Pfaff-Silberblau STW-F Steel Jack with Fixed Claw

Model STW-F | Capacity 1,500 kg to 10,000 kg | Lift 300 to 350 mm | Fixed Lifting Claw | DIN 7355 | Siku or Raku Crank

The Pfaff-Silberblau STW-F is the universal application steel jack with a fixed lifting claw, certified to DIN 7355. Robust steel design with toothed rack of solid material, hardened gearing parts, and precisely machined teething for extended service life. The fixed claw at the lower position enables low-clearance load pickup. Available in four capacities and two crank options (Siku or Raku). The lightest in the Pfaff steel jack range: STW-F 15 at just 12 kg.

Technical Specifications

Height of Lift = Height A + Lift. STW-F 100 Raku is 28 daN at WLL versus 40 daN Siku (Raku has slightly higher mechanical advantage at 10 t). STW-F Sifeku available on request.

Key Features

• Precisely machined gearbox: Optimal gear ratio ensures minimum operator effort and smooth operation.
• Hardened gearing parts: Low wear and extended service life under demanding industrial conditions.
• Load held in any position: Self-energising load brake generates axial pressure proportional to load weight, securely holding the load when the crank is released.
• Robust steel construction: Steel design with toothed rack of solid material for industrial and outdoor use.
• Load support on claw or head: No reduction of capacity when lifting on the claw, full WLL available at any rated position.
• Robust steel rack and gearing: Solid steel rack and hardened gearing for extended service life.
• Fixed lifting claw, low-clearance pickup: Lift loads directly from floor level.
• Lightest in the Pfaff range: STW-F 15 at 12 kg, easily portable.
• Siku or Raku crank: Same WLL and hand effort across both crank types.

Suitable Applications

Traditional universal steel jack. Applications: vehicle and machinery maintenance, agricultural workshops, construction and formwork support, fabrication, shipbuilding, rail maintenance, forestry equipment.

How to Use the Pfaff-Silberblau STW-F Steel Jack with Fixed Claw

1. Confirm rated capacity: Verify the WLL stamped on the jack matches or exceeds the load weight.
2. Position on a firm surface: Place the jack on level, firm ground capable of supporting the load.
3. Position the load: Centre the load directly above the claw or head, ensuring vertical alignment. No side-loading.
4. Engage the load: Slowly raise the claw or head until stable contact with the load.
5. Lift using the crank: Apply steady, controlled rotation. The load brake holds position automatically when the crank is released.
6. Lower the load: Reverse crank direction to lower at a controlled rate.

Warning: Pfaff jacks are not for passenger lifting. STW-F 100 Siku requires 40 daN at WLL.

Safety Information

• Always inspect the jack before each use (base plate, rack, gear housing, crank).
• Never exceed the Working Load Limit stamped on the jack body.
• Use only the manufacturer-approved crank, never with extension bars or mechanical drives.
• Never use on soft ground, ice, or unstable surfaces.
• Never side-load, angle-load, or use the jack to lift persons.
• For sustained load support, place additional supports beside the jack before any work beneath the load.
• LOLER 1998 thorough examination required every 12 months where used as lifting equipment.

Inspection and Maintenance

Inspect rack, gear housing, claw, and crank before each use. Lubricate annually. The load brake is sealed and self-adjusting. WOLFF Onsite provides LOLER inspection, spare parts, and overhaul.

Optional Accessories

• Pfaff Cranks: Replacement Siku, Raku, or Sifeku cranks.
• Pfaff Worm Gear Drive S20 / S24: Hand-operated gearbox for reduced effort.
• LOLER inspection and overhaul: WOLFF Onsite service.

Downloads

• Pfaff STW-F / STW-FvB Datasheet (EN, 2024) , full spec tables and dimensional drawings (PDF)

Frequently Asked Questions