Hydraulic Steel Tube Crimper
Compare TRC hydraulic steel tube crimper models for cutting-ring fitting preassembly by tube OD, wall, material, component system and tooling.
Two current routes | Machine-assisted cutting-ring fitting preassembly
Hydraulic Steel Tube Crimper Selection Starts with the Tube and Fitting System
A hydraulic steel tube crimper in this category is used to assist the preassembly of compatible cutting-ring tube fittings. The machine must be matched to the tube outside diameter, wall thickness, material, cutting ring, nut, fitting body and approved tooling. KT42 and KF42 cover different documented tube ranges, but neither should be selected from tube OD or a pressure number alone.
Send the tube specification, fitting-system reference, nut and cutting-ring details, required presetting instruction and representative samples before model confirmation.
Identify the connection correctly
Cutting-ring fittings are not interchangeable with every compression or flare fitting
A cutting-ring fitting is a flareless connection built around a fitting body, cutting ring and nut. During approved assembly, the ring engages the outside of the tube to create the required hold and sealing interface. Similar-looking metric, 37-degree flare and other compression connections use different geometries and instructions.
ISO 8434-1:2018 provides general and dimensional requirements for 24-degree cone connectors using cutting rings and related seal-cone designs within its scope. It also makes clear that application performance depends on multiple factors and requires sufficient testing and review. The standard does not make every tube, ring, nut, fitting or assembly machine interchangeable.
Name the connection before selecting the machine
Presetting a cutting ring is different from flaring a tube or crimping a hose ferrule
| Connection route | What the operation changes | This category |
|---|---|---|
| Cutting-ring presetting | Drives a specified cutting ring into a prepared rigid tube in a controlled fitting system | Candidate route for KT42/KF42 only after the tube, ring, nut and system data are confirmed |
| Other compression fittings | Compresses an olive, ferrule or seal using the geometry defined by another fitting system | Requires separate system and tooling confirmation; do not assume compatibility |
| Flare fitting | Forms the end of the tube into a flare angle or profile | Not the same operation as cutting-ring presetting |
| Hydraulic hose crimping | Radially forms a ferrule around flexible hose and a hose fitting | Use the hydraulic hose crimper category |
| General swaging or tube end forming | Changes tube or sleeve geometry for a project-specific purpose | Requires application-specific tooling and validation outside a generic cutting-ring claim |
ISO or DIN terminology can describe a fitting family, but it does not certify KT42 or KF42 for every part made to that family. The exact tube, cutting ring, nut, fitting body and assembly instruction remain the controlling system.
Select from the complete component set
Seven inputs are needed before choosing KT42 or KF42
- Tube outside diameter State the metric OD for the smallest and largest tube.
- Wall thickness Record wall thickness for every OD; OD alone does not define the workpiece.
- Tube material and condition Specify carbon steel, stainless steel or other material, condition and surface/coating information.
- Fitting system Provide manufacturer, series, nut, cutting ring, fitting body and applicable assembly instruction.
- Preassembly requirement Identify the required machine-assisted presetting step, tool and inspection condition.
- Part geometry and access Send straight length, bends near the end, shoulders and any feature that affects loading into the tool.
- Production and validation State batch size, size changes, operator method and the required first-off or sample qualification.
Compare documented tube ranges
The narrower or higher-wall route must still match the component system
| модель | Suitable condition | Documented processing range | Key limitation | Why recommend it | Product route |
|---|---|---|---|---|---|
| KT42 | General machine-assisted presetting within the documented tube range | Ø6 × 1 to Ø42 × 4 mm | Material, fitting system, tools and presetting instruction require confirmation | Broad documented OD route with simple operating position in the local product source | /products/6-to-42-mm-hydraulic-steel-tube-crimper-kt42/ |
| KF42 | Projects requiring review of heavier-wall combinations within its documented range | Ø6 × 1 to Ø38 × 6 mm, or Ø42 × 4 mm | The local “650 bar” record is ambiguous and must not be used as a universal connector rating or machine claim | Candidate for the documented heavier-wall range and applications needing a more demanding sealing review | /products/high-pressure-hydraulic-steel-tube-crimper-kf42/ |
KT42D appears in a combined local heading but has no separate current canonical product identity. K142 remains blocked because its record is mixed and unverified. Neither receives a separate public card in this plan.
Follow the responsible fitting instruction
Tube preparation, tooling and inspection control the result together
- Confirm the tube and connector system. Check OD, wall, material, nut, ring and fitting body against the responsible manufacturer data.
- Prepare the tube end. Cut square, deburr and clean using the specified method. Do not copy a plumbing procedure into a hydraulic fitting process.
- Install the components in the correct order and orientation. Follow the component instruction rather than visual memory.
- Load the approved presetting tool. Confirm tool size, condition and machine setting for the exact system.
- Perform machine-assisted preassembly. Keep the tube aligned and follow the specified endpoint or control method.
- Inspect the preset assembly. Check the cutting-ring engagement and other required features using the fitting manufacturer’s inspection method.
- Complete final installation and required validation. Final assembly, tightening and testing remain controlled by the system and application requirements.
Parker’s tube fitting assembly instructions illustrate the need for square cutting, deburring, cleaning, presetting and inspection in a defined fitting system. Use the instructions for their stated Parker components; do not transfer their settings to another system.
Start with the tube end
Presetting cannot correct poor cutting, burrs or an out-of-round tube
| Checkpoint | Review before the operation | Review after the operation |
|---|---|---|
| Tube identity | Material, OD, wall thickness, hardness or condition required by the fitting system | No mix-up between visually similar tube stock |
| Cut end | Square cut and sufficient straight length for the fitting instruction | No new distortion caused by handling |
| Burr and edge condition | Internal and external burrs removed as specified; end cleaned | No loose chips or sharp damage transferred into the fitting |
| Roundness and surface | Tube OD and surface are within the component-system requirement | No collapse, scoring or unintended marking outside the formed zone |
| Cutting ring, nut and body | Correct parts, orientation and size | Ring position and engagement match the responsible fitting instruction |
| Preset location | Tube fully inserted and correctly located in the tool | Required visible or measured inspection evidence is present |
Use a representative first article for every new tube and fitting program. If the cutting ring does not seat as specified, stop and check tube preparation, part identity, tooling and machine setup; do not increase force blindly.
Evidence before production release
Review the actual tube, components, tool and inspected preset assembly
The project evidence should include the tube specification, fitting-system data, selected tool, actual machine configuration, a first-off preassembly and the required inspection record. Photos should show the tube end before assembly, component identity, tool contact and inspected cutting-ring engagement—not only a finished nut from the outside.
For KT42 and KF42, review the tube-and-fitting documents, identified tooling and inspected first-off samples supplied for the specific project. Model-specific machine evidence should be confirmed during the quotation review; a hose crimper or generic pipe image is not a substitute.
Know when this category is relevant
Use the machine for a documented cutting-ring presetting process
| Situation | Page guidance |
|---|---|
| Metric 24-degree cutting-ring system with defined machine presetting tools | Relevant candidate; review tube, ring, nut, fitting and tool as one system. |
| JIC 37-degree flare connection | Different forming and inspection process; do not choose from this category without a verified compatible operation. |
| General plumbing compression fitting | Similar ferrule language does not prove compatibility with hydraulic cutting-ring tooling. |
| Unknown fitting found on existing equipment | Identify tube OD, thread, sealing geometry and manufacturer/series before selecting a machine. |
| Changed tube material or wall thickness | Recheck tool, process and qualification; do not reuse the previous setup automatically. |
Related routes
| Route | Copy | Link |
|---|---|---|
| Hydraulic hose crimping | Use this route when assembling flexible hydraulic hose with a fitting and ferrule. | /product-category/hydraulic-hose-crimper/ |
| Complete equipment range | Compare tube, hose and supporting workshop equipment from the current catalogue. | /products/ |
| Technical review | Send the tube and fitting data for a KT42/KF42 compatibility review. | /contact/ |
Hydraulic Steel Tube Crimper Questions
How do I assemble a cutting-ring or bite-type hydraulic tube fitting without damaging the tube?
Start with the exact fitting manufacturer’s instruction. Use the specified tube OD, wall and material; prepare the end correctly; install the correct nut and ring; use the approved presetting tool; and inspect the ring engagement at the stated stage. Excessive or incorrect assembly can damage the tube or component, while an incomplete preset may not create the required hold.
How can I tell a metric cutting-ring fitting from a JIC flare connection?
Do not identify it from one photograph alone. Record tube OD, thread, sealing geometry, cone/flare angle where applicable and any manufacturer markings. A 37-degree flare and a metric 24-degree cutting-ring system require different components and assembly processes.
Can KT42 or KF42 assemble any 6–42 mm compression fitting?
No. The documented tube range is only an initial capacity boundary. The tube material and wall, fitting body, nut, cutting ring, presetting tool and assembly method must be compatible and reviewed together.
Does a successful machine cycle prove the connection will not leak?
No. The cycle must produce the required preset condition, which then needs the specified inspection, final assembly and any application qualification. Machine movement alone does not establish connector performance.
Can the same setup be used after changing from carbon steel to stainless steel tube?
Do not assume so. Material, tube condition and the fitting manufacturer’s rules can change the permitted components, tools or assembly process. Submit the new material and component system for a fresh review.
Tube fitting application review
Send the complete tube-and-connector system before choosing KT42 or KF42
Provide tube OD, wall thickness and material, fitting body, nut and cutting-ring references, the responsible assembly instruction, batch size and representative samples. TRC will compare the documented KT42 and KF42 ranges and list the tooling or qualification evidence still required.