Plastic-coated impact socket set 790-LTPS3, 3-piece 17-19-21mm

The plastic-coated impact socket set 790-LTPS3 includes three long sockets sized 17, 19, and 21 mm. These dimensions cover the most common wheel-bolt sizes on passenger cars and light commercial vehicles. Each socket is forged from chrome-molybdenum alloy steel for impact-tool use. The outer sleeve is molded from soft plastic to cushion contact with painted or polished wheel rims. An internal rubber insert grips the bolt head to reduce scratching on decorative fasteners.

The 1/2 inch square drive accepts standard detent pins and retaining rings. Each socket complies with DIN 3121 and ISO 1174 dimensional tolerances. The six-point hex profile distributes torque evenly across bolt flats. Color coding—blue for 17 mm, yellow for 19 mm, red for 21 mm—speeds selection in busy workshops.

Construction and material of the plastic-coated impact socket set

Chrome-molybdenum steel core

The socket body is drop-forged from chrome-molybdenum alloy. This material withstands the cyclic shock loads generated by pneumatic and cordless impact wrenches. Heat treatment hardens the hex walls while maintaining ductility in the drive end. The six-point internal profile minimizes corner rounding on high-torque fasteners.

• Material: chrome-molybdenum alloy steel
• Internal profile: six-point hex
• Heat-treated for impact duty
• Drive type: 1/2 inch square with detent hole
• Compliance: DIN 3121, ISO 1174

Each socket carries a through-hole for a retaining pin and a groove for an O-ring. These features secure the socket to the anvil during high-speed operation. The long body provides clearance over extended wheel studs and recessed bolt heads.

Protective plastic sleeve

A soft polymer tube encases the outer diameter of each socket. The sleeve absorbs minor impacts against wheel spokes and rim edges. It reduces the risk of chipping painted finishes or scratching polished aluminum. The material remains flexible across a wide temperature range, from winter roadside service to summer workshop conditions.

• Sleeve material: soft plastic polymer
• Function: protects wheel surfaces from metal-to-metal contact
• Color coding: blue (17 mm), yellow (19 mm), red (21 mm)
• Internal rubber insert cushions bolt heads

The color-coded design eliminates the need to read size markings under poor lighting. Technicians can identify the correct socket at a glance, reducing cycle time during tire changes and wheel rotations.

Common applications

This set suits tire shops, mobile mechanics, and vehicle service centers that handle passenger cars and light trucks. The 17, 19, and 21 mm sizes cover wheel bolts on European, Asian, and some North American models. The plastic sleeves are especially useful when working on vehicles with aftermarket alloy wheels or factory chrome-plated fasteners. The sockets pair with 1/2 inch impact guns, torque-limiting extensions, and manual breaker bars.

Storage and organization

All three sockets ship in a rigid ABS plastic case. The case features molded recesses that hold each socket securely during transport. Snap closures keep the lid shut in toolboxes and service vans. The compact footprint fits into drawer organizers or hangs on pegboard hooks. Clear labeling on the case lid identifies the contents and size range.

Technical reference

The set contains three impact sockets with the following specifications: sizes 17, 19, and 21 mm; six-point hex internal profile; 1/2 inch square drive; compliance with DIN 3121 and ISO 1174; chrome-molybdenum steel construction; soft plastic outer sleeves in blue, yellow, and red; detent hole and O-ring groove on each drive end; supplied in an ABS storage case. Total weight of the set is 833 grams.