High-Reduction Horizontal Shaft Impactor

Crushing Sentry® Horizontal Shaft Impactor (HSI)

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Strike Hard, No Drama

When high reduction ratios are your goal, the Sentry HSI brings dependable force with less complication. Its straightforward design simplifies operation and maintenance, while rugged components take on tough feed without wearing down the team maintaining it.

Whether it’s bolt-on blow bars that swap fast, or an adjustable curtain that dials in your gradation, this impactor delivers flexibility without complexity. And when it’s time for parts or support, you’ll get what you need quickly; through a responsive team that’s obsessed with follow-through.

How An HSI Works

Upon entry, feed material quickly contacts a series of blow bars spinning rapidly on a rotor.

These blow bars (hammers) violently toss the rocks against steel curtains (aprons) causing the material to break. Eventually, newly shaped rock exits the opening at the bottom of the HSI.

HSI-Operation

Worker in safety vest standing on platform beside Superior® Sentry® HSI at active mobile crushing site

Models

3D rendering of the Sentry HSI SP Series with a compact single-rotor design and integrated feed hood.

SP: Primary

Takes on the first bite of the feed with a heavy rotor and wide opening built to crush massive rock in high-volume primary applications.

3D rendering of the Sentry HSI SS Series featuring a heavy-duty single-rotor and larger feed opening.

SS: Secondary

Delivers precise, high-ratio reduction with adjustable curtains and optional grinding path for a consistently cubical product.

SR: Recycle

Handles reclaimed asphalt and concrete with a rugged design and closed-circuit flexibility for efficient on-site recycling.

Advantages

Hydraulic Quick-Open Housing

Dramatically reduces maintenance time and improves safety by giving full internal access at the push of a button.

Adjust-on-the-Fly Curtains

Lets operators fine tune gradation hydraulically without stopping production, valuable for consistent spec and productivity.

Multiple Blow Bar Options

Get precise crushing for your feed with multiple blow bar metallurgies that align to your preferred performance, wear life, and budget.

High-Inertia Cast Rotor

More mass, more punch. Carries momentum through tough feed to boost reduction, consistency, and uptime.

Recycling, Site to Site

Knopik Crushing is using a 51x65 Sentry HSI to chew through 40,000 tons of recycled concrete and asphalt, everything from old curb slabs to ready-mix returns.

This crew travels to more than a dozen temporary sites during their crushing season, so a one-piece HSI plant was critical to their efficiency.

With reliable support from General Equipment & Supplies, Knopik says it’s a powerful partnership with Superior that stands behind the equipment and keeps their operation running strong.

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Sentry HSI Models & Specifications

General Specifications

Compare Sentry® HSI models by rotor size, maximum feed size, feed opening, estimated crushing capacity, power requirements, and weight.

Model	Rotor Size (D x W)		Max Feed Size		Feed Opening		Capacity		Power		Weight
Model	mm x mm	in x in	mm	in	mm x mm	in x in	mtph	stph	kW	hp	kg	lbs
SP5155	1,300 x 1,400	51" x 55"	600	24	1,257 x 1,435	49.5" x 56.5"	250 - 350	275 - 385	250	350	18,500	40,785
SP5565	1,400 x 1,650	55" x 65"	800	32	1,150 x 1,680	45" x 66"	355 - 500	390 - 550	350	500	26,000	57,332
SP6384	1,600 x 2,130	63" x 84"	1,000	39	1,600 x 2,150	63" x 85"	700 - 900	770 - 990	500	700	42,000	92,813
SS3936	1,000 x 900	39" x 36"	400	16	650 x 950	26" x 37"	80 - 150	90 - 165	110	150	9,500	20,948
SS4355	1,100 x 1,400	43" x 55"	450	18	850 x 1,450	33" x 57"	150 - 250	165 - 275	185	250	12,500	27,563
SS5165	1,300 x 1,650	51" x 65"	500	20	750 x 1,700	30" x 67"	250 - 400	275 - 440	350	500	23,800	52,481
SS5583	1,400 x 2,100	55" x 83"	600	24	850 x 2,150	33" x 85"	300 - 500	330 - 550	600	800	33,000	72,767
SS4355G	1,100 x 1,400	43" x 55"	450	18	850 x 1,450	33" x 57"	150 - 250	165 - 275	185	250	13,500	29,768
SS5165G	1,300 x 1,650	51" x 65"	500	20	750 x 1,700	30" x 67"	250 - 440	275 - 484	350	500	25,000	55,000
SS5583G	1,400 x 2,100	55" x 83"	600	24	850 x 2,150	33" x 85"	300 - 500	330 - 550	600	800	35,000	77,178
SR3936	1,000 x 900	39" x 36"	500	20	650 x 950	26" x 37"	80 - 150	90 - 165	110	150	10,500	23,153
SR4250	1,070 x 1,270	42" x 50"	500	20	834 x 1,300	33" x 51"	120 - 200	130 - 220	225	300	12,615	27,811
SR5165	1,300 x 1,650	51" x 65"	800	32	1,200 x 1,650	48" x 65"	250 - 400	275 - 440	315	400	25,800	56,891

Crusher Dimensions

Compare Sentry® Horizontal Shaft Impactor (HSI) dimensions across 13 models, including overall measurements A, B, C, and D. Refer to the dimension diagram in the product literature for measurement locations.

Model	A		B		C		D
Model	in	mm	in	mm	in	mm	in	mm
SP5155	111"	2,830	113"	2,870	133"	3,378	101"	2,565
SP5565	116"	2,950	117"	2,980	142"	3,600	105"	2,660
SP6384	142"	3,600	145"	3,675	157"	4,000	157"	3,990
SS3936	83"	2,100	88"	2,240	106"	2,680	85"	2,150
SS4355	85"	2,150	90"	2,290	108"	2,740	94"	2,385
SS5165	96"	2,450	115"	2,920	132"	3,365	112"	2,850
SS5583	104"	2,640	119"	3,020	138"	3,510	148"	3,760
SS4355G	87"	2,210	92"	2,337	107"	2,718	95"	2,413
SS5165G	96"	2,450	115"	2,920	132"	3,365	112"	2,850
SS5583G	104"	2,640	119"	3,020	138"	3,510	148"	3,760
SR3936	85"	2,150	90"	2,280	106"	2,680	85"	2,150
SR4250	83"	2100	88"	2,230	107"	2,728	88"	2,234
SR5165	103"	2,620	115"	2,920	135"	3,420	112"	2,850

Sentry HSI crushing capacities are estimated using material with a work index of 12–14 and bulk density of 100 lb/ft³ (1.6 mt/m³). Feed gradation should contain less than 10% passing the crusher setting. Actual capacity depends on feed characteristics, available horsepower, and operating conditions. Consult Superior for application-specific recommendations.