A code such as 92/32, 90/22, CM80 or 40KK is a useful search key. It is not a manufacturing drawing. Use it to find the right machine family, then verify the dimensions and interfaces that decide whether the replacement will fit.
The current EJS website lists parallel twin screw barrel work under codes that look very different from one another. Some are plain diameter references, some combine letters and numbers, and some use a slash. That mixed list is valuable because it reflects the identifiers buyers actually bring to a replacement inquiry. It also exposes the central risk: similar-looking codes do not necessarily follow one naming rule.
This guide does not invent a universal decoder. It shows what the published EJS code list can establish, what it cannot establish, and what evidence closes the gap before steel is cut.
Start with the current EJS code inventory
The EJS parallel twin screw barrel category currently names the following examples: 40KK, Ø45, CM58, 67/22, 68/25, CM80, 114/32, 92/28, 92/32, 90/16, 90/22, 75/32, 81/17 and Ø250. The EJS extruder barrels page gives the same named set and also presents a diameter-style range as Ø45/2 to Ø250/2.
The category page repeats 114/32. The table below removes that duplicate only to make the lookup list readable. It does not alter or reinterpret any engineering designation.
| Published format | EJS examples | Safe use at inquiry stage | Do not infer without evidence |
|---|---|---|---|
| Diameter-style | Ø45, Ø250, and the barrel-page notation Ø45/2 to Ø250/2 | Use as a first filter for the nominal product size and twin-bore context. | Exact bore geometry, center distance, screw outside diameter, working clearance or total length. |
| Letter-number family | 40KK, CM58, CM80 | Preserve the letters and number as one identifier. Match it to the maker, model and documents. | That the number alone equals a measured diameter, or that two brands use the letters in the same way. |
| Slash-style family | 67/22, 68/25, 75/32, 81/17, 90/16, 90/22, 92/28, 92/32, 114/32 | Use the complete pair to locate the probable series and processing-unit record. | That the first number is always one exact diameter and the second is always one universal ratio. |
Why one universal decoding rule will fail
A buyer often sees a code such as 90/32 and reads the first number as screw diameter and the second as L/D. That reading can be correct inside a documented machine series. It is not safe as a blanket rule for every code on a mixed replacement list.
Current OEM literature illustrates why the source matters. KraussMaffei describes its counter-rotating KMD portfolio by 36D, 32D and 26D process-length series. Its profile-extrusion page gives an example configuration of a parallel 90 mm unit with 32 L/D. An official KraussMaffei brochure uses the fuller designation KMD 90-32/P. Battenfeld-cincinnati, by contrast, uses the twinEX family name and an official case describes a twinEX 93-34 parallel twin screw extruder.
Those examples show that a number pair becomes meaningful only when attached to its maker and series. Punctuation also changes between records: one source may use a slash, another a hyphen, and another may print the ratio with the letter D. A replacement inquiry should preserve the original form and add the source document, not normalize the code from memory.
EJS states that its parallel replacement hardware serves KraussMaffei, battenfeld-cincinnati and Theysohn extruders. EJS is presented here as an independent replacement manufacturer, not as the original equipment manufacturer or an authorized affiliate of those brands. Exact compatibility remains a part-specific engineering check.
Close-looking codes are a warning, not proof of interchangeability
The EJS list contains two pairs that make the risk visible: 90/16 and 90/22, plus 92/28 and 92/32. If the first number were enough to order a part, the second number would have no reason to exist. Keep the complete code and treat each pair as a separate record until drawings prove otherwise.
| Comparison | What the website establishes | What must be checked before quoting |
|---|---|---|
| 90/16 vs 90/22 | EJS lists them separately. | OEM, complete model, process length, screw geometry, barrel zoning, drive end and flange interfaces. |
| 92/28 vs 92/32 | EJS lists both as parallel twin screw barrel examples. | Whether the suffix denotes process length in that exact source, plus every manufactured dimension. |
| CM58 vs CM80 | Both appear as letter-number identifiers. | The machine family behind CM, nominal size convention, generation, serial range and drawing revision. |
| Ø45 vs Ø45/2 | Both forms appear across EJS pages. | Whether the record describes screw size, each barrel bore, the two-bore assembly or a catalogue grouping. |
Do not convert punctuation during the first exchange. A photo of KMD 90-32/P should not be typed into an RFQ as only 90/32. The missing KMD and P can carry the context that prevents the wrong archive drawing from being selected.
Read published size ranges as page scope, not a part promise
The current EJS Twin Parallel Screw Barrel product page publishes an available bore diameter of 25 to 220. The parallel category also names Ø250, while the extruder barrel page writes its parallel twin cylinder range as Ø45/2 to Ø250/2.
These statements sit on pages with different scope and notation. The careful reading is not to choose the largest range and promise every construction within it. The careful reading is to say that EJS publishes parallel twin screw barrel experience across a broad size span, while the manufacturability of one screw, one barrel or one complete assembly must be confirmed against its drawing, material, treatment and length.
Scope also changes with what the buyer is replacing. A screw pair, bare barrel, lined barrel, feed throat and flange assembly can share a machine code but require different manufacturing inputs. EJS states on its extruder barrels page that it can produce feed throats and flanges as an assembly and perform a leakage test on that assembly. That is relevant only when the quotation clearly includes those components and the required test.
Convert the code into a drawing-level verification
A useful identification process has two gates. Gate one finds the probable machine family. Gate two confirms the actual part. Do not release production after gate one.
| Verification field | Best evidence | Why the code cannot replace it |
|---|---|---|
| Machine identity | Nameplate photo, full model, serial number, year and original manual page. | One code can survive across generations or be copied into an incomplete maintenance record. |
| Screw pair | Overall and working length, outside diameter, center distance, helix and section geometry, rotation, timing marks and drive ends. | The code does not reproduce the working profile or the gearbox connection. |
| Barrel bores | Both bore diameters, center distance, straightness, wear map and measurement positions. | A nominal size is not the finished bore geometry or the allowable working clearance. |
| Barrel interfaces | Flange outline, register, bolt pattern, inlet, outlet, vent, sensor, heating and cooling positions. | Machines with related processing sizes can use different housings and connection layouts. |
| Material system | Base steel, heat treatment, working-surface material, hardness requirement and certificates. | Material and treatment are purchasing choices, not reliably encoded in the size name. |
| Process duty | Polymer, formulation, filler, regrind, output, screw speed, torque, temperature and wear history. | The same machine family can run duties with different abrasion, corrosion and thermal loads. |
| Acceptance | Approved drawing, critical-dimension list, inspection method, report format and document requirements. | A matching label does not prove the delivered part matches the purchase specification. |
If an original drawing is unavailable, do not turn a worn screw or barrel into an unquestioned master. Mark the worn zones, measure at several axial positions and identify surfaces that are still likely to represent the original geometry. The EJS custom screw barrel manufacturing guide gives a fuller field-measurement workflow. A sample helps, but the machine identity and mating-part record still matter.
Material and wear protection sit outside the size code
The current EJS Twin Parallel Screw Barrel page lists 38CrMoAlA, 34CrAlNi7, 31CrMoV9, 40Cr, 42CrMo, D2 and SKD61 among its popular material options. It lists full-body nitriding, a bimetallic carbide liner for parallel twin barrels, bimetallic alloy coating for parallel twin screws, and SKD61 lining as treatment or lining routes.
That list is not a promise that every grade and treatment can be combined with every code. It is also not a service-life ranking. The quotation must connect the chosen construction to the actual polymer, filler, recycled content, operating temperature, corrosion history, wear position and mating component.
| Website-listed route | What to specify in the RFQ | What not to write |
|---|---|---|
| Full-body nitriding | Named base steel, required nitrided case, hardness method, drawing surfaces and inspection evidence. | "Nitrided for long life" with no measurable acceptance requirement. |
| Bimetallic carbide barrel liner | Liner or alloy designation, covered bore length, layer requirement, bond or integrity check and matching screw surface. | A fabricated life multiplier or a claim that every bimetallic alloy performs the same. |
| Bimetallic alloy coating on screws | Coating or hardfacing designation, covered flight zones, layer requirement, finish dimensions and mating barrel condition. | A material choice based on the size code alone. |
| SKD61 lining | Lined area, construction detail, heat treatment, hardness requirement and drawing interfaces. | An assumption that the grade name defines the complete construction. |
The same caution applies to numbers found on older website tables. Where an EJS catalogue, product table and current engineering quotation differ, the order should use the value confirmed for the specific part and written on the approved drawing or quotation. A size-code article should not turn a general material table into a part-specific guarantee.
Build a replacement identification pack in six moves
- Photograph the machine identity. Capture the complete nameplate in focus. Add separate close photographs if the model, serial number or electrical data cannot be read in one frame.
- Copy the code exactly. Keep letters, zeros, slashes, hyphens and suffixes. Write where the code came from: nameplate, manual, drawing, purchase record or mark on the part.
- Collect the original documents. Send the processing-unit drawing, screw drawing, barrel drawing, BOM or original part number. Include the revision and units on every sheet.
- Record both mating sides. For screws, capture both drive ends and the discharge ends. For barrels, capture inlet, outlet, flange, register, bolt pattern, ports and heating or cooling connections.
- Measure with datums. State the instrument, datum and measurement position. For twin bores, record both bores and center distance at several axial stations, not one convenient reading.
- Add the process duty. State the polymer and formulation, fillers or fibers, recycled content, output, screw speed, torque or load trend, temperatures, observed wear and the problem the replacement is expected to solve.
Before shipment, inspect against the approved drawing rather than against the model code. EJS states that customized parallel twin screw barrels are checked at least five times against drawings during production and that a final inspection report is provided. Its product page also states that an inspection report and material certificate are provided with supplied screw barrels. Put the exact documents and critical measured fields you require on the quotation and purchase order so the final report is useful. The live EJS screw barrel quality inspection guide explains how to turn those documents into an acceptance record.
Prepare a code-based replacement RFQ
Use the code to start the request, then attach the evidence that makes it manufacturable. Do not submit only a diameter or a cropped label. Final dimensions, materials, treatments and inspection points must be confirmed in the approved quotation and drawing.
Frequently asked questions
What does 92/32 mean on a parallel twin screw extruder?
Do not assign a universal meaning from the code alone. In some documented machine families a number pair can refer to nominal screw size and process length, but the convention must be verified from the exact OEM model, manual or drawing. Send 92/32 with the maker, full model, serial number and processing-unit documents.
Are 92/28 and 92/32 twin screw barrels interchangeable?
No interchangeability should be assumed. EJS lists 92/28 and 92/32 separately. Check the complete machine designation, process length, screw geometry, barrel zoning, drive connection, flange, ports, bore dimensions and center distance before treating either as a replacement.
Does CM80 mean the barrel bore is exactly 80 mm?
Not from the code alone. Treat CM80 as a complete family identifier until its meaning is confirmed from the original machine documents. Measure both bores and center distance and include the machine maker, model and serial number in the inquiry.
Is a parallel twin screw size code enough to manufacture a replacement?
No. The code can help locate a machine family or archived record. Manufacturing still requires an approved specification covering screw and barrel geometry, drive ends, bore center distance, flange and register, bolt pattern, ports, material, treatment and inspection requirements.
Which parallel twin screw barrel codes does EJS list?
The current EJS pages list 40KK, Ø45, CM58, 67/22, 68/25, CM80, 114/32, 92/28, 92/32, 90/16, 90/22, 75/32, 81/17 and Ø250. The extruder barrels page also gives a diameter-style twin-cylinder range of Ø45/2 to Ø250/2. Each inquiry still needs exact machine and part data.
What materials and treatments does EJS list for parallel twin screw barrels?
The current EJS product page lists 38CrMoAlA, 34CrAlNi7, 31CrMoV9, 40Cr, 42CrMo, D2 and SKD61 among its material options. It lists full-body nitriding, a bimetallic carbide liner for parallel twin barrels, bimetallic alloy coating for parallel twin screws and SKD61 lining. Final selection must be confirmed for the process and part.
What should I send if the original drawing is missing?
Send a readable machine nameplate, the exact code and its source, full model and serial number, photographs of every interface, calibrated measurements tied to stated datums, both bore measurements, center distance, a marked worn sample if available, material records, process duty and wear history. A worn sample should not be treated as an unworn master.