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TJ-PS4-250 reversible insert jaws
TJ-PS4-250 reversible 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
Reversible top jaws Ø 250 mm for PS type 4-jaw chucks. Available from Krollit, official Bernardo distributor since 2007.
Logistics
Original spare parts available with 3-5 business day shipping. Customer support available in Italian.
Technical specifications
Technical Specifications
Chuck size |
250 mm |
M |
27 mm |
h |
39.7 mm |
G |
19.04 mm |
L |
14.5 mm |
J |
14 mm |
K |
20 mm |
d |
12.71 mm |
E |
4 mm |
F |
3.2 mm |
R |
22 mm |
N |
13.5 mm |
C |
53 mm |
B |
32.5 mm |
A |
95 mm |
O |
29 mm |
P |
64 mm |
Warranty
Warranty terms and support procedures are available on the dedicated Krollit page.
View Krollit warranty termsFAQ / Frequently asked questions
Frequently Asked Questions
Reversible top jaws Ø 250 mm — what do "top jaw" and "reversible" mean?
"Top jaw" indicates that the jaw consists of two parts: the base body (hard, made of hardened steel) that moves in the chuck's guides, and the upper insert (the actual jaw, made of soft or hardened steel) screwed onto the base body. The inserts can be replaced separately when worn without changing the base body. "Reversible" indicates that the same insert can be mounted in two opposite orientations — for internal or external gripping — without changing the jaw.
For Ø 250 mm — what is the clamping diameter range with these jaws?
The reversible top jaws for a Ø 250 mm chuck clamp workpieces within a diameter range that depends on the jaw stroke and the mounted configuration. As a general reference, the jaws cover a range of approximately ±30–40% of the nominal chuck diameter. For very small diameters (workpieces <Ø 20 mm on a Ø 250 mm chuck), consider smaller jaws or workpiece clamps. Customer support available in Italian.
Can the top inserts be replaced separately?
Yes — this is the main advantage of the top jaw construction. When the upper inserts are worn or when you want to mount inserts made of a different material (e.g., soft inserts for delicate workpieces), you remove the fastening screws and replace only the inserts without having to buy the complete set of jaws. Replacement inserts are available separately. Customer support available in Italian.
Delivery times?
Original spare parts available with 3-5 business day shipping. Customer support available in Italian.
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Product safety
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