does this have mounting screws on the bottom?

There is one recessed Allen head bolt in the center. Not sure if it's for mounting or holding the the guts together. But no other holes.

Does one hand pump work for all units? When you say, "only retracts with heavy gravity" , how much weight are you talking about?

Dear， we need to know what's your hand pump, for example if you want to buy the 50t jack, you need a hand pump like the product( amazon code: B06Y1HKMVC， search it on amzon , you will find it), but if you want more efficient， we advise you to choose electric hydraulic pump. About the "only retracts with heavy gravity", we are sorry, the jack doesn't need to retract with heavy gravity, it will retract by itself when the pump pressure relief, we will change our description.

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🚀 Elevate your projects with power and precision—never miss a lift!

MULTI ANGLE OPERATION - Use horizontally, vertically, or inverted—flexibility that adapts to your worksite.
EXTENDED 4 INCH STROKE - Gain extra reach for versatile, precise height adjustments on any job.
POWERFUL 20 TON CAPACITY - Lift heavy machinery and equipment with confidence and ease.
AUTOMATIC PISTON RETRACTION - Effortless reset after lifting—no manual pushback needed.
DURABLE RUST RESISTANT FINISH - Sleek lacquered surface protects against corrosion for long-lasting performance.

The NEWTRY 20 ton Hydraulic Cylinder Long Jack features a robust 20-ton lifting capacity with a 4-inch stroke for extended reach. Its smooth lacquered, rust-resistant surface ensures durability, while the automatic piston retraction streamlines operation. Designed for multi-angle use, this heavy-duty hydraulic ram is ideal for demanding industrial, shipbuilding, and construction applications.

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阿里·H.

发货快，包装精良。Leatherman 工具手感非常高档和坚固。

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整个订购过程中沟通顺畅。产品完美。

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Manufacturer	NEWTRY
Brand	NEWTRY
Package Dimensions	20.2 x 18 x 14.9 cm; 6.14 kg
Item model number	YX503
Manufacturer Part Number	YX503
Item Weight	6.14 Kilograms

NEWTRY 20 ton Hydraulic Cylinder Long Jack 4” Stroke Porta Power Ram Jack Lifting Cylinder Retract Automatically for Shipbuilding Bridge Construction

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