Flush Trim Bit vs Pattern Bit: Which One Should You Buy?

LaserEngraveHQ earns a commission from purchases made through these links, at no extra cost to you. Read our affiliate disclosure.

Flush trim bit vs pattern bit: what the bearing position changes

A template bit copies a shape. The template is fixed to the workpiece, the pilot bearing rides the template edge, and the cutting edges rout the workpiece into a duplicate of the template. The Amana listing describes exactly this motion: the bearing rides along the template edge while the cutters form an exact duplicate.

Where the bearing sits decides the setup. With the bearing at the tip, the template is fixed to the far side of the workpiece, and the tip bearing follows the template edge while the cutters duplicate it in the workpiece. With the bearing at the shank end, the template sits between the router base and the workpiece, and the bearing follows the template edge while the cutters work below it. Both arrangements copy the same shape; they differ in which side of the workpiece carries the template.

The listings in this guide name both positions. The Amana 45487 listing states an upper ball bearing and calls the bit a flush trim plunge template bit: with the bearing at the shank end, the tip is free to plunge into the workpiece. The SHARPRO listing states a bottom bearing. Read the bearing position in each listing rather than the product name alone, because names vary and the bearing position is what sets the setup.

The four bits in this guide

Ranked by stated build, warranty and usefulness for template work:

If you need	Look at
A shank-end bearing from a long-standing industrial maker, with a lifetime guarantee stated	Amana Tool 45487: 1/2-inch diameter, 1/2-inch cutting height, 1/4-inch shank
A longer cut from the same maker with the same guarantee stated	Amana Tool 47104: 1/2-inch diameter, 1-inch cutting height, 1/4-inch shank
2 bits in one pack with a coated compression design and a bottom bearing	SHARPRO: 1/4-inch shank, 1-1/4-inch cutting length, 3-inch overall length
A 1/2-inch shank with the longest cutting height stated here	Yonico 14142: 1/2-inch shank, 2-inch cutting height, 1/2-inch diameter

Amana Tool 45487

The listing states 1/2-inch diameter, 1/2-inch cutting height and 1/4-inch shank, with an upper ball bearing and carbide-tipped cutters. It is listed for template and pattern routing of parts, joints and internal cuts, in handheld and table-mounted routers. The maker describes itself as an industry leader for over 50 years, and the spec table states a Limited Lifetime Guarantee. The 1/2-inch cutting height is the smallest stated in this guide.

Amana Tool 47104

The listing states 1/2-inch diameter, 1-inch cutting height and 1/4-inch shank, with 2 flutes and carbide-tipped cutters listed as excellent for template work. The spec table states a Limited Lifetime Guarantee, spelled “Gaurantee” in the listing. The bearing position is not stated in the title or bullets, so confirm it on the listing before planning a template setup.

SHARPRO 2-pack

This is a 2-pack of compression flush trim bits with a 1/4-inch shank, 1-1/4-inch cutting length and 3-inch overall length, and the listing states a bottom bearing. The listing names a TAC coating, a dual-bearing system and an optimized helix angle, and lists hardwoods, softwoods, MDF and plastic materials. It names BOSCH, Dewalt, Milwaukee and Whiteside routers plus CNC pattern milling and engraving machines as compatible. No warranty term is stated.

Yonico 14142

The title calls it a pattern bit flush trim with 2-inch cutting height, 1/2-inch diameter and 1/2-inch shank. The bullets list C3 micro-grain tungsten carbide blades and silver induction brazing, for table mount and handheld routers. The spec table lists 1 flute, the only single-flute bit in this guide. The bearing position is not stated, and no warranty term is stated.

How to choose

Match the bearing position to where you want the template. If the template must sit on the router side of the workpiece, pick a bit whose listing states the bearing at the shank end; if the template sits on the far side, pick a tip-bearing bit. Then match the shank to the router collet: the SHARPRO and both Amana listings state a 1/4-inch shank, while the Yonico states a 1/2-inch shank, and the shank size comparison explains the trade-off. Compare the cutting heights the listings state, 1/2 inch, 1 inch, 1-1/4 inches and 2 inches, against the stock you shape most often. For wider bit choices, see the best CNC router bits roundup and the CNC bit set guide.

FAQ: lasers and CNC

Can I use a flush trim bit in a CNC router?

The SHARPRO listing names CNC pattern milling and engraving machines as compatible, and the Amana 45487 listing names handheld and table-mounted routers. Check the shank size against the collet and the bearing position against the cut you plan.

Which bit puts the template on top of the workpiece?

A bit with the bearing at the shank end: the template sits between the router base and the workpiece, and the bearing rides the template edge. The Amana 45487 listing states an upper ball bearing, which is the shank-end position.

Does cutting height matter for template work?

The cutting height is the length of the cutting edges the listing states, from 1/2 inch to 2 inches across the four bits here. A taller cutting height shapes deeper edges in a single setup.

What does the flute count change?

The listings here state 2 flutes on the Amana and SHARPRO bits and 1 flute on the Yonico. Flute count is a stated spec worth comparing when two bits otherwise match.

Do these bits cut materials other than wood?

The Amana 45487 listing names woodworking, plastics, aluminum, composite and metal industries, and the SHARPRO listing names plastic materials alongside hardwoods, softwoods and MDF. Match the material to the listing that names it.

Related: the roundover bit vs ogee bit comparison, shank router bits and router table vs CNC router. Also see the best CNC router bits roundup.