit, two U-shaped hoops and two right-angle bends

Pro-werks 6 Point Pre-Bent Chromoly Cage Kit, 4130N

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Dimensioned drawing of Pro-Werks pre-bent 4130N chromoly steel tubing front hoop, 21.0 in. tall with 17.0 in. between leg centers Pro-Werks pre-bent 4130N chromoly front hoop, 1-1/8 in. x 0.083 tube formed in a U-shaped double bend with straight parallel legs

Pro-werks 6 Point Pre-Bent Chromoly Hoop, 4130N

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Dimensioned drawing of Pro-Werks pre-bent 4130N chromoly tubing back bar, 16 in. tall and 13 in. deep with an 80-degree bend Pro-Werks pre-bent 4130N chromoly back bar, 1-1/8 in. x 0.083 tube with a single 80-degree bend, shown side-on against white

Pro-werks Pre-Bent Chromoly Back Bar, 4130N

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Dimensioned drawing of a Pro-Werks pre-bent 4130N chromoly tubing head bar with a right-angle bend, 6 in. and 18 in. straight legs Two pre-bent 4130N chromoly tubes from Pro-Werks, each with a 90-degree bend and one short leg and one long leg, on white

Pro-werks Pre-Bent Chromoly Head Bar Kit, 4130N

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Close-up of a pair of Pro-Werks pre-bent 4130N chromoly tubing seat bars in bare steel finish, showing the matching bend in each tube Pro-Werks pair of pre-bent 4130N chromoly tubing seat bars, 1-1/4 in. x 0.058 wall with a 20° bend

Pro-werks Pre-Bent Chromoly Seat Bar 4130N, Pair

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Dimensioned drawing of Pro-Werks cage kit tubes: two hoops marked 1 pc. and a bent leg marked 2 pcs., with letter callouts A to F for 4130N chromoly bends

4130N Chromoly Custom Six Point Cage Kit

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Line drawing of a Pro-Werks 4130N chromoly tubing formed with several bends into an S-shaped profile, no dimensions marked

4130N Chromoly Custom Tube Bending

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Cross-section diagram of Pro-Werks 4130N chromoly tubing labeling O.D., I.D. and wall thickness Pro-Werks length of 4130N chromoly round steel tube with dark mill finish, angled to show the cut end, wall thickness and hollow bore

4130N Chromoly Round Tubing

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Pro-Werks copper-coated steel welding filler rods fanned out at an angle across the frame, plain rounded ends visible Loose bundle of long thin Pro-Werks copper-colored steel welding filler rods, fanned out on a white background

Pro-werks #65 Weld Rod, 36 Inches Long

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Pro-Werks 5356 aluminum welding rods, 36 inches long, shown as a loose fanned bundle of bare unwrapped rods Pro-Werks bundle of long, thin bright steel rods fanned out on a white background

Pro-werks 5356 Aluminum Welding Rod, 36 Inches Long

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Open cardboard box packed with assorted tube offcuts, discs and bracket drops in aluminum and 4130N chromoly from Pro-Werks Open cardboard box of Pro-Werks 4130N chromoly tubing drop offcuts, with round and square tubing plus flat bar in mixed lengths

Pro-werks Drop Box, 5 Pounds

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Stack of five Pro-Werks 4130N chromoly steel plates labeled with thicknesses from 1/16 in / 0.063 up to 1/4 in / 0.250 Flat rectangular 4130N chromoly steel plate from Pro-Werks, 12 in x 18 in in 0.063 in thickness, brushed mill finish shown at an angle

4130N Chromoly Steel Plate

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4130N Chromoly Roll Cage Kits & Pre-Bent Tubing — Leave the Bending to Us

Whether you’re building a new race car from scratch or updating your current chassis, The Chassis Shop carries Pro-werks pre-bent 4130N chromoly cage kits and individual tubing components — precision bent and ready for fabrication. Perfect for the professional chassis builder and the serious do-it-yourselfer. Standard kits fit most installations; custom kits are available built to your specifications.

 

6 Point Pre-Bent Chromoly Cage Kits — Standard Packages

Order everything you need with a single part number. Each kit includes a matched set of pre-bent front hoop, intermediate hoop — available in three tube diameter sizes to match your build requirements.

 

Individual Pre-Bent Chromoly Cage Components — Hoops, Bars & Kits

Build your cage your way with individual pre-bent components. All pieces are 4130N normalized chromoly, precision bent to consistent radii and angles. Available in 1-1/8", 1-1/2", and 1-5/8" tube diameters with 0.083" wall thickness.

 

Custom Cage Kits & Custom Tube Bending — Built to Your Specs

Need something beyond a standard kit? The Chassis Shop offers custom bending of 4130 chromoly tubing to your specifications. Minimum basic single bend starts at $50.00 per bend plus material. Complex pieces requiring additional layout time are charged accordingly. Please allow 5–10 business days for scheduling. Tube bending capabilities range from 3/8" to 1-5/8" OD with bend radii from 15/16" to 7".

  • Custom Six Point Cage Kit — Front Hoop, Intermediate Hoop & Back Bar to Your Specs — Pro-werks Custom Six Point Cage Kit — submit your dimensions via the product form for review
  • Custom Tube Bending — Acute, Right Angle, Obtuse, Parallel, Dual Angle & Complex Bends — Pro-werks Custom Tube Bending — 3/8"–1-5/8" OD, submit your bend diagram for review

 

4130 Chromoly Tubing & Plate — Raw Material Stock

The Chassis Shop stocks a large selection of premium 4130N normalized chromoly tubing and plate — meeting or exceeding MIL-T-6736B spec. Available in pre-cut lengths for easy online ordering. Tubing ships in pieces 48" or shorter for maximum shipping cost savings.

  • Round Chromoly Tubing — 31 Size/Wall Combinations, 3/8" to 1-5/8" OD, 12"– 90" Lengths — 4130 Round Chromoly Tubing, Cut to Length — 4130N normalized, MIL-T-6736B spec, TIG/MIG weldable
  • Chromoly Plate — 5 Thicknesses (.063"– .250"), Aircraft Grade AMS-6345-C — 4130 Chromoly Steel Plate — multiple pre-cut sizes, ideal for tabs, brackets & chassis fabrication, Made in USA
  • Drop Box — 5 lbs of Assorted Chromoly or Aluminum Drops — Pro-werks Drop Box — random mix, may contain plate, bar, or round tubing pieces, ideal for practice & small projects

 

Welding Consumables — TIG Filler Rods for Chromoly and Aluminum

Complete your cage build with the right filler rod. Pro-werks offers the same welding consumables trusted by leading chassis builders — compatible with mild steel, chromoly, and aluminum alloys.

  • #65 Triple Deoxidized TIG Filler Rod — Chromoly & Mild Steel, 36" Long — Pro-werks #65 Weld Rod — mild steel to mild steel, chromoly to chromoly, and mild steel to chromoly welds
  • 5356 Aluminum TIG Filler Rod — 36" Long, for 5052 & 6061 Alloys — Pro-werks 5356 Aluminum Welding Rod — suitable for 5052, 6061 aluminum alloys and most castings

 

Material Specs That Matter

All Pro-werks cage tubing is 4130N — normalized chromoly steel, heat treated to condition N for optimal weldability and strength. Key properties:

  • Meets or exceeds MIL-T-6736B specification
  • Compatible with TIG and MIG welding
  • Available in 0.058", 0.065", 0.083", and 0.095" wall thicknesses
  • Tube diameters from 3/8" to 1-5/8" OD
  • Note: Welding should always be performed by a qualified welder.
Questions and Answers

Can I weld Mild Steel to Chromoly Steel?

Yes, it is a very common practice. Mild Steel and 4130N Chromoly Steel can be welded together using the proper welding process and the correct filler rod.

Is 4130N Chromoly Steel stronger than Mild Steel?

Yes. 4130N Chromoly steel has a significantly higher tensile strength than mild steel, making it a preferred material for high-stress components. Ideal for fabrication of suspension, linkage components, and applications where maximum strength-to-weight ratio is required.

Should I sand off the surface scale of metal before welding?

Yes, it is always a good practice to clean any material in the areas to be welded to reduce the potential introduction of impurities from affecting the final strength of the weld.

Do I need to normalize a component or chassis made of 4130N Chromoly Steel after welding?

Some applications may require normalizing while others may not. This is a complex topic and can't be adequately addressed in a short paragraph. Please call our tech team at 800-530-9494 to discuss your specific project.

How do I telescope or slip-fit tubing?

For the best fit when telescoping tubing, select 0.058" wall tubing and slide over tubing with a 1/8" smaller outside diameter (O.D.). 

Example: 1-1/8" x .058" tubing fits over 1" O.D. tubing

Drawing of round tubing sections telescoped together in decreasing diameters

Why does this 4130N Chromoly plate cost more than others?

We offer only high quality Certified Chromoly Plate. We do not make substitutions with other perceived to be similar materials or with off shore look-a-likes that aren't the same quality or strength.

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