WEN 20V Max Brushless Auto-Speed Cordless Jigsaw (20670) review

The “Auto-Speed” name and the manual do not agree on one number

WEN sells the 20670 and 20670BT as brushless Auto-Speed jigsaws. The exact product pages describe a variable-speed adjustment dial reaching 3,300 strokes per minute, but the shared model-specific manual lists 0–3,100 SPM. For a conservative source-based comparison, this assessment uses the manual’s 3,100 SPM figure and explicitly retains the product-page discrepancy. The manual describes a dial and advises matching speed to material, blade, thickness and feed; the marketing name by itself is not enough to infer how a control automatically responds under load.

The package suffix also matters. WEN’s exact 20670 page and the shared manual identify a 4.0Ah battery and 20V, 2A charger with model 20670. The same manual says 20670BT does not include either. The exact 20670 kit-page image shown with this review is a page picture, not an inventory substitute; use the packing list and offer’s exact model to confirm contents.

Material guidance and published capacities

The manual lists a one-inch stroke, 4 inches of wood capacity and 3/8 inch of metal capacity. These are WEN’s published limits, not independent cut tests. It names setting 0 for hard material such as metals or thin sheet; setting 1 for soft material when a cleaner cut or delicate scroll is wanted; setting 2 for medium-density stock such as harder wood or particle board; and setting 3 for softer material such as wood or plastic when a faster cut matters more than a clean edge. The selector has four positions, with 0 as the straight path and the higher positions adding orbital movement. As with the other WEN 20V models in this group, the chart is guidance, not proof of a finish on a specific blade and workpiece.

The exact page identifies a brushless motor, LED work light, T-shank wood blade, straight fence guide and 4.0Ah kit battery. Unlike the 20661 and 20667 page lists, the 20670 package list names a wood blade but not a metal-cutting blade; the manual likewise lists a wood blade. Do not count on a metal blade being in the box just because WEN reports a metal capacity. Choose a blade whose shank fits and whose maker identifies it for the actual material.

Dust port, blower and bevel

WEN’s exact pages describe a chip blower, a 1.5-inch rear dust port for connecting a dust-collection device, and a tool-free beveling footplate. The manual documents shoe adjustment to 45 degrees left or right but does not provide the dust-port diameter in its specification or packing list. In contrast with that page/manual silence, the 20661 and 20667 manuals do state a 1.4-inch (35 mm) port. For 20670, use the page’s 1.5-inch figure as a manufacturer claim and verify the real port, any adapter and your vacuum hose before purchase. WEN does not say that attaching a collector turns off the chip blower or prevents beveling, so this assessment does not invent that restriction. A vacuum is not part of the stated kit.

How to compare the 20670

The 20670 may suit a buyer who wants a brushless WEN 20V Max top-handle saw, 4.0Ah kit, orbital choices and a beveling shoe. Its manual-listed wood capacity is lower than the 20667’s 4.72-inch figure and its listed metal capacity is the same as the 20667’s 3/8-inch figure; those are nominal manufacturer specifications, not comparative tests. The manual weight is 4 pounds and the dimensions are 8.70 by 3 by 8.25 inches, but they are not measurements made here. The tool-only 20670BT shares the body but omits the kit battery and charger.

Do not use the “Auto-Speed” phrase or the 3,300 SPM page claim as a test result. The model manual is the clearer operating reference and says 3,100 SPM; check the exact package and revision if the maximum speed is critical. Likewise, the material capacity numbers do not establish ceramic or cast-iron use. For metal, WEN’s setting chart identifies straight action at 0 and asks users to choose an appropriate blade.

Exact-version checks

Before ordering, confirm whether the offer is 20670 or 20670BT, whether the 4.0Ah pack and charger are present, and whether the dust connection fits the extractor you have. The shared manual warns that some tools may not be compatible with WEN’s 1.5Ah 49120B pack, so verify battery compatibility rather than relying only on a family label. This assessment uses WEN’s exact 20670 kit page, its exact 20670BT tool-only page and the 20670/20670BT manual. No hands-on use, test cuts, current price or retailer availability is claimed.