As an Amazon Associate I earn from qualifying purchases. Buying through these links costs you nothing extra.
The ZOFORTY 8 inch C clamp set has four green C-clamps with an 8 in. opening, a 2.9 in. throat, cast and ductile iron construction, a sliding T-handle and swivel pads. The listing quotes 5,900 lb of clamp force. It suits fixtures, glue-ups and repairs. The shallow throat means it will not reach far into wide panels. This review is based on the Amazon listing, not hands-on testing.
ZOFORTY 8 Inch C Clamp Set at a Glance
| Item | Per the listing |
|---|---|
| Brand | ZOFORTY |
| Quantity | 4 clamps |
| Jaw opening | 8 in. |
| Throat depth | 2.9 in. |
| Listed clamp force | 5,900 lb (a seller figure) |
| Material | Cast iron frame with ductile iron casting, per the listing |
| Handle and pad | Sliding T-handle, swivel pad |
| Finish and color | Coated, green |
| Warranty | Not verified; check the listing |
Throat Depth Is the Number to Check
An 8 in. opening only tells you how thick a stack fits. The 2.9 in. throat tells you how far from the edge the screw reaches. If you need to apply pressure in the middle of a wide board or plate, 2.9 in. may fall short. Compare it with the 3 in. throat of other 8 in. sets before you choose.
Design Details
- Sliding T-handle. Lets you change grip and apply leverage while tightening.
- Swivel pad. Tilts to sit flat on angled or uneven surfaces.
- Threaded spindle. The listing describes smooth threading. Keep it clean and lightly oiled.
- Coated cast iron. The finish slows rust but will chip. Cast iron can crack if dropped or overloaded.
Using Them in a Welding Shop
- Clamp parts square before tacking, and use a square or magnet to check the angle.
- Keep threads clear of spatter with anti-spatter spray or a weld blanket.
- Do not use them as ground clamps and do not run welding current through the screw.
- Let work cool before handling the clamp, since the iron body holds heat.
Pros and Limitations
Pros
- Wide 8 in. opening.
- Sliding T-handle and swivel pad.
- Four matching clamps.
- Coated finish.
Limitations
- 2.9 in. throat limits reach.
- Iron pads can mark finished surfaces; use scrap wood.
- Warranty and independent load tests are not shown.
Related guides: the 4Pcs 8 inch C clamp set with a 3 in. throat, the ZOFORTY 6 inch C clamps and the 8-pack heavy-duty C-clamps.
Frequently Asked Questions
How deep is the throat on the ZOFORTY 8 inch clamp?
The listing gives 2.9 in. That is the reach from the clamp edge, so it is shallower than some 8 in. clamps with a 3 in. or deeper throat.
What is the clamp force?
The listing quotes 5,900 lb. It is a seller-stated number, so do not rely on it for safety-critical loads.
Can I use these C-clamps for welding?
Yes, to hold parts before tacking. Keep threads free from spatter, do not use them as ground clamps, and let hot work cool before you handle the clamp.
Will they mark my workpiece?
They can. Place scrap wood or a soft pad under the swivel pad and fixed jaw when you clamp finished surfaces.
Conclusion
This is a solid-looking set for shop clamping if the 2.9 in. throat is enough for your work. Check reach first, and use pads on finished surfaces.
