12-Ton Inverse Telescopic Hydraulic Cylinder
Product Description
Product Detail
When you build or repair commercial dump trailers for the North American market, trunnion-mounted inverse telescopic cylinders are the gold standard for front-wall and doghouse hoist installations. The HTC12T-108 12-Ton Inverse Telescopic Hydraulic Cylinder is precision-engineered to deliver heavy lifting power while keeping retracted pin height extremely compact.
By mounting the outer barrel to the upper dump body and anchoring the stationary rod base to the lower trailer chassis (the "inverse" arrangement), the polished chrome stages remain covered and protected inside the main barrel during transit—drastically cutting down on stone chips, road grit blasting, and seal wear.
I. HTC12T-108 Official Specifications
| Parameter / Dimension Key | Catalog Value | Engineering Notes |
|---|---|---|
| Model Number | HTC12T-108 | Stamped on lower trunnion / barrel |
| Rated Lifting Capacity | 12 Tons | Standard rating for tandem & tri-axle dump bodies |
| Total Extended Stroke | 108.0 in (2,743.2 mm) | Generates steep 45°–50° clean-dump angles on 14'–18' bodies |
| A (Closed Mounting Length) | 44.75 in (1,136.65 mm) | Retracted pin-to-pin / mounting center distance |
| B (Base Diameter) | 4.40 in (111.76 mm) | Main lower body envelope dimension |
| C (Top Pin Diameter) | 2.00 in (50.8 mm) | Upper body cross-pin / eye mounting size |
| D (Trunnion Pin Diameter) | 1.063 in (27.0 mm) | Lower trunnion mount pivot pin diameter |
| E (Trunnion Span Width) | 3.00 in (76.2 mm) | Trunnion mount bracket spacing |
| F (Upper Mount Thickness) | 1.50 in (38.1 mm) | Top eye mounting boss width |
| G (Lower Bracket Span) | 7.50 in (190.5 mm) | Lower frame mount bracket clear width |
| H (Mounting Offset) | 1.50 in (38.1 mm) | Mounting baseline offset reference |
| L (Base Width) | 7.00 in (177.8 mm) | Lower support footprint width |
| Hydraulic Port Size | SAE #8 (3/4-16 UNF) | Industry standard O-ring boss port for leak-free sealing |
| Dry Weight | 132 lbs (≈ 59.87 kg) | Lightweight high-tensile steel construction |
| Oil Displacement Volume | 3.4 Gallons (≈ 12.87 L) | Total fluid required for full extension |
| Catalog Reference | HCIC-2026 Catalog, Page 14 | Direct OEM manufacturing specification |
II. Why OEM Dump Trailer Builders Choose the 12-Ton Inverse Design
The HTC12T-108 12-Ton Inverse Telescopic Hydraulic Cylinder solves three of the biggest headaches trailer manufacturers face:
- Maximum Dump Angle in Tight Doghouses: Packing a 108" stroke into a 44.75" closed package allows trailer builders to achieve full clean-out dump angles even on tall 14-foot to 18-foot dump bodies with limited front doghouse height.
- Superior Seal & Rod Protection: In the inverse configuration, the largest barrel is at the top. As the cylinder extends, the sliding stages extend downward or stay protected within the inverted shroud, shielding delicate seal lips from asphalt tar, gravel splatter, and wash-bay pressure wands.
- Standardized SAE #8 O-Ring Boss Porting: Avoids messy pipe thread leaks common with old NPT fittings. The SAE #8 port handles high-pressure pump flow without excessive line turbulence or thermal build-up.
III. Essential Fitment Checks for Your Trailer Build
Before ordering replacement hoists or standardizing on the HTC12T-108 for your production line, verify:
- Hydraulic Tank Usable Volume: The cylinder requires 3.4 gallons of oil to extend fully. Your hydraulic reservoir must provide at least 4.5 to 5.0 gallons of usable reserve above the pump intake to prevent aeration at maximum dump angle.
- Trunnion Pin & Top Eye Alignment: Ensure your chassis trunnion brackets match the 1.063" lower pin diameter and your body header matches the 2.00" top eye pin.
- Clearance Arc Through Dumping Cycle:** As the body tips up, the cylinder pivots through an arc. Verify that the 4.4" outer barrel clears trailer front crossmembers and front bulkhead stiffeners.
- Relief Valve Setting: Pair with standard 12V DC or PTO hydraulic systems set to 2,500–3,000 psi to achieve the rated 12-ton lifting curve.
IV. What to Include When Requesting an OEM Quotation
When contacting HCIC for an official quote on the HTC12T-108 12-Ton Inverse Telescopic Hydraulic Cylinder, please share:
- Planned dump trailer box length and rated gross vehicle weight (GVW)
- Doghouse height and mounting bracket style (standard trunnion vs custom cradles)
- Annual production quantity or immediate replacement batch size
- Preferred shipping terms (FOB Qingdao, CIF North American ports, or DDP to your facility)
V. FAQ
Can the HTC12T-108 replace other North American telescopic cylinders like Mailhot or Custom Hoists?
Is this cylinder single-acting (gravity down) or double-acting?
How does HCIC ensure stage concentricity and seal life?
VI. Request Direct Factory Pricing from HCIC
HCIC has over 28 years of specialized experience engineering telescopic hydraulic cylinders for global trailer and truck manufacturers.