
Στις περισσότερες
κατασκευές, το «κλασικό» μυαλό πάει σε σταυροκατσάβιδο και απλές βίδες. Όμως σε
πιο απαιτητικές εφαρμογές –μηχανουργεία, μεταλλικές κατασκευές, αυτοματισμούς,
βαριά έπιπλα, βιομηχανικά μηχανήματα– οι βίδες Allen και οι εξαγωνικές βίδες είναι
συχνά μονόδρομος.
Στο kamtsis.com θα βρείτε μεγάλη γκάμα σε βίδες άλλεν, ατσαλόβιδες άλλεν ανοξ. και βίδες
εξάγωνες ανοξ., με επιλογή σε πάχος (Φ) και μήκος, ώστε να
καλύπτονται και ελαφριές και βαριές εφαρμογές.
Ας δούμε σε ποιες
περιπτώσεις αυτές οι βίδες «κερδίζουν» ξεκάθαρα τις κλασικές.
Τι είναι οι βίδες Allen και οι εξαγωνικές βίδες
Οι βίδες Allen έχουν εσωτερική εξάγωνη υποδοχή στο
κεφάλι τους και βιδώνουν με κλειδί Allen (εξάγωνο κλειδί). Κυκλοφορούν σε απλές ατσαλόβιδες και σε ανοξείδωτη (Inox) εκδοχή, όταν απαιτείται αντοχή σε διάβρωση.
Οι εξαγωνικές
βίδες έχουν εξωτερικό εξαγωνικό κεφάλι και σφίγγονται με γερμανικό ή
καρυδάκι. Είναι κλασική επιλογή σε μηχανικές συνδέσεις, μεταλλικά πλαίσια,
φλάντζες κ.λπ.
Σε σχέση με τις
απλές «σταυροκατσάβιδες» βίδες, και οι δύο τύποι προσφέρουν:
- δυνατότητα
εφαρμογής μεγαλύτερης ροπής,
- καλύτερο
έλεγχο στο σφίξιμο,
- λιγότερες φθορές στο κεφάλι της
βίδας,
- μεγαλύτερη αξιοπιστία σε
επαναλαμβανόμενα σφιξίματα/λυσίματα.
Πλεονέκτημα σε ροπή και ασφάλεια
σύσφιξης
Κύριο πλεονέκτημα
των Allen και εξαγωνικών
βιδών είναι ότι δέχονται πολύ μεγαλύτερη ροπή από ένα απλό
κατσαβιδόβιδο.
Η εσωτερική ή
εξωτερική εξάγωνη επιφάνεια:
- «αγκαλιάζει»
καλύτερα το εργαλείο,
- μειώνει την πιθανότητα να
«γλιστρήσει» το κλειδί,
- επιτρέπει ασφαλές σφίξιμο χωρίς να
καταστρέφεται η κεφαλή.
Γι’ αυτό είναι η
πρώτη επιλογή σε συνδέσεις όπου:
- υπάρχουν δονήσεις (μηχανές,
κινητήρες, βιομηχανικά μηχανήματα),
- απαιτείται σταθερό σφίξιμο για μεγάλο
διάστημα,
- το λύσιμο/δέσιμο γίνεται συχνά για
συντήρηση.
Λύσεις για περιορισμένο χώρο
Σε πολλές
εφαρμογές, το κεφάλι μιας κλασικής βίδας «πετάει» πολύ προς τα έξω και δεν
υπάρχει χώρος για εργαλείο.
Οι βίδες Allen με κυλινδρικό ή φρεζάτο κεφάλι:
- χωράνε
σε περιορισμένες θέσεις,
- επιτρέπουν σφίξιμο με απλό κλειδί Allen χωρίς όγκο εργαλείου,
- προσφέρουν πιο «καθαρή» εικόνα σε
μηχανήματα, μεταλλικά έπιπλα, κατασκευές ακριβείας.
Είναι ιδανικές για:
- μηχανισμούς οδηγών, κινούμενα μέρη,
βάσεις μοτέρ,
- μεταλλικές κατασκευές όπου δεν
περισσεύει χώρος για γερμανικό/καρυδάκι,
- εφαρμογές όπου θέλουμε κεφάλι χαμηλού
προφίλ για να μη βρίσκει κάπου.
Ανοξείδωτες Allen & εξαγωνικές: όταν η διάβρωση είναι
εχθρός
Σε εξωτερικούς
χώρους, παραθαλάσσιες περιοχές, υγρό περιβάλλον ή εφαρμογές με επαφή σε νερό,
τα απλά γαλβανιζέ στοιχεία με τον χρόνο φθείρονται.
Εκεί κερδίζουν οι
Allen Inox και οι εξαγωνικές ανοξείδωτες βίδες:
- δεν
σκουριάζουν εύκολα,
- δεν «κολλάνε» τόσο στις σπείρες,
- διατηρούν την αισθητική της
κατασκευής (κάγκελα, ανοξείδωτες βάσεις, εξωτερικές μηχανές).
Είναι κατάλληλες για:
- ανοξείδωτα
κάγκελα και στηρίγματα,
- εξωτερικά
μεταλλικά πλαίσια,
- εφαρμογές σε ναυτιλία ή κοντά σε
θάλασσα,
- χώρους με αυξημένη υγρασία ή χημικές
ουσίες.
Αισθητική και «καθαρή» εμφάνιση
Σε έπιπλα,
μεταλλικές κατασκευές design,
εμφανείς συνδέσεις σε σκάλες, κάγκελα ή ειδικές κατασκευές, η επιλογή Allen ή εξαγωνικής βίδας δίνει συχνά πιο
«τεχνική» και προσεγμένη εικόνα.
- Το κεφάλι τους έχει συμμετρία,
- διατίθενται σε συγκεκριμένα πάχη
(Φ) και μήκη,
- μπορούν να συνδυαστούν με κατάλληλες
ροδέλες (απλές ή ανοξείδωτες) για πλήρως φινιρισμένη εμφάνιση.
Έτσι, η στερέωση
δεν είναι απλώς λειτουργική, αλλά και κομμάτι της αισθητικής της κατασκευής.
Πώς βοηθούν τα φίλτρα του kamtsis.com στην επιλογή
Στο e-shop μπορείς να φιλτράρεις:
- ΒΙΔΕΣ ΑΛΛΕΝ ανά πάχος (π.χ. 4–20 mm) και μήκος (από 6 mm έως 200 mm),
- ΑΤΣΑΛΟΒΙΔΕΣ ΑΛΛΕΝ ΑΝΟΞ. με συγκεκριμένα πάχη (3–10 mm) και μήκη (3–70 mm),
- ΒΙΔΕΣ ΕΞΑΓΩΝΕΣ ΑΝΟΞ. με επιλογή σε πάχος και μήκος για να
δέσουν με παξιμάδια, ροδέλες και τα υπόλοιπα στοιχεία σύνδεσης.
Ξεκινάς από:
- το υλικό που θα δέσεις,
- τον
χώρο (εσωτερικό–εξωτερικό),
- το αν θες απλό ατσάλι ή inox,
και στη συνέχεια, μέσω των φίλτρων, βρίσκεις τις διαστάσεις που «κουμπώνουν» ακριβώς στην εφαρμογή σου.
Οι βίδες Allen, οι Allen Inox και οι εξαγωνικές
βίδες δεν είναι υπερβολή – είναι εργαλείο αξιοπιστίας. Προσφέρουν μεγαλύτερη
ροπή σύσφιξης, καλύτερο έλεγχο, αντοχή σε φορτία και σε διάβρωση, καθώς και πιο
καθαρή εικόνα στην κατασκευή.
Όταν η εφαρμογή
είναι σοβαρή – είτε πρόκειται για μηχανουργείο, είτε για μεταλλική κατασκευή,
είτε για εξωτερική χρήση – η επιλογή τους έναντι μιας απλής «σταυροκατσάβιδης»
βίδας κάνει τη διαφορά τόσο στην αντοχή όσο και στο επαγγελματικό αποτέλεσμα.
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