--- title: "NBR (Nitrile) PTFE Thread Seal Tape" description: "NBR (Nitrile) PTFE Thread Seal Tape (acrylonitrile-butadiene rubber, typically 70 Shore A): good resistance to mineral oil, grease and hydraulic fluid; poor" url: https://engineeringhardware.com/guide/material/nbr-ptfe-thread-seal-tape/ source: Engineering Hardware & Fasteners --- # NBR (Nitrile) PTFE Thread Seal Tape Seals · Trade series (PTFE thread sealing tape, colour-coded by density) Temperature range, chemical and fluid compatibility, hardness and the full dimensional range for this compound. NBR (Nitrile) PTFE Thread Seal Tape are supplied to acrylonitrile-butadiene rubber, typically 70 Shore A. Corrosion behaviour is good resistance to mineral oil, grease and hydraulic fluid; poor in ozone and weathering, the material is non-magnetic, and the usable service range is approx. -30 °C to +100 °C. In practice this grade is the default elastomer for oil and hydraulic sealing. - **Grade:** acrylonitrile-butadiene rubber, typically 70 Shore A - **Corrosion resistance:** Good resistance to mineral oil, grease and hydraulic fluid; poor in ozone and weathering - **Magnetic response:** Non-magnetic - **Service temperature:** approx. -30 °C to +100 °C Property values are typical for the grade. Certified mechanical test data is available on request for production orders. ![NBR (Nitrile) PTFE Thread Seal Tape reference image](https://engineeringhardware.com/wp-content/uploads/2026/09/PTFE-Thread-Seal-Tape.webp) NBR (Nitrile) (acrylonitrile-butadiene rubber, typically 70 Shore A) is the default elastomer for oil and hydraulic sealing. Specified on ptfe thread seal tape it determines the corrosion behaviour (good resistance to mineral oil, grease and hydraulic fluid; poor in ozone and weathering) and the service temperature range (approx. -30 °C to +100 °C); the dimensions are ours rather than a standard's, and are listed in full below. ## Why Choose NBR (Nitrile) for PTFE Thread Seal Tape The default elastomer for oil and hydraulic sealing. For ptfe thread seal tape, this matters when good resistance to mineral oil, grease and hydraulic fluid; poor in ozone and weathering is the primary requirement. ## Mechanical & Physical Properties | Grade designation | acrylonitrile-butadiene rubber, typically 70 Shore A | | --- | --- | | Magnetic response | Non-magnetic | | Service temperature | approx. -30 °C to +100 °C | | Corrosion characteristic | Good resistance to mineral oil, grease and hydraulic fluid; poor in ozone and weathering | ## Corrosion Behavior in Service Carbon and alloy steel ptfe thread seal tape 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. ## Galvanic & Galling Considerations Galvanic and galling behavior do not apply to ptfe thread seal tape in NBR (Nitrile) — 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. ## Sizes of PTFE Thread Seal Tape Available in NBR (Nitrile) | Colour | Density | Intended service | Notes | | --- | --- | --- | --- | | white | standard density | water and general plumbing | general purpose | | pink | high density | water, larger threads | thicker, fewer wraps needed | | yellow | high density | gas lines | gas-rated tape | | green | oil-free, degreased | oxygen service | must be oxygen-clean | | grey | with filler | stainless steel threads | reduces galling on stainless | Dimensions are independent of the material: every size above is available in NBR (Nitrile). Custom manufacturing · Made to drawing ## Need this seal in a grade that is not listed? Nbr is one of the grades the catalog describes. Inside diameter, cross-section and compound are the three that matter, and the compound is chosen against the fluid and the temperature rather than the dimensions. 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 white PTFE Thread Seal Tape to Trade series (PTFE thread sealing tape, colour-coded by density). Side view and top view, drawn to the dimensions in the table below and redrawn for any size selected. - **Density:** standard density - **Intended service:** water and general plumbing - **Notes:** general purpose ## Dimensions & Specifications (Trade series (PTFE thread sealing tape, colour-coded by density)) | Colour | Density | Intended service | Notes | | --- | --- | --- | --- | | white | standard density | water and general plumbing | general purpose | | pink | high density | water, larger threads | thicker, fewer wraps needed | | yellow | high density | gas lines | gas-rated tape | | green | oil-free, degreased | oxygen service | must be oxygen-clean | | grey | with filler | stainless steel threads | reduces galling on stainless | Product catalog ## Related Thread Sealants & Threadlockers products [![Custom Long Fasteners Self Tapping Screws Carbon Stainless Steel Threaded Rod Long Screw](https://img.engineeringhardware.com/Custom-Long-Fasteners-Self-Tapping-Screws-Carbon-Stainless-Steel-Threaded-Rod-Long-Screw.webp)](https://engineeringhardware.com/product/custom-long-fasteners-self-tapping-screws-carbon-stainless-steel-threaded-rod-long/) Self-Tapping & Thread-Forming Screws ### [Custom Long Fasteners Self Tapping Screws Carbon Stainless Steel Threaded Rod Long Screw](https://engineeringhardware.com/product/custom-long-fasteners-self-tapping-screws-carbon-stainless-steel-threaded-rod-long/) Round Head · DIN, GB, ANSI, BSW, JIS, GOST, ISO **US$0.036 – 0.06**MOQ 10,000 pieces [![Manufacturer OEM Stainless Steel Screw Countersunk Head Self Tapping Screws](https://img.engineeringhardware.com/Manufacturer-OEM-Stainless-Steel-Screw-Countersunk-Head-Self-Tapping-Screws.webp)](https://engineeringhardware.com/product/manufacturer-oem-stainless-steel-screw-countersunk-head-self-tapping-screws/) Self-Tapping & Thread-Forming Screws ### [Manufacturer OEM Stainless Steel Screw Countersunk Head Self Tapping Screws](https://engineeringhardware.com/product/manufacturer-oem-stainless-steel-screw-countersunk-head-self-tapping-screws/) Countersunk Head · DIN **US$0.0012 – 0.0024**MOQ 100,000 pieces [![Malaxy White Blue Zinc Plated Csk Head Self Tapping Screw](https://img.engineeringhardware.com/Malaxy-White-Blue-Zinc-Plated-Csk-Head-Self-Tapping-Screw.webp)](https://engineeringhardware.com/product/malaxy-white-blue-zinc-plated-csk-head-self-tapping-screw/) Self-Tapping & Thread-Forming Screws ### [Malaxy White Blue Zinc Plated Csk Head Self Tapping Screw](https://engineeringhardware.com/product/malaxy-white-blue-zinc-plated-csk-head-self-tapping-screw/) Countersunk Head · DIN, GB, ANSI **US$0.06 – 0.18**MOQ 1,000 pieces [![Colored Ruspert Self-Tapping Screws/Drywall Screws](https://img.engineeringhardware.com/Colored-Ruspert-Self-Tapping-Screws-Drywall-Screws.webp)](https://engineeringhardware.com/product/colored-ruspert-self-tapping-screws-drywall-screws/) Self-Tapping & Thread-Forming Screws ### [Colored Ruspert Self-Tapping Screws/Drywall Screws](https://engineeringhardware.com/product/colored-ruspert-self-tapping-screws-drywall-screws/) Hexagon Head · DIN, ANSI, BSW, JIS **US$0.012 – 0.036**MOQ 5,000 pieces [![Custom OEM Drive Pin Precision CNC Machined Self Tapping Screw Manufacturer](https://img.engineeringhardware.com/Custom-OEM-Drive-Pin-Precision-CNC-Machined-Self-Tapping-Screw-Manufacturer.webp)](https://engineeringhardware.com/product/custom-oem-drive-pin-precision-cnc-machined-self-tapping-screw-manufacturer/) Self-Tapping & Thread-Forming Screws ### [Custom OEM Drive Pin Precision CNC Machined Self Tapping Screw Manufacturer](https://engineeringhardware.com/product/custom-oem-drive-pin-precision-cnc-machined-self-tapping-screw-manufacturer/) DIN, GB, ANSI · Stainless Steel **US$1.20**MOQ 100 pieces [![Stainless Steel Cross Torx Head Self Tapping Screw Pan Head Phillips Drive Machine Screws](https://img.engineeringhardware.com/Stainless-Steel-Cross-Torx-Head-Self-Tapping-Screw-Pan-Head-Phillips-Drive-Machine-Screws.webp)](https://engineeringhardware.com/product/stainless-steel-cross-torx-head-self-tapping-screw-pan-head-phillips-drive-machine/) Self-Tapping & Thread-Forming Screws ### [Stainless Steel Cross Torx Head Self Tapping Screw Pan Head Phillips Drive Machine Screws](https://engineeringhardware.com/product/stainless-steel-cross-torx-head-self-tapping-screw-pan-head-phillips-drive-machine/) DIN, GB · Stainless Steel **US$0.024 – 0.084**MOQ 1,000 pieces [View all Self-Tapping & Thread-Forming Screws →](https://engineeringhardware.com/fastener-products/screws/self-tapping-thread-forming-screws/) [Full product catalog](https://engineeringhardware.com/products/) ## Applications & Industries What PTFE Thread Seal Tape are specified for, industry by industry. Stocked from white to grey (inside diameter). ### Industries that specify PTFE Thread Seal Tape - **Gas installation:** Gas-rated tape only. - **Process plant:** Stainless thread assembly. - **Plumbing:** Tapered pipe threads. - **Compressed air:** Fitting and manifold joints. - **Hydraulics & pneumatics:** Static and dynamic sealing in cylinders and valve bodies. - **Process & food equipment:** Sealing at joints that are cleaned and inspected. ### Typical applications - using the grey filled tape on stainless to reduce galling - keeping tape off the first thread so nothing enters the line - wrapping in the direction the fitting will turn - choosing the colour that matches the service - sealing a joint against fluid or air pressure - excluding dust and moisture from a housing ### 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. ### Where to use something else - Do not use general-purpose white tape on an oxygen line; oxygen service needs tape that is certified oil-free, and this is a safety requirement rather than a preference. [Full application guide: where PTFE Thread Seal Tape are used, how to specify them, and the cases they are wrong for](https://engineeringhardware.com/applications/ptfe-thread-seal-tape/) 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 ### Which media is NBR (Nitrile) suitable for? NBR (Nitrile) suits mineral oils, hydraulic fluids, greases and water. It is the wrong choice for ketones, brake fluid, ozone and strong acids. Elastomer selection is decided by the fluid first, then the temperature, then whether the seal is static or dynamic. ### What hardness are NBR (Nitrile) PTFE Thread Seal Tape 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. ### Does NBR (Nitrile) 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 NBR (Nitrile) ptfe thread seal tape 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. ### 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 PTFE Thread Seal Tape page](https://engineeringhardware.com/fastener/ptfe-thread-seal-tape/) ### More PTFE Thread Seal Tape Guides