Bolts and screws

DIN and ISO bolts and screws for machine assembly and servicing

Selecting a bolt or screw starts with the connection documentation. Besides nominal diameter, length, thread pitch, head geometry and material properties are important. At NERON, you can go to a specific group by standard designation or version. DIN and ISO designations help find products, but when substituting one designation for another, compare the dimensions and parameters of the particular version.

Hexagon heads and thread length

DIN 933 bolts are threaded along the full shank length, while DIN 931 versions have an unthreaded section. Select the thread length for the thickness of the joined parts and engagement with the nut or threaded hole. Separate fine-thread groups include DIN 960 and DIN 961. Matching diameter alone does not confirm matching pitch.

Hexagon socket screws and countersunk heads

Compare ISO 4762 socket head cap screws, DIN 7991 countersunk screws and ISO 7380 button head screws. Head shape affects seating and the space required. Where height is limited, check the appropriate low-head version; do not assume it has the same load-carrying capacity as another head type.

Shoulder bolts, eye bolts and other versions

For connections requiring specific shank geometry, see ISO 7379 and DIN 609. The catalogue also includes thumb screws, DIN 444 eye bolts, DIN 603 carriage bolts, DIN 939 studs, hammer-head bolts and hanger bolts. The component’s function and permissible application are confirmed by the documentation for the specific product.

Material, class and mating components

Material, strength class and coating are separate features. Establish their requirements from the design and operating conditions. Also compare nuts and washers. In an enquiry, provide the standard, diameter, length, pitch, version and quantity. Check the sales unit before ordering.

Questions about bolt and screw selection

Does a bolt with the same diameter always fit a nut?

No. Thread type and pitch must match. The other assembly parameters must also meet the connection requirements.

Can DIN and ISO be treated as identical designations?

Compare product drawings and specifications. Equivalents listed in catalogues may require checking for differences in dimensions or version ranges.

How do I select a bolt or screw without a known code?

Prepare dimensions, a photograph of the head and markings, thread pitch and an application description. These help narrow the selection, but compatibility must be confirmed before use.

Bolts and screws from NERON Piła

Send enquiries for bolts and screws for workshop work, assembly and maintenance to NERON, ul. Wybickiego 17, 64-920 Piła. Provide the complete specification and quantity to help establish the version and availability.