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Coil tarps are the only flatbed cover engineered around the cylindrical geometry of steel coils — pre-shaped bag construction with heavy webbing seams, drop-hatch openings, and reinforced contact zones designed to ride over the eye-vertical, eye-transverse, or eye-lengthwise coil positions that flat tarps cannot seal properly. U.S. steel coil haulers running the Midwest steel corridor (Ohio, Indiana, Pennsylvania, West Virginia) buy this category because a 40,000-pound hot-rolled coil on a coil rack needs a tarp that wraps the cylinder, not a flat sheet pulled across a square load.
If your freight is flat steel sheet rather than coil, see steel tarps — flat-cut construction with extra reinforcement for sharp metal edges. For general flatbed tarp selection and category overview, see the Flatbed Truck Tarps hub or the parent Truck Tarps catalog.
Why Coil Tarps Are Engineered Differently from Flat Tarps
A coil load is a cylindrical mass riding inside a coil rack — three or four steel hooks forming a cradle. A flat tarp draped across it leaves the bottom 30-40% of the cylinder exposed to road spray, salt slush, and weather. Coil tarps fix this with four structural changes that no flat tarp has.
- Pre-shaped bag construction: Three-dimensional sewn-bag geometry wraps the cylinder from the top of the rack down to deck level, sealing the bottom edge that flat tarps cannot reach.
- Heavy nylon webbing every 12 inches: Reinforced webbing transfers tension across the curved surface so the tarp does not lift off the coil at highway wind speeds. Flat tarps rely on perimeter bungees that fail at coil shapes.
- Reinforced contact zones: The points where the tarp rides directly over the coil edge get an extra 22-oz reinforcement layer to handle the abrasion of a 40-60,000-pound coil shifting microscopically over a 1,000-mile haul.
- Drop-hatch loading openings: Top access panels let drivers verify coil position and securement without removing the entire tarp at intermediate inspection points.
A coil tarp is also weather protection only — not a securement device. Steel coil securement is governed by 49 CFR 393.120 with specific rules for eye-vertical (V-coil), eye-transverse (T-coil), and eye-lengthwise (L-coil) positions. Independent chains, hooks, and chocks are required at the working load limit specified for the coil weight. For full FMCSA rules and tie-down pattern math, see FMCSA Cargo Securement Rules; pair with proper G-70 transport chains and ratchet binders rated for the load.
Coil Eye Orientations & Which Tarp Fits Each
Steel coils ride in one of three orientations based on the cargo, the rack design, and the FMCSA tie-down rules. Each orientation needs a different tarp shape.
| Orientation | Eye Position | Coil Tarp Fit |
|---|---|---|
| Eye-Vertical (V-coil) | Coil eye points up | Cube-style bag tarps (7×7×7, 6×7×6) — the most common position for U.S. mill loads |
| Eye-Transverse (T-coil) | Coil eye points across the trailer | Wider rectangular bag with end caps; less common on standard mill runs |
| Eye-Lengthwise (L-coil) | Coil eye points down the length of the trailer | Long tube-style bag; rare and usually custom-built |
FMCSA 49 CFR 393.120 prescribes different securement chain patterns for each orientation. V-coil requires three chains crossing the eye plus chocks; T-coil requires four chains with positive blocking; L-coil requires four chains plus belly chains under the eye. Tarp shape must match orientation — using a V-coil bag on a T-coil load leaves the bottom edge exposed.
Standard Coil Tarp Sizes in Stock
Two stock cuts cover the V-coil position that accounts for roughly 75-80% of U.S. mill coil runs. Custom builds available for T-coil and L-coil work.
- Coil Tarp 6×7×6 in (Black) — fits V-coil loads up to 60-inch outer diameter on standard rack heights; the workhorse SKU for daily Midwest steel runs
- Coil Tarp 60×60×60 in (Red) — high-visibility red for permit and oversize coil loads where escort cars need to see the cargo at a distance; same V-coil fit as the black SKU
- Custom builds — any dimension for T-coil, L-coil, oversize coil packages, or mill-specific rack configurations; 5-10 business day production
Coil Tarp + Coil Rack Compatibility
Coil tarps are designed to ride over a steel coil rack — the 3- or 4-hook cradle bolted to the trailer deck that holds the coil. The tarp wraps the coil + rack as a single unit. A few rack-compatibility notes:
- Standard 4-hook rack: The 6×7×6 and 60×60×60 SKUs fit standard 4-hook U.S. mill racks with eye-vertical loading.
- 3-hook V-coil rack: Same SKU fit; the 3-hook configuration leaves an extra inch of rack visible but does not affect tarp seal.
- Custom mill racks: Some mill-spec racks (Cleveland Cliffs, U.S. Steel proprietary patterns, etc.) require custom-cut tarps to seal the bottom edge correctly. Send rack dimensions when ordering custom.
- Pair with rubber coil protectors: Heavy-duty coil protectors are mandatory under FMCSA rules at every chain contact point with the coil edge — the tarp does not replace the protectors.
U.S. Steel Coil Hauling Lanes & Climate Considerations
- Midwest steel corridor (Ohio, Indiana, Pennsylvania, West Virginia, Michigan): Daily 30-50K-pound coil work — heavy 22 oz coil tarp pays back in 12-18 months because of salt corrosion intensity in winter.
- Gulf Coast steel (Alabama, Louisiana, Texas): Hot-rolled and aluminum coil work — UV-stable vinyl required for I-10 corridor summer asphalt temperatures.
- Northwest aluminum coil (Washington, Oregon): Aluminum mill loads ride lighter than steel but tarp wear is the same — cold-crack rated coil tarp mandatory for Cascade winter crossings.
- Northeast steel (Pennsylvania, New York, New Jersey): Pre-cast steel and structural coil — tight bridge clearances require oversize permit awareness; coil tarp should not add height to load profile.
- Southwest steel construction (Arizona, New Mexico): Construction coil deliveries — UV is the primary failure mode; replace tarps at 18-month interval on this lane.
Build Quality on Every Coil Tarp SKU
- 18 oz vinyl-coated polyester base (22 oz on heavy-duty steel coil cuts) — waterproof, UV-stable, cold-crack rated to -40 °F
- Heavy nylon webbing every 12 inches — transfers tension across curved coil surface
- Reinforced contact zones at coil-edge ride points
- Drop-hatch openings for inspection access without removing the tarp
- Heat-sealed seams on bag construction — no leak at the cylindrical joints
- High-visibility color options — red for oversize coil loads requiring escort visibility
Shipping & Warranty
- In-stock shipping: Same business day if ordered before 1 PM CT
- Continental U.S. delivery: 1-5 business days
- Custom coil tarp builds: 5-10 business day production for T-coil, L-coil, or mill-specific dimensions
- Warranty: 1-year material defect coverage on stock SKUs, 6 months on custom
- Returns: 30 days on unused, uncut standard stock
- Volume pricing: Automatic for fleet orders of 5+ tarps
Frequently Asked Questions About Coil Tarps
- What is a coil tarp and how is it different from a flat tarp?
A coil tarp is a pre-shaped bag-construction cover engineered for cylindrical steel coil cargo riding on a coil rack. It differs from a flat tarp in four ways: 3D bag geometry instead of flat sheet, heavy nylon webbing every 12 inches instead of perimeter bungees, reinforced contact zones at coil-edge ride points, and drop-hatch openings for inspection access. A flat tarp pulled across a coil leaves the bottom 30-40% of the cylinder exposed; the coil tarp wraps the full coil-and-rack unit. - What coil orientations work with these tarps?
Stock coil tarps (6×7×6 black and 60×60×60 red) fit eye-vertical (V-coil) loading, which accounts for roughly 75-80% of U.S. mill coil runs. Eye-transverse (T-coil) and eye-lengthwise (L-coil) orientations require custom-cut tarps because the bag geometry is different — send the rack dimensions and coil OD when ordering custom. - Do coil tarps replace coil protectors?
No. Coil tarps are weather protection only; rubber coil protectors are mandatory under FMCSA rules at every chain contact point with the coil edge to prevent chain abrasion and load shift. The two products work together — coil protectors at the chain contact points, coil tarp wrapping the full coil-and-rack assembly. - What size coil tarp do I need for a 48-inch outer diameter coil?
A standard 6×7×6 in coil tarp fits coils up to 60-inch outer diameter on standard rack heights, which covers most U.S. hot-rolled and cold-rolled mill loads. For coils larger than 60 inches OD or non-standard rack configurations, a custom build is required. - Are coil tarps DOT compliant for steel coil loads?
The tarp itself is weather protection and is not regulated as a securement device. FMCSA cargo securement for steel coils is governed by 49 CFR 393.120, which prescribes chain patterns, working load limits, chock requirements, and orientation-specific tie-downs. The coil tarp covers the load; the chains, binders, chocks, and coil protectors handle the securement. - Can a coil tarp be used on aluminum coils?
Yes. Aluminum coils ride at the same orientations as steel and use the same rack styles. The coil tarp does not care about the underlying metal — the bag construction wraps any cylindrical coil cargo. Aluminum coils are typically lighter than steel (10-25K lbs versus 30-50K lbs for steel), so the same tarp lasts longer because abrasion is reduced. - How heavy are coil tarps?
Stock 6×7×6 coil tarp weighs 35-45 lbs; the 60×60×60 high-visibility red SKU weighs about 40 lbs. Considerably lighter than flat 8 or 10 ft drop tarps because the bag construction concentrates material at the coil shape rather than spreading it across a 48 ft trailer length. - How do I clean a coil tarp after steel oxidation contact?
Hose with cold water within 4-6 hours of unloading to prevent iron-oxide staining of the vinyl. For set-in rust marks, use a mild detergent and soft brush — do not use wire brushes or abrasive pads as they damage the vinyl coating. Store dry to prevent mildew on the inside surface.
Browse Coil Tarps Below
Pick the right coil tarp SKU from the products list below. If you are running custom mill racks, T-coil or L-coil orientation, or oversize coil packages — give us a call before ordering. We have built coil tarp orders for owner-operators running occasional steel runs and full-time Midwest mill fleets carrying 40,000-pound coils six days a week.
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