What are M22 Screws?

M22 screws are metric fasteners with a 22mm thread diameter, available in both coarse (2.5mm) and fine (1.5mm) thread pitches. While less common than the adjacent M20 and M24 sizes, the M22 bolt fills a specific engineering niche, providing additional load capacity over M20 without stepping up to the heavier M24.

In heavy hydraulic systems, for example, M22 bolts are used to secure cylinder end caps and manifold connections where precise clamping force and resistance to high internal pressures are non-negotiable. Their intermediate sizing makes M22 steel screws a practical choice when standard sizes fall just short of the required strength envelope.

How M22 Size Screws Work

M22 screws are specified where the engineering calculations call for a fastener that sits between M20 and M24 in terms of tensile area and load-bearing capacity. This makes them particularly useful in heavy mechanical assemblies, press tooling and hydraulic equipment.

An M22 bolt clamped into a flanged connection benefits from a wider bearing surface than M20, reducing localised stress on gaskets and mating surfaces. The fine pitch variant is often selected for hydraulic applications, where its tighter thread engagement improves sealing performance and vibration resistance. In industrial press frames, M22 bolts resist the repeated high-force loading cycles inherent to stamping and forming operations. Though not as ubiquitous as M20, the M22 screw earns its place wherever intermediate strength is the precise requirement.

Materials M22 Screws Are Made From

Our M22 screws are crafted from high-quality materials to support a variety of operational requirements:

• High-Tensile Steel: Provides exceptional strength and durability, ideal for heavily loaded mechanical joints and structural connections.
• Stainless Steel Grades A2 and A4: A2 is a versatile option for general engineering use, while A4 offers superior resistance to corrosion, perfect for marine and chemical environments.
• A4-80 Stainless Steel: Combines the corrosion resistance of A4 with enhanced tensile strength, suited to demanding applications in harsh conditions.
• Brass: Offers excellent resistance to corrosion and is easy to machine, making it suitable for decorative and electrical applications.
• Aluminium: Lightweight with good corrosion resistance, suited to applications where weight reduction is a priority.
• Nylon and PEEK: Lightweight thermoplastics offering excellent chemical resistance and electrical insulation properties, used in specialist engineering projects.

Sizes and Types of M22 Screws Available

M22 screws come in a range of configurations to meet various project specifications:

• Lengths: Available in lengths ranging from 25mm to 200mm.
• Head Types: Hexagon and cap head profiles are available to suit different installation and clearance requirements.
• Thread Types: Fully threaded and partially threaded variants provide flexibility for different fastening requirements.
• Drive Types: Choose from Hex Socket and External Hex drive styles to suit your tooling preferences.
• Finishes: Options such as AccuLock thread locking prevent loosening under vibration, while AccuBlack chemical blackening delivers a sleek, dark aesthetic.

FAQs

Q: Why would I choose an M22 bolt over an M20 or M24?

 A: M22 bolts provide a tensile stress area between M20 and M24, making them the right choice when M20 is insufficient for the load but M24 would be oversized for the available clearance or flange geometry. They are particularly common in hydraulic and press tooling applications.

Q: What is the thread pitch of an M22 screw?

 A: M22 screws are available in coarse (2.5mm) and fine (1.5mm) thread pitches. The coarse pitch shares the same value as M18 and M20 fasteners, which simplifies tooling and tapping requirements when working across these sizes. The fine pitch offers improved vibration resistance and finer preload control.

Q: Is the M22 bolt size commonly stocked?

 A: While M22 is less universally stocked than M20 or M24, Accu maintains availability across key materials and lengths in both coarse and fine pitch. Custom manufacturing is also available for non-standard M22 steel screw specifications.

Q: What spanner size fits an M22 hex bolt?

 A: An M22 hexagon bolt typically has an across-flats dimension of 34mm, requiring a 34mm spanner or socket for installation.

Bespoke M22 Screws Manufacture.

High precision, bespoke manufacture of M22 Screws to customer specification. State of the art facilities specialising in both small batch prototyping and large scale manufacture.