Product Description

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

telescopic hydraulic cylinder

hydraulic cylinders

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:

telescopic hydraulic cylinders

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?

Yes. The 108" stroke, 44.75" closed height, and SAE #8 porting match the standard commercial envelope widely used across North American dump trailers. Always cross-check the trunnion pin size (1.063") and top eye (2.00") against your existing brackets.

Is this cylinder single-acting (gravity down) or double-acting?

The HTC series inverse cylinders are single-acting (power up / gravity down), utilizing the heavy weight of the steel dump body to retract smoothly and rapidly.

How does HCIC ensure stage concentricity and seal life?

Every stage is manufactured from cold-drawn ST52-3 / E355 high-yield alloy steel tubing, precision-honed, and hard chrome-plated, fitted with multi-lip polyurethane seals and heavy-duty brass wipers to eliminate internal bypass.