Standard trapezoid (30 x 11.5 mm) diamond shoes will fit most Edco 2G and Blastrac walk-behind grinders, because both machines use the universal trapezoid / HTC-style pocket mounting. However, fitment is not only about shape—the holder angle, clip style, and segment height must match your specific model. Edco 2G uses a magnetic or bolt-on trapezoid pocket; Blastrac machines often use a 3-hole puck or a quick-change trapezoid. Before ordering, measure your existing shoe pocket and compare the footprint, hole spacing, and clip direction. Tools such as Diamond Trapezoid Grinding Disc (JOY-TP-R3) and Double Rhombus Segment Trapezoid Disc (JOY-TP-RH2) are made to the common trapezoid standard, but WerkMaster-specific pockets need a different line like WerkMaster Double Rhombus Shark Segment (JOY-WMS-R2).
| Standard | Used on | Shape |
|---|---|---|
| Trapezoid (HTC-style) | Edco 2G, Blastrac, Superabrasive, Husqvarna | Trapezoid block with bevel |
| 3-hole puck | older Blastrac, some Klindex | Round/rectangular puck with 3 holes |
| WerkMaster quick-change | WerkMaster machines | Bar / teardrop segments |
The Edco 2G grinder uses a three-head planetary with trapezoid pockets. Most universal trapezoid shoes, including rhombus-segment trapezoid discs, drop straight in. Confirm that the bevel direction matches the pocket: left- and right-hand pockets require symmetric segment placement so the cutting edge leads.
Blastrac has used several holders over the years. Older BMG models use a 3-hole bolted puck; newer units accept trapezoid shoes. If your machine has a magnetic pocket, trapezoid blocks work directly. If it is a bolt-on puck, you may need an adapter plate rather than a different diamond bond.
If you send photos of your current shoe pocket to the supplier, they can match the holder exactly. WerkMaster Double Bar Segment (JOY-WMS-B2) is an example of a machine-specific segment line—correct for WerkMaster, wrong for Edco.
The most common error is buying by grit only and ignoring the holder. A 30/40 shoe that fits an Edco will not bolt onto an older Blastrac puck, no matter how good the bond is. The second error is reversing left/right segments, which causes chatter and uneven wear.
Once you confirm your holder standard, buy spares by that standard rather than by machine brand. A trapezoid shoe is a trapezoid shoe, regardless of whether it came in an Edco, Blastrac, or Superabrasive box. Stock two or three grits in the same holder shape so you can step through the sequence without changing adapters. If you run a mixed fleet, keep a small adapter kit on the shelf—it is cheaper than buying dedicated tooling for every machine. Label each pocket orientation so left- and right-hand segments do not get swapped by mistake.
When in doubt, order a single sample set first. Run it on a spare patch of floor and check fit, wear rate, and cut quality before committing to a bulk order. Reputable factories accept sample orders because they expect professional buyers to test fitment on real machines before repeat purchasing.
A: Yes, in nearly all cases. The Edco 2G uses the industry-standard trapezoid pocket. Confirm bevel direction when you load them.
A: Newer Blastrac models share the trapezoid standard and are interchangeable with Edco. Older 3-hole Blastrac pucks are not.
A: Only if your machine uses a non-standard pocket. Many manufacturers sell adapter plates that let trapezoid shoes mount to 3-hole puck holders.
A: Torque to the machine manual’s spec—usually 12–15 Nm. Over-tightening cracks the shoe; under-tightening lets it chatter.
Most Edco 2G and modern Blastrac grinders accept standard trapezoid shoes, but always verify the pocket shape, retention method, and bevel direction before ordering. When in doubt, send photos of your existing holder—fitment matters as much as grit and bond.
