Fine Adjustment Attachments for Starrett Magnetic-Base Indicator Holders
Install this attachment onto Starrett magnetic-base holders for more precise control over positioning.
| For Arm Dia. | Material | Manufacturer Model Number | Each | |
| 0.5" | Steel | 657W | 00000000 | 000000 |
Starrett Rigid-Arm Magnetic-Base Indicator Holders
The magnetic base has a flat bottom for mounting on flat metal surfaces and a magnetic release switch for easy setups.
Fine-adjustment attachment (sold separately) can be installed between the upright post and the base to give you more precise control over positioning.
Base | Upright Post | Arm | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| For Mounting Lug Hole Dia. | For Mounting Stem Dia. | Lg. | Wd. | Ht. | Thread Size  | Material | Magnetic Pull, lbs. | Dia. | Ht. | Lg. | Dia. | Features | Manufacturer Model Number | Each | |
Lug and Stem Mount | |||||||||||||||
| 1/4" | 1/4" | 1 57/64" | 1 5/8" | 1 29/32" | 1/4"-20 | Steel | 75 | 3/8" | 7 5/16" | 6" | 0.25" | Magnetic-Release Switch | 657AA | 00000000 | 0000000 |
| Fine Adjustment Attachment | 00000000 | Each | 000000 |
Economy Rigid-Arm Magnetic-Base Indicator Holders
The magnetic base has a V-grooved bottom for mounting on flat and curved metal surfaces and a magnetic release switch for easy setups. Use the fine-adjustment knob for precise positioning of the arm.
Base | Upright Post | Arm | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| For Mounting Lug Hole Dia. | For Mounting Stem Dia. | Lg. | Wd. | Ht. | Thread Size | Thread Pitch, mm | Material | Magnetic Pull, lbs. | Dia. | Ht. | Material | Lg. | Dia. | Features | Each | |
Lug and Stem Mount | ||||||||||||||||
| 1/4" | 3/8" | 2 5/8" | 2" | 2 15/16" | M8 | 1.25 | Cast Iron | 132 | 7/16" | 6.9" | Steel | 5 13/16" | 0.464" | Fine-Adjustment Arm, Magnetic-Release Switch | 0000000 | 000000 |
Rigid-Arm Magnetic-Base Indicator Holders
Magnetic-Release Switch
and Fine-Adjustment Arm
Securely mount indicators to metal surfaces with the magnetic base on these holders. They have a switch that releases the magnet for easy setups.
Holders with a fine-adjustment arm have a knob on the arm that lets you precisely adjust the arm’s angle or move the indicator up and down.
Holders with two arms have an extra long reach. Bend them where the two arms meet to change the direction of your indicator. You can also remove an arm if you’re using these holders in a tight space.
Holders with a V-grooved base can be mounted on flat or curved metal surfaces.
For technical drawings and 3-D models, click on a part number.
Base | Upright Post | Arm | |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| No. of Arms | For Mounting Lug Hole Dia. | For Mounting Stem Dia. | Type | Lg. | Wd. | Ht. | Thread Size | Thread Pitch, mm | Material | Magnetic Pull, lbs. | Dia. | Ht. | Material | Lg. | Dia. | Each | |
Dovetail and Stem Mount | |||||||||||||||||
Magnetic-Release Switch | |||||||||||||||||
| 1 | __ | 3/8" | V-Grooved | 2.362" | 1.97" | 2.165" | M8 | 1.25 | Cast Iron | 176 | 1/2" | 6 7/8" | Steel | 6 5/16" | 0.393" | 00000000 | 000000 |
Fine-Adjustment Arm, Magnetic-Release Switch | |||||||||||||||||
| 1 | __ | 3/8" | V-Grooved | 2.362" | 1.97" | 2.165" | M8 | 1.25 | Cast Iron | 176 | 1/2" | 6 7/8" | Steel | 6" | 0.393" | 00000000 | 00000 |
Lug and Stem Mount | |||||||||||||||||
Magnetic-Release Switch | |||||||||||||||||
| 1 | 1/4" | 5/32"-1/4" | V-Grooved | 2.559" | 1.97" | 2.165" | M8 | 1.25 | Cast Iron | 176 | 7/16" | 6 7/8" | Steel | 6 1/2" | 0.375" | 000000 | 00000 |
Fine-Adjustment Arm, Magnetic-Release Switch | |||||||||||||||||
| 1 | 1/4" | 5/32"-1/4" | V-Grooved | 2.559" | 1.97" | 2.165" | M8 | 1.25 | Cast Iron | 176 | 7/16" | 6 7/8" | Steel | 6 1/2" | 0.375" | 0000000 | 00000 |
| 1 | 1/4" | 5/32"-1/4" | V-Grooved | 2.874" | 1.97" | 2.165" | M10 | 1.5 | Cast Iron | 220 | 13/16" | 14" | Steel | 8 11/16" | 0.472" | 00000000 | 000000 |
| 1 | 1/4" | 1/4"-5/16" | V-Grooved | 2.953" | 1.97" | 2.165" | M8 | 1.25 | Cast Iron | 220 | 5/8" | 8 7/8" | Steel | 6 1/2" | 0.563" | 0000000 | 00000 |
| 2 | 1/4" | 3/4" | Flat | 2.375" | 2" | 4.687" | M8 | 1.25 | Cast Iron | 180 | 3/4" | 12" | Steel | 15" | 0.5" | 00000000 | 000000 |
Economy Jointed-Arm Magnetic-Base Indicator Holders
Position the arm by adjusting joints at the top and middle. Use the fine adjustment knob for precise positioning.
Holders with a V-grooved base can be mounted on both curved and flat metal surfaces. They have an additional joint at the bottom.
Base | Arm | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| For Mounting Stem Dia. | Type | Dia. | Lg. | Wd. | Ht. | Thread Size | Thread Pitch, mm | Material | Magnetic Pull, lbs. | Lg. | Dia. | Features | Each | |
Stem Mount | ||||||||||||||
| 1/8"-1/4" | Flat | 1 3/8" | __ | __ | 1 1/8" | M6 | 1 | Steel | 33 | 3 3/8" | 0.236" | Fine-Adjustment Arm, Fine-Adjustment Base | 0000000 | 000000 |
Dovetail and Stem Mount | ||||||||||||||
| 3/8" | V-Grooved | __ | 2 1/2" | 2" | 2 3/16" | M8 | 1.25 | Cast Iron | 132 | 13 1/2" | 0.464" | Fine-Adjustment Clamp, Magnetic-Release Switch | 000000 | 00000 |
Jointed-Arm Magnetic-Base Indicator Holders
Position the arm by adjusting joints at the top, middle, and bottom. The magnetic base has a V-grooved bottom for mounting on curved and flat metal surfaces and a magnetic-release switch for easy setups. Holders have fine-adjustment knobs for precise positioning.
Indicator Holders | |||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Base | Arm | Replacement Arms | Replacement Clamps | ||||||||||||||
| For Mounting Stem Dia. | Lg. | Wd. | Ht. | Thread Size | Thread Pitch, mm | Material | Magnetic Pull, lbs. | Lg. | Dia. | Features | Includes | Each | Each | Each | |||
Dovetail and Stem Mount | |||||||||||||||||
| 6mm, 8mm, 3/8" | 1 1/2" | 1 1/4" | 1 3/8" | M5 | 0.8 | Cast Iron | 70 | 4 1/4" | 3/8" | Fine-Adjustment Base, Fine-Adjustment Clamp, Magnetic-Release Switch | Swivel Clamp | 00000000 | 0000000 | 00000000 | 000000 | 00000000 | 000000 |
| 6mm, 8mm, 3/8" | 2 3/8" | 1 15/16" | 2 5/32" | M8 | 1.25 | Cast Iron | 176 | 11" | 1/2" | Fine-Adjustment Base, Fine-Adjustment Clamp, Magnetic-Release Switch | Swivel Clamp | 00000000 | 000000 | 00000000 | 00000 | 00000000 | 00000 |
| 6mm, 8mm, 3/8" | 4 3/4" | 1 15/16" | 2 5/32" | M10 | 1.25 | Cast Iron | 290 | 20" | 3/4" | Fine-Adjustment Clamp, Magnetic-Release Switch | Swivel Clamp | 00000000 | 000000 | 00000000 | 000000 | 00000000 | 00000 |
Flexible-Arm Magnetic-Base Indicator Holders
and Fine-Adjustment
Clamp
Adjust the flexible arm to nearly any position. These holders have a ball-and-socket segmented arm that locks in place with a lever. The magnetic base has a release switch for easy setups.
Holders with V-grooved base can be mounted on both curved and flat surfaces.
Holders with fine-adjustment base or clamp give you more precise control over positioning.
Indicator Holders | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Base | Arm | Replacement Arms | ||||||||||||
| For Mounting Stem Dia. | Type | Lg. | Wd. | Ht. | Thread Size | Thread Pitch, mm | Material | Magnetic Pull, lbs. | Lg. | Dia. | Each | Each | ||
Dovetail and Stem Mount | ||||||||||||||
Magnetic-Release Switch | ||||||||||||||
| 3/8" | V-Grooved | 2 1/2" | 2" | 2 1/8" | M8 | 1.25 | Steel | 125 | 12" | 0.625" | 00000000 | 000000 | 00000000 | 000000 |
Fine-Adjustment Clamp, Magnetic-Release Switch | ||||||||||||||
| 3/8" | V-Grooved | 2" | 2 1/2" | 2 5/8" | 5/16''-18 | __ | Steel | 90 | 15 1/4" | 0.625" | 00000000 | 000000 | 00000000 | 00000 |
Stem Mount | ||||||||||||||
Magnetic-Release Switch | ||||||||||||||
| 5/32"-1/2" | V-Grooved | 2 1/2" | 2" | 2 1/4" | M8 | 1.25 | Steel | 180 | 12 1/2" | 0.63" | 0000000 | 00000 | 0000000 | 00000 |
Fine-Adjustment Base, Magnetic-Release Switch | ||||||||||||||
| 1/8"-1/2" | Flat | 2" | 1 5/8" | 2" | __ | __ | Steel | 65 | 14" | 0.625" | 00000000 | 000000 | 00000000 | 000000 |
Rigid-Arm Magnetic-Base Indicator Holders for Uneven Surfaces
The base is comprised of adjustable magnetic pins which allow it to conform to any shape and grip most metal surfaces. Use the fine-adjustment knob to precisely position the arm.
Base | Upright Post | Arm | |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| For Mounting Lug Hole Dia. | For Mounting Stem Dia. | Lg. | Wd. | Ht. | Thread Size | Thread Pitch, mm | Material | Magnetic Pull, lbs. | Dia. | Ht. | Material | Lg. | Dia. | Material | Features | Each | |
Lug and Stem Mount | |||||||||||||||||
| 1/4" | 5/32"-3/8" | 1 15/16" | 1 5/8" | 2 7/8" | M8 | 1.25 | Cast Aluminum | 120 | 15/32" | 7 1/16" | Steel | 3 1/2" | 0.469" | Steel | Fine-Adjustment Arm, Magnetic-Release Switch | 0000000 | 0000000 |
Flexible-Arm Magnetic-Base Indicator Holders for Uneven Surfaces
A flexible ball-and-socket segmented arm adjusts to nearly any position and locks in place with a lever. The base is comprised of adjustable magnetic pins which allow it to conform to any shape and grip most metal surfaces. It has a magnetic-release switch for easy setups.
Base | Arm | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| For Mounting Stem Dia. | Lg. | Wd. | Ht. | Thread Size | Thread Pitch, mm | Material | Magnetic Pull, lbs. | Lg. | Dia. | Material | Features | Each | |
Stem Mount | |||||||||||||
| 5/64"-1/2" | 1 15/16" | 1 5/8" | 2 7/8" | M8 | 1.25 | Cast Aluminum | 120 | 12 1/2" | 0.47" | Steel | Magnetic-Release Switch | 0000000 | 0000000 |
Magnetic Bases
Set onto metal surfaces for a secure mount. Use the threaded mounting hole on these bases to hold upright posts and fixtures.
V-grooved bases can be mounted on both curved and flat metal surfaces.
Bases with a magnetic-release switch are easy to remove.
Base | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Lg. | Wd. | Dia. | Ht. | Thread Size | Thread Pitch, mm | Material | Magnetic Pull, lbs. | Mounting Hole Location | Features | Each | |
Flat | |||||||||||
| __ | __ | 1 3/16" | 15/16" | M5 | 0.8 | Cast Iron | 44 | Top | __ | 0000000 | 000000 |
| 1 3/16" | 1 3/16" | __ | 1 3/16" | M5 | 0.8 | Cast Iron | 38 | Top | Magnetic-Release Switch | 0000000 | 00000 |
| 1 5/8" | 1 7/8" | __ | 2" | M8 | 1.25 | Cast Iron | 65 | Top | Magnetic Release Switch | 0000000 | 00000 |
| 4 5/8" | 2 3/8" | __ | 2" | M8 | 1.25 | Cast Iron | 180 | Top | Magnetic Release Switch | 0000000 | 000000 |
| 4 3/4" | 2 3/8" | __ | 2 1/16" | M8 | 1.25 | Cast Iron | 337 | Top | Magnetic-Release Switch | 000000 | 000000 |
V-Grooved | |||||||||||
| 1 9/16" | 1 3/16" | __ | 1 3/8" | M5 | 0.8 | Cast Iron | 71 | Top | Magnetic Release Switch | 0000000 | 00000 |
| 2" | 2 1/4" | __ | 2 5/8" | M8 | 1.25 | Cast Iron | 90 | Top | Magnetic Release Switch | 0000000 | 00000 |
| 2 5/8" | 2" | __ | 2 3/16" | M8 | 1.25 | Cast Iron | 176 | Top | Magnetic-Release Switch | 000000 | 00000 |
| 3" | 2" | __ | 2 3/16" | M8 | 1.25 | Cast Iron | 220 | Top | Magnetic-Release Switch | 0000000 | 00000 |
| 4 5/8" | 2" | __ | 2 3/16" | M10 | 1.5 | Cast Iron | 292 | Top | Magnetic-Release Switch | 0000000 | 000000 |
Economy Magnetic Bases
This magnetic base has a threaded mounting hole to hold upright posts and fixtures. It has a V-grooved bottom for mounting on curved and flat metal surfaces and a magnetic-release switch for easy setups.
Starrett Magnetic Bases
The threaded mounting holes on this base hold upright posts and fixtures. It has a flat bottom for mounting on flat metal surfaces and a V-step at the top of the base for mounting on round surfaces. The magnetic-release switch allows for easy setups.
Magnetic Bases for Uneven Surfaces
The pins on these bases adjust to grip a variety of contours, such as sharp, rounded, and uneven surfaces. Switch off the magnetic pins to easily move or set up these bases. Use the threaded mounting hole to hold upright posts and fixtures.
Clamp-On Indicator Holders
Attach the C-clamp on these holders to your milling machine head to take indicator measurements without obstructing the cutting tool. Use the fine-adjustment rod to precisely position the arm.
Overall reach is the distance from the center of the C-clamp to the end of the arm when both are extended.
For technical drawings and 3-D models, click on a part number.
Clamp-On Indicator Holders for Bridgeport J Heads
Attach the C-clamp on this holder to your Bridgeport J head to take indicator measurements without obstructing the cutting tool. Use the fine-adjustment rod to precisely position the arm.
Overall reach is the distance from the center of the C-clamp to the end of the arm when both are extended.
For technical drawings and 3-D models, click on a part number.
Flexible-Arm Clamp-On Indicator Holders
Vise-grip locking pliers clamp this holder to most thin, flat surfaces, and the flexible arm lets you position your indicator around obstructions. Lock the arm in place with a lever.
Economy Jointed-Arm Weighted-Base Indicator Holders
Stabilize and precisely position your indicator with these weighted bases. Attached to the base, these holders have a jointed arm for moving your indicator up and down and in and out. Tighten the knob on the arm to lock it in place and use the fine-adjustment clamp for angling your indicator just right. Made of granite, the base has an extremely tight flatness tolerance, so it creates an accurate reference point for inspection work. It also means you can easily slide your workpiece in and out.
Base | Arm | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| For Mounting Stem Dia. | Lg. | Wd. | Ht. | Thread Size | Material | Lg. | Dia. | Granite Base Flatness Tolerance | Features | Each | |
Dovetail and Stem Mount | |||||||||||
| 8mm, 3/8" | 12" | 9" | 2" | 5/16''-18 | Granite | 12 1/2" | 0.495" | ±0.00015" | Fine-Adjustment Arm, Fine-Adjustment Clamp | 0000000 | 0000000 |
| 8mm, 3/8" | 18" | 12" | 3" | 5/16''-18 | Granite | 14" | 0.495" | ±0.00015" | Fine-Adjustment Arm, Fine-Adjustment Clamp | 0000000 | 000000 |
Vacuum Bases
Create a stable base for your indicator on granite plates and other nonmagnetic surfaces. These bases have a threaded mounting hole to hold upright posts (sold separately) and fixtures.
Dial-Indicator Shaft Alignment Chain Clamp Kits
Find misalignment across adjacent shafts—these clamps position a dial indicator on each shaft to locate offset or angular misalignment in both the horizontal and vertical axes.
Continuous dials are numbered clockwise around the face for direct measurement. Balanced dials are more versatile than continuous dials because they help detect misalignment in both directions. They have a center zero with positive values on one side and negative values on the other.
Back plungers take up less space in your set up because their plunger sits flush against the shaft. They mount in multiple orientations to fit in a variety of set ups. Bottom plungers are oriented best to detect vertical misalignment. They’re also mountable and allow you to see the shaft and dial indicator at the same time, giving you accurate readings.
Dial Indicator | ||||||||
|---|---|---|---|---|---|---|---|---|
| For Shaft Dia. | Dial Type | Plunger Location | Measuring Increments | Measuring Range | Container Type | Includes | Each | |
| 0"-9" | Continuous | Back | 0.001" | 0"-0.2" | Case | Inspection Mirror, Two Dial Indicators, Two Swivel Clamps | 0000000 | 000000000 |
| 0"-9" | Balanced | Back | 0.001" | 0"-0.2" | Case | Inspection Mirror, Two Dial Indicators, Two Swivel Clamps | 0000000 | 00000000 |
| 0"-9" | Balanced | Bottom | 0.001" | 0"-0.3" | Case | Inspection Mirror, Two Dial Indicators, Two Swivel Clamps | 0000000 | 00000000 |
Shaft Alignment Chain Clamp Kits
Kit includes two chain clamps, an inspection mirror, and a case. Pair this kit with your own test indicators to check for shaft misalignment.
| For Shaft Dia. | Container Type | Includes | Each | |
| 0"-9" | Case | Inspection Mirror, Two Chain Clamps | 0000000 | 0000000 |
Shaft Alignment Chain Clamps
Install a test indicator on each holding rod to check for shaft misalignment.
Body | Mounting | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| For Shaft Dia. | Chain Lg. | Lg. | Wd. | Body Material | Hole Location | Fasteners Included | No. of Holes | Hole Thread Size | Includes | Each | |
| 1"-6" | 24" | 3 5/8" | 3/4" | Stainless Steel | Side | Yes | 3 | 1/4"-28 | ANSI No. 41 Chain (6" Dia. Capacity) One 5/16" Dia. x 3-1/4" Lg. Stainless Steel Holding Rod One 5/16" Dia. x 6-1/2” Lg. Stainless Steel Holding Rod | 00000000 | 0000000 |
| 0"-9" | 24" | 3" | 3" | Aluminum | __ | __ | __ | __ | ANSI No. 41 Chain (9” Dia. Capacity) One 5/16” Dia. x 3” Lg. Stainless Steel Holding Rod One 5/16” Dia. x 6” Lg. Stainless Steel Holding Rod | 0000000 | 000000 |