Head Expanders And Fixtures

Sentek Dynamics can provide a wide-range of standard head expanders and custom fixtures for applications requiring a larger mounting area, vertical mounting or simultaneous testing of multiple devices under test (DUTs) in sizes up to 1500 mm (60 inches).  FEA is used to ensure an optimal design and superior performance.  Standard material is Magnesium with Aluminum an affordable option. 

Standard Head Expanders 

  • Head plates (square or round) for low-frequency (less than 350 Hz) testing where a large mounting area is needed at an economical cost. (Note: Recommended for DUTs with a low center of gravity)
  • Head expanders (square or round) for working frequencies ranging from 350 to 2000 Hz.
  • Various insert patterns are available

Standard head expanders include stainless steel inserts for enhanced strength and durability.

Head expanders with load support or load support and guidance are designed for testing large, heavy items for demanding transportation test profiles while providing additional load support and restraint. Head Expanders with load support guidance allow DUTs with large footprints to be safely mounted and tested on the shaker, eliminating the risk of damage to the shaker guidance (suspension) system. 

 Custom Fixtures

  • Cube
  • L - type
  • T - type

Custom fixtures can be designed and manufactured to meet unique customer requirements.  Custom cube, L or T type fixtures are many times used by customers without a slip table for 3-axis testing.

A list of standard head expanders follows. For custom head expanders and fixtures please contact the Sentek Dynamics sales office.

Model number example – HES1000X-1200/XXX

Where X = M for Magnesium or A for Aluminum and XXX = Armature diameter in millimeters

Square Plate - Casting
Sentek Model Suitable Armature Diameter (mm) Maximum Working Frequency Hz* Height Approximate Weight
Mg Al
Sine* Random mm in kg lbs kg lbs
HES300X-1000/XXX 110, 150, 200 1000 2000 30 1.2 5 11 12 25
HES315X-1000/XXX 110, 150, 200, 240 1000 2000 30 1.2 6 13 13 20
HES400X-600/XXX 110, 150, 200, 240, 280, 320 600 2000 30 1.2 9 19 19 30
Square Grid - Casting
Sentek Model Suitable Armature Diameter (mm) Maximum Working Frequency Hz* Height Approximate Weight
Mg Al
Sine* Random mm in kg lbs kg lbs
HES500X-500/XXX 110, 150, 200, 240 500 2000 45 1.8 14 30 30 67
HES630X-360/XXX 150, 200, 240 360 2000 45 1.8 16 35 35 77
HES800X-350/XXX 240, 280, 320, 400, 445, 560, 640 350 2000 70 2.8 41 90 91 199
HES900X-350/XXX 240, 280, 320, 400, 445, 560, 640 350 1500 90 3.5 90 198 199 438
HES1000X-350/XXX 240, 280, 320, 400, 445, 560, 640 350 1500 110 4.3 91 200 201 442
HES1200X-300/XXX 320, 400, 445, 560, 640 300 1200 130 5.1 143 315 316 695
HES1500X-200/XXX 445, 560, 640 200 1000 200 7.9 195 429 300 660
Square - Casting
Sentek Model Suitable Armature Diameter (mm) Maximum Working Frequency Hz* Height Approximate Weight
Mg Al
Sine* Random mm in kg lbs kg lbs
HES500X-2000/XXX 150, 240, 280, 320 2000 2000 250 9.9 44 97 97 213
Square - Weldment
Sentek Model Suitable Armature Diameter (mm) Maximum Working Frequency Hz* Height Approximate Weight
Mg Al
Sine* Random mm in kg lbs kg lbs
HES600X-2000/XXX 280, 320, 400, 445 2000 2000 250 9.9 20 44 44 97
HES700X-2000/XXX 280, 320, 400, 445 2000 2000 200 7.9 60 132 133 292
HES750X-2000/XXX 400, 445 2000 2000 250 9.9 88 194 195 428
HES800X-2000/XXX 240, 280, 320, 400 2000 2000 200 7.9 74 163 164 360
HES800X-2000/XXX 445, 560 2000 2000 200 7.9 80 176 177 389
HES900X-1500/XXX 400, 445 1500 2000 200 7.9 91 200 201 442
HES1000X-1200/XXX 400 1200 2000 250 9.9 117 257 259 569
HES1000X-1200/XXX 445 1200 2000 250 9.9 134 295 296 651
HES1000X-1200/XXX 560 1200 2000 250 9.9 137 301 303 666
HES1000X-1200/XXX 640 1200 2000 250 9.9 150 330 332 729
HES1200X-1000/XXX 400 1000 2000 300 11.8 173 381 382 841
HES1200X-1000/XXX 445 1000 2000 300 11.8 193 425 427 938
HES1200X-1000/XXX 560 1000 2000 300 11.8 200 440 442 972
HES1200X-1000/XXX 640 1000 2000 300 11.8 210 462 464 1,021
HES1500X-820/XXX 445, 560, 640 820 2000 375 14.8 345 759 763 1,678
HES1800X-600/XXX 640 600 1000 400 15.8 590 1,298 N/A N/A
Round - Casting
Sentek Model Suitable Armature Diameter (mm) Maximum Working Frequency Hz* Height Approximate Weight
Mg Al
Sine* Random mm in kg lbs kg lbs
HER250X-2000/XXX 110 2000 2000 60 2.4 3 6 6 12
HER250X-2000/XXX 150 2000 2000 60 2.4 4 9 9 19
HER300X-2000/XXX 110, 150, 200, 240 2000 2000 70 2.8 3 6 6 12
HER400X-1200/XXX 110, 200 1200 2000 80 3.2 5 11 11 24
HER400X-2000/XXX 240 2000 2000 200 7.9 23 51 51 112
HER500X-1000/XXX 200 1000 2000 80 3.2 10 22 22 48
HER500X-1000/XXX 320 1000 2000 80 3.2 8 17 17 38
HER500X-1500/XXX 200 1500 2000 150 5.9 15 33 33 73
HER500X-1500/XXX 240 1500 2000 150 5.9 26 57 58 127
HER500X-2000/XXX 320 2000 2000 250 9.9 35 77 77 170
Round - Weldment
Sentek Model Suitable Armature Diameter (mm) Maximum Working Frequency Hz* Height Approximate Weight
Mg Al
Sine* Random mm in kg lbs kg lbs
HER600X-2000/XXX 320 2000 2000 250 9.9 44 97 97 214
HER600X-2000/XXX 400 2000 2000 250 9.9 44 97 97 214
HER630X-1000/XXX 200 1000 2000 150 5.9 20 44 44 97
HER630X-2000/XXX 320 2000 2000 250 9.9 46 101 102 224
HER630X-2000/XXX 400 2000 2000 250 9.9 56 123 124 272
HER750X-2000/XXX 400, 445 2000 2000 250 9.9 56 123 124 272
HER800X-2000/XXX 400, 445 2000 2000 250 9.9 80 176 177 389
HER1000X-1500/XXX 445, 560, 640 1500 2000 250 9.9 130 286 287 632
HER1200X-1200/XXX 445, 560, 640 1200 2000 300 11.8 195 429 431 948
HER1500X-1000/XXX 560, 640 1000 2000 400 15.8 325 715 718 1580
HER1800X-1000/XXX 560, 640 1000 2000 400 15.8 550 1210 842 1852