Special screws

ADAPTATION OF STANDARD PARTS OR COMPLETE PRODUCTION – ALSO ON COMMISSION

If standard screws no longer meet your application’s demands, we will provide the appropriate special screws. We can also make numerous adjustments to standard parts:

  • Shortening the screw head or bolt length can be an option if a standard fastener would protrude out of the components to be fastened.
  • If design constraints do not leave enough space for a standard screw head, we can reduce the head diameter.
  • We can meet special safety requirements by inserting a groove in the thread or wire hole into bolts to prevent them from coming loose.

In the manufacture of special screws, we equip our CNC lathes manually to guarantee top precision and flexibility for your project.

Our customers either supply the feedstocks themselves, as most wholesalers do when we manufacture special screws on commission, or we can take care of the complete production, from blanks procurement to surface finishing, if they order finished products, as most plant or machine manufacturers do.

SPECIAL SCREWS FROM A WIDE VARIETY OF FEEDSTOCKS

We manufacture special screws from a broad range of starting products, including standard parts that we machine into special screws or blanks provided by our customers that we mill into finished fasteners.

Possible feedstocks

Different head shapes

  • Cap screws ISO 4762 (DIN 912), DIN 7984
  • Hexagon head screws ISO 4017 (DIN 933), ISO 4014 (DIN 931), DIN 7604
  • Countersunk head cap screw ISO 10642 (DIN 7991)
  • Slotted head screw ISO 1207 (DIN 84), cross head “Phillips” screws ISO 7046 (DIN 965), ISO 7045 (DIN 7985)
  • Wing screw DIN 316
  • Eye bolt DIN 444

Headless screws

  • Set screws ISO 4026 (DIN 913), DIN 976, DIN 551
  • Stud bolts
  • Double-threaded bolts

Numerous materials for special screws

  • Stainless steels A2 and A4 with the required strength gradations
  • Steel screws of the strength classes 3.6 to 12.9
  • Aluminium
  • Brass

Different head shapes

  • Cap screws ISO 4762 (DIN 912), DIN 7984
  • Hexagon head screws ISO 4017 (DIN 933), ISO 4014 (DIN 931), DIN 7604
  • Countersunk head cap screw ISO 10642 (DIN 7991)
  • Slotted head screw ISO 1207 (DIN 84), cross head “Phillips” screws ISO 7046 (DIN 965), ISO 7045 (DIN 7985)
  • Wing screw DIN 316
  • Eye bolt DIN 444

Headless screws

  • Set screws ISO 4026 (DIN 913), DIN 976, DIN 551
  • Stud bolts
  • Double-threaded bolts

Numerous materials for special screws

  • Stainless steels A2 and A4 with the required strength gradations
  • Steel screws of the strength classes 3.6 to 12.9
  • Aluminium
  • Brass

Depending on the product and order, the quantities we produce range from a single piece up to 30,000 pieces per order – in lengths between 5 and 300 millimetres and in diameters ranging from M2 to M30. Often, our customers also ask for product samples, which we are happy to manufacture in short production runs.

SPECIAL SCREWS MADE BY GISO MEIER – ALSO ON COMMISSION

We manufacture special screws primarily for machine and plant manufacturers. For wholesale customers, we also work as a reliable subcontractor for the contract manufacturing of special screws. Our flexibility also benefits screw wholesalers, whom we can supply with small series of urgently needed special screws at short notice.

Our customers entrust us with many different machining and finishing processes carried out on standard screws to get tailor-made special screws that meet their requirements.

PRODUCTION OF SPECIAL SCREWS IN NUMEROUS VARIANTS

Giso Meier is your go-to manufacturer for special screws. One of our strengths in this field is the reworking of standard screws from M2 to M30 into customer-specific special designs with a

  • thin shank
  • groove
  • sharp tip
  • undercut
  • shortened head or overall length
  • transverse or longitudinal hole
  • thin shank
  • groove
  • sharp tip
  • undercut
  • shortened head or overall length
  • transverse or longitudinal hole

THIN SHANK TURNING ACCORDING TO DIN 7964, DIN 2510 OR CUSTOMER SPECIFICATION

For thin shank screws, part of the thread under the screw head is turned or milled off. Consequently, thin shank screws have a much thinner diameter than the nominal diameter of the screw. Thin shank screws are screwed into the (threaded) mounting hole and are thus mounted in a captive manner. They can also be used to compensate for drill hole positions.

Thin shank screws include expansion screws, but the latter differ from the first in some respects: The transitions to the shank of the screw and to the threaded part are usually precisely defined, have a large radius, and set increased demands on the dimensional accuracy, the surface finish and the hardness of the screw.

THIN SHANK TURNING ACCORDING TO DIN 7964, DIN 2510 OR CUSTOMER SPECIFICATION

For thin shank screws, part of the thread under the screw head is turned or milled off. Consequently, thin shank screws have a much thinner diameter than the nominal diameter of the screw. Thin shank screws are screwed into the (threaded) mounting hole and are thus mounted in a captive manner. They can also be used to compensate for drill hole positions.

Thin shank screws include expansion screws, but the latter differ from the first in some respects: The transitions to the shank of the screw and to the threaded part are usually precisely defined, have a large radius, and set increased demands on the dimensional accuracy, the surface finish and the hardness of the screw.

TURNING DOG OR CONE POINTS – ISO 4753

Screws with SP points are used facilitate the positioning or the insertion into the screw hole.

TURNING DOG OR CONE POINTS – ISO 4753

Screws with SP points are used facilitate the positioning or the insertion into the screw hole.

THREAD ENDS – DIN 78

RN rounded ends or AK thrust points (e.g. according to DIN 6332) on a screw prevent the thread of the screw from being deformed or damaged by pressure during application. The pressure exerted by the screw is also reduced to a defined point.

THREAD ENDS – DIN 78

RN rounded ends or AK thrust points (e.g. according to DIN 6332) on a screw prevent the thread of the screw from being deformed or damaged by pressure during application. The pressure exerted by the screw is also reduced to a defined point.

TRANSVERSE HOLES IN THE THREAD AND HEAD AREAS – DIN 34803

Cross holes and split pin holes (DIN 34803) at the head or in the threaded part of the screw serve to mount split pins or to secure the bolt with wire.

TRANSVERSE HOLES IN THE THREAD AND HEAD AREAS – DIN 34803

Cross holes and split pin holes (DIN 34803) at the head or in the threaded part of the screw serve to mount split pins or to secure the bolt with wire.

GROOVE / UNDERCUT

Grooves provide space to insert lock washers or snap rings. Radius recesses are also possible – they serve to arrest or lock the movement of the screw or of the assembled component.

In order to ensure that the thread runs all the way to the head’s contact surface, it may prove necessary to make a thread undercut on the screw, for example according to DIN 76 or according to customer specifications.

GROOVE / UNDERCUT

Grooves provide space to insert lock washers or snap rings. Radius recesses are also possible – they serve to arrest or lock the movement of the screw or of the assembled component.

In order to ensure that the thread runs all the way to the head’s contact surface, it may prove necessary to make a thread undercut on the screw, for example according to DIN 76 or according to customer specifications.

MACHINING OF HEAD DIAMETER AND LENGTH

For special mounting cases, it may be necessary that the head diameter must be smaller than on standard screws. Just as well, there are use cases where the bolt head’s height must be reduced to prevent it from protruding from the component to be assembled, or if the design does not allow a higher bolt head.

MACHINING OF HEAD DIAMETER AND LENGTH

For special mounting cases, it may be necessary that the head diameter must be smaller than on standard screws. Just as well, there are use cases where the bolt head’s height must be reduced to prevent it from protruding from the component to be assembled, or if the design does not allow a higher bolt head.

SHORTENING OF SCREWS

By shortening screws below their standard length, we open up new areas of application, e.g., in designs with a limited overall height. Where components have to be screwed together without any protrusions, we can, for example, shorten both the screw head and the overall screw length.

SHORTENING OF SCREWS

By shortening screws below their standard length, we open up new areas of application, e.g., in designs with a limited overall height. Where components have to be screwed together without any protrusions, we can, for example, shorten both the screw head and the overall screw length.

ADDING A THREADED PIN

We can add a threaded pin to existing bolts. The threaded pin always has a smaller diameter than the nominal diameter of the machined bolt.

Threaded-stud

ADDING A THREADED PIN

We can add a threaded pin to existing bolts. The threaded pin always has a smaller diameter than the nominal diameter of the machined bolt.

LONGITUDINAL HOLES, WITH OR WITHOUT A THREAD

In bolts, a longitudinal bore hole as a blind or through hole serves to accommodate or guide another component or to release pressure. A threaded longitudinal hole can additionally be used as a fastening thread or as a movement thread for various special applications.

LONGITUDINAL HOLES, WITH OR WITHOUT A THREAD

In bolts, a longitudinal bore hole as a blind or through hole serves to accommodate or guide another component or to release pressure. A threaded longitudinal hole can additionally be used as a fastening thread or as a movement thread for various special applications.

DOUBLE-THREADED SCREWS

In this case, a pin with an external thread is attached to a bolt. It can serve as a space-saving mounting option for additional components or other purposes.
Another use case for double-threaded bolts is to fasten parts where one has a left thread and the other one has a right thread.

We also offer the machining of nuts. We can rework standard nuts into special nuts.

TOP QUALITY FROM YOUR PRECISION MECHANIC: MATCHING SPECIAL SCREWS MADE BY GISO MEIER

What distinguishes outstanding special screws? We pay attention to a several key characteristics to assure the quality of special screws:

  • dimensional accuracy
  • threadability
  • freedom from burrs – and, last, not least,
  • availability, which is particularly important for small series

We can advise our customers on the design and dimensioning of special fasteners. In most cases, our customers have their own design engineer. Sometimes our recommendations help to further improve the quality of the desired special screws or to reduce the costs of special screws. An example: Sometimes, thin shank screws provide the standard dimensions; this leaves grooves in the thread which we can eliminate by milling the screws a little thinner.