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STJ-PS4-250 soft insert brake shoes
STJ-PS4-250 soft insert brake shoes is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
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 250 mm for 4-jaw chucks type PS. Distributed in Italy by Krollit — official Bernardo distributor since 2007.
Logistics
Original spare parts available with 3–5 working days shipping. Customer support in Italian available.
Technical specifications
technical specifications
Chuck size |
250 mm |
A |
106 mm |
B |
32.5 mm |
C |
51.5 mm |
d |
12.71 mm |
E |
27.5 mm |
F |
54 mm |
G |
19.04 mm |
h |
45 mm |
l |
3.2 mm |
J |
4 mm |
Bolt size |
M12 |
Warranty
Warranty terms and support procedures are available on the dedicated Krollit page.
View Krollit warranty termsFAQ / Frequently asked questions
Frequently asked questions
Soft top jaws Ø 250 mm — what distinguishes them from monoblock soft jaws?
Soft top jaws combine the top jaw construction (hardened base body + replaceable soft top insert) with a non-hardened mild steel insert. Compared to monoblock soft jaws: soft inserts are replaced separately when worn or overly machined, without changing the base body. Compared to reversible hardened top jaws: soft inserts allow for in-situ turning for maximum concentricity on delicate workpieces.
For Ø 250 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 clamping pressure is changed, or eccentricity is noted in the workpiece. For machining workpieces requiring concentricity better than 0.05 mm, in-situ boring is indispensable — it reduces runout to the physically achievable minimum with the chuck in use.
Can 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 mounted in both orientations. Check the specific model's specifications. Customer support in Italian available.
Delivery times?
Original spare parts available with 3–5 working days shipping. Customer support in Italian available.
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