Eight-Piece Combination Wrench Set

BOSI's Eight-Piece Combination Wrench Set comes in a plastic clip package, with each set containing eight wrenches of different sizes. The wrenches have a mirror-polished finish, making them aesthetically pleasing and rust-proof. Sizes include: 8mm, 10mm, 12mm, 13mm, 14mm, 15mm, 17mm, and 19mm. Each wrench has a 12-point (T-shape) end and an open end to accommodate different working angles.

It conforms to standard QB/T3003. Suitable for quick loosening and tightening of hexagonal head bolts and nuts, it is widely used in automotive repair, machinery assembly, pipeline installation, equipment maintenance, and other applications.

Product Application

Automotive Repair: Used for removing and installing engine bolts, chassis nuts, and tire bolts (with sockets). The spline end can reach into narrow spaces, and the open end is suitable for quick pre-tightening.

Mechanical Assembly: When installing machine tools, pumps, valves, and transmission equipment, a multi-purpose wrench can simultaneously meet the needs of deep hole (box wrench) and surface (open-end) operations.

Pipeline Installation: For tightening flange bolts and bracket nuts, the box wrench provides greater torque and is less prone to slippage.

Furniture Assembly: For connecting bolts in large furniture, a multi-purpose wrench is more labor-saving and efficient than a regular adjustable wrench.

Home Appliance Repair: For bolts on the outer casing of equipment such as washing machines and air conditioners, the open end allows for quick disassembly.

Building Formwork: For tightening tie bolts on formwork, a multi-purpose wrench is more flexible than a single open-end wrench.

Product Comparison

FAQ

Q: When should the box end and open end be used respectively? 

A: The bolt head is completely exposed and has sufficient space, which can be quickly screwed in with the open end; When the bolt is stuck in a groove or requires a large torque, use a plum blossom end; First tighten the opening, then tighten the plum blossom.

Q: Will scratches on the wrench surface affect its use? 

A: Mirror polishing scratches do not affect functionality, but may reduce rust resistance. Minor scratches can be treated with anti rust oil. Severe scratches do not affect strength.

Q: How to choose the specifications of a combination wrench? 

A: Select a wrench of the same specification based on the bolt's cross-sectional distance (S value). For example, for an M8 bolt with a cross-sectional distance of 13mm, select a 13mm wrench. This kit covers bolts from M5 to M12.

Q: Why is the box end 12-point? 

A: The 12 angled plum blossom hole can accommodate bolts at 12 different angles, suitable for narrow spaces (can be inserted every 30 °), and more flexible than the 6-angled one.

Q: What should I do if the wrench torque is insufficient and I can't tighten a rusty bolt? 

A: Spray loosening agent first; Gently tap the tail of the wrench handle with a hammer to vibrate; Can add a set of force tube (pay attention to the limit of the wrench). If it still doesn't work, switch to an impact tool.