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STJ-PS4-500 soft insert jaws
STJ-PS4-500 soft insert jaws 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 500 mm for 4-jaw chucks type PS. Available from Krollit, official Bernardo distributor since 2007.
Logistics
Original spare parts available with 3–5 working day shipping. Customer support available in Italian.
Technical specifications
Technical specifications
Chuck size |
500 mm |
A |
140 mm |
B |
42 mm |
C |
74.5 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 |
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 500 mm — how do they differ from one-piece soft jaws?
Soft top jaws combine the top jaw design (hardened base body + replaceable soft top insert) with the non-hardened mild steel insert. Compared to one-piece soft jaws: soft inserts are replaced separately when worn or when too much turning is done, without changing the base body. Compared to reversible hardened top jaws: soft inserts allow in-situ turning for maximum concentricity on delicate workpieces.
For Ø 500 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, eccentricity is noticed in the workpiece. For machining parts that require better concentricity than 0.05 mm, in-situ boring is essential — it reduces runout to the minimum physically achievable 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); STJ reversible top jaws can have soft inserts mounted in both orientations. Check the specifications for the specific model. Customer support is available in Italian.
Delivery times?
Original spare parts available with 3–5 working day shipping. Customer support available in Italian.
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