Screws for grating and fence fastenings: cup square bolts with a square neck, hexagon screws DIN 933 / ISO 4017, countersunk screws DIN 7991 / ISO 10642 and cylinder screws DIN 84 / ISO 1207 and DIN 912 / ISO 4762. Available in M8, hot-dip galvanized or Geomet-coated, in property classes 4.8 and 8.8. Further threads and lengths on request — B2B terms from a fastening specialist since 1943, shipped from stock in Germany.
CUP SQUARE BOLT, M8x70, hot-dip galvanized
Cup square bolt with slot, M8x70, steel, property class 4.8, fully threaded, hot-dip galvanized
Content: 1 piece (€92.127400 / 100 piece)
DIN 7991 / ISO 10642, M8x60, fully threaded, steel 8.8, Geomet-coated
Hexagon socket countersunk screw M8x60, fully threaded, steel, property class 8.8, Geomet-coated
Content: 1 piece (€57.986300 / 100 piece)
DIN 84 / ISO 1207, M8x70, steel 4.8, hot-dip galvanized
Slotted cheese head screw M8x70, steel, property class 4.8, fully threaded, hot-dip galvanized
Content: 1 piece (€68.726300 / 100 piece)
DIN 933 / ISO 4017, M8x50, fully threaded, steel 8.8, hot-dip galvanized
Hexagon head screws M8x50, fully threaded, steel, property class 8.8, hot-dip galvanized
Content: 1 piece (€14.000000 / 100 piece)
DIN 933 / ISO 4017, M8x70, fully threaded, steel 4.8, hot-dip galvanized
Hexagon head screws M8x70, fully threaded, steel, property class 4.8, hot-dip galvanized
Content: 1 piece (€55.621600 / 100 piece)
Hexagon socket head cap screw DIN 912 / ISO 4762, M8x70, Geomet-coated
Hexagon socket head cap screw M8x70, fully threaded, Geomet-coated
Content: 1 piece (€209.380500 / 100 piece)
Choosing a screw for a grating or fence fastening
In a grating fastening the head decides, not the strength class: it has to match the mesh and must not turn with the nut. The head shapes in this category answer different situations.
Cup square bolt
The square neck under the head locks into the part and holds the bolt while the nut is tightened, so the nut can be set single-handed. It is the screw used in the pre-assembled fastener sets, combined with a DIN 557 square nut.
Hexagon screw DIN 933 / ISO 4017
Full thread up to the head, so the clamping length is yours to choose.
Countersunk screw DIN 7991 / ISO 10642
The head disappears into the countersink and nothing stands above the surface — for places where nothing may protrude.
Cylinder screws DIN 84 / ISO 1207 and DIN 912 / ISO 4762
A slim head with a slot (DIN 84) or a hexagon socket (DIN 912) — useful where a spanner cannot reach.
Screw, nut and coating belong together
The zinc layer of a hot-dip galvanized screw needs room: the mating nut thread is tapped oversize to take it. A hot-dip galvanized screw therefore belongs with a hot-dip galvanized nut, not with an untreated or differently coated one. Matching square nuts DIN 557 and washers ISO 7089 are listed alongside.
Dimensions and ordering
The items in this category are M8, in lengths of 50, 60 and 70 mm, in property classes 4.8 and 8.8. ARNELL has supplied fastening technology since 1943 and ships from stock in Germany on B2B terms.
Related: nuts · washers · grating fastener parts · tap drill size chart
Frequently asked questions
Which threads and dimensions are in stock?
ARNELL's available screw range is built around M8 – the thread used by the grating and fence fastenings. Further threads, lengths and custom dimensions are supplied on request.
Which head shapes are available?
Cup square bolt with square neck, hexagon screw DIN 933 / ISO 4017, countersunk screw DIN 7991 / ISO 10642, and cylinder screws DIN 84 / ISO 1207 with slot and DIN 912 / ISO 4762 with hexagon socket.
Why use a cup square bolt in a grating fastening?
The square neck under the head sits form-fitted and holds the bolt while the nut is tightened, so the installation can be done with one hand. In the pre-assembled fastener sets it is combined with a DIN 557 square nut.
Hot-dip galvanized or Geomet – what is the difference?
Hot-dip galvanizing to DIN EN ISO 10684 forms a metallurgically bonded zinc layer of typically 45 to 85 µm and is the robust standard for outdoor use. Geomet is a thin zinc flake coating, more dimensionally accurate and without the risk of hydrogen embrittlement on high-strength screws.
Do the DIN and ISO numbers describe the same screw?
Yes. The DIN numbers have largely been withdrawn and the ISO standards apply; dimensions and head shape are identical. DIN 933 = ISO 4017, DIN 7991 = ISO 10642, DIN 84 = ISO 1207, DIN 912 = ISO 4762.