--- title: "PTFE Anaerobic Threadlockers and Thread Sealants" description: "PTFE Anaerobic Threadlockers and Thread Sealants (polytetrafluoroethylene (thermoplastic, not an elastomer)): near-universal chemical resistance; no elastic" url: https://engineeringhardware.com/guide/material/ptfe-anaerobic-threadlockers/ source: Engineering Hardware & Fasteners --- # PTFE Anaerobic Threadlockers and Thread Sealants Seals · Trade series (anaerobic adhesives for threaded assemblies) Temperature range, chemical and fluid compatibility, hardness and the full dimensional range for this compound. PTFE Anaerobic Threadlockers and Thread Sealants are supplied to polytetrafluoroethylene (thermoplastic, not an elastomer). Corrosion behaviour is near-universal chemical resistance; no elastic recovery, so it is used as a back-up or energised seal, the material is non-magnetic, and the usable service range is approx. -200 °C to +260 °C. In practice this grade is chosen for chemical service and low friction rather than for elastic sealing. - **Grade:** polytetrafluoroethylene (thermoplastic, not an elastomer) - **Corrosion resistance:** Near-universal chemical resistance; no elastic recovery, so it is used as a back-up or energised seal - **Magnetic response:** Non-magnetic - **Service temperature:** approx. -200 °C to +260 °C Property values are typical for the grade. Certified mechanical test data is available on request for production orders. ![PTFE Anaerobic Threadlockers and Thread Sealants reference image](https://engineeringhardware.com/wp-content/uploads/2026/09/Anaerobic-Threadlockers.webp) PTFE Anaerobic Threadlockers and Thread Sealants are supplied to our own published dimensions — this is a trade-series article rather than one covered by a dimensional standard, so confirm the figures against the part you are replacing. The grade provides near-universal chemical resistance; no elastic recovery, so it is used as a back-up or energised seal and is non-magnetic; the practical service range is approx. -200 °C to +260 °C. ## Why Choose PTFE for Anaerobic Threadlockers and Thread Sealants Chosen for chemical service and low friction rather than for elastic sealing. For anaerobic threadlockers and thread sealants, this matters when near-universal chemical resistance; no elastic recovery, so it is used as a back-up or energised seal is the primary requirement. ## Mechanical & Physical Properties | Grade designation | polytetrafluoroethylene (thermoplastic, not an elastomer) | | --- | --- | | Magnetic response | Non-magnetic | | Service temperature | approx. -200 °C to +260 °C | | Corrosion characteristic | Near-universal chemical resistance; no elastic recovery, so it is used as a back-up or energised seal | ## Galvanic & Galling Considerations Galvanic and galling behavior do not apply to anaerobic threadlockers and thread sealants in PTFE — the relevant compatibility questions are chemical: confirm the elastomer against the fluid, the temperature and any cleaning agents in service, and check the gland or groove dimensions give the intended compression on the section. ## Comparable Grades For anaerobic threadlockers and thread sealants, consider an energised or spring-loaded PTFE seal where recovery is required, or FKM where the chemistry allows an elastomer. Elastomer selection is decided by the medium, the temperature range and whether the seal is static or dynamic — not by strength. ## Sizes of Anaerobic Threadlockers and Thread Sealants Available in PTFE | Grade | Removal | Typical use | Notes | | --- | --- | --- | --- | | low strength | hand tools | set screws, adjusting screws, small fasteners | up to about M12 | | medium strength | hand tools | general assembly, machine screws | the usual default | | high strength | heat and hand tools | studs, permanent assemblies | not for parts serviced in the field | | thread sealant grade | hand tools | tapered pipe threads, hydraulic fittings | seals rather than locks | | retaining compound | heat | bearings, bushes, cylindrical fits | not a thread product | Dimensions are independent of the material: every size above is available in PTFE. Custom manufacturing · Made to drawing ## Need this seal in a grade that is not listed? Ptfe is one of the grades the catalog describes. A special seal is almost always a compound change rather than a size change — the same dimensions in a material that survives the medium. Minimum order from 2,000 pieces; samples within 7 days of drawing approval. [Custom seal manufacturing](https://engineeringhardware.com/custom/seals/)[Send a drawing](https://engineeringhardware.com/custom/seals/#rfq) ## Technical Drawing Dimensioned line drawing of low strength Anaerobic Threadlockers and Thread Sealants to Trade series (anaerobic adhesives for threaded assemblies). Side view and top view, drawn to the dimensions in the table below and redrawn for any size selected. - **Removal:** hand tools - **Typical use:** set screws, adjusting screws, small fasteners - **Notes:** up to about M12 ## Dimensions & Specifications (Trade series (anaerobic adhesives for threaded assemblies)) | Grade | Removal | Typical use | Notes | | --- | --- | --- | --- | | low strength | hand tools | set screws, adjusting screws, small fasteners | up to about M12 | | medium strength | hand tools | general assembly, machine screws | the usual default | | high strength | heat and hand tools | studs, permanent assemblies | not for parts serviced in the field | | thread sealant grade | hand tools | tapered pipe threads, hydraulic fittings | seals rather than locks | | retaining compound | heat | bearings, bushes, cylindrical fits | not a thread product | Product catalog ## Related Thread Sealants & Threadlockers products [![Customized Size Factory-Direct Keylocking Threaded 303 304 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These are the ones we ship them for. Stocked from low strength to retaining compound (inside diameter). ### Industries that specify Anaerobic Threadlockers and Thread Sealants - **Field maintenance:** Securing set screws. - **Machine assembly:** Fasteners that must not loosen. - **Automotive:** Vibration-prone joints. - **Hydraulics:** Tapered thread sealing. - **Process & food equipment:** Sealing at joints that are cleaned and inspected. - **Hydraulics & pneumatics:** Static and dynamic sealing in cylinders and valve bodies. ### Typical applications - allowing the stated cure time before loading the joint - choosing the grade by how the joint will be serviced - degreasing both threads before applying - using a sealant grade rather than a locking grade on pipe threads - excluding dust and moisture from a housing - sealing a joint against fluid or air pressure ### Service conditions to specify against - **Sealed joints:** Used where the fixing has to keep water or air out as well as hold — the elastomer, not the fastener, decides service life. - **Vibration:** Specified where cyclic load would loosen a plain nut or screw — rotating plant, rail, mobile equipment and anything that is not re-torqued in service. ### Where to use something else - Do not use a high-strength grade on anything that will be serviced in the field; removing it needs heat, and heat is rarely available where the fastener has to come out. [Full application guide: where Anaerobic Threadlockers and Thread Sealants are used, how to specify them, and the cases they are wrong for](https://engineeringhardware.com/applications/anaerobic-threadlockers/) Inside the plant ## Manufactured in our own plant This part is cold-formed, threaded, heat-treated and finished in-house. The stages below are where its class and finish are actually decided. 1. ![Wire rod feeding into a cold heading machine](https://engineeringhardware.com/wp-content/uploads/2026/08/09-wire-rod-feed-cold-heading-machine.webp) 01 **Cold heading** Wire rod is drawn to size and cold-formed into blanks. Forming rather than cutting keeps the grain flow continuous around the head, which is where a bolt is most likely to fail. Head dimensions and under-head radius checked at set-up and per shift. 2. ![Thread rolling machine producing bolt threads](https://engineeringhardware.com/wp-content/uploads/2026/08/03-thread-rolling-machine-bolt-production.webp) 02 **Thread rolling** Threads are rolled between hardened dies rather than cut. Rolled threads are stronger in fatigue than cut threads and hold pitch and flank angle far more consistently across a batch. Go / no-go ring gauges to ISO 965 tolerance class 6g. 3. ![Baskets of bolts staged for heat treatment](https://engineeringhardware.com/wp-content/uploads/2026/08/05-heat-treatment-baskets-black-bolts.webp) 03 **Heat treatment** Quench-and-temper brings carbon and alloy steel to the property class ordered — 8.8, 10.9 or 12.9 — with the furnace charge tracked so a finished lot can be traced back to it. Core hardness and tensile tested per lot to ISO 898-1. 4. ![Zinc plated bolts in a treatment basket](https://engineeringhardware.com/wp-content/uploads/2026/08/23-zinc-plated-bolts-treatment-basket.webp) 04 **Surface treatment** Zinc, zinc-nickel, hot-dip galvanizing, black oxide, phosphate and Dacromet, selected against the service environment rather than against the price list. Coating thickness and neutral salt spray hours to ISO 9227. ## Frequently Asked Questions ### Are PTFE Anaerobic Threadlockers and Thread Sealants magnetic? PTFE Anaerobic Threadlockers and Thread Sealants are non-magnetic. ### What corrosion resistance do PTFE Anaerobic Threadlockers and Thread Sealants offer? PTFE Anaerobic Threadlockers and Thread Sealants provide near-universal chemical resistance; no elastic recovery, so it is used as a back-up or energised seal with a service range of approx. -200 °C to +260 °C. ### Which media is PTFE suitable for? PTFE suits almost every chemical, over a very wide temperature range. It is the wrong choice for anything needing elastic recovery — it cold-flows and takes a set. Elastomer selection is decided by the fluid first, then the temperature, then whether the seal is static or dynamic. ### What hardness are PTFE Anaerobic Threadlockers and Thread Sealants supplied in? Shore A 70 is the general-purpose default. A softer compound (around 60) seals better on a rough or slightly out-of-round surface; a harder one (around 80 to 90) resists extrusion at higher pressure or across a wider gap. State the hardness on the order — it is not implied by the material. ### How do I request a quotation? Use the technical drawing on this page to pick the exact configuration, then submit it with the quote form. We respond within one business day. ## Related Pages [View the full Anaerobic Threadlockers and Thread Sealants page](https://engineeringhardware.com/fastener/anaerobic-threadlockers/) ### More Anaerobic Threadlockers and Thread Sealants Guides