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.
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
Assembly Instructions
ER collet-lock nut assembly instructions
Inserting Collet (see fig. 1)
Always insert the collet into the lock nut before mounting onto the tool holder.
Insert groove of the collet into the eccentric extractor ring of the lock nut.
Push collet in the direction of the arrow.
Insert tool. Screw lock nut with collet onto the tool holder.
Improper collet insertion can permanently destroy the concentricity of the collet and may result in damaged lock nut.
Removing Collet (see fig. 2)
Press on the face of the collet while simultaneously pushing sideways on the back of the collet until it disengages from the lock nut.
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Scoll Down For Product Description
Short ER Collet Holders (Inch)
$71.00 – $151.00
Product Images
