CNC Machined 550/650 Toolheads

For Dillon 550 and 650 Presses

By Whidden Gunworks


The toolhead is the final link between your dies and your press so it only makes sense that quality is extremely important. With over $100.00 of dies, powder measure, and other accessories mounted in your toolhead, don’t you want to know it’s the best available!

Tighter Tolerances
These toolheads are made to the highest standards by Whidden Gunworks. All critical machining is done on one operation, yielding tolerances of 0.0002" on all critical dimensions. This means that all die mounting holes are positioned precisely relative to each other and are exactly perpendicular to the flange. The flange is also flatter than possible with a cast toolhead. The 7/8"-14 die mounting threads are machined to Class 2B tolerance to better mate with the threads on your dies. This results in the dies being more accurately centered in each hole and reduces offset when tightening the die locknut.

6061-T6 Aluminum Alloy
The toolheads are machined from 6061-T6 aluminum alloy. The T6 tempering process yields an ultimate tensile strength of at least 42,000 psi. The result is a toolhead that is about 50% lighter than a cast toolhead, but also much stronger. These toolheads are thinner but have no voids or cavities on the bottom.

Locator Pins or Clamped?
These toolheads are available in either the standard form or with the UniqueTek Toolhead Clamp Kit™ parts pre-installed. The standard toolheads mount in the press using the locator pins, just as any original Dillon toolhead. The Clamped toolheads mount with Grade 8 alloy screws that come with the toolhead. You can read more details about the benefits of clamped toolheads on the product page for the UniqueTek Toolhead Clamp Kit™.*

Here is what customers have to say about the CNC Machined Toolheads:

"I am delighted wit he 650 toolhead and have ordered them previously. Quality and precision are excellent. They are the only toolheads we use. No Dillon's. We also use your powder baffles and look forward to trying more of your innovative products."
Best regards,
Brian S. – Morocco, IN

"I recently purchased a machined tool head with a clamp kit installed for my 550B press. I have the clamp kit components installed on factory cast tool heads, and found the kit to be an excellent addition. Having a machined tool head with the clamp kit installed sounded like something I wanted to try. I bought one tool head to test out, and I am very impressed with the results. I setup the tool head for 9mm loading, and the finished product is some the best ammunition I have loaded to date, and I've been rolling my own since 1958."
"The one thing that has always bugged me is OAL variances of finished cartridge length. Using your tool head with clamp kit has dropped that variance to a very acceptable number. I loaded up 200 rounds, and took a random 20 count sample for measurement. The variance was .001‰ for the 20 rounds. As far as I'm concerned, it doesn't get any better that that."
"Thanks for offering us reloaders/shooters products that are not gimmicks, but are practical and affordable."
Tim F. – Mineral Wells, TX

"The toolhead arrived yesterday, so I installed it and set it up. This morning I ran off just one box of .45ACP ammo to see how it worked, and the results were excellent. I had almost no powder spilled on the press, better primer seating consistency, and much better OAL consistency. Since there is noticeably less movement in the toolhead, I have convinced myself that the "rhythm" to operate the XL650 has changed and it is a little easier to maintain a steady pace. Please pass along my thanks for a product well made! I am now using the clamped toolhead, the micrometer powder measure, and the powder measure baffle. Good stuff."
Chris O. – Beaverton, OR

Toolhead Prices
550 Standard = $34.95 / 550 Clamped = $42.95
650 Standard = $39.95 / 650 Clamped = $47.95

* You do NOT need to purchase the Toolhead Clamp Kit™ if you are purchasing the "Clamped" version of the CNC machined toolheads.
Toolhead Clamp Kit is a trademark of UniqueTek, Inc. Made in USA Logo

Order Information

Item Number



Toolhead Type
Select the type of toolhead from the drop-down menu below.


  • Tighter Dimensional Tolerances
  • Positions Dies More Accurately
  • Less Flex
  • Lighter but Stronger
  • Clamped and Un-Clamped Types Available



6061-T6 Aluminum


0.0002" (all critical dimensions)

Thread Tolerance

Class 2B


8.0 oz - 550
11.5 oz - 650

See Also

All Prices in US Dollars

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The Original Powder Mirror
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Never Second Guess Your Powder Charge Again!
Custom Powder Funnel
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UniqueTek Product Catalog
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Ranch Bore Reflector
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Pardini Thumb Saver
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Powder Measure Stand Adapter
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