SDS-Max Extensions & Adaptors
ITM SDS-Max and spline extensions from 12-1/2" to 82-1/2", plus an X-Tendr adapter and an SDS-Max to SDS-Plus adapter. For reaching deeper with a rotary hammer or changing bit shank size.
Choosing an extension or adaptor
Extensions add reach when a bit is too short for the hole, such as drilling down through a deep slab or reaching overhead from a safe stance. The range is ITM: SDS-Max extensions at 12-1/2", 30", 44" and 82-1/2", spline extensions at 12-1/2" and 30", an X-Tendr Adapter and an SDS-Max to SDS-Plus Adapter.
Matching and using them
Match the shank first. SDS-Max and spline are different, so pick the extension that fits your rotary hammer and the bit you are running. An extension adds length, which adds flex. Keep the tool square to the work, use moderate pressure and back out to clear dust more often than with a short bit.
The SDS-Max to SDS-Plus Adapter lets you run an SDS-Plus bit in an SDS-Max tool. For the bits themselves, see SDS-Max drill bits.
Free shipping on orders over $200. Trade accounts can reorder in a click from My Toolbox, or call (833) 438-6657.
Common questions
What is the difference between SDS-Max and spline extensions?
They have different shanks and fit different rotary hammers. SDS-Max extensions fit SDS-Max tools. Spline extensions fit tools with the spline shank. Check your hammer before you order.
How long an extension can I get?
SDS-Max extensions are listed at 12-1/2", 30", 44" and 82-1/2". Spline extensions come in 12-1/2" and 30".
Can I run SDS-Plus bits in my SDS-Max hammer?
Yes, with the SDS-Max to SDS-Plus Adapter in this collection. Check the product page for details before you order, and make sure the bit suits your hammer.
Know-how for SDS-Max Extensions & Adaptors
All guides →
Buying for a crew?
Call 833-438-6657, 8 AM to 4 PM MST. We know the parts, not just the part numbers.