Product Description

Part includes Lock Nut & Back-Up Screw (where applicable).

Straight Shank Collet Chucks
Short “Stubby” ER Collet Holders 3.5″ – 6.2″ OAL

Replacement Lock Nuts &
Open-end hex wrenches
are also available
(Part Numbers In Table Below)

For use on CNC Mills

Manufactured in USA from high grade, heat-treated alloy steel
Black Oxide finish for corrosion prevention
Comes equipped with inside back-up screw and Lock Nut
Tighten lock nut with a standard open-end wrench
(no special wrench needed, unlike other brands)
Smaller diameter lock nut than most brands make
these ideal for machining hard-to-reach surfaces.

ER lock nuts interchangeable with ER “mini” lock nuts of other manufacturers.

Rovi

Table Of Dimensions

Chuck Part Number	D Shank Diameter	L Overall Length	L1 Lock Nut Length	D1 Lock Nut Diameter	Hex. Wrench Size	Max. Dia. Thru Shank	ER Collet Series	Chuck Capacity	Wrench Part Number	Lock Nut Part Number
SPH-ER11-0500	0.500	3.50	0.47	0.62	9/16″	1/4″	ER11	.019 – .276	W-0562	LN-ER11
SPH-ER11-0625	0.625	3.50	0.47	0.62	9/16″	1/4″	ER11	.019 – .276	W-0562	LN-ER11
SPH-ER16-0625	0.625	3.65	0.68	0.86	13/16″	3/8″	ER16	.019 – .394	W-0812	LN-ER16
SPH-ER16-0750	0.750	3.65	0.68	0.86	13/16″	3/8″	ER16	.019 – .394	W-0812	LN-ER16
SPH-ER20-0625	0.625	3.75	0.78	1.10	1″	3/8″	ER20	.039 – .512	W-1000	LN-ER20
SPH-ER20-0750	0.750	3.75	0.78	1.10	1″	3/8″	ER20	.039 – .512	W-1000	LN-ER20
SPH-ER20-1000	1.000	3.75	0.78	1.10	1″	9/16″	ER20	.039 – .512	W-1000	LN-ER20
SPH-ER25-1000	1.000	6.10	0.84	1.36	1-1/4″	3/4″	ER25	.039 – .630	W-1250	LN-ER25
SPH-ER25-1250	1.250	6.10	0.84	1.36	1-1/4″	3/4″	ER25	.039 – .630	W-1250	LN-ER25
SPH-ER32-1000	1.000	6.20	0.95	1.61	1-1/2″	9/16″	ER32	.039 – .787	W-1500	LN-ER32
SPH-ER32-1250	1.250	6.20	0.95	1.61	1-1/2″	3/4″	ER32	.039 – .787	W-1500	LN-ER32
SPH-ER32-1500	1.500	6.20	0.95	1.61	1-1/2″	3/4″	ER32	.039 – .787	W-1500	LN-ER32

Images to the right (second image in Product Gallery below main image)
All back-up screws have 1/8″ hex. socket
DO NOT OVER TIGHTEN LOCK NUT, ALWAYS USE BACKUP SCREW