--- title: "FKM (Viton®-type) Anaerobic Threadlockers and Thread Sealants" description: "FKM (Viton®-type) Anaerobic Threadlockers and Thread Sealants (fluoroelastomer, typically 75 Shore A): excellent resistance to heat, fuels, and most" url: https://engineeringhardware.com/guide/material/fkm-anaerobic-threadlockers/ source: Engineering Hardware & Fasteners --- # FKM (Viton®-type) 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. FKM (Viton®-type) Anaerobic Threadlockers and Thread Sealants are supplied to fluoroelastomer, typically 75 Shore A. Corrosion behaviour is excellent resistance to heat, fuels, and most chemicals; poor with ketones and hot water/steam, the material is non-magnetic, and the usable service range is approx. -20 °C to +200 °C. In practice this grade is specified where temperature or chemical exposure exceeds nitrile. - **Grade:** fluoroelastomer, typically 75 Shore A - **Corrosion resistance:** Excellent resistance to heat, fuels, and most chemicals; poor with ketones and hot water/steam - **Magnetic response:** Non-magnetic - **Service temperature:** approx. -20 °C to +200 °C Property values are typical for the grade. Certified mechanical test data is available on request for production orders. ![FKM (Viton®-type) Anaerobic Threadlockers and Thread Sealants reference image](https://engineeringhardware.com/wp-content/uploads/2026/09/Anaerobic-Threadlockers.webp) Material page for anaerobic threadlockers and thread sealants in FKM (Viton®-type) (fluoroelastomer, typically 75 Shore A). The sizes below are the ones we supply; there is no published dimensional standard for this article, so the table rather than a standard number is what to quote. Corrosion behaviour is excellent resistance to heat, fuels, and most chemicals; poor with ketones and hot water/steam and the service range is approx. -20 °C to +200 °C. ## Why Choose FKM (Viton®-type) for Anaerobic Threadlockers and Thread Sealants Specified where temperature or chemical exposure exceeds nitrile. For anaerobic threadlockers and thread sealants, this matters when excellent resistance to heat, fuels, and most chemicals; poor with ketones and hot water/steam is the primary requirement. ## Mechanical & Physical Properties | Grade designation | fluoroelastomer, typically 75 Shore A | | --- | --- | | Magnetic response | Non-magnetic | | Service temperature | approx. -20 °C to +200 °C | | Corrosion characteristic | Excellent resistance to heat, fuels, and most chemicals; poor with ketones and hot water/steam | ## Corrosion Behavior in Service Carbon and alloy steel anaerobic threadlockers and thread sealants require a coating for corrosion protection. Zinc plating (with or without passivation) is the most common; hot-dip galvanizing is used for outdoor structural service; black-oxide is mainly a tarnish-prevention finish for tool-room use. ## Comparable Grades For anaerobic threadlockers and thread sealants, consider NBR where the service is ordinary mineral oil and the cost matters, or EPDM for hot water and steam, which attacks FKM. 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 FKM (Viton®-type) | 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 FKM (Viton®-type). Custom manufacturing · Made to drawing ## Need this seal in a grade that is not listed? Fkm 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 [![EA Durable Helical Coil M2 M2.5 M3 Tangless Free Running Wire Screw Thread Inserts](https://img.engineeringhardware.com/EA-Durable-Helical-Coil-M2-M2-5-M3-Tangless-Free-Running-Wire-Screw-Thread-Inserts.webp)](https://engineeringhardware.com/product/ea-durable-helical-coil-m2-m2-5-m3-tangless-free-running-wire-screw-thread-inserts/) Thread Repair & Solid Threaded Inserts ### [EA Durable Helical Coil M2 M2.5 M3 Tangless Free Running Wire Screw Thread Inserts](https://engineeringhardware.com/product/ea-durable-helical-coil-m2-m2-5-m3-tangless-free-running-wire-screw-thread-inserts/) Common · Stainless Steel **US$0.048 – 0.06**MOQ 100 pieces [![Carbon Steel Nickel Plated Round Clinch Nut for Mounting Plates with M4 JIS Standard Threaded Insert](https://img.engineeringhardware.com/Carbon-Steel-Nickel-Plated-Round-Clinch-Nut-for-Mounting-Plates-with-M4-JIS-Standard-Threaded-Insert.webp)](https://engineeringhardware.com/product/carbon-steel-nickel-plated-round-clinch-nut-for-mounting-plates-with-m4-jis-standard/) Thread Repair & Solid Threaded Inserts ### [Carbon Steel Nickel Plated Round Clinch Nut for Mounting Plates with M4 JIS Standard Threaded Insert](https://engineeringhardware.com/product/carbon-steel-nickel-plated-round-clinch-nut-for-mounting-plates-with-m4-jis-standard/) Clinch Nut · DIN, ANSI, GB, JIS, GOST, BSW **US$0.012 – 2.50**MOQ 10 bags [![Hot Sale Yellow Zinc Plated Wire Screw Sleeve Self Tapping Thread Inserts](https://img.engineeringhardware.com/Hot-Sale-Yellow-Zinc-Plated-Wire-Screw-Sleeve-Self-Tapping-Thread-Inserts.webp)](https://engineeringhardware.com/product/hot-sale-yellow-zinc-plated-wire-screw-sleeve-self-tapping-thread-inserts/) Thread Repair & Solid Threaded Inserts ### [Hot Sale Yellow Zinc Plated Wire Screw Sleeve Self Tapping Thread Inserts](https://engineeringhardware.com/product/hot-sale-yellow-zinc-plated-wire-screw-sleeve-self-tapping-thread-inserts/) Common · Carbon Steel **US$0.06 – 0.072**MOQ 100 pieces [![M20 M16 Stainless Steel 304 Screw Wire Thread Reducing Inserts Screw Insert](https://img.engineeringhardware.com/M20-M16-Stainless-Steel-304-Screw-Wire-Thread-Reducing-Inserts-Screw-Insert.webp)](https://engineeringhardware.com/product/m20-m16-stainless-steel-304-screw-wire-thread-reducing-inserts-screw-insert/) Thread Repair & Solid Threaded Inserts ### [M20 M16 Stainless Steel 304 Screw Wire Thread Reducing Inserts Screw Insert](https://engineeringhardware.com/product/m20-m16-stainless-steel-304-screw-wire-thread-reducing-inserts-screw-insert/) Common · Stainless Steel **US$0.06 – 0.12**MOQ 1 piece [![Carbon Steel 10.9 M18 Sensor Threaded Insert M16 Hex Bolt](https://img.engineeringhardware.com/Carbon-Steel-10-9-M18-Sensor-Threaded-Insert-M16-Hex-Bolt.webp)](https://engineeringhardware.com/product/carbon-steel-10-9-m18-sensor-threaded-insert-m16-hex-bolt/) Thread Repair & Solid Threaded Inserts ### [Carbon Steel 10.9 M18 Sensor Threaded Insert M16 Hex Bolt](https://engineeringhardware.com/product/carbon-steel-10-9-m18-sensor-threaded-insert-m16-hex-bolt/) Hexagon Head · DIN **US$0.012 – 0.12**MOQ 1,000 pieces [![Stainless Steel M6 Fine Thread Hex Nylon Insert Self-Locking Lock Nut](https://img.engineeringhardware.com/Stainless-Steel-M6-Fine-Thread-Hex-Nylon-Insert-Self-Locking-Lock-Nut.webp)](https://engineeringhardware.com/product/stainless-steel-m6-fine-thread-hex-nylon-insert-self-locking-lock-nut/) Thread Repair & Solid Threaded Inserts ### [Stainless Steel M6 Fine Thread Hex Nylon Insert Self-Locking Lock Nut](https://engineeringhardware.com/product/stainless-steel-m6-fine-thread-hex-nylon-insert-self-locking-lock-nut/) Hexagon Head · DIN, ANSI, GB, JIS, GOST, BSW, Customized **US$0.0456 – 1.20**MOQ 10,000 pieces [View all Thread Repair & Solid Threaded Inserts →](https://engineeringhardware.com/fastener-products/threaded-inserts-clinch-fasteners/thread-repair-solid-threaded-inserts/) [Full product catalog](https://engineeringhardware.com/products/) ## Applications & Industries Anaerobic Threadlockers and Thread Sealants are bought for a small number of well-defined jobs. 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 ### Does FKM (Viton®-type) have a shelf life? Yes. Elastomers age in storage as well as in service — keep them cool, dark, dry and away from ozone sources such as electric motors, and use stock in the order it arrived. PTFE is the exception and does not age this way. ### How much compression should FKM (Viton®-type) anaerobic threadlockers and thread sealants see? The groove or gland decides it, not the seal: a static radial seal is normally designed for roughly 15–30% compression on the section, and a dynamic one for less. Give us the groove dimensions and the pressure and we will confirm the section against them. ### What's the service temperature limit for FKM (Viton®-type)? The practical service range is approx. -20 °C to +200 °C. ### Are FKM (Viton®-type) Anaerobic Threadlockers and Thread Sealants magnetic? FKM (Viton®-type) Anaerobic Threadlockers and Thread Sealants are non-magnetic. ### 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