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Deck Fittings and Chocks

Patterson Decking Equipment


Grounded in innovation.

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The Patterson patented Self-Aligning Roller Chocks (S.A.R.C.) are the next evolution in boat to barge coupling. Effectively utilized for both face wires and wing wires, the Patterson line of S.A.R.C’s include all of the features you’ve come to expect: optimized sheave materials for both synthetic rope and steel cable, rounded edges to minimize wear points, corrosion resistant construction utilizing stainless steel and protective coatings for extended life, and the extreme durability that you’ve come to associate with the Patterson name. In addition, true to Patterson form, we have incorporated a variety of innovative features that are sure to help you do your job Safer, Easier, and Faster.


Self-Aligning Roller Chock

Performance Data

Rated Load* 65 Tons 40 Tons 20 Tons
Working Line Load* 65,000 lbs. 40,000 lbs. 20,000 lbs.
Rope Diameter 1 1/8” 1” 0.75”


Horizontal Alignment Mounting System – In the past, similar types of chocks could only align vertically. This helped extend the life of the rope, but allowed for dangerous side loading that could lead to permanent yielding of the product causing it to become non-functional, or worse, catastrophic failure. With the Patterson Horizontal Alignment Mounting System, the S.A.R.C. becomes the first truly self aligning design, as the entire unit always orients itself to the center of the line pull, both vertically and horizontally, regardless of the angle.



Spring Loaded Vertical Assist – The protection of your rope is critical, both to ensure safe operating conditions, and to minimize the replacement cost of this expensive consumable. We get this, which is why we created the Spring Loaded Vertical Assist. Using a super high strength torsion spring mechanism, we effectively eliminate the majority of the weight of the sheave housing, allowing your chock to begin aligning with little to no line tension, even when using ultra light synthetic rope. This eliminates abrasion by keeping the rope where it belongs: in the sheave, keeping you safer, and saving you money.

Stainless Steel Roller Button

Rated Load* 50 Tons
Working Line Load* 50,000 lbs.

Patterson Roller Buttons are different from any other product out there. Their unique design features a substantial base that simply won’t yield under pressure, and they’re made of stainless steel. Tested extensively at high-cycle rates that mimic real life, they’ve been proven to 50 tons. Broken roller buttons lead to downtime, hotwork, decreased productivity — and lower profits. There’s no reason to risk using anything else but ours.


*R.L. (Rated Load) – The total amount of continuous pull (load) allowed on the unit at any time. The maximum R.L. occurs when the maximum W.L.L. is achieved and the rope is wrapped 180° around the sheave. This is equal to two times the W.L.L.*W.L.L. (Working Line Load) – The amount of continuous allowable line tension on the unit.

Download the Operations Manual for Self-Aligning Roller Chock (SARC) and Synthetic Roller Button (SRB)

This video shows why the Self-Aligning Roller Chock is safer and more economical than its common alternatives:

Media coverage for the S.A.R.C.:

Patterson Manufacturing’s Self-Aligning Roller Chock (S.A.R.C.) was featured in a January 2015 Marine News article titled ‘Securing’ the Inland Markets with Innovative Standardization, which you can read here: SARC