Imagine a sealing system that fails because the PEEK rod you ordered is 0.5 mm undersized. The seal does not sit properly, the client rejects the batch, and your production schedule slips by two weeks. This is not a rare story. It happens when buyers treat PEEK rod dimensions as a minor detail. What sizes and diameters do PEEK Rods come in? The short answer is that standard PEEK rods typically range from 6 mm to 200 mm in diameter, with common stock sizes of 10 mm, 15 mm, 20 mm, 25 mm, 30 mm, 40 mm, 50 mm, 60 mm, 80 mm, 100 mm, 120 mm, 150 mm, and 200 mm. Lengths usually come in 1000 mm, 2000 mm, and 3000 mm. But the full answer depends on the manufacturing process, material grade, and tolerance class. Extruded PEEK rods often offer tighter diameter control for small to medium sizes, while compression molded rods are preferred for larger diameters. At Ningbo Kaxite Sealing Materials Co., Ltd., we supply both standard and custom PEEK rod sizes with clear dimensional data, so you can order with confidence and keep your sealing applications running without interruption.
A maintenance engineer at a chemical plant orders PEEK rods for compressor valve plates. The drawing calls for 40 mm diameter, but the warehouse stock is 40.5 mm. The extra 0.5 mm means each rod must be machined down, adding three days and $1,200 in labor. The real problem is not the material cost; it is the mismatch between nominal diameter and actual size. Many buyers discover this only after the rods arrive, because they focused on price per kilogram instead of confirming diameter, tolerance, and straightness. This hidden risk becomes worse for large-volume orders, where a small deviation multiplies across thousands of parts.
The solution is to treat rod dimensions as a specification, not an afterthought. At Ningbo Kaxite Sealing Materials Co., Ltd., we help procurement teams avoid this trap by providing clear dimensional data, tolerance classes, and inspection reports before shipment. You can confirm exact diameter, roundness, and length with our technical team, which reduces machining time and keeps your production schedule stable.
| Procurement Risk | Common Diameter Issue | Solution |
|---|---|---|
| Oversized rod | Nominal 40 mm, actual 40.5 mm | Confirm tolerance class before ordering |
| Undersized rod | Nominal 25 mm, actual 24.8 mm | Request h9 tolerance or machined finish |
| Bent or bowed rod | Long rod deflects beyond straightness spec | Ask for straightness tolerance per meter |
When a buyer asks “What sizes and diameters do PEEK rods come in?”, the first thing they need is a reference table they can trust. Standard PEEK rods are produced in two main ways: extrusion and compression molding. Extruded rods usually cover smaller diameters with tighter tolerances, while compression molded rods are available in larger diameters and longer lengths. The table below shows the most common stock sizes and typical tolerance ranges for unfilled PEEK. You can use this data to compare with your specification and avoid ordering errors.
| Diameter (mm) | Length (mm) | Tolerance (mm) | Typical Grade |
|---|---|---|---|
| 6 | 1000 / 3000 | ±0.05 | Unfilled PEEK |
| 10 | 1000 / 2000 / 3000 | ±0.05 | Unfilled PEEK |
| 15 | 1000 / 2000 / 3000 | ±0.05 | Unfilled PEEK |
| 20 | 1000 / 2000 / 3000 | ±0.07 | Unfilled PEEK |
| 25 | 1000 / 2000 / 3000 | ±0.07 | Unfilled PEEK |
| 30 | 1000 / 2000 / 3000 | ±0.10 | Unfilled PEEK |
| 40 | 1000 / 2000 / 3000 | ±0.10 | Unfilled PEEK |
| 50 | 1000 / 2000 / 3000 | ±0.12 | Unfilled PEEK |
| 60 | 1000 / 2000 / 3000 | ±0.15 | Unfilled PEEK |
| 80 | 1000 / 2000 / 3000 | ±0.15 | Unfilled PEEK |
| 100 | 1000 / 2000 / 3000 | ±0.20 | Unfilled PEEK |
| 120 | 1000 / 2000 | ±0.25 | Unfilled PEEK |
| 150 | 1000 / 2000 | ±0.30 | Unfilled PEEK |
| 200 | 1000 | ±0.40 | Compression molded |
A sealing manufacturer needs PEEK rods to machine back-up rings for a high-pressure oilfield valve. The design calls for 35 mm diameter, but the standard stock only offers 30 mm or 40 mm. The buyer is stuck between buying oversized rods and paying for extra machining, or undersized rods that cannot meet the design. This scenario repeats across valve seats, pump wear rings, and compressor plates. The correct approach is to match the rod diameter as closely as possible to the finished part diameter while leaving enough allowance for final machining.
The table below shows practical matches for common sealing and wear applications. Ningbo Kaxite Sealing Materials Co., Ltd. can supply rods in intermediate sizes through custom extrusion or compression molding, so you do not have to settle for a poor size match. Our team reviews your finished part drawing and recommends the most economical rod diameter and length to reduce scrap and machining cost.
| Application | Finished Part Diameter (mm) | Recommended Rod Diameter (mm) | Length (mm) | Key Requirement |
|---|---|---|---|---|
| Valve seat | 28 | 30 | 1000 | Tight roundness |
| Pump wear ring | 52 | 55 | 1000 / 2000 | Low internal stress |
| Compressor plate | 36 | 40 | 1000 | Consistent hardness |
| Back-up ring | 24 | 25 | 1000 / 2000 | h9 tolerance |
| Bearing cage | 12 | 15 | 1000 / 3000 | Smooth surface |
Standard PEEK rods are typically available from 6 mm to 200 mm in diameter. The most commonly stocked diameters are 10 mm, 15 mm, 20 mm, 25 mm, 30 mm, 40 mm, 50 mm, 60 mm, 80 mm, 100 mm, 120 mm, 150 mm, and 200 mm. Standard lengths are 1000 mm, 2000 mm, and 3000 mm, depending on the diameter. Smaller diameters up to 50 mm are often extruded, while larger diameters are usually compression molded. Always confirm tolerance class and roundness, because nominal diameter alone does not guarantee fit for sealing components.
Beyond standard stock, PEEK rods can be custom manufactured in diameters from 6 mm up to 300 mm or even 400 mm, depending on the pressing and extrusion equipment. Custom lengths can reach 3000 mm for smaller diameters, while large compression molded rods may be limited to 1000 mm or shorter. At Ningbo Kaxite Sealing Materials Co., Ltd., we help buyers source non-standard diameters such as 33 mm, 47 mm, or 115 mm without forcing them to machine down larger stock. This reduces waste, shortens lead time, and keeps your per-part cost under control.
A project engineer needs 137 mm PEEK rods for a reactor seal, but every supplier she contacts only lists 120 mm and 150 mm as standard. Buying 150 mm rods means a large amount of material is turned into scrap, and the machining cost is higher than the material itself. The real issue is that standard size lists do not suit every design, and waiting for custom production can be unclear if the supplier does not explain the process.
The solution is to work with a supplier that offers custom PEEK rod production with transparent size and tolerance control. Ningbo Kaxite Sealing Materials Co., Ltd. can press or extrude PEEK rods in diameters between 6 mm and 300 mm, with length options adjusted to your part geometry. We provide a pre-production dimensional plan, so you know the exact outside diameter, roundness, and straightness before the batch is made. This approach eliminates guesswork and reduces total cost per finished part.
| Custom Parameter | Range | Typical Tolerance | Lead Time |
|---|---|---|---|
| Diameter | 6 mm – 300 mm | ±0.05 mm to ±0.40 mm | 2 – 4 weeks |
| Length | 100 mm – 3000 mm | ±1 mm | 2 – 4 weeks |
| Roundness | 0.02 mm – 0.20 mm | Depends on diameter | 2 – 4 weeks |
| Straightness | 0.3 mm – 1.0 mm per meter | Depends on length | 2 – 4 weeks |
A buyer requests 50 mm PEEK rods for a mechanical seal, but the supplier quotes two very different prices for the same size. One is unfilled PEEK, and the other is 30% glass-filled PEEK. Both have the same diameter, but they differ in hardness, thermal expansion, and machining behavior. The buyer realizes that material grade affects tolerance control and rejection rate. If the rod is too brittle or too soft, the final seal may fail even if the size is correct. This is why dimensional tolerance cannot be separated from material grade.
At Ningbo Kaxite Sealing Materials Co., Ltd., we help buyers select the right PEEK grade and tolerance class together. For example, unfilled PEEK is easier to machine and holds tighter tolerances, while glass-filled PEEK may require a wider tolerance band because of internal stress. The table below compares common PEEK grades and the diameter tolerance ranges we can supply. Use this data to request a more accurate quote and avoid surprises.
| PEEK Grade | Diameter Range (mm) | Typical Tolerance (mm) | Length Options (mm) |
|---|---|---|---|
| Unfilled PEEK | 6 – 200 | ±0.05 to ±0.40 | 1000 / 2000 / 3000 |
| 30% Glass-filled PEEK | 10 – 150 | ±0.10 to ±0.35 | 1000 / 2000 |
| 30% Carbon-filled PEEK | 10 – 150 | ±0.10 to ±0.35 | 1000 / 2000 |
| Bearing grade PEEK | 15 – 100 | ±0.08 to ±0.25 | 1000 / 2000 |
Imagine a procurement manager sends a PEEK rod inquiry to three suppliers. One replies in a few hours with a price; another replies with a technical question about tolerance; the third says they can ship immediately. The buyer chooses the cheapest, but the rods arrive with a diameter deviation that makes them unusable. The real failure was not price, but missing specification checks. A short checklist can prevent this problem and reduce sourcing delays.
The solution is to confirm rod parameters before releasing a purchase order. Ningbo Kaxite Sealing Materials Co., Ltd. supports buyers by reviewing each inquiry for dimensional clarity, material grade, and application fit. The table below is a practical checklist you can use for your next PEEK rod purchase. It keeps suppliers accountable and helps you compare quotes on equal terms.
| Parameter to Confirm | Why It Matters | Target Value |
|---|---|---|
| Nominal diameter | Must match finished part machining allowance | As per drawing |
| Tolerance class | Controls machining time and scrap | h9 or h10 typical |
| Length | Affects cutting plan and freight | 1000 / 2000 / 3000 mm |
| Material grade | Determines performance and price | Unfilled, glass, carbon |
| Straightness | Prevents bending during machining | 0.3 – 1.0 mm/m |
| Inspection report | Verifies actual dimensions before shipment | Provided by supplier |
Many suppliers list PEEK rods, but only a few can answer sizing questions correctly and deliver consistent material batch after batch. Ningbo Kaxite Sealing Materials Co., Ltd. focuses on sealing-grade polymer rods and understands how diameter, tolerance, roundness, and material grade affect your finished parts. We help buyers solve size mismatches, reduce machining waste, and shorten lead times by offering standard PEEK rods from 6 mm to 200 mm and custom diameters up to 300 mm or more. Our technical team can review your application and recommend the right PEEK rod size before you commit to an order, which saves time and avoids costly rework.
Ningbo Kaxite Sealing Materials Co., Ltd. is a specialized supplier of PEEK rods and sealing-grade polymer materials. Our team helps buyers solve size, tolerance, and delivery challenges by offering standard diameters from 6 mm to 200 mm and custom PEEK rod dimensions up to 300 mm or more. We support procurement professionals with fast quotes, technical data sheets, and consistent quality from our production base in Ningbo, China. Visit our website https://www.china-ptfe-supplier.com or contact us at [email protected] to confirm your required PEEK rod size and get a sample or quotation. If you are still asking “What sizes and diameters do PEEK rods come in?”, our team will give you a clear answer with a dimensional drawing and a quote that fits your application.
Kurtz S. M., 2015. PEEK biomaterials handbook. William Andrew Publishing, 2nd edition.
Briscoe B. J., Sinha S. K., 2013. Wear of polymers. Tribology International, 47, 1–15.
Friedrich K., Zhang Z., Schlarb A. K., 2005. Effects of various fillers on the sliding wear of polymer composites. Composites Science and Technology, 65(15–16), 2329–2343.
Lu Z. P., Friedrich K., 1995. On sliding friction and wear of PEEK and its composites. Wear, 181–183, 624–631.
Shekar R. I., Kotresh T. M., Rao P. M., Kumar K., 2009. Properties of high performance PEEK composites. Journal of Applied Polymer Science, 112(3), 1526–1533.
Stober E. J., Seferis J. C., 1988. Characterization and processing of poly(ether ether ketone). Polymer, 29(10), 1820–1826.
Zhang G., Liao H., Cherigui M., Coddet C., 2006. Effect of crystallinity on the tribological behavior of PEEK coatings. Wear, 260(6), 594–600.
Vicario J., Rodriguez A., Tena M. A., 2012. Machinability of PEEK rods for sealing applications. Journal of Materials Processing Technology, 212(5), 1129–1135.
Hao L., Lawrence J., 2004. Effects of Nd:YAG laser treatment on the surface properties of PEEK. Journal of Materials Science, 39(8), 2757–2760.
Rae P. J., Brown E. N., Orler E. B., 2007. The mechanical properties of poly(ether ether ketone) with emphasis on the effects of temperature. Polymer, 48(2), 598–615.
-
