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Maxi-Duty Dual Wheel Casters

Capacity Range: 5000 - 15,600 lbs.

  • Swivel Construction
5/8" thick drop forged steel mounting plate (rigid plate 1/2" thick); outer legs 3/8" x 5" plate steel continuously welded inside and outside to forged steel horn base (center leg 3/8"x 2")
  • Kingpin
1 1/4" dia. integrally forged with mounting plate guaranteed for life, prevents bending or breaking; threaded for 1 1/4" slotted nut secured by roll pin for positive locking.
  • Main Load Bearing
HPI™ thrust bearing with outside diameter of 7 1/2"; raceways hardened to 58-62HRC and ground to surface finish 16 micro inches.
  • Secondary Load Bearing
1 1/4" precision tapered thrust bearing counteracts radial thrust.
  • Axle
1 1/4" diameter grade 5 hex head with slotted nut and cotter pin.
  • Lubrication Fittings
Ball-check type in swivel assembly and in wheel hubs with tapered or straight roller bearings.
  • Brakes
Keep safety manager happy with a dual heavy duty face contact brake (-DHCB) for more positive locking. Select desired caster from selection table to see brake details.
  • Swivel Lock
4 Position (-4SL)- convert swivel to rigid for straight line steering, robotically welded housing & CNC-milled slots assure long lasting, trouble-free performance.
  • Sealed Swivel Assembly
(-SS) - prolongs caster life in harsh environments.
  • Wheel Bearing Seals
(-DS) - prolong wheel life in harsh environments.
  • Custom Engineering
Hamilton engineers will custom design any caster to meet customer requirements.
 
This dual-wheel series version of the Maxi-Duty Caster addresses the problem of how to restrict overall height while at the same time provide adequate carrying capacity on resilient tread wheels. Dual Wheel Casters also improve stability and swivel more easily than wider-face single wheels because differential action reduces the “scrubbing” effect of soft treads against the floors. The series still touts its “precision” feature indicating that both the secondary thrust bearing and the main load bearing are precision-made, and yet the new HPI™ Swivel Technology is now a standard feature in this dual wheel series providing smoother swiveling and longer life.

For dual wheel casters in use with lighter duty applications, see EHD2 Series.
Hamilton Precision and Durability
The enhanced Maxi-Duty Dual Wheel Series now features Hamilton’s Precision Integrated HPI™ Swivel Technology. This new technology outperforms conventional CNC-machined ball raceways, kingpinless, and unit load bearing swivel constructions. The new design improves the bearing’s element of contact and more than doubles the number of contact points. The new HPI™ raceways are also 45% harder than conventional hardened raceways and the surface finish is an incredibly smooth 16 micro inches.

 

The Maxi-Duty Dual Series (MD) is backed by Hamilton’s Three Year Product Warranty. Refer to selection table for qualifying wheels.
Maxi-Duty-Dual-Wheel-Swivel-Caster
#S-MDD-83DT70 w/ Duralast® XC Wheels

Maxi-Duty-Dual-Wheel-Rigid-Caster
#R-MDD-124SYT w/ Superlast Wheels

Wheel Choices
Maxi-Duty Dual Wheel Series Selection Table
= available for 24 Hour PRONTO® shipment :Three Year Warranty appliesDimensions in inches
Wheel
DiameterFaceType
63

Solid high capacity cast nylon resistant to moisture & many chemicals.

83

A harder (70D) liquid cast polyurethane with load capacity 30% higher than Duralast®.

Hamilton's classic liquid cast 95A polyurethane tread bonded to heavy duty iron center.

Solid high capacity cast nylon resistant to moisture & many chemicals.

New Ultimate Urethane 1" thick on forged steel center.

1" thick harder (70D) poly on forged steel for 30% more capacity than Superlast®.

1" thick 95A polyurethane tread chemically bonded to forged steel center.

New ultimate urethane best in rollability & minimizing heat buildup ideal for continuous operation at high speeds.

103

A harder (70D) liquid cast polyurethane with load capacity 30% higher than Duralast®.

Hamilton's classic liquid cast 95A polyurethane tread bonded to heavy duty iron center.

Solid high capacity cast nylon resistant to moisture & many chemicals.

New ultimate urethane best in rollability & minimizing heat buildup ideal for continuous operation at high speeds.

4

New Ultimate Urethane 1" thick on forged steel center.

1" thick harder (70D) poly on forged steel for 30% more capacity than Superlast®.

1" thick 95A polyurethane tread chemically bonded to forged steel center.

123

A harder (70D) liquid cast polyurethane with load capacity 30% higher than Duralast®.

Hamilton's classic liquid cast 95A polyurethane tread bonded to heavy duty iron center.

New ultimate urethane best in rollability & minimizing heat buildup ideal for continuous operation at high speeds.

4

Hamilton's classic liquid cast 95A polyurethane tread bonded to heavy duty iron center.

Solid high capacity cast nylon resistant to moisture & many chemicals.

New Ultimate Urethane 1" thick on forged steel center.

1" thick harder (70D) poly on forged steel for 30% more capacity than Superlast®.

1" thick 95A polyurethane tread chemically bonded to forged steel center.

Model No.
Roller/Prec. BB
3 YR.
This Maxi-Duty Dual Wheel Caster is backed by Hamilton's Three Year Product Warranty.
MSRPModel No.
Tapered Brgs.
3 YR.
This Maxi-Duty Dual Wheel Caster is backed by Hamilton's Three Year Product Warranty.
MSRPWeight
Lbs.
Load
Capacity
Lbs.
Overall
Height
S-MDD-63NYB$974 601080010
 S-MDD-83DT70$81178650011
S-MDD-83DH$662S-MDD-83DT$763865000
S-MDD-83NYB$1,109 6614400
 S-MDD-83STRT$1,3811017000
 S-MDD-83SYT70$1,092998800
 S-MDD-83SYT$998997000
 S-MDD-83TRT$1,025786000
 S-MDD-13DT70$89087780013
S-MDD-13DH$703S-MDD-13DT$833896000
S-MDD-13NYB$1,188 7415200
 S-MDD-13TRT$1,176877200
 S-MDD-104STRT$1,83614010000
 S-MDD-104SYT70$1,39014013000
 S-MDD-104SYT$1,26913810000
 S-MDD-12DT70$1,040137910015 1/2
S-MDD-12DH$840S-MDD-12DT$9621257000
 S-MDD-12TRT$1,2551278400
 S-MDD-124DT$1,0651359600
S-MDD-124NYB$1,696 15516000
 S-MDD-124STRT$2,07221512000
 S-MDD-124SYT70$1,53721315600
 S-MDD-124SYT$1,39621312000
Model No.
Roller/Prec. BB
3 YR.
This Maxi-Duty Dual Wheel Caster is backed by Hamilton's Three Year Product Warranty.
MSRPModel No.
Tapered Brgs.
3 YR.
This Maxi-Duty Dual Wheel Caster is backed by Hamilton's Three Year Product Warranty.
MSRPWeight
Lbs.
Load
Capacity
Lbs.
Overall
Height
R-MDD-63NYB$741 381080010
 R-MDD-83DT70$57965650011
R-MDD-83DH$439R-MDD-83DT$530645000
R-MDD-83NYB$876 4514400
 R-MDD-83STRT$1,149897000
 R-MDD-83SYT70$860878800
 R-MDD-83SYT$765877000
 R-MDD-83TRT$793656000
 R-MDD-13DT70$66475780013
R-MDD-13DH$482R-MDD-13DT$606736000
R-MDD-13NYB$967 6415200
 R-MDD-13TRT$950757200
 R-MDD-104STRT$1,58912310000
 R-MDD-104SYT70$1,14412313000
 R-MDD-104SYT$1,02312310000
 R-MDD-12DT70$809115910015 1/2
R-MDD-12DH$634R-MDD-12DT$7301157000
 R-MDD-12TRT$1,0241178400
 R-MDD-124DT$8411259600
R-MDD-124NYB$1,472 14516000
 R-MDD-124STRT$1,84916212000
 R-MDD-124SYT70$1,31315915600
 R-MDD-124SYT$1,17215912000