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.
![](/prerenderstable/mvPRE/contents/gfx/imagecache/207/20725a67p1-a01b-digital@halfx_637009626958912070.png?ver=imagenotfound)
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 |
Rigid-Arm Magnetic-Base Indicator Holders
![](/prerenderstable/mvPRE/contents/gfx/imagecache/231/2310a1p1-a01b-digital@halfx_637009623286055462.png?ver=imagenotfound)
![](/prerenderstable/mvPRE/contents/gfx/imagecache/231/2310a16p1-a01b-digital@halfx_637009635423501781.png?ver=imagenotfound)
Magnetic-Release Switch
and Fine-Adjustment Arm
![](/prerenderstable/mvPRE/contents/gfx/imagecache/231/2310a104-rev@halfx_ikm0p_1718373822.png?ver=imagenotfound)
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.
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 | 5 7/8" | 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 | 10 5/16" | 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 Rigid-Arm Magnetic-Base Indicator Holders
![](/prerenderstable/mvPRE/contents/gfx/imagecache/195/1958a31p1-a01b-digital@halfx_637009608255131049.png?ver=imagenotfound)
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 |
Economy Jointed-Arm Magnetic-Base Indicator Holders
![](/prerenderstable/mvPRE/contents/gfx/imagecache/221/2214a11-f@halfx_1fsep_1718126098.png?ver=imagenotfound)
![](/prerenderstable/mvPRE/contents/gfx/imagecache/221/2214a5p1-a01b-digital@halfx_637009626868100290.png?ver=imagenotfound)
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 3/16" | __ | __ | 1" | M6 | 1 | Cast Iron | 33 | 3 1/4" | 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
![](/prerenderstable/mvPRE/contents/gfx/imagecache/851/85195a63p1-a01b-digital@halfx_637009641638349299.png?ver=imagenotfound)
![](/prerenderstable/mvPRE/contents/gfx/imagecache/851/85195a28-@halfx_637226235873090731.png?ver=imagenotfound)
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
![](/prerenderstable/mvPRE/contents/gfx/imagecache/866/8667a31p1-a01b-digital@halfx_637009629540785689.png?ver=imagenotfound)
![](/prerenderstable/mvPRE/contents/gfx/imagecache/207/20755a23p3-a01b-digital@halfx_637009641507956666.png?ver=imagenotfound)
and Fine-Adjustment
Clamp
![](/prerenderstable/mvPRE/contents/gfx/imagecache/207/20755a65p2-a01b-digital@halfx_637009639571589973.png?ver=imagenotfound)
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 |
Low-Profile Magnetic-Base Indicator Holders with Multiple Mounting Locations
![](/prerenderstable/mvPRE/contents/gfx/imagecache/231/23105a65p2-a01b-digital@halfx_637884628375677711.png?ver=imagenotfound)
![](/prerenderstable/mvPRE/contents/gfx/imagecache/231/23105a65p1-a01b-digital@halfx_637009642295787551.png?ver=imagenotfound)
For more versatility than other low-profile holders, this holder has six locations for mounting indicators and accessories, including two mounting holes and four places to mount an indicator lug back with the included thumb screws. Use it in areas with limited space. The magnetic base has a V-grooved bottom for mounting on curved and flat metal surfaces.
For technical drawings and 3-D models, click on a part number.
For Stem Dia. Mounting Hole | Base | |||||||
---|---|---|---|---|---|---|---|---|
Unthreaded Round | Unthreaded V-Shape | Type | Ht. | Material | Magnetic Pull, lbs. | Mount Type | Each | |
3/8" | 1/8"-5/16" | Flat | 1 1/16" | Zinc | 45 | Stem | 00000000 | 000000 |
Flexible-Arm Magnetic-Base Indicator Holders for Uneven Surfaces
![](/prerenderstable/mvPRE/contents/gfx/imagecache/195/1951a85p1-upa01-@halfx_637606567558341239.png?ver=imagenotfound)
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 |
Rigid-Arm Magnetic-Base Indicator Holders for Uneven Surfaces
![](/prerenderstable/mvPRE/contents/gfx/imagecache/195/1951a84p1-upa01-@halfx_637606566915428769.png?ver=imagenotfound)
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 |
Jointed-Arm Vacuum-Base Indicator Holders
![](/prerenderstable/mvPRE/contents/gfx/imagecache/243/2433n11p1-a01b-digital@halfx_637009635892677616.png?ver=imagenotfound)
Position the arm by adjusting joints at the top, middle, and bottom. A vacuum base provides stability on granite plates and other nonmagnetic surfaces. Use the fine-adjustment knob on the clamp for precise positioning
For technical drawings and 3-D models, click on a part number.
Base | Arm | |||||||||
---|---|---|---|---|---|---|---|---|---|---|
For Mounting Stem Dia. | Dia. | Ht. | Thread Size | Thread Pitch, mm | Material | Lg. | Dia. | Features | Each | |
Dovetail and Stem Mount | ||||||||||
6mm, 8mm, 3/8" | 3 7/16" | 13/16" | M8 | 1.25 | Cast Aluminum | 11 1/8" | 0.705" | Fine-Adjustment Clamp | 0000000 | 0000000 |
Flexible-Arm Vacuum-Base Indicator Holders
![](/prerenderstable/mvPRE/contents/gfx/imagecache/234/2349n11p1-a01b-digital@halfx_637009638566523745.png?ver=imagenotfound)
Position the flexible ball-and-socket segmented arm around obstructions and lock in place with a lever. The vacuum base provides stability on granite plates and other nonmagnetic surfaces.
Base | Arm | ||||||||
---|---|---|---|---|---|---|---|---|---|
For Mounting Stem Dia. | Dia. | Ht. | Thread Size | Thread Pitch, mm | Material | Lg. | Dia. | Each | |
Stem Mount | |||||||||
1/8"-1/2" | 3.465" | 1.063" | M8 | 1.25 | Aluminum | 13" | 0.625" | 0000000 | 0000000 |
Economy Flexible-Arm Weighted-Base Indicator Holders
![](/prerenderstable/mvPRE/contents/gfx/imagecache/262/2626n12-@halfx_9l95z_1716579084.png?ver=imagenotfound)
![](/prerenderstable/mvPRE/contents/gfx/imagecache/262/2626n11p1-a01b-digital@halfx_637009641291075228.png?ver=imagenotfound)
Adjust the flexible ball-and-socket segmented arm to nearly any position and lock in place. A heavy base adds stability.
Holders with a granite base have an extremely tight flatness tolerance. Their flatness gives you an accurate reference for inspection work and lets you move workpieces in and out smoothly. These holders have a fine-adjustment clamp to position indicators at precise angles.
Base | Upright Post | Arm | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
For Mounting Stem Dia. | Dia. | Lg. | Wd. | Ht. | Thread Size | Material | Dia. | Ht. | Lg. | Dia. | Features | Each | |
Dovetail and Stem Mount | |||||||||||||
5/8" | __ | 9" | 12" | 2" | 5/16''-24 | Granite | 5/8" | 12" | 12" | 0.625" | Fine-Adjustment Clamp | 0000000 | 0000000 |
5/8" | __ | 12" | 18" | 3" | 5/16''-24 | Granite | 5/8" | 12" | 15" | 0.625" | Fine-Adjustment Clamp | 0000000 | 000000 |
Stem Mount | |||||||||||||
1/8"-1/2" | 6" | __ | __ | 15/16" | 5/16''-18 | Cast Iron | __ | __ | 13" | 0.625" | __ | 0000000 | 000000 |
Economy Jointed-Arm Weighted-Base Indicator Holders
![](/prerenderstable/mvPRE/contents/gfx/imagecache/554/5545n11-f6@halfx_82p0a_1717535380.png?ver=imagenotfound)
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 |
Workpiece-Centering Indicator Holders
![](/prerenderstable/mvPRE/contents/gfx/imagecache/237/2371n11p1-a01b-digital@halfx_637009618852695602.png?ver=imagenotfound)
Mount this holder into your machine spindle and use for centering workpieces. The clamp has a fine-adjustment knob for precise positioning.
For technical drawings and 3-D models, click on a part number.
Arm | Shank | |||||||
---|---|---|---|---|---|---|---|---|
For Mounting Stem Dia. | Lg. | Dia. | Lg. | Dia. | Material | Features | Each | |
Dovetail and Stem Mount | ||||||||
6mm, 8mm, 3/8" | 7 " | 3/8 " | 1 9/16" | 5/16" | Steel | Fine-Adjustment Clamp | 0000000 | 000000 |
Flexible-Arm Clamp-On Indicator Holders
![](/prerenderstable/mvPRE/contents/gfx/imagecache/231/23165a75-@halfx_43vbr_1719333982.png?ver=imagenotfound)
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.
Clamp-On Indicator Holders
![](/prerenderstable/mvPRE/contents/gfx/imagecache/209/20945a65p1-upa01-@halfx_637608145401148943.png?ver=imagenotfound)
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
![](/prerenderstable/mvPRE/contents/gfx/imagecache/209/20945a65p1-upa01-@halfx_637608145401148943.png?ver=imagenotfound)
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.