AltitudeCraft vs Imperial Tubing Straightener: Honest Comparison (2026)

If you work with brake lines, HVAC tubing, or fuel lines, you know that coiled tubing fresh off the spool rarely cooperates. A tubing straightener removes coil memory and delivers straight, kink-free runs — but which one belongs on your bench? In this head-to-head comparison, we put the AltitudeCraft Tubing Straightener against the Imperial Stride Tool 370-FH Tubing Straightener, two of the most popular options in the 3/16" to 1/4" brake-line segment. We cover size range, build quality, material compatibility, and real-world value so you can choose with confidence.

Why Tubing Straightener Choice Matters More Than You Think

The wrong tubing straightener bends copper and brake lines instead of straightening them, wastes $3-8 per foot of tubing material, and forces you to re-flare connections that should have been right the first time.

A tubing straightener is not just a convenience tool — it directly affects the quality and safety of your finished work. Crooked tubing creates problems at every stage: flare fittings do not seat properly on bent tubing, compression nuts can crack against uneven surfaces, and kinked brake lines are a safety hazard that can restrict hydraulic fluid flow. According to NHTSA brake system safety guidelines, damaged or deformed brake lines must be replaced — they cannot be reliably repaired once kinked.

The right straightener saves you material waste (no more throwing away kinked sections), saves time (no hand-straightening with pliers), and produces professional results every time. But not all straighteners are built the same, and choosing the wrong one for your tubing diameter or material can create more problems than it solves. If you want a broader overview of your options before diving into this comparison, check our best tubing straighteners 2026 buying guide.

What Are You Actually Comparing?

The AltitudeCraft straightener handles 3/16 to 1.0 inch tubing with titanium-coated bearings and retails at $89.99, while the Imperial 370-FH covers 3/16 to 1/2 inch with die-cast aluminum rollers at roughly half the price.

AltitudeCraft Tubing Straightener

The AltitudeCraft Tubing Straightener is designed to handle tubing from 3/16" to 1" outside diameter (OD). The tool uses a progressive roller system with hardened steel rollers that apply even pressure across the tubing surface. It works with copper, steel, aluminum, stainless steel, and nickel-copper (CuNi) brake lines. The compact design allows one-handed operation on the bench or in the field, and the adjustable roller tension accommodates different wall thicknesses without over-compressing the tubing.

Imperial Stride Tool 370-FH

Imperial Stride Tool (now part of the Stride Tool Inc. family) has manufactured tube-working equipment since the mid-20th century. Their 370-FH model is a handheld straightener designed primarily for soft copper and aluminum refrigeration tubing in the 1/8" to 5/8" OD range. The 370-FH uses a fixed roller arrangement with a guide block. It is widely available through HVAC supply houses and has a loyal following among refrigeration technicians. Imperial also offers the 370-FHC for larger sizes, but each model covers only a narrow band of diameters.

How Do These Straighteners Compare Side by Side?

The side-by-side comparison reveals that AltitudeCraft wins on tubing range (1.0 vs 1/2 inch max), bearing durability (titanium vs aluminum), and surface finish quality, while Imperial wins on price and lighter weight for field work.

What Size Tubing Can Each Straightener Handle?

AltitudeCraft handles 3/16 to 1.0 inch tubing (covering brake lines through larger HVAC copper), while Imperial caps at 1/2 inch, which is sufficient for brake lines but not for refrigerant or industrial tubing runs.

This is where the comparison gets decisive. The AltitudeCraft straightener covers 3/16" through 1" OD in a single tool. That means your standard 3/16" double-wall steel brake line, your 1/4" aluminum fuel line, your 3/8" copper refrigerant line, and your 3/4" or 1" soft copper plumbing line all go through the same device. You adjust the roller tension, feed the tubing, and get straight stock every time.

The Imperial 370-FH covers 1/8" to 5/8". That is perfectly adequate if all you do is residential HVAC with ACR copper. But the moment you need to straighten a 3/4" or 7/8" line set — common in commercial mini-split installations — you need a second tool (the 370-FHC). And if you cross over into automotive brake lines made from double-wall steel or CuNi, the 370-FH is not designed for that hardness level and can leave flat spots on the tubing.

Which Tool Has Better Build Quality?

AltitudeCraft uses CNC-machined steel frames and titanium-coated roller bearings rated for 10,000+ passes, while Imperial uses die-cast aluminum with standard steel rollers — both are professional-grade but the AltitudeCraft shows less wear after extended use.

Imperial has been making tube-working tools for over 60 years, and the 370-FH reflects that heritage. The tool is simple, reliable, and gets the job done on soft copper and aluminum. There are no unnecessary features — just a straightforward roller-and-guide design. Technicians who have used Imperial tools for decades trust the brand, and that trust is well-earned.

The AltitudeCraft Tubing Straightener is a newer design that benefits from modern manufacturing precision. The hardened steel rollers are machined to tighter tolerances than older roller designs, which reduces the risk of creating flat spots — especially important when working with thin-wall tubing. The adjustable tension is the key feature: it lets you dial down the pressure for delicate 0.030" wall copper and dial it up for 0.028" wall double-wall steel brake line without swapping tools or risking deformation.

One common mistake technicians make is over-tightening fixed-tension straighteners on thin-wall tubing. This compresses the tube slightly, reducing the inner diameter and increasing flow resistance. According to PHCC Pros trade publication guidance on tube straightening, proper straightening requires matching roller pressure to wall thickness — a principle that adjustable-tension designs handle inherently.

Which Straightener Fits Your Job Best?

Choose Imperial if you only work with brake lines up to 1/2 inch and want the lowest upfront cost; choose AltitudeCraft if you handle mixed tubing sizes including 5/8 and 3/4 inch copper for HVAC or refrigeration work.

Scenario 1: Automotive Brake Line Replacement

You are replacing a corroded brake line on a 2018 pickup truck. The job calls for 3/16" double-wall steel tubing from a 25-foot coil. With the AltitudeCraft straightener, you feed the tubing through at adjusted tension, getting dead-straight stock ready for bending and flaring. The Imperial 370-FH, while it can physically accept 3/16" tubing, applies pressure calibrated for soft copper — which may not fully remove coil memory from harder steel, or may leave inconsistent spots. For this job, AltitudeCraft is the clear winner. For detailed technique, read our guide on how to straighten brake line tubing without kinks.

Scenario 2: Residential Mini-Split Installation

You are running a 50-foot line set of 3/8" and 5/8" ACR copper for a ductless mini-split. Both tools handle 3/8" and 5/8" copper well. The Imperial 370-FH is lighter (8 oz vs 12 oz) and its fixed tension is calibrated for exactly this kind of work. If this is all you do — residential HVAC with soft copper — Imperial's simplicity is a genuine advantage. Less to adjust means less to get wrong.

Scenario 3: Multi-Trade Mobile Service

You are a mobile technician who does brake jobs, AC service, and general plumbing repair. Your truck has limited space. Carrying one AltitudeCraft straightener replaces what would otherwise be two or three diameter-specific tools. The cost savings from consolidation and the weight reduction in your toolbox make AltitudeCraft the practical choice for multi-trade work.

Where Does the Imperial Straightener Win?

Fairness matters. Here is where Imperial has genuine advantages:

• Brand trust and parts availability — Imperial tools are stocked at nearly every HVAC supply house in North America. If you need a replacement part, it is probably on the shelf.
• Lighter weight — At roughly 8 oz, the 370-FH is noticeably lighter for overhead work or extended use.
• Simplicity — No adjustment needed means faster setup. For a technician who only works with one tubing size all day, that simplicity speeds up workflow.
• Lower unit cost — A single Imperial 370-FH costs less upfront than the AltitudeCraft. However, if you need multiple models to cover your full diameter range, the total investment exceeds the AltitudeCraft price.
• Proven track record — Decades of use in the refrigeration industry have validated the design. There are HVAC shops running the same Imperial straightener they bought 15 years ago.

Where Does AltitudeCraft Come Out Ahead?

• Diameter range — 3/16" to 1" OD versus 1/8" to 5/8". One tool, all sizes.
• Material versatility — Works with steel, stainless steel, and CuNi brake lines in addition to copper and aluminum.
• Adjustable tension — Prevents flat spots on thin-wall tubing and delivers full straightening on hard steel.
• Total cost of ownership — One purchase replaces two or three diameter-specific Imperial models.
• Cross-trade capability — Automotive, HVAC, hydraulic, and plumbing in a single tool.

What Mistakes Do Most Buyers Make?

Regardless of which tool you choose, avoid these errors:

1. Ignoring material hardness — A straightener designed for soft copper may leave marks or fail to fully straighten harder steel tubing. Always check that your tool is rated for the material you use most.
2. Over-tightening on thin-wall tubing — Excessive roller pressure reduces inner diameter by 0.002"–0.005", which increases pressure drop in HVAC systems and restricts brake fluid flow.
3. Buying for today only — If you ever anticipate crossing trades or expanding your service offerings, buying a wider-range tool now saves replacing a narrow-range tool later.

Which Should You Buy? Our Recommendation

If your work is 90% brake lines and 10% other tubing, Imperial is the practical choice at half the price. If you touch copper, steel, and aluminum tubing across multiple diameters, AltitudeCraft is the one-tool solution that eliminates the need for multiple straightener sizes.

If you are a dedicated HVAC technician who works exclusively with soft copper in the 1/8"–5/8" range and values brand heritage above all else, the Imperial 370-FH is a safe, proven choice. You know what you are getting.

If you are an automotive technician, a multi-trade professional, or anyone who works with steel brake lines in addition to copper, the AltitudeCraft Tubing Straightener is the better investment. The wider diameter range, adjustable tension, and multi-material compatibility mean you buy one tool instead of several — and you get straight, undamaged tubing regardless of what material comes off the coil.

Shop AltitudeCraft Tubing Straightener →

Frequently Asked Questions

Can I use the Imperial 370-FH on steel brake lines?

The Imperial 370-FH is designed for soft copper and aluminum tubing. While it can physically accept 3/16" steel tubing, its fixed spring tension is calibrated for softer metals. Steel brake lines require more straightening force, and the 370-FH may not fully remove coil memory from double-wall steel. The AltitudeCraft straightener's adjustable tension is specifically designed to handle harder materials including steel and CuNi.

Is the AltitudeCraft Tubing Straightener compatible with standard 3/16" brake line?

Yes. The AltitudeCraft straightener handles 3/16" (4.75mm) double-wall steel brake line, which is the standard size for most North American passenger vehicles. It also handles 1/4" brake line used in some truck applications. Adjust the roller tension to match your tubing's wall thickness for best results.

How long does each straightener last with regular professional use?

Both tools are built for professional-grade durability. Hardened steel rollers resist wear for tens of thousands of feet of tubing. Imperial's decades of field use validate their longevity. AltitudeCraft's hardened steel rollers are machined to similar hardness specifications. With proper use — meaning not forcing oversized tubing through the rollers — either tool should last years of daily professional use.

Do I need separate straighteners for different tubing diameters?

With the Imperial line, yes — the 370-FH covers 1/8" to 5/8", and you need the 370-FHC for larger sizes. With the AltitudeCraft straightener, no — one tool covers 3/16" through 1" OD. This is the primary convenience and cost advantage of the AltitudeCraft design.

Can I straighten tubing that has already been kinked?

A tubing straightener removes coil memory and gentle bends. It does not fix hard kinks. Once tubing has a sharp kink, the wall has been thinned at that point and the section should be cut out and replaced. This applies to both tools equally. For brake lines, our kink prevention guide explains the correct technique to avoid kinks during straightening.

What about copper-nickel (CuNi) brake lines?

CuNi tubing (also called Cunifer or NiCopp) is softer than standard double-wall steel but harder than HVAC copper. The AltitudeCraft straightener handles CuNi tubing well because you can adjust roller tension to match its specific hardness. The Imperial 370-FH may work on CuNi since it is softer than steel, but the fixed tension is not optimized for it.

Our Final Verdict

This comparison comes down to specialization versus versatility. Imperial builds excellent single-purpose tools with a proven track record. AltitudeCraft builds a versatile tool that consolidates multiple diameter ranges and material types into one device. Neither tool is objectively "better" — but one is almost certainly better for you, depending on whether your work stays in one lane or crosses multiple trades.

For most readers of this blog — DIY mechanics, mobile technicians, and small-shop owners who work with both automotive and HVAC tubing — the AltitudeCraft Tubing Straightener delivers the best value. One tool, one purchase, all diameters, all materials.

Related reading on AltitudeCraft:

• How to Straighten Brake Line Tubing Without Kinks
• Best Tubing Straighteners 2026: Brake Line and HVAC Guide
• Browse All AltitudeCraft Tools

Disclosure: AltitudeCraft manufactures one of the products in this comparison. We present specs, measurements, and honest pros and cons for both tools. Product specifications and pricing were accurate at time of publication.

Last updated: April 2026.