The IMER – HSM 8 – 8 cu ft Horizontal Shaft Mortar Mixer is a powerful, towable mortar mixer engineered for professional masons and stucco crews who need fast, consistent mixing of mortar, stucco, and grout on demanding jobsites. With an 8 cu ft batch output, aggressive horizontal paddles, and a choice of Honda gas or 120/240V electric power, this mixer delivers high productivity with quiet, efficient operation.

Overview of the IMER HSM 8 – 8 cu ft Horizontal Shaft Mortar Mixer

The IMER HSM 8 is part of IMER’s Horizontal Shaft Mixer line and is designed as an 8 cu ft towable mortar mixer that’s “powerful, towable, mortar mixer” in IMER’s own description. Instead of a rotating barrel, the HSM 8 uses a horizontal shaft with paddles inside a stationary drum to mix mortars, stuccos, and grouts quickly and thoroughly.

This towable 8 cu ft horizontal shaft mortar mixer is available with either an 8 HP Honda GX240 engine or a 1.5 HP 120/240V industrial electric motor, giving contractors flexibility for indoor, outdoor, and remote jobsites. It is sized for crews that need larger batches than a 6 cu ft mixer can provide, without stepping all the way up to a 12 cu ft machine.

Key Specifications: IMER – HSM 8 – 8 cu ft Horizontal Shaft Mortar Mixer

The IMER HSM 8 is built around a heavy‑duty steel drum and a robust drive system optimized for mortar and stucco.

Core technical data

From IMER’s official HSM 8 specification page and product sheet:

• Model: HSM 8 Horizontal Shaft Mortar Mixer.

• Batch output: 8 cu ft.

• Bag capacity: 2.5–3 bags per batch (standard premix 80 lb equivalents).

• Drum: 8 cu ft steel drum (poly tub options available on some variants).

• Gas engine: 8 HP Honda GX240.

• Electric motor: 120/240V 1.5 HP industrial motor.

• Tire size: 5.3 x 12 inch tires, highway‑towable.

• Charging height: 59 3/4 inches.

• Overall height: 57.5 inches.

• Width: 45 inches.

• Length: 73 inches (92 3/4 inches with tow bar).

• Weight: Approximately 610–650 lbs depending on configuration.

IMER lists four core model numbers for the HSM 8: gas/steel, gas/poly, electric/steel, and electric/poly (e.g., 1130081 gas steel, 1130082 electric steel, 1130083 gas poly, 1130084 electric poly).

Horizontal Shaft Mixing System and Drum Design

The IMER – HSM 8 – 8 cu ft Horizontal Shaft Mortar Mixer uses a horizontal shaft driven through a gearbox that transfers power efficiently to the mixing paddles. The paddles are described as “aggressive paddles to mix fast and complete,” ensuring mortars, stuccos, and grouts are thoroughly blended in a short time.

Benefits of the horizontal shaft design include:

• More efficient mixing: The paddles push material across the entire drum, reducing dead zones and improving homogeneity.

• Quieter operation: The gearbox design transmits more power to the paddles while remaining extra quiet compared to some traditional barrel mixers.

• Consistent texture: Especially valuable for stucco coats and masonry mortars where uniform consistency is critical.

The HSM 8 can be supplied with a steel drum as standard and offers durable poly tub upgrade options for users who want easier cleaning and resistance to rust or sticking.

Gas vs. Electric Power Options

One of the strengths of the IMER HSM 8 is the ability to choose between gas and electric power, depending on project needs.

• Gas version (Model #1130081, 1130083):

  • Engine: 8 HP Honda GX240.

  • Ideal for outdoor job sites, new construction, and locations without convenient access to electrical power.

  • Offers strong torque for continuous mixing throughout the day.

• Electric version (Model #1130082, 1130084):

  • Motor: 1.5 HP 120/240V industrial electric motor.

  • Suitable for indoor or emission‑restricted sites and where noise and exhaust need to be minimized.

  • Dual‑voltage capability allows flexibility between 120V and 240V service.

ContractorsDirect notes that users can choose from a Honda GX engine or a Leeson 1.5 HP 120V electric motor in the HSM series, confirming the dual power platform across HSM 6, 8, and 12.

Towable Chassis, Hitch, and Jobsite Mobility

The IMER HSM 8 – 8 cu ft Horizontal Shaft Mortar Mixer is built on a towable frame designed for highway towing and easy maneuverability on site.

Key mobility features include:

• Tow bar with 2 inch ball hitch or optional pintle hitch; the hitch type must be specified at order time.

• 5.3 x 12 inch tires rated for highway towing, so the mixer can be moved between jobs without special transport.

• Compact 45 inch width for navigating tight access areas on crowded sites.

ContractorsDirect specifically calls out that the HSM mixers are delivered with wheels and a tow bar, making them suitable to tow on the highway. This towable design makes the HSM 8 a practical choice for masons and stucco crews who service multiple locations.

Output, Bag Capacity, and Mixing Performance

With an 8 cu ft batch output and a bag capacity of 2.5 to 3 bags, the IMER – HSM 8 – 8 cu ft Horizontal Shaft Mortar Mixer is ideal for mid‑ to large‑sized mortar and stucco jobs.

From the HSM 6–8–12 product sheet and retailer specs:

• Bag capacity: 2.5–3 bags per batch.

• Drum capacity: 8 cu ft.

• Typical materials: mortar, stucco, grout, and similar plaster‑type mixes.

The HSM series’ gearbox design delivers more power to the paddles, meaning the mixer can quietly handle dense mixes and keep a steady output without bogging down. This is particularly important when running continuous mixing operations for brick, block, or stucco crews.

Common Applications for the IMER HSM 8

The IMER HSM 8 is designed for professional trades who need continuous, high‑quality mortar and stucco mixing. Common applications include:

• Masonry: Mixing mortar for block, brick, and stone walls on residential and commercial projects.

• Stucco and plaster: Producing base and finish coats for houses, low‑rise buildings, and facade work.

• Grout and repair mixes: Preparing grouts for CMU cell fill, structural repairs, and patching tasks.

• Thin‑bed and scratch coats: Serving stone veneer and tile over masonry with consistent, workable mixes.

Because the HSM 8 is towable and available in both gas and electric versions, it fits well into a variety of jobsite conditions—from new housing tracts and commercial sites to interior renovations (electric) where exhaust would be a concern.

Features that Improve Jobsite Efficiency

Several design details make the IMER – HSM 8 – 8 cu ft Horizontal Shaft Mortar Mixer especially efficient on the job:

• Gearbox‑driven paddles: More engine power is transmitted directly to the paddles, delivering a better blend and quieter operation.

• Aggressive paddles: Designed to mix fast and complete, reducing mixing time between batches.

• Highway towable frame: Allows crews to move the mixer quickly between multiple jobs in a day.

• Compact width: At 45 inches, the mixer can be positioned close to work areas, reducing wheelbarrow travel distances.

These features help masons and stucco contractors maintain a steady workflow and reduce labor spent handling materials instead of installing them.

Durability, Maintenance, and IMER Support

IMER’s horizontal shaft mixers, including the HSM 8, are described as “designed and engineered to be the best mortar mixers on the market,” emphasizing durability and long‑term performance. The heavy steel drum, rugged frame, and industrial drive components are intended for daily professional use.

Typical maintenance for the IMER HSM 8 includes:

• Cleaning the drum and paddles after each use to prevent buildup and maintain mixing efficiency.

• Checking engine oil, air filter, and spark plug on Honda GX240 gas models.

• Inspecting belts, gearbox, and paddle hardware periodically per the manual.

• Verifying tire pressure and hitch integrity before highway towing.

IMER provides official documentation, including the HSM 6, 8, & 12 product sheet and dedicated HSM 8 web page, and many dealers offer parts such as replacement drums, paddles, electric motors, and Honda engine components.

Why Choose the IMER – HSM 8 – 8 cu ft Horizontal Shaft Mortar Mixer?

The IMER – HSM 8 – 8 cu ft Horizontal Shaft Mortar Mixer is an excellent choice for contractors who need a mid‑sized, towable mortar mixer with high output, quiet operation, and flexible power options. Its 8 cu ft batch capacity, 2.5–3 bag load rating, aggressive horizontal paddles, and Honda GX240 or 1.5 HP 120/240V motor options provide strong, versatile performance for mortar, stucco, and grout work.

With a highway‑towable frame, compact width, and durable steel (or optional poly) drum, the HSM 8 offers a reliable, professional solution for masonry, stucco, and specialty plaster crews who demand consistent mixes and dependable equipment on every job.