What is the difference between a2 and bzp

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You should upgrade or use an alternative browser. BZP strength. Thread starter JimM Start date Jul 11, JimM Member. Messages Hi all I need some M6 threaded bar for use in clamping bits and pieces down on my milling machine.

Screwfix have various bar listed but don't give any indication of tensile strength etc If it's listed simply as BZP is this likely to be 8. Messages 1, I would think it is just zinc plated mild steel. Hitch Moderator Staff member. Messages 12, Location England. Studding is usually 4. Stainless steel differs from standard carbon steel by the amount of chromium present.

Unprotected carbon steel rusts readily when exposed to air and moisture. Although both HDG and Stainless Steel fixings are decent options to protect against rust, Stainless Steel offers greater corrosion protection than HDG and is ideal for use in outdoor applications, especially where the finish is desired to be aesthetically pleasing. There is no evident visual difference between A2 and A4 stainless Steel fasteners as they are both polished using the same process, but they do have slightly different characteristics.

A2 Stainless Steel is the most common type used for the manufacture of Stainless Steel fasteners and fixings. Aside from fasteners, A2 Stainless Steel is also used for many household products due to its resistant to sterilising solutions, foodstuffs and inorganic chemicals.

Although even A2 Stainless Steel can tarnish eventually over time. A4 Stainless Steel products generally last a very long time due to their extra resistance to corrosion and tarnish. Although, the extra cost can be justified when used in the right conditions, with the higher corrosion resistance meaning over a long period of time the fasteners need less maintenance or replacement.

Both types can be a cost-effective option, with A2 Stainless Steel fasteners being far the most commonly used in construction. A2 Stainless Steel fixings will be up to the vast majority jobs including those near to marine environments subject to specification.

However, if you are using fixings in a specific marine or chemical environment which require industrial-strength corrosion resistance, then A4 Stainless Steel fixings should be used. As you would have read above there are pros and cons for each… BZP and HDG steel fixings are generally cheaper and more readily available, with HDG fixings offering very good corrosion protection.

Ultimately there is no definitive answer and a lot will depend on the conditions the fixings will be used in and project specifications such as; budget, supply, continuity of finish, expected lifespan, ease for maintenance or replacement, indoor or outdoor, wet or dry conditions, possible contact with chemicals etc.

By considering each of these elements the right type of steel finish can be chosen to suit the required project. You can view our full range of threaded fasteners here or for further information advice contact our Sales team on: or [email protected].