C Clamp Types and Uses
C clamp types by jaw opening, throat depth and handle: four sets from 3 to 8 inches compared, with clamping force, materials and pack sizes.
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Top picks at a glance
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- 1
8 Pcs C Clamp 4 Inch Heavy Duty Steel C Clamp Set9.6/10View on Amazon - 2
RHBLME 4 Pack Heavy Duty C Clamp9.6/10View on Amazon - 3
6-Inch Industrial C-Clamp Set (4-Pack)9.6/10View on Amazon - 4
WILLBOND 4 Pcs C Clamps Set 3'' 4'' 6'' 8'' Small9.5/10View on Amazon
When a glue-up needs boards held flat while the glue sets, or steel pieces need holding steady for a weld, the clamp that does the job is a C-clamp, and c clamp types come down to jaw opening, throat depth and handle. The sets compared here cover a single-size forged steel set, a malleable iron set with a stated clamping force, a mid-size set with a wide swivel pad, and a mixed set in several sizes. Match the jaw opening to the stock and the throat depth to how far in from the edge the clamp must reach.
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8 Pcs C Clamp 4 Inch Heavy Duty Steel C Clamp Set
An 8-pack of 4-inch heavy-duty C-clamps with cast iron frames, a 4.4-inch maximum jaw opening, 2-inch throat depth and 1,125 lbs of clamping force.
Pros
- 1,125 lbs of clamping force stated, the highest here
- 8-pack covers more clamping points in one buy
- Swivel jaw pad adapts to various surfaces
- Galvanized finish resists rust and moisture
Cons
- No warranty term is stated
- Only the 4-inch size is offered, with no larger sizes in the set
- 2-inch throat depth is the shallowest here
- Heaviest pack here by stated weight
RHBLME 4 Pack Heavy Duty C Clamp
A 4-pack of 5-inch heavy-duty C-clamps in malleable iron with up to a 5-inch jaw opening, 3-inch throat depth and a 0.8-inch swivel pad.
Pros
- 5-inch jaw opening with 3-inch throat depth
- 0.8-inch swivel pad spreads pressure and reduces marring
- Ductile cast iron with rust resisting finish
- T-bar handle offers maximum torque with less hand fatigue
Cons
- No warranty term is stated
- Only one size in the pack, with no smaller or larger clamp included
- No clamping force is stated
- No larger size is included for stock over 5 inches
6-Inch Industrial C-Clamp Set (4-Pack)
A 4-pack of 6-inch industrial C-clamps in forged steel with a 6-inch jaw opening and 3-inch throat depth.
Pros
- 6-inch jaw opening for thick stock
- Forged steel construction for stability
- Protective coating resists moisture, rust and corrosion
- Screw mechanism allows one-handed adjustment
Cons
- No clamping force is stated
- Only one size in the set, with no smaller clamp for light work
- No T-bar handle is stated, unlike the other sets
- No swivel pad is stated to spread pressure
WILLBOND 4 Pcs C Clamps Set 3'' 4'' 6'' 8'' Small
A 4-piece set of steel C-clamps in 3, 4, 6 and 8 inch sizes with sliding T-bar handles.
Pros
- Four sizes in one set: 3, 4, 6 and 8 inches
- Steel construction, stated sturdy and reusable
- Sliding T-bar handle for maximum torque
- Adjustable positioning screws for clamping tabletops and wood strips
Cons
- No clamping force is stated
- No throat depth is stated for any size
- No swivel pad is stated to protect the work surface
- Four different sizes mean only one clamp of each size
C clamp types at a glance
| Clamp | Jaw opening | Throat depth | Pack |
|---|---|---|---|
| Lukdin 6 in C-Clamp | 6 in | 3 in | 4-pack |
| MYFAMIREA 4 in C-Clamp | 4.4 in max | 2 in | 8-pack |
| RHBLME 5 in C-Clamp | Up to 5 in | Up to 3 in | 4-pack |
| WILLBOND 3-8 in Clamps | 3, 4, 6 and 8 in sizes | Not stated | 4-piece mixed set |
Single-size forged steel clamps
The Lukdin set is the forged steel clamp here: 4 clamps at 6 inches, with a 6-inch jaw opening and 3-inch throat depth. The maker states forged steel construction with a protective coating against moisture, rust and corrosion, and a widened gripping surface that prevents shifting during work. The screw mechanism allows one-handed adjustment.
Malleable iron clamps with a stated clamping force
The MYFAMIREA set is the only one here with a stated clamping force: 8 clamps at 4 inches, with a 4.4-inch maximum jaw opening, 2-inch throat depth and 1,125 lbs of clamping force. The maker states heavy-duty solid cast iron with a bright galvanized finish, a sliding T-handle and a swivel jaw pad. The maker lists the set for metalworking, woodworking and welding.
Mid-size clamps with a wide swivel pad
The RHBLME set is the mid-size clamp here: 4 clamps at 5 inches, with up to a 5-inch jaw opening, up to a 3-inch throat depth and a 0.8-inch swivel pad diameter. The maker states heavy-duty ductile cast iron with a rust resisting finish, and a larger swivel pad that spreads pressure evenly and reduces marring. The T-bar handle offers maximum torque with smooth, easy twisting.
Mixed-size clamp sets
The WILLBOND set is the mixed set here: 4 steel clamps in 3, 4, 6 and 8 inch sizes, with sliding T-bar handles. The maker states the clamps are sturdy and solid, not easy to break or rust, with a screw that runs smooth without jamming. Adjustable positioning screws let the clamp fit most tabletops and wood strips.
C-clamps to buy
The clamp is picked once the stock thickness and the reach from the edge are known, so match the stated jaw opening to the stock and the throat depth to the reach.
How to choose the best c clamp types
Match the jaw opening to the stock
Lukdin states a 6-inch jaw opening, RHBLME states up to 5 inches, and MYFAMIREA states a 4.4-inch maximum opening. WILLBOND covers 3, 4, 6 and 8 inch sizes in one set. Pick the opening from the thickest stock the clamp must close over. Our C-clamp parts guide covers replacement options for worn parts.
Check the throat depth
Lukdin and RHBLME state a 3-inch throat depth, MYFAMIREA states 2 inches, and WILLBOND states no throat depth. A deeper throat reaches further in from the edge of the work, so check the stated depth against where the clamp must grip.
Look at the handle and the pad
MYFAMIREA, RHBLME and WILLBOND all state sliding T-bar or T-handles, while Lukdin states a screw mechanism with one-handed adjustment. MYFAMIREA and RHBLME state swivel pads that adapt to the surface and spread pressure, while Lukdin and WILLBOND state none. A swivel pad matters where the clamp must grip without marring the surface. For holding panels square while welding, see our best welding magnets for body panels picks.
Read the manual before first use, wear eye protection, keep the work area clear and ventilated, and stay within every stated rating. Read our Safety Disclaimer.
FAQ: garage tools
What is the jaw opening on a C-clamp?
Lukdin states 6 inches, RHBLME states up to 5 inches, and MYFAMIREA states a 4.4-inch maximum opening. WILLBOND lists its clamps by size at 3, 4, 6 and 8 inches.
What does throat depth mean on a C-clamp?
Throat depth is how far in from the edge of the work the clamp can grip: Lukdin and RHBLME state 3 inches, MYFAMIREA states 2 inches, and WILLBOND states no throat depth.
How much clamping force do these C-clamps state?
Only MYFAMIREA states a clamping force, at 1,125 lbs. Lukdin, RHBLME and WILLBOND state no clamping force, so compare them on jaw opening, throat depth and build instead.
Do any of the sets include more than one size?
Yes. WILLBOND includes 4 clamps in 3, 4, 6 and 8 inch sizes. The other three sets are single-size: Lukdin at 6 inches, RHBLME at 5 inches and MYFAMIREA at 4 inches.
Which C-clamp set is best for welding?
All four sets list welding among their uses. MYFAMIREA states the highest clamping force at 1,125 lbs, while Lukdin states a 6-inch jaw opening for larger pieces.
Related: C-clamp parts and replacements, types of exhaust clamps and our garage upgrades hub.
