ER-40 Milling Machine Collets

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EAR99

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Approximate Diameter Compression

1/32"

Total Indicated Runout (TIR) Accuracy

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Shank Length

Spring Load Adjustability

Spring Load Force

For Workpiece Side

34 Products

ER Collet Sets

Collet Set with Wood

Stand

Keep a set of ER collets on hand to hold cutting tools for milling, drilling, and routing. They’re the most versatile and widely used type of collet. Spring slots clamp evenly around the shank to minimize runout for clean, accurate cuts and long tool life. The slots flex to grip slightly undersized shanks too, so you don't need an exact match for each cutting tool in your lineup. You can also use these collets in ER collet fixtures and custom setups to keep small round parts centered.

52100 Alloy Steel—Hardened 52100 alloy steel collets are made from the same tough material used to make bearings. They’re more wear-resistant than basic spring steel collets but will wear faster than hardened chrome-moly steel collets if you change bits frequently.

	ID Tolerance	Approx. Dia. Compression (Collet Size)	Max. Body Dia.	Overall Lg.	Container Type	Specs. Met		Each
ER-40 Collet







	Hardened 52100 Alloy Steel

	13	1", 1/8"-3/4" (increments of 1/16"), 7/8"	0.0002"	-0.0004" to 0"	1/32" (1/8" to 3/4")	1.61"	1.81"	Wood Stand	DIN 6499-B, ISO 15488 Form B	9411N34	0000000


	23	4 mm-26 mm (increments of 1 mm)	0.0002"	-0.0004" to 0"	1/32" (4 mm to 26 mm)	1.61"	1.81"	Wood Stand	DIN 6499-B, ISO 15488 Form B	9411N35	000000

Deburring Tool Holders


	Fixed Spring Load	Adjustable Spring Load


For Front Side	For Back Side	Tool Holder Shown Compressing

Deburr using your CNC machine without complex programming. These holders grip your deburring tools and extend and retract along the shape of your part to smooth away burs—no overcutting. All you need to do is tell your CNC machine which direction to go. Use them with ball burs.

To mount these tool holders to your machine, you will need another rotary tool holder or a collet that accepts a 20 mm diameter shank. They should not be held by hydraulic chucks or shrink-fit holders. To install your bur, you'll need an ER-11 collet. Use the spanner wrench (sold separately) to tighten the tool holder nut around the collet.

These tool holders should not be used with cutting fluid; clear any fluid or debris off your workpiece before deburring.

Fixed Spring Load—Tool holders with a fixed spring load apply a consistent amount of force. They apply force by pushing down (compression) when working on the front of your part and pulling back (tension) when working on the back of your part, so you can deburr both sides with a single holder.

Adjustable Spring Load—Tool holders with an adjustable spring load have four levels of deburring force. They only apply force by pushing down (compression) on your part, so they can only deburr the front.

Light Spring Load—A light spring load has a delicate cutting action, applying about the same amount of pressure as your pinky finger. It is ideal for aluminum, plastics, and other soft materials.

Medium Spring Load—A medium spring load is best for moderate cutting action, applying about as much pressure as your index finger. Use it when deburring steel.

Heavy Spring Load—A heavy spring load is best for aggressive cutting—it gives about the same force as pressing down with your palm. Use it on stainless steel and other hard materials.

	Holders																		Spanner Wrenches
	Spring Load			Shank				Bur				Nut, mm
	Force, N	Rating	Overall Lg., mm	For Collet Type	For Collet Size, mm	Dia., mm	Lg., mm	For Collet Type	For Collet Size	For Shape	For Max. Shank Dia.	Dia.	Lg.	Compression Lg., mm	Extension Lg., mm	Material		Each		Each
Fixed Spring Load—For Front and Back Side



		3	Light	130 to 150	ER-32, ER-40, ER-50, TG-100	20	20	40	ER-11	1/4"	Ball	1/4"	16	12	10	10	Steel	8238N11	0000000	8238N15	000000


		5	Medium	130 to 150	ER-32, ER-40, ER-50, TG-100	20	20	40	ER-11	1/4"	Ball	1/4"	16	12	10	10	Steel	8238N12	000000	8238N15	00000
		7	Heavy	130 to 150	ER-32, ER-40, ER-50, TG-100	20	20	40	ER-11	1/4"	Ball	1/4"	16	12	10	10	Steel	8238N13	000000	8238N15	00000


		Adjustable Spring Load—For Front Side



				2.5, 4, 6.5, 8	Light, Medium, Heavy	145 to 155	ER-32, ER-40, ER-50, TG-100	20	20	45	ER-11	1/4"	Ball	1/4"	16	12	10	—	Steel	8238N14	000000	8238N15	00000

ER Collets

The most widely used type of collet, these collets hold cutting tools in ER collet chucks for milling, drilling, and routing. Spring slots clamp evenly around the shank to minimize runout for clean, accurate cuts and long tool life. The slots flex to grip slightly undersized shanks too, so you don't need an exact match for each cutting tool in your lineup. You can also use these collets in ER collet fixtures and custom setups to keep small round parts centered.

	ID Tolerance	Max. Body Dia.	Overall Lg.	Specs. Met		Each
ER-40







	Hardened 52100 Alloy Steel

	1/8"	0.086" to 0.125"	0.0002"	-0.0004" to 0"	1.61"	1.81"	DIN 6499-B, ISO 15488 Form B	9498N11	000000


	5/32"	0.117" to 0.156"	0.0002"	-0.0004" to 0"	1.61"	1.81"	DIN 6499-B, ISO 15488 Form B	9498N12	00000
	3/16"	0.148" to 0.187"	0.0002"	-0.0004" to 0"	1.61"	1.81"	DIN 6499-B, ISO 15488 Form B	9498N13	00000
	7/32"	0.179" to 0.218"	0.0002"	-0.0004" to 0"	1.61"	1.81"	DIN 6499-B, ISO 15488 Form B	9498N14	00000
	1/4"	0.211" to 0.250"	0.0002"	-0.0004" to 0"	1.61"	1.81"	DIN 6499-B, ISO 15488 Form B	9498N15	00000
	9/32"	0.242" to 0.281"	0.0002"	-0.0004" to 0"	1.61"	1.81"	DIN 6499-B, ISO 15488 Form B	9498N16	00000
	5/16"	0.273" to 0.312"	0.0002"	-0.0004" to 0"	1.61"	1.81"	DIN 6499-B, ISO 15488 Form B	9498N17	00000
	11/32"	0.304" to 0.343"	0.0002"	-0.0004" to 0"	1.61"	1.81"	DIN 6499-B, ISO 15488 Form B	9498N18	00000
	3/8"	0.336" to 0.375"	0.0002"	-0.0004" to 0"	1.61"	1.81"	DIN 6499-B, ISO 15488 Form B	9498N19	00000
	7/16"	0.398" to 0.437"	0.0002"	-0.0004" to 0"	1.61"	1.81"	DIN 6499-B, ISO 15488 Form B	9498N21	00000
	1/2"	0.461" to 0.500"	0.0002"	-0.0004" to 0"	1.61"	1.81"	DIN 6499-B, ISO 15488 Form B	9498N22	00000


	17/32"	0.492" to 0.531"	0.0002"	-0.0004" to 0"	1.61"	1.81"	DIN 6499-B, ISO 15488 Form B	9498N23	00000
	9/16"	0.523" to 0.562"	0.0002"	-0.0004" to 0"	1.61"	1.81"	DIN 6499-B, ISO 15488 Form B	9498N24	00000
	5/8"	0.586" to 0.625"	0.0002"	-0.0004" to 0"	1.61"	1.81"	DIN 6499-B, ISO 15488 Form B	9498N25	00000
	21/32"	0.617" to 0.656"	0.0002"	-0.0004" to 0"	1.61"	1.81"	DIN 6499-B, ISO 15488 Form B	9498N26	00000
	3/4"	0.711" to 0.750"	0.0002"	-0.0004" to 0"	1.61"	1.81"	DIN 6499-B, ISO 15488 Form B	9498N27	00000
	25/32"	0.742" to 0.781"	0.0002"	-0.0004" to 0"	1.61"	1.81"	DIN 6499-B, ISO 15488 Form B	9498N28	00000
	7/8"	0.836" to 0.875"	0.0002"	-0.0004" to 0"	1.61"	1.81"	DIN 6499-B, ISO 15488 Form B	9498N29	00000
	1"	0.961" to 1"	0.0002"	-0.0004" to 0"	1.61"	1.81"	DIN 6499-B, ISO 15488 Form B	9498N31	00000
	3 mm	2 mm to 3 mm	0.0002"	-0.0004" to 0"	1.61"	1.81"	DIN 6499-B, ISO 15488 Form B	9498N32	00000
	4 mm	3 mm to 4 mm	0.0002"	-0.0004" to 0"	1.61"	1.81"	DIN 6499-B, ISO 15488 Form B	9498N33	00000


	5 mm	4 mm to 5 mm	0.0002"	-0.0004" to 0"	1.61"	1.81"	DIN 6499-B, ISO 15488 Form B	9498N34	00000
	8 mm	7 mm to 8 mm	0.0002"	-0.0004" to 0"	1.61"	1.81"	DIN 6499-B, ISO 15488 Form B	9498N35	00000
	10 mm	9 mm to 10 mm	0.0002"	-0.0004" to 0"	1.61"	1.81"	DIN 6499-B, ISO 15488 Form B	9498N36	00000
	12 mm	11 mm to 12 mm	0.0002"	-0.0004" to 0"	1.61"	1.81"	DIN 6499-B, ISO 15488 Form B	9498N37	00000
	20 mm	19 mm to 20 mm	0.0002"	-0.0004" to 0"	1.61"	1.81"	DIN 6499-B, ISO 15488 Form B	9498N38	00000
	25 mm	24 mm to 25 mm	0.0002"	-0.0004" to 0"	1.61"	1.81"	DIN 6499-B, ISO 15488 Form B	9498N39	00000