---
title: "Seals"
description: "Metric O-rings to ISO 3601 and AS568 inch O-rings, bonded and self-centring USIT seal rings, PTFE thread seal tape and anaerobic thread sealants…"
url: https://engineeringhardware.com/fasteners/seals/
source: Engineering Hardware & Fasteners
---

# Seals

Catalog

Metric O-rings to ISO 3601 and AS568 inch O-rings, bonded and self-centring USIT seal rings, PTFE thread seal tape and anaerobic thread sealants — selected by cross-section, compound and the fluid they must survive.

[Anaerobic Threadlockers and Thread Sealants **Standard:** Trade series (anaerobic adhesives for threaded assemblies) **Type:** Thread Sealants & Threadlockers **Sizes:** 5 listed **From:** $6.00/pc View sizes & specs →](https://engineeringhardware.com/fastener/anaerobic-threadlockers/)

[AS568 O-Rings (Inch Series) **Standard:** AS 568 **Type:** AS568 O-Rings (Inch Series) **Sizes:** 89 listed **From:** $0.040/pc View sizes & specs →](https://engineeringhardware.com/fastener/as568-o-rings-inch/)

[Metric O-Rings (ISO 3601) **Standard:** ISO 3601-1 (fluid power — O-rings, inside diameters and cross-sections) **Type:** Metric O-Rings **Sizes:** 11 listed **From:** $0.050/pc View sizes & specs →](https://engineeringhardware.com/fastener/metric-o-rings/)

[PTFE Thread Seal Tape **Standard:** Trade series (PTFE thread sealing tape, colour-coded by density) **Type:** Thread Sealants & Threadlockers **Sizes:** 5 listed **From:** $0.35/pc View sizes & specs →](https://engineeringhardware.com/fastener/ptfe-thread-seal-tape/)

[USIT Rings (Self-Centring Bonded Seals) **Standard:** Trade series (self-centring bonded washers, USIT type) **Type:** Bonded Seal Rings **Sizes:** 10 listed **From:** $0.14/pc View sizes & specs →](https://engineeringhardware.com/fastener/usit-rings/)

[O-Ring Seal — ISO / DIN (Series 159) **Standard:** ISO / DIN **Type:** CAD O-Rings **Sizes:** 12 listed **From:** $0.050/pc View sizes & specs →](https://engineeringhardware.com/fastener/cad-svg-159-oring/)

## Not sure which fastener you need?

Use the finder to filter by category, standard, size and material, then request a quote.