Irwin Vise-Grip 21 Locking C Clamp 18 Inch
- Material Type: Special Alloy Steel
- Item Weight: 2.4 pounds
- Unit Count: 1
- Color: Silver
Last refreshed Aug 4, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A solid traditional bar clamp from a long-established clamp maker, worth choosing if a screw-driven design suits the work better than a trigger clamp.
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ASIN: B00004SBBIModel: 18RCategory: Clamps
Overview
The Irwin 21 is a bar clamp from Irwin's woodworking clamp line, weighing about 1.09 kilograms (roughly 2.4 pounds), used for holding glued joints and stock in place during assembly.
Irwin has made woodworking clamps for generations, and the 21 sits in that lineage as a screw-driven bar clamp rather than a quick-trigger model. At just over a kilogram, it has enough heft for real clamping pressure on furniture-scale joints, though the listing does not specify bar length or maximum opening, so confirm those dimensions before ordering if a specific reach is needed.
- Screw-driven bar clamp
- About 1.09 kg build weight
- Irwin woodworking clamp line
- Model 21
Who it's for
Fits woodworkers and furniture builders who want a traditional screw-clamp for glue-ups and general shop holding, rather than a lightweight trigger clamp. Not the choice for anyone needing the exact opening capacity confirmed in advance, since that dimension is not listed here.
Pros and cons
- Substantial build weight for real clamping force
- Traditional screw mechanism gives controlled pressure
- From an established clamp manufacturer
- Bar length and maximum opening are not listed
- Slower to operate than a trigger clamp
Performance notes
As a screw-driven clamp, the 21 tightens by turning a handle rather than squeezing a trigger, which trades speed for higher, more controllable clamping pressure. That makes it better suited to final glue-up pressure than to quick tack-holding.
Specifications
| Brand | Irwin |
|---|---|
| Model | 18R |
| Dimensions & fit | |
| Item Weight | 2.4 poundshigher than 72% of 222 clamps |
| Item Dimensions | 18.1 × 7 × 1.5 inches |
| Construction & materials | |
| Material Type | Special Alloy Steel |
| Color | Silver |
| Included components | |
| Unit Count | 1 |
| Included Components | CLAMP LOCKING 18R 18"/REG TIP |
| Other details | |
| Style Name | Classic |
| Item Type Name | CLAMP LOCKING 18R 18"/REG TIP |
Closest rivals on specs
COGNATIVE Mini Table Clamp Bench Vise 2"- Item Weight 2.4 vs 2.16 pounds (+11%)
Frequently asked questions
What type of clamp is the Irwin 21?
It is a screw-driven bar clamp from Irwin, built for woodworking glue-ups and general shop clamping.
How much does the Irwin 21 weigh?
About 1.09 kilograms, roughly 2.4 pounds.
Does the Irwin 21 use a trigger or a screw to tighten?
It tightens with a screw handle rather than a squeeze trigger, giving more controlled clamping pressure.