Micro Square Rotary Broaches (8mm x 28mm OAL)

Polygon Solutions’ 8mm shank x 28mm overall length square rotary broaches are precision ground with a tolerance of +0/-.0005. Each nominal size conforms to the industry standard – ANSI B18.3 2003. All 8mm shank diameter x 28mm overall length square rotary broach tools include a pressure relief vent hole that allows air and fluid to freely escape during the rotary broaching process to reduce wear on your machine and extend rotary broach tool life.

8mm Shank Diameter x 28mm Overall Length
All Broaches Larger than 5/64″ Include Pressure Relief Vent Hole

Nominal Size (Inches)	Across Flats (A)	Broaching Depth (B)	Includes Vent Hole	Part Number	Price	Order
.050″ Square Micro Rotary Broach	.0510	.102		S00510C	$54.00
1/16″ Square Micro Rotary Broach	.0635	.127		S00635C	$54.00
5/64″ Square Micro Rotary Broach	.0790	.158		S00790C	$54.00
3/32″ Square Micro Rotary Broach	.0950	.190		S00950C	$54.00
7/64″ Square Micro Rotary Broach	.1110	.222		S01110C	$54.00
1/8″ Square Micro Rotary Broach	.1265	.253		S01265C	$54.00
9/64″ Square Micro Rotary Broach	.1425	.285		S01425C	$54.00
5/32″ Square Micro Rotary Broach	.1585	.317		S01585C	$54.00
11/64″ Square Micro Rotary Broach	.1740	.348		S01740C	$54.00
3/16″ Square Micro Rotary Broach	.1895	.379		S01895C	$54.00
7/32″ Square Micro Rotary Broach	.2215	.443		S02215C	$54.00

Nominal Size (Metric)	Across Flats (A)	Broaching Depth (B)	Includes Vent Hole	Part Number	Price	Order
1.30mm Square Micro Rotary Broach	.0515	.103		S00515C	$54.00
1.50mm Square Micro Rotary Broach	.0610	.122		S00610C	$54.00
2mm Square Micro Rotary Broach	.0810	.162		S00810C	$54.00
2.50mm Square Micro Rotary Broach	.1010	.202		S01010C	$54.00
3mm Square Micro Rotary Broach	.1210	.242		S01210C	$54.00
4mm Square Micro Rotary Broach	.1610	.322		S01610C	$54.00
5mm Square Micro Rotary Broach	.2000	.400		S02000C	$54.00

• Custom Dimension
• Cut Length
• Dish Angle
• Vent Holes
• Tolerance
• Corner Radius

Our Square Rotary Broaches can be ordered in custom dimensions. Can’t find the size you’re looking for? Polygon Solutions provides fast delivery on custom ½” or 8mm shank square rotary broaches. Simply specify the desired across flat dimension when ordering. Polygon’s manufacturing tolerance is +0/-.0005”. For example, a custom square broach with 0.1234” across flat dimension is part number S01234B.

If you need a square rotary broach to cut deeper than our standard dimensions, perhaps to clear a counter-bore, you can request a custom cut length. Custom cut lengths may be limited by the back-taper on the side of the square broach, or manufacturing limitations. Please call (239) 628-4800 for more information. Rotary broaching more than 1-2x the across flat dimension may not be successful. Broaches may also be weakened because of a deeper cut length.

The standard rake angle (also called the dish angle) is critical to help the chip curl while rotary broaching. However, the rake angle can be modified to suit specific materials. For example, some softer materials may require a steeper angle. Broaching tougher materials may be improved with less, or no rake angle. Please call (239) 628-4800 for more information.

Single vent holes are standard with square rotary broach forms larger than .079″ and allow air and/or fluid to pass though the hex broach and reduce any hydraulic pressure that may occur when broaching a blind hole. Polygon’s rotary broach tool holder is also designed with this feature. However, an additional cross vent hole can be added for holders without the pressure relief system.

All of Polygon Solution’s square rotary broaches are manufactured with a +0/-.0005” tolerance. However, square broaches can be manufactured to a tighter +0/-.0004” tolerance. If you want to use the broach as a gauge, the square broach can also be manufactured without a back-taper. For more information, see Rotary Broach Gauges.

If you part allows for a corner radius, we can add a spun ground diameter to the square broach to remove the sharp corners. The spun ground diameter is useful for reducing the chip size and pressure required for long tool life and successful rotary broaching operations.