Bevel Gear Jacks BG250 (15 Ton)

BG250S, BG250D

Joyce BG250S and BG250D bevel gear jacks with a 15-ton static capacity, offer higher efficiency and greater speed than other mechanical screw jacks. As an added benefit, these mechanical actuators also act as miter boxes, making them an ideal choice for multi-jack systems. As many as three output shafts may be specified for mounting motors, limit switches, readout devices and other accessories. BG250 jacks with single lead screws (S series) provide the benefits of a self-locking screw, and bevel gear jacks with double lead screws (D series) offer even greater travel speed.

  • 2 ½" diameter lifting screw
  • Choose one of four standard end conditions
  • Protective boots and other options are available
  • Right hand and left hand screw threads are available
  • Joyce/Dayton can customize to your specifications
  • Ductile Iron housing
  • Lifting screw, CDS
  • Aluminum Bronze traveling nut (KFTN)
  • Input shaft, CDS

Sample Part Number:

Click on the part number to reveal additional informaton about actuator designs and shaft codes.

Joyce Bevel Gear® Jacks
BG150S BG1500S
BG250S BG150S
BG375S BG150S
BG450S BG150S

Jack Configuration

Jack Configuration
Upright Bevel Ball Actuator configuration Inverted Bevel Ball actuator conversion
U= Upright I= Inverted

End Conditions

Jack Design

Actuator Design
Bevel Ball Translating Actuator Example Keyed for Non Rotation is not a standard Option Bevel Ball Actuator- Traveling nut example
S= Translating Keyed for Non Rotation N= Travelling Nut

Bevel Ball Actuator Rise

Bevel Ball Actuator Rise
Rise is travel expressed in inches and not the actual screw length
Shaft Codes
Three shaft codes must be specified for each jack. Electronic and mechanical limit switches may be substituted for the shaft code per the tables on this page.
STDX- Standard
XXXX- Input shaft no required
When ordering with only one input shaft, it is recommended to order the following configuration: XXXX-STDX-XXXX
Additional Options
X= Standard Jack, no additional options
X= Additional Specification Required (comment as necessary)
Protective Boots
B= Protective Boot
D= Dual Protective Boot
F1= Do Not Paint
F2= Epoxy Paint
F3= Outdoor Paint processes
ACME Screw
L= Left hand Screw
Screw Stops
ModelDynamic CapacityUpright Assembly: Screw-in compression/ 
inverted assembly: screw-in tension
Upright Assembly: screw-in tension/ inverted assembly: Screw-in compressionScrew Dia.Screw Pitch/LeadBevel Gear RatioPinion Turns for 1" TravelPinion Torque (In. Lbs.)Screw TorqueJack EfficiencyJack† Cooling TimeBase Weight (Lbs.)Add for Each Inch of Travel (Lbs.)
BG250-S Please
or contact Joyce /
30,000 lbs. 30,000 lbs. 2 ½" .500 P ACME 2C 2.15:1 4.31 .111W* .227W* 34.2% 82 min. 140 2.6
BG250-D* 30,000 lbs. 30,000 lbs. 2 ½" .375P / .750L ACME 2C 2.15:1 2.87 .133W* .272W* 42.6% 82 min. 140 2.6


Important Note: *Not self-locking, may lower under load. Brake motors or external locking systems are recommended.
D: Double Lead Screws.
S: Single Lead Screws. These jacks are self-locking.
*W: Load in Pounds.
Pinion Torque: The torque required to continuously raise a given load.
Screw Torque: The torque required to resist screw rotation (translating jack design) and traveling nut rotation (keyed for traveling nut design).
Lead: The distance traveled axially in one rotation of the lifting screw.
Pitch: The distance from a point on the screw thread to a corresponding point on the next thread, measured axially.
†: Cooling time based on time to cool from 200°F to 70°F (ambient).

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