Powerhold Inc

POWERHOLD is a manufacturer of welded tombstones, rotary table risers, jaw chucks, diaphragm chucks, collet chucks, live and dead centers, and fixtures,

POWERHOLD is a USA based Manufacturer of specialty chucks, fixtures and tailstock centers for high production machining customers

POWERHOLD offers the following products for manufacturing

Customized solutions provider of Jaw Chucks, Collet Chucks, Diaphragm Chucks, Swing Clamp Chucks for turn and grind

Specialized fixture components for HMC and VMC needs – Welded Tombstones, Indexer Risers, Trunion Tailstocks

Provider of high precision standard and custom made live and dead centers

Photos from Powerhold Inc's post 01/08/2018

New Press Release from Powerhold


Cylindrical grinding between centers can be cumbersome when the part has no feature that can be used for driving. That gets even more challenging if the goal is to automate the grind cell with an automatic loader. Powerhold has successfully developed a process for numerous customers using a compensating jaw chuck to drive the part between centers for grinding. Compensating jaw chucks are often used for turning work on shafts and rifle barrels, but are not normally known to use for cylindrical grinding. A typical compensating Jaw chuck has a springloaded center-point that locates the part against a chuck-mounted part rest, and either 2 or 3 jaws that are connected on a swivel internal to the chuck so that they can clamp on a surface that is not concentric to the locating center. On a typical 7 inch chuck the part grip surface can be out of round as much as 4 millimeters to the locating center. The jaws each contact the part individually, and the swivel self-aligns so that the drawbar pull force is equal on all the jaws even though they are not centering the part.

In order to get the proper results for grinding, Powerhold retrofits the chuck with a fixed center housing, with a high accuracy carbide dead center. We then provide special top jaws that minimize lift of the part off the center-point. A custom made part rest is also supplied on the chuck face. Center-points can be standard 60 degree tip, or special sizes, female style, bullnose style, or whatever is required. Tailstock force is required to hold the part on the chuck center-point, and must be kept low, especially on small parts that could deflect under higher tailstock forces..

Center quality on the workpiece is critical to getting good results. The repeatability of the grind process will only be as good as the centers on each end of the workpiece.

Powerhold has achieved parts cylindrically ground to better than 50 millionths with this setup. Because there is no drive dog or drive pin, a robot can load the parts into the chuck with no concern for orientation. Jaw stroke is typically 8 mm or more per-jaw on these chucks so there is no concern for tight fit or load clearance with the robotics, as opposed to compensating collet chucks which have much smaller load clearance. An air actuator is often part of the complete grinder spindle package, allowing the operator to tune the clamp force to the application requirement.

Powerhold provides the chuck, center-point and center housing, part rest, spindle adapter, drawtube connection, and air cylinder as part of our package for grind applications. The most common chuck size is our 7 inch version, but the chucks come in 8 and 12 inch sizes for larger parts if required.

Powerhold is a custom workholding supplier that strives to maximize our customer’s machine tool investments, by providing engineered cost effective workholding solutions. For more information contact Powerhold or visit www.powerholdinc.com.


POWERHOLD is exhibiting at 2017 CMTS, September 25-28, 2017 at the Inetrnational Center in Toronto. Our BOOTH is # 3906. Visit us there.

To receive a free exhibitor pass, click on this link and register today:


Timeline Photos 06/16/2017





, , , , , , , , ,

Timeline Photos 01/30/2017

Timeline Photos

Timeline Photos 12/23/2016

The Powerhold Christmas Party Ugly Sweater Contest participants

Timeline Photos 12/23/2016

Merry Christmas from the team at Powerhold

Highlights from the 2016 Technology Open House and Steakout 12/12/2016

Highlights from the 2016 Technology Open House and Steakout

Highlights from the 2016 Technology Open House and Steakout Watch highlights from the 2016 Technology Open House and Steakout at OptiPro. Over 400 people attended during the two-day event to see the latest technology ...

Wake Up with CONNSTEP's Manufacturing Forum 12/12/2016

Wake Up with CONNSTEP's Manufacturing Forum

Forum attendee Chad Spooner of Powerhold Inc

Wake Up with CONNSTEP's Manufacturing Forum 12/12/2016

Wake Up with CONNSTEP's Manufacturing Forum

CONNSTEP's Jack Crane welcomes guest and manufacturer William Spooner of Powerhold Inc

Timeline Photos 12/12/2016

BRUCKNER Gmbh now offers a new Slim-Line series of live centers to their family of live and dead center offerings. Morse Taper 2, 3, and 4, in standard of insert style tips. Powerhold is the value added importer for Bruckner in USA and Canada for past 15 years. The new Slim-Line extends the line to fit in applications with tool clearance limitations around the spindle. , ,

Timeline Photos 11/17/2016

Just ran across this photo from one of our customers that uses a Powerhold pneumatic collet fixture on a Robodrill, for making these automotive hubs for Borg Warner. The collet grips on the ID spline pitch diameter. A simple gripper moves the part from the load, to the fixture and then to the finished position. Powerhold has produced about a dozen of these fixtures for this customer over the past decade. Simple design, no hydraulics required, perfect for any drill-and-tap application. ,

Timeline Photos 11/15/2016

POWERHOLD PHR Rotary Table Risers

The newest product line offering from Powerhold, PHR Riser Plates can be supplied for every major brand and model of rotary table.

PHR risers are solid steel, with mounting holes and keyway slots for both the machine table and indexer. Ground top and bottom to the precise height you require.

Simply provide us with the rotary table brand and model, as well as the brand and model of your vertical machining center, and the height you want the riser, or the total height required to the indexer centerline. Quotes are provided fast.

Powerhold has supplied these bases to many OEMs and now they are available to help you quickly retool your machine for your next 4th or 5th axis project.

We have in-house designers to handle any requests you have to customize the riser to your special needs

Photos from Powerhold Inc's post 10/04/2016

Standard and Custom Welded Tombstone Columns

Sometimes a cast tombstone column doesn’t give you exactly what you need. Powerhold can quickly and easily quote, design and build the steel welded tombstone you want for your 400, 500 or 630 mm HMC.

Choose from 12 standard designs, specify the height and face-width, or just e-mail us your sketch of what you want. It couldn’t be easier

Timeline Photos 09/20/2016

Flavio Giacomini, CEO of our partner Tecnomors, joins Scott Strang and Will Spooner of Powerhold during IMTS in Chicago. Tecnomors chucks were on display, including the newest release MAE-Tech series compact 4 inch self-centering pneumatic vise. Graziano Giacomini and Giovanni Patrini of Tecnomors were also on hand for the IMTS visit.

Timeline Photos 09/20/2016

Doug Woods, Preisdent of AMT welcomes guests to the International Marketing Breakfast during IMTS. Powerhold joined many other AMT members, many of which were workholding manufacturers, at this conference. Speakers from the AMT offices in Brazil, India, China, Mexico and Europe all presented their outlook for manufacturing in each of those regions.

Photos from Powerhold Inc's post 09/19/2016

A great week out at IMTS in Chicago. It included a great evening with United Grinding with a reception and motown singing group performing over at Morgan Manufacturing, and Happy Hour in the Doosan booth after the show with a blues band. We appreciate the opportunity to work with these fantastic OEMs.

Timeline Photos 09/19/2016

POWERHOLD just returned back from our IMTS 2016 show in Chicago. We want to thank our existing customers who took the time to come and visit with us, and appreciate the many new contacts made at the show. Next show up will be EASTEC in May 2017, W Springfield, Mass as the Eastern States Exposition..

Taking Stock of Turning : Automotive Design & Production 07/14/2016

Taking Stock of Turning : Automotive Design & Production


This article includes a case study involving Powerhold-Gamet DELTA Series chucks. The customer tested our 170DE model chucks against two other brands for 1 year before deciding to purchase DELTA chucks for all 10 of the Nakamura Tome lathes. Now 10 years later, the chucks are still running.

Taking Stock of Turning : Automotive Design & Production An Okuma LB3000 turning center. The use of high-pressure coolant on equipment like this can greatly increase productivity in turning operations.

CNC Machining Dynamac, Addison, IL 07/12/2016

CNC Machining Dynamac, Addison, IL

Powerhold supplied the trunion shown on this video. The unit was supplied to Methods Machine tools as a special version of our PH301 trunion plate assembly used on a Fanuc DDR indexer.


uploads.powerholdinc.com 07/12/2016


An article discussing the importance of reviewing your workholding requirements with an industry expert. Written by William Spooner, Vice President of Powerhold and published in the May 2016 AMT News. https://lnkd.in/dveUSVb


Timeline Photos 07/11/2016

On Display for IMTS in September - McCormick Place Chicago, Sept 12-17

TECHNOMORS - MAETech chucks - A new better-value option to standard brand of mill chucks from a company you know delivers high-quality products.

PHT - Powerhold Welded Tombstone Columns. When the cast catalog tombstone isn't what you need. We offer dozens of standard designs and can easily make one custom to your needs. WHY SHOULD CUSTOM COST YOU MORE

PHR - Rotary table risers to easily give you what you want when retooling a job with an existing rotary table. We offer standard units for many major brands like Koma, Haas, Nikken, Kitagawa and many more, made to the exact height you need.

Timeline Photos 07/08/2016

Last month Powerhold held our annual company meeting. On hand as special guests to help present to our staff were Jack Crane and Maribel Morgan from lean process consulting firm CONNSTEP, and Chris DiPentima from Pegasus Manufacturing, who has been working with Connstep for several years. Additional guests included Fred Railey, Kimberly Ryder, and Rich Knotek. Thank you to all of our guests for your participation.

Timeline Photos 07/08/2016

Two weeks ago Chad and Scott presented 'Simplifying Workholding Challenges' to about 50 customers at OptiPro in Ontario, NY. OptiPro is the distributor for Robodrill, Nakamura Tome, and other Methods Machine Brands. Thanks to Don and the OptiPro crew for the chance to participate.

Want your business to be the top-listed Equipment Service in Middlefield?
Click here to claim your Sponsored Listing.


Power Jaw Chucks
Collet Chucks
Diaphragm Chucks
Welded Tombstone Columns
Rotary Table Risers
Milling Chucks
Live Tailstock Centers
Dead Tailstock Centers



Middlefield, CT

Opening Hours

Monday 8am - 4:30pm
Tuesday 8am - 4:30pm
Wednesday 8am - 4:30pm
Thursday 8am - 4:30pm
Friday 8am - 4:30pm