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STJ-PS4-400 soft insert jaws
STJ-PS4-400 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 400 mm for 4-jaw chucks type PS. In the Krollit catalog since 2007 as an official Bernardo distributor.
Logistics
Original spare parts available with 3–5 business days shipping. Customer service in Italian available.
Technical specifications
Technical Specifications
Chuck size |
400 mm |
A |
140 mm |
B |
42 mm |
C |
64.5 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 |
M16 |
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 400 mm — how do they differ from soft monolithic jaws?
Soft top jaws combine the top jaw construction (hardened base body + replaceable soft top insert) with the non-hardened mild steel insert. Compared to monolithic soft jaws: the soft inserts are replaced separately when worn or overly machined, without changing the base body. Compared to reversible hardened top jaws: the soft inserts allow for in-situ machining for maximum concentricity on delicate workpieces.
For Ø 400 mm — when is it necessary to machine (bore) 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 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); STJ reversible top jaws can have soft inserts mounted in both orientations. Check the specifications of the specific model. Customer service in Italian available.
Delivery times?
Original spare parts available with 3–5 business days shipping. Customer service in Italian available.
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