---
title: "Silicone (VMQ) Anaerobic Threadlockers and Thread Sealants"
description: "Silicone (VMQ) Anaerobic Threadlockers and Thread Sealants (vinyl-methyl silicone, typically 70 Shore A): inert and physiologically neutral; low tear and"
url: https://engineeringhardware.com/guide/material/silicone-anaerobic-threadlockers/
source: Engineering Hardware & Fasteners
---

# Silicone (VMQ) 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.

Silicone (VMQ) Anaerobic Threadlockers and Thread Sealants are supplied to vinyl-methyl silicone, typically 70 Shore A. Corrosion behaviour is inert and physiologically neutral; low tear and abrasion strength, the material is non-magnetic, and the usable service range is approx. -60 °C to +200 °C. In practice this grade is used for wide temperature range and food/medical contact, in static seals only.

- **Grade:** vinyl-methyl silicone, typically 70 Shore A
- **Corrosion resistance:** Inert and physiologically neutral; low tear and abrasion strength
- **Magnetic response:** Non-magnetic
- **Service temperature:** approx. -60 °C to +200 °C

Property values are typical for the grade. Certified mechanical test data is available on request for production orders.

![Silicone (VMQ) Anaerobic Threadlockers and Thread Sealants reference image](https://engineeringhardware.com/wp-content/uploads/2026/09/Anaerobic-Threadlockers.webp)

Silicone (VMQ) (vinyl-methyl silicone, typically 70 Shore A) is used for wide temperature range and food/medical contact, in static seals only. Specified on anaerobic threadlockers and thread sealants it determines the corrosion behaviour (inert and physiologically neutral; low tear and abrasion strength) and the service temperature range (approx. -60 °C to +200 °C); the dimensions are ours rather than a standard's, and are listed in full below.

## Why Choose Silicone (VMQ) for Anaerobic Threadlockers and Thread Sealants

Used for wide temperature range and food/medical contact, in static seals only. For anaerobic threadlockers and thread sealants, this matters when inert and physiologically neutral; low tear and abrasion strength is the primary requirement.

## Mechanical & Physical Properties

| Grade designation | vinyl-methyl silicone, typically 70 Shore A |
| --- | --- |
| Magnetic response | Non-magnetic |
| Service temperature | approx. -60 °C to +200 °C |
| Corrosion characteristic | Inert and physiologically neutral; low tear and abrasion strength |

## 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.

## Galvanic & Galling Considerations

Galvanic and galling behavior do not apply to anaerobic threadlockers and thread sealants in Silicone (VMQ) — 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 Anaerobic Threadlockers and Thread Sealants Available in Silicone (VMQ)

| 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 Silicone (VMQ).

Custom manufacturing · Made to drawing

## Need this seal in a grade that is not listed?

Silicone 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

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## 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

### What corrosion resistance do Silicone (VMQ) Anaerobic Threadlockers and Thread Sealants offer?

Silicone (VMQ) Anaerobic Threadlockers and Thread Sealants provide inert and physiologically neutral; low tear and abrasion strength with a service range of approx. -60 °C to +200 °C.

### Which media is Silicone (VMQ) suitable for?

Silicone (VMQ) suits dry heat and cold in static service, and food contact. It is the wrong choice for dynamic duty, fuel and steam — it tears and abrades easily. Elastomer selection is decided by the fluid first, then the temperature, then whether the seal is static or dynamic.

### What hardness are Silicone (VMQ) 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.

### Does Silicone (VMQ) 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 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