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Description
boundary oil pump gears Boundary Engineering Billet Oil Pump Gears and Crankshaft Sprocket ComboBoundary Engineering 2015 2026 Mustang 5. 0L 5. 2L GT350 Billet Oil Pump Gears and Crankshaft Sprocket Combo Boundary oil pump gears are 100% manufactured in our Dallas, Texas production facility. We start by quenching our chromoly billets from extreme heat and then temper it to a tough indestructible core. After machining, we apply our ColdFlow surface hardening process and complete it to a Mirror Finish. What does all this give you? It gives you a
Boundary Engineering 2015-2026 Mustang 5.0L / 5.2L GT350 Billet Oil Pump Gears and Crankshaft Sprocket Combo
Boundary oil pump gears are 100% manufactured in our Dallas, Texas production facility. We start by quenching our chromoly billets from extreme heat and then temper it to a tough indestructible core. After machining, we apply our ColdFlow surface hardening process and complete it to a Mirror Finish. What does all this give you? It gives you a pump with stability over 9000 RPM, proven over 2000whp, with higher efficiency, less friction, and backed by one of the industry’s best warranties.
Oil Pump Gear Features
- Mirror Finished and Surface Hardened
- Surface Ground gears for the ultimate in fitment and performance
- Indestructible chromoly core
- Inner and outer gear machined in matched sets
- Our own race-inspired gerotor design for flow and strength
- Each set hand, machine, and hardness inspected with Blueprinting Report
Billet Crank Sprockets from Boundary follows the same heritage as our oil pump gears, manufactured 100% in-house with US-sourced materials. These sprockets start with a chromoly steel that is ten times stronger than the OEM powdered metal, hot quenched with a low temper for the highest strength and resistance to wear.
- All sprockets heat treated to maximum hardness while maintaining toughness
- Precision CNC machined and broached for snug accurate fit
- Dimensions checked after machining and after heat treatment for guaranteed fit.
- 80% more cross-section versus OEM at the keyway
- Weighs 30% more than OEM at 170 grams vs 130 grams giving it the highest-strength sprocket on the market.
- High finish reduces friction and chain vibration
- New tooth geometry strengthens teeth and keyway
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.6 ★★★★★
Based on 1432 reviews
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Product Reviews
★★★★★ 5
Great for the price
Color: Black, Style: With Headrest, Color: Black, Style: With Headrest
Purchased this chair for my son who does a lot of gaming. He loves it. Took about 30 mins to assemble. Instructions are very easy to follow.
Pros
- very easy to put together
- very comfy back rest with arch adjustment
- can recline
- can adjust height
- very stable
- material is very sturdy
- wheels moved smoothly over carpet
- material is strong
- solid black color
Cons
- limited adjustments with recline
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Reviewed in the United States on May 25, 2026
★★★★★ 5
Good quality and good price
Color: White, Style: With Headrest, Color: White, Style: With Headrest
Very easy to assemble, comfortable, sleek design, and the colours are just as pictured. I can't speak on durability as I just got it. The back support works well. Something I loved is that the head and arms support adjust to your needs.
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Reviewed in the United States on May 26, 2026
★★★★★ 5
Would Buy Again!
Color: Black, Style: With Headrest, Color: Black, Style: With Headrest
Purchased this chair several months ago and very pleased with the quality, durability, lumbar support, head rest, rollers and multiple adjustment. I use it some 8 hours a day, it's very comfortable, and highly recommend. Thus far great product for the value.
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Reviewed in the United States on June 2, 2026
★★★★★ 3
Needs improvements
Color: Light Black, Style: With Headrest
I bought 4 chairs for my table.
Easy to put together.
The arms are too short. They move too much and there is no way to lock the arms in place.
The worse thing is the material used to cover the arms. It is sticky. Each chair has the same problem so I took a pair of socks to cover the arms. So, you should offer custom arm covers and a way to lock the arms.
For the weight allowed the pneumatic support that holds and adjusts the height of the seat holds me quite well.
The wheels stick out beyond the seat circumference so everyday I run into them as I go to sit down but it is a good thing as you can be seated and you are not going to flip over if you bend down from the seat to reach for something on the floor.
The seat itself should be able to accommodate a person of a larger size a big man. It is like you made the chair for little people that weigh a lot (narrow seat, short arms, vs. a large wheel span and powerful the pneumatic pump).
The neck support requires a pillow. Without the pillow my head and neck do not rest on the mesh.
Regarding comfort, I sit in the chair for a lot of time each day. Although it feels a bit hard the seat is fairly comfortable. It would be more comfortable if it were bigger.
I purchased these chairs because of the welcoming way the company describes itself, therefore, I hope they will make some changes to improve the chair. I would not buy them if I had the chance again, not without improvements made. I don't need four more chairs, so, I will live with my purchase. If the chairs already had those improvements my opinion would be different. They may be perfect for someone else of a different body type (and age).
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Reviewed in the United States on October 27, 2025
★★★★★ 5
Finally a Chair That Fits and Feels Great
Color: Black, Style: With Headrest
I recently purchased the Marsail Ergonomic Office Chair, and overall, I couldn’t be happier with it.
First off, assembly was incredibly simple. It took me about 30 minutes from start to finish, and the instructions were clear and easy to follow. All the parts were well packaged, and I didn’t run into any issues putting it together.
For reference, I’m 6'2" and about 275 pounds, and this chair fits me very well. As a bigger guy, finding a chair that feels supportive and appropriately sized can be a challenge, but this one hits the mark. The seat is roomy without feeling oversized, and the overall build feels sturdy and solid.
Comfort-wise, it’s been excellent. I work from home and spend about 8–9 hours a day in this chair, five days a week. The thick cushion seat really makes a difference, it stays comfortable throughout the day and doesn’t feel like it’s flattening out after hours of use. I also really like the mesh back. It provides good support while allowing airflow, which helps keep me cool during long work sessions.
The only feature I wish it had is a recline lock at multiple angles. Currently, it only locks in the fully upright position. It would be great to be able to lock it slightly reclined for more flexibility during long workdays.
That said, for the price, ease of assembly, and all-day comfort, this chair delivers tremendous value. I’m giving the Marsail Ergonomic Office Chair 5 stars and would definitely recommend it to anyone looking for a comfortable, supportive office chair, especially if you’re on the taller or bigger side like me.
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Reviewed in the United States on March 2, 2026
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