Screws for direct screwing into: sheet metal, metal laminates, alloys, plastic materials without tapping or using nuts.
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RECESS
deep to ensure secure matching with the screwdriver. A deep recess, of a perfect shape, enables he same insert to be used for thousands of screwing operations.
THREAD
up to below the head, to allow the gripping of extremely thin sheets.
TIP
threaded right to the end, to allow the screw to gradually deform the material, creating a “drawing” effect, which increases the grip on thin sheets.
CARBONITRIDING HEAT TREATMENT
More info: heat treatment
GALVANIC TREATMENT
The self-tapping screw are available in various treatments.
More info: finishing treatments
IN PROCESS CONTROLS
The entire manufacturing process is subjected to SPC (Statistical Product Control), which guarantees a constantly high level of quality in time.
The batch number on the labels ensures absolute traceability of all the phases of production and related control/test documents.
CALIBRATED SCREWS
The Mustadscrews are manufactured with stricter-than-standard tolerance limits. They can therefore be defined as ‘calibrated’, that is, capable of sliding more easily in the guides and loading tubes of screwing machines.
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- Deep recess to ensure secure matching with the screwdriver.
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- Diagram of the action of the tip of the Mustad self-tapping screw that creates the drawing effect, i.e. a deformation of the material that increases the gripping of thin sheets.
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- Section of the screw that shows the characteristics of the carbonitriding treatment.
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- Graph comparing a Mustad self-tapping screw with a traditional screw that demonstrates how the SPC process improves the average production quality and the tolerance.
Types of head
MUSHROOM HEAD
This shape of head combines the minimum height with a better surface of contact with respect to the normal pan head.
FLANGED MUSHROOM HEAD
This type of screw is used to:
– assemble very thin materials
– give a better aesthetic effect to the part assembled
– cover slotted holes with a larger diameter than the standard size of the pan head.
The flange may have various diameters according to the application to be performed.
SERRATED HEAD
These screws satisfy the need to obtain fixtures with higher vibration resistance, in that the recess made by the tightening of the screw produces an anti-loosening effect.
Recommended also to obtain ground contacts on electrical parts.
HEXAGONAL AND HEXAGONAL WITH COLLAR
Hexagonal-head self-tapping screws for applications that require a high tightening torque. In the version with a collar, it ensures an excellent distribution of the axial force, protecting the surface of the part to be assembled against contact with the tightening bush.
Head with captive washer
VISTOP®
These screws with a preassembled captive washer are manufactured with a pan head or hexagonal head. Their advantage lies in the simplification of assembly in mass production.
Smooth washer: for the gripping of very thin metal sheets or plastic without damaging the surface gripped, or to cover large slotted holes.
Serrated washer: to obtain connections with an extremely high vibration-resistance.
Types of recess
PHILLIPS ‘PH’ RECESS
The standard head for screws.
POZIDRIV ‘PZ’ RECESS
The particular shape of the recess and the larger number of points of contact between the head and the bit reduce the “come-out” effect and the wear of the bit itself.
‘TX’ SIX LOBE RECESS
Due to its vertical walls, it eliminates the ‘come-out’ effect.
‘TA’ TAMPER-PROOF
Indicated for applications in which unscrewing must be performed exclusively by qualified staff.
HEXAGONAL
Indicated where the application of high tightening torque is required.
HEXAGONAL WITH COLLAR
The collar increases the supporting surface, protecting the part from the action of the tightening bush at the same time.
‘TX’ SIX LOBE COMBI – SLOTTED RECESS
Combines the universal nature of the slotted recess with the characteristics of the six lobe recess.
COMBI CROSS – SLOTTED RECESS
Combines the universal nature of the slotted recess with the characteristics of cross recesss.
Types of thread
FULLY THREADED
The thread right to the head allows the gripping of extremely thin sheet metal.
PARTIALLY THREADED
When the hole in the part to be assembled is sized correctly, the screw becomes captive, increasing also the resistant section at the joining point.
THIN SHEET METAL THREAD
These screws allow high tightening torques to be applied and thus effective gripping, in sheets with a thickness of ≤ 1 mm as the special tip and close threads, produce a drawing effect on the sheet, increasing the number of threads gripped.
Types of tip
STANDARD
Threaded right to the end to allow the screw to deform the material gradually, creating a ‘drawing’ effect, which increases the grip on thin sheets.
FLAT
BZ type with gradual entry which facilitates entry in the hole and reduces the risk of injuries during the assembly, handling and maintenance of the part assembled.
TRUNCATED SCREW
As it has no gradual entry, it guarantees the grip of the material into which it is screwed right from the start of the shank.
PILOT
The unthreaded conical section favours the alignment of the parts to be assembled, even in the presence of offset holes.
ROUNDED
Used through holes on complexes subject to subsequent handling by operators.