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Non-Sparking Tool Inspection Standards

Inspection Standards for the Open-End Wrench, Box-End Wrench and Combination Wrench
1. Visually check that the wrench handle and head are flat and straight. Check that the wrench exterior has uniform grinding pattern without any cracks. Allowable thickness tolerance for wrenches that are less than 32mm thick is 1mm, while for wrenches that are over 32mm thick, the allowable amount is 1.5mm.
2. The basic dimensions and tolerance range should be inspected against the related technical standards.
3. For wrenches with a thickness below 32mm, the number of 1mm2 defective spots that are allowed to exist within the notch of wrench head is limited to 3. For wrenches with a thickness above 32mm, a maximum of 3 defective spots with an area of 2 mm2 apiece is allowed to occur within the notch of the wrench head.

Inspection Standards for the Box-End Striking Wrench and Open-End Striking Wrench
1. Be sure the wrench handle and head are flat and straight as well as well without cracks. For striking wrenches with a thickness below 32mm, the maximum allowable thickness tolerance is 1mm. For wrenches with a thickness between 32mm and 150mm, the maximum allowable amount is 2mm.
2. Basic dimensions and tolerance range are checked against the related technical standards.
3. For striking wrenches with a thickness below 32mm, the number of 1mm2 defective points which are allowed to exist within the notch of the wrench head is limited to 3. For striking wrenches with a thickness between 32mm and 80mm, the number of 3mm2 defective spots that are allowed to exist within the notch is limited to 3. For striking wrenches with a thickness above 80mm, the maximum allowable number is 3.

Inspection Standards for Adjustable Wrenches
1. Check the flexible wrenches for any cracks or damages caused by forging. Be sure that the wrench head and handle are flat and straight.
2. Check that the movable jaw can slide smoothly across the whole length of the guide rail.

Pipe Pliers Inspection Standards
1. Inspect all the parts on the pipe pliers for cracks, metal burr, clamping damages, oxide layer, or other surface defects. Be sure that the wrench head and head are flat and straight.
2. Turn the screw by hand to see whether the movable jaw can slide smoothly across the whole length of the guide rail.

Hammers Inspection Standards
1. Check that the hammer head is well shaped, clear-cut and symmetrical on both sides. Inspect the hammerhead surface for any cracks or burr.
2. Basic dimensions and weight should be controlled within the tolerance range.
3. Be sure the hammerhead and handle are flat, straight and tightly attached to each other.

F-Shaped Wrench Inspection Standards
Check that the two jaws of wrench are symmetrical and kept in a straight line with the handle. Inspect the jaws against any cracks, obvious clamping marks, sand holes or oxide layers that affect the surface quality

Screwdriver Inspection Standards
Check that the axial shaft of the screwdriver is kept in a straight line with the handle. Inspect the shaft surface against any clamping marks.
Water Pump Pliers Inspection Standards
1. Visually check the exterior of the pliers for parallelism and symmetry. Be sure that the pliers are clear cut without cracks or burr.
2. Rotating parts should move flexibly. Check that the blades are well shaped and cutting teeth are distinct.

Inspection Standards for Other Non-Sparking Tools
1. Check the tool surface for any burr or cracks.
2. For tools with handles, be sure to inspect that the handle and head are kept in a straight line and tightly attached to each other.
3. For tools with blades, check the cutting edge for any blade porosity or deformation.