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Bernardo  |  SKU: 21-3267

STJ-PS4-630 soft insert jaws

€1.688,30 (22% VAT incl.)
Business solution up to 30 installments

Delivery and Shipping

At Krollit, we guarantee a safe and reliable shipping process. Orders are handled with the utmost care and traceability until delivery.

For international shipments, please send your request via the dedicated contact form.

Upon delivery, always sign the delivery note with the words “subject to inspection” to allow for proper handling of any irregularities or discrepancies in the product.

Our goal is to ensure you receive prompt service and a worry-free shopping experience.

Description

Soft top jaws Ø 630 mm for PS type 4-jaw chucks. Distributed in Italy by Krollit — official Bernardo distributor since 2007.

Technical specifications

Chuck size

630 mm

A

160 mm

B

52 mm

C

82 mm

d

12.71 mm

E

34.4 mm

F

76.2 mm

G

19.04 mm

h

63 mm

l

6.3 mm

J

4 mm

Bolt size

M20

Logistics

Original spare parts available with 3-5 working day shipping. Customer service in Italian available.

Frequently asked questions

Soft top jaws Ø 630 mm — what distinguishes them from monoblock soft jaws?

Soft top jaws combine the top jaw construction (hardened base body + replaceable soft top insert) with the unhardened mild steel insert. Compared to monoblock soft jaws: the soft inserts are replaced separately when worn or when over-machined, without changing the base body. Compared to reversible hardened top jaws: the soft inserts allow in-situ turning for maximum concentricity on delicate workpieces.

For Ø 630 mm — when is it necessary to turn (bore) the soft inserts in situ?

In-situ boring of soft inserts is necessary whenever: new inserts are mounted, the chuck's clamping pressure is changed, or eccentricity is noticed in the workpiece. For machining parts that require concentricity better than 0.05 mm, in-situ boring is indispensable — it reduces runout to the minimum physically achievable with the chuck in use.

Can the soft inserts be reversed for internal/external gripping?

It depends on the model: DSTJ jaws have non-reversible soft inserts (internal grip only or external grip only); reversible STJ top jaws can have soft inserts mountable in both orientations. Check the specific model's specifications. Customer service in Italian available.

Delivery times?

Original spare parts available with 3-5 working day shipping. Customer service in Italian available.

Product safety

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