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STJ-PS3-315 (21-3244) soft insert jaws
STJ-PS3-315 (21-3244) 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 ? mm for 3-jaw chucks type PS. Krollit has been the official Bernardo distributor in Italy since 2007.
Logistics
Original spare parts available with 3–5 working day shipping. Customer support in Italian available.
Technical specifications
Technical specifications
Chuck size |
315 mm |
A |
120 mm |
B |
37 mm |
C |
55 mm |
d |
12.71 mm |
E |
30.7 mm |
F |
63.5 mm |
G |
19.04 mm |
h |
53 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 ? mm — how do they differ from soft monolithic jaws?
Soft top jaws combine the top jaw construction (hardened master jaw + replaceable soft top insert) with the non-hardened mild steel insert. Compared to soft monolithic jaws: soft inserts are replaced separately when worn or overly machined, without changing the master jaw. Compared to hardened reversible top jaws: soft inserts allow for in-situ machining for maximum concentricity on delicate workpieces.
For Ø ? mm — when is it necessary to machine (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 requiring concentricity better than 0.05 mm, in-situ boring is essential — 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 specifications for the specific model. Customer support in Italian available.
Delivery times?
Original spare parts available with 3–5 working day shipping. Customer support in Italian available.
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