Dowels are solid pins, usually precision ground to narrow limits to permit accurate fitting.
Tolerance and Fits
Dowels are normally precision ground to produce a close tolerance diameter. The tolerance to which a dowel is ground is not directly related to the fit.
Fitting Dowels into Blind Holes
When a dowel is interference-fitted into a blind hole, it increases the pressure of the air trapped in the hole. It is strongly advised to specify that the dowel should have an air release flat ground along its full length.
The material specifications of our standard range is:
Through Hardened Steel:100Cr6,WS 1.3505 Hardened & Tempered to HV 550-650
Our standard range of plain taper pins is made to DIN 1B, and we also offer extractable taper pins to DIN 7978. In the DIN standard the nominal diameter is always the small end and the taper is 2% (1 in 50).
We supply good to the following standards: DIN 1B: Plain taper pin with turned finish (surface roughness of 3.2 microns)
DIN 7978: Extractable taper pin with female thread.
Slotted Spring Pins
Slotted Spring Pins consist of a single coil of spring steel (or stainless steel) with an open slot sufficiently wide to enable the pin to reduce in diameter as it is driven into a hole of appropriate size. The ends of the pin have a bevelled chamfer. They are designed for plain drilled holes but a countersink makes assembly easier, especially for the ISO 8752 type. Slotted pins are supplied in the heavy duty form to ISO 8752.
Stainless Steel A2
ISO 8752: Heavy Duty
Slotted spring pins are supplied in plain oil finish. Steel pins may be given a protective finish such as zinc or phosphate, but care is needed to prevent the open ISO 8752 entangling in barrel plating processes.
Threaded inserts are used in plastics, wood and non-ferrous metals to provide a thread that is stronger than would be possible by inserting a self-tapping screw directly into the material.
Self Tapping Inserts
Self-tapping inserts are the most universal type as they can be used in the widest range of materials and have a high resistance to pull-out. They can be inserted into drilled or moulded holes manually using a threaded mandrel, by the use of a tapping head mounted on a pillar drill, or by using automatic tapping machines.
The hole size is critical to the successful use of inserts. For each type of insert a specified hole size is given, but it should be understood that the lower end of the tolerance range is only applicable when the inserts is to be installed in softer materials. For hardwood, hard plastics or aluminium, the top end of the range should be used.
This range of self tapping inserts are supplied with a fine external thread for use in harder materials.
It is designed for use in aluminium and other non-ferrous metals, as well as plastics and thermosetting resins.
The insert must always be inserted slotted end first, as the slot provides the cutting action to tap into the materials for which the insert is intended.
Case hardened steel (plated zinc and yellow passivated)
Stainless steel grade 303
Chrome stainless 1.4104
Material: C45K Steel, DIN 6885A.
Material: C45K Steel, DIN 6888 / ISO 3912.
Standard and custom made Precision Shoulder Screws are available in 303 & 416 Grade Stainless Steel and Hardened Steel materials, in a wide range of diameters and lengths.
Socket Head Cap Screws
Standard and custom madeSocket Head Cap Screws are available in 12.9 Quality DIN 912 Steel and DIN 912.A2 Stainless Steel materials, in a wide range of diameters and lengths.
Socket Head Countersunk Screws
Standard and custom made Socket Head Countersunk Screws are available in Stainless Steel Grade A2-70 DIN7991 material, in a wide range of diameters and lengths.
Standard and custom made Socket Head Button Screws are available in Stainless Steel Grade A2 material, in a wide range of diameters and lengths.
Hexagon Socket Set Screws
Standard and custom made Hexagon Socket Set Screws, Grub Screws, are available in Stainless Steel DIN 916-A2 and Steel DIN 916 materials, in a wide range of diameters and lengths.
Standard and custom made Threaded Pillars, Threaded Bars, Steel Pressure Plugs & Grease Nipples, are available in wide range of sizes and lengths.