SRJ INC
Patent PortfolioUS · EU · China · Japan

ENGINEERED, PATENTED,
AND BUILT TO OUTLAST.

SRJ doesn't copy off-the-shelf tread designs. Every HiQual™ rubber track ships with one or more of our patented innovations — the Endless T-Bone reinforcement, the S'Wave tread pattern, and the Diamond Rail drive interface. The result is more ground contact, more traction per link, and longer service life under abrasive load.

US Patent
#9,855,985
Endless T-Bone
US Patent
#7,533,945
S'Wave
EU Patent
#3,746,351
Edge Hi-Thru Iron Core
JP Patent
#7,033,666
Edge Hi-Thru Iron Core
Pattern 01 · ENDLESS T-BONE

A REINFORCEMENT, NOT JUST A TREAD.

The Endless T-Bone reshapes the internal steel link from a flat plate into a continuous T-section that runs the full length of the track. The result: more ground contact area, more traction per link, and a smoother ride on the same machine.

US Patent
#9,855,985
A
CONTINUOUS GROUND CONTACT
Smooth Ride
Continuous Ground Contact

Steel links span the full lug width without interruption, so the bottom of the track is always in contact with the surface. Zero break-points means less vibration, smoother travel, and longer cab-life on the machine.

B
CENTER BRIDGED
Better Traction
Center Bridged

The "T" cross-section bridges the lug at its center, forcing load to spread across both shoulders instead of cracking at the rail-line. More usable contact area = more traction per pound of machine.

C
ONE TREAD LUG PER LINK
Independent
One Tread Lug per Link

Each tread lug rides its own steel link rather than sharing one. Individual lugs flex independently across uneven ground — the entire pattern conforms to terrain instead of fighting it.

Pattern 02 · S'WAVE

THE LUG SHAPE IS THE WHOLE GAME.

Our S'Wave tread pattern distributes contact load across two staggered lug bodies per link — labeled A and B in the diagram. The wave geometry pushes more rubber into the contact surface, recovering ground-contact area lost in conventional block-tread designs.

US Patent
#7,533,945
SCHEMATIC · S'WAVE TREAD
S'Wave tread pattern schematic
Each link carries two staggered lug bodies (A & B). The wave path keeps the contact pressure even across the lug pair, even when the machine turns under load.
S'Wave vs Diamond (D) and Block (C) lug comparison
Ground Contact Area per Link
1A + 1B ≥ 1C
1A + 1B > 1D by 3%

The combined contact patch of an S'Wave A+B lug pair equals or exceeds the patch of a single conventional Block (1C) lug, and beats a center-spar Diamond (1D) lug by 3 % per link.

Traction per Link · vs Other Patterns
S'Wave vs Block pattern+21%
S'Wave vs C-pattern+36%

Measured on the SRJ Field Test Track using the same New Holland skid steer, S'Wave delivers 21–36 % more traction per link versus competing pattern families.

C
Block Pattern

One large continuous block per link. Loses contact area in turns; chunks at lug edges.

D
Diamond Rail

Single diamond per link with center spar. Higher rolling stiffness but only one strike point.

S'Wave
S'Wave (SRJ)

Two staggered lugs per link, wave-form connection. Highest contact-area per link in independent benchmarks.

Pattern 03 · DIAMOND RAIL

THE DRIVE INTERFACE, RE-ENGINEERED.

Most rubber tracks live or die at the rail — where the steel link meets the machine's drive sprocket. Our diamond-rail geometry maintains a deliberate 2–3 mm tolerance gap at the contact point, reducing micro-chatter against the sprocket and preventing premature wear on both the track and the drivetrain.

EU
#3,746,351
Japan
#7,033,666
China
#ZL 2019 8 0011008.9
SPROCKET INTERFACE · 2–3 MM TOLERANCE GAP
Sprocket interface · 2–3 mm tolerance gap
2–3 MM GAP
Deliberate tolerance at the rail contact face reduces sprocket-tooth hammer and lets the track shed mud + grit cleanly.
DIAMOND CROSS-SECTION
Symmetric load distribution — the rail bears thrust equally on entry and exit faces.
SMOOTHER DRIVE
Less friction-induced heat at the sprocket, longer life on the drivetrain components downstream.
Why It Matters

PATENT NUMBERS YOU CAN VERIFY.

Every patent listed on this page is real, granted, and searchable on the public registry of the issuing patent office. We list them not because we want to boast — we list them so you can confirm what's engineered into the track riding under your machine.

Combine these three patented technologies with our ISO 9001 quality system and ARDL-validated compound, and you get the spec sheet that has made HiQual the OEM choice for several of the world's largest compact-equipment brands.

USPTO · Granted 2018
#9,855,985
Endless T-Bone Track
USPTO · Granted 2009
#7,533,945
S'Wave Tread Pattern
EPO · Granted 2022
#3,746,351
Edge Hi-Thru Iron Core
JPO · Granted 2022
#7,033,666
Edge Hi-Thru Iron Core
CNIPA · Granted 2021
#ZL 2019 8 0011008.9
Edge Hi-Thru Iron Core
Specify HiQual Patterns

FIND THE PATTERN BUILT FOR YOUR MACHINE.

Browse our full HiQual track size catalog — every track ships with the patented technology shown on this page, sized to fit your specific machine make and model.