SJ Mod.A Series Screw Jack

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Compact design screw jacks

Acme screw jacks recommended for intermittent duty cycle
Long-life synthetic grease-lubricated worm gear
High precision worm gearbox, ZI involute profile
Gearbox ratio from 1:4 to 1:36
Monobloc gearbox housing, robust and compact shape
Input speed up to 1.500 rpm
Acme screw drive, travelling screw (Model A)
Acme screw 1- or 2-starts

1 – Acme screw made of stainless steel, C 43 (UNI 7847) Whirled thread
2 bronze travelling nut that has Fl ange
3 – worm shaft that has true involute grounded worm Profi Le ZI (UNI 4760)
4 Made of steel, case-hardened bronze worm wheel that is genuine involute profi le ZI (UNI 4760)
5 Cast iron support for the rim of the worm wheel made of bronze
6 – acme screw fixed to the worm wheel via LEFT-HAND (for the push load) or right-hand (for pulling load) thread metric
7 lock nut that is in the opposite direction of the metric thread to make sure that the screw is safe for xing
8 – Acme screw – worm wheel screws against screwing
9 Slotted spring pin
10 – thrust ball bearing to ensure large load capacity
11 monoblock gearbox
12 – threaded cover that has a guide for the acme screw. It can be utilized as a spigot diameter
13 – grub screws that stop the cover from unscrewing
14 – a guide to acme screw; could be employed as a spigot diameter
15 – long-lasting synthetic grease-lubricated worm gearbox
16 grease nipple
17 circular lubricant seal 18 O-Ring seals for lubricant

SJ Mod.A Series Acme screw jacks with travelling screw:

14 sizes standard available
Acme screw from Ø 18 mm to Ø 160 mm
Load capacity from 5 kN to 1.000 kN

Available accessories (*):
Stroke length limit device (magnetic or inductive proximity)
On request, execution with axial adjustment of the proximity sensors’ position or angular position
Incremental or absolute encoder for positioning control
Prepared for IEC standard motors, AC or DC motors, and brushless servomotors (special motor flange adapter available upon request)
Screw jack housing fixing holes (threaded tapped holes on both housing fixing planes or through holes)
Stop the nut device to prevent the ball screw from travelling out of the screw jack housing
Protective tube
Anti-turn device
Trunnion mount
Protective bellows
Worm wheel rotation detector
Safety nut
Acme thread wear level check

More options upon request (*):
Fixing attachments in stainless steel AISI 303, AISI 304, on request AISI 316
Lubricants for high or low ambient temperature
Lubricants suitable for the food industry


Screw jacks SJ Series with 1-start Acme screw