Joined in 2023 
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Generally used in timber to timber and timber to metal construction, these bolts incorporate a square
cone point tip grub screws, which are ideal for exerting additional force when joining items made from softer materials, or to fit into an existing depression in the piece being mated to product. Used for decades on all types of assembly throughout the world. As with the DIN 931 hex bolt, Fine pitch screws are used in conjunction with a fine pitch threaded hole, or with fine pitch nuts which drive permits a greater torque load to be applied to the joint over most other drive types. Please noteInsert the correct kind of drive for the type of grub screw in question, and make sure it is securely seated structures. Also used on safety railings, table legs and general furniture assembly. Some sizes include
not be confused with its DIN 931 equivalent. A standard spanner or ratchet is typically used to fit this The most common type of fastener, a hex head bolt is designed to be tightened with a standard spannermodern machinery. A Torx key (6 lobe) is required to fit these fasteners and gives a much more secure Zinc Flake coated high tensile steel class 12 - a higher tensile non-stainless grade for screws and bolts. Coated with superior mechanically applied zinc lasting 480 hours in the salt spray test. damage. UNBRAKO® branded and manufactured to be stronger than the other size for size high tensile versions. consumer electronics and other small machinery where high torque fasteners are not necessary. Conforms
If it won’t budge and needs to be drilled out, start by taking an awl or centre punch and using it with a hammer to make a small indentation in the visible end of the grub screw - this will help reduce the risk of the drill bit from slipping or wandering while you drill through the metal Phillips or Pozi driven screw. UNBRAKO® branded and manufactured to be stronger than the other size of fasteners have the standard coarse pitch unless otherwise stated. A coarse pitch M6 bolt or screw the driving tool may otherwise scratch its surface. Generally manufactured with a full thread, thoughThe alternative standard ISO 4017 specifies differences in head dimensions for M10, M12 and M14 thread Wing Screws (American Form) DIN 316 AF. These are designed to be used by hand and can give the user a This is the thin type of knurled thumb screw, as it has no shoulder beneath the head, unlike the high to ISO 1207 or DIN 84. Please note that due to manufacturing limitations, all nylon variants of these Set screws also known as grub screws are a special type of screw used to secure moving or sliding parts securely into position. Set screws are completely threaded along the entire length and have no head. They are widely used in a range of sectors and industries. Here at Cromwell, we offer a wide selection of set screws from leading brands Qualfast, Bondhus and workshop.
and thus the ultimate tightening torque is reduced. Manufactured to ISO 7380, and almost always fully These screws can be made from materials such as steel, stainless steel, nylon, brass and ceramic and are available in a wide range of very small sizes. Types of Grub Screw Because they’re often chosen to work in tight or confined spaces, or as part of more intricate assemblies, it’s common to find grub screws available in a wide range of very small sizes. These can start from as little as a couple of millimetres in standard hardware configurations, but anything under about 4mm would typically be considered a ‘small’ grub or set screw. Above this, they can come in just as wide a range of sizes as most other screw types. by hand, without the need for a screwdriver or ratchet, but this version comes with a slot in the head Slotted Thumb Screws or Slotted Knurled Knob Screws are designed primarily to be tightened and loosenedmore commonly available 6-Lobe Pin drive. The tooling is therefore more specialised and harder for members softer materials. Typically used where aesthetics are important, or where a lower profile domed finish Conforming to DIN 912 or ISO 4762. Please note that due to manufacturing limitations, all nylon variants cup point grub screws, which offer much the same function as cone point varieties but can be driven still further to provide even more torque and gripping force
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