Translating Optical Post Holders

The unique feature of the VPT Series Optical Post Holders is the ability to make fine, non-rotating vertical adjustments of components mounted with 0.5 in. (12.7 mm) optical posts such as the SP Series. Coarse vertical adjustments with minimal rotation can first be made by adjusting the post in a "no-slip" operational manner before locking the position with a spring-loaded thumbscrew. Fine adjustments can then be made by rotating a hand-turned collar that changes the height of the post holder, thereby changing the height of the component without rotating it. Available with or without a pedestal base.

Collar-turned non-rotating height adjustment
Spring-loaded clamping screw for no-slip operation
Compatible with 0.5 in. optical posts
Standard or pedestal base versions

See All Features

Description	Compatibility	Type	Height	Thread Type	Price
VPT-2-POptical Post Holder, Translating, Pedestal Base, 2.13-2.46 in., 0.5 in. Posts	UNIVERSAL	Pedestal Base Post Holder	54.1-62.5 mm	Pedestal base	$97
VPT-3-POptical Post Holder, Translating, Pedestal Base, 3.13-3.46 in., 0.5 in. Posts	UNIVERSAL	Pedestal Base Post Holder	79.5-87.9 mm	Pedestal base	$99
VPT-4-POptical Post Holder, Translating, Pedestal Base, 4.13-4.46 in., 0.5 in. Posts	UNIVERSAL	Pedestal Base Post Holder	104.9-113.3 mm	Pedestal base	$101
VPT-2Optical Post Holder, Translating, 2 - 2.28 in., 0.5 in. Posts, 1/4-20	IMPERIAL	Optical Post Holder	50.8-57.9 mm	1/4-20	$84
VPT-3Optical Post Holder, Translating, 3 - 3.64 in., 0.5 in. Posts, 1/4-20	IMPERIAL	Optical Post Holder	76.2-92.5 mm	1/4-20	$90
VPT-4Optical Post Holder, Translating, 4 - 4.64 in., 0.5 in. Posts, 1/4-20	IMPERIAL	Optical Post Holder	101.6-117.9 mm	1/4-20	$94
M-VPT-2Optical Post Holder, Translating, 50.8-57.9 mm, 12.7 mm Posts, M6	METRIC	Optical Post Holder	50.8-57.9 mm	M6	$84
M-VPT-3Optical Post Holder, Translating, 76.2-92.5 mm, 12.7 mm Posts, M6	METRIC	Optical Post Holder	76.2-92.5 mm	M6	$90
M-VPT-4Optical Post Holder, Translating, 101.6-117.9 mm, 12.7 mm Posts, M6	METRIC	Optical Post Holder	101.6-117.9 mm	M6	$94

Features

Non-Rotating Height Adjustment by Knurled Collar

Fine height adjustments of VPT Series Translating Optical Post Holders are easily made using a knurled collar which does not add additional girth to the post holder. When adjusting the height in this manner, the post does not rotate, and therefore the mount's orientation is maintained. The post holder translates 1/32 in. (0.8 mm) per revolution of the collar.

Model	Height Range
VPT-2	50.8–57.9 mm
VPT-3	76.2–92.5 mm
VPT-4	101.6–117.9 mm
VPT-2-P	50.8–57.9 mm
VPT-3-P	76.2–92.5 mm
VPT-4-P	101.6–117.9 mm

Two-Line Contact for Greater Stability

By using precision machining techniques to remove a small portion of the interior surface opposite the set screw of our VPT Series Translating Optical Post Holders, two lines of contact are created with a post when it is pushed in by the screw. These two lines of contact provide greater stability compared to a post held in place against another circular surface.

Versatile Mounting

Standard VPT post holders feature a 1/4-20 (M6) threaded hole at the bottom and therefore can be threaded directly into an optical table, or with a pedestal base adapter or slotted base (aluminum slotted base or stainless steel slotted base), be mounted anywhere on the optical table.

Pedestal Base Version Available

VPT post holders are also available in pedestal base version - a stainless steel pedestal base adapter already attached (model number ending with -P designation) for mounting to optical tables with a fork clamp.

Accessories

Pedestal Base Adapter and Clamping Fork

For complete list, check Pedestal Base Adapter and Clamping Fork families

Description	Compatibility	Price
PS-APedestal Base Adaptor, 0.19 in. Height, 1.25 in. Diameter, 1/4-20	IMPERIAL	$13.10
M-PS-APedestal Base Adaptor, 4.8 mm Height, 31.8 mm Diameter, M6 Thread	METRIC	$13.10
PS-AZPedestal Base Adaptor, Magnetic, 0.188 in. Height, 1.25 in. Diameter, 1/4-20	IMPERIAL	$23
M-PS-AZPedestal Base Adaptor, Magnetic, 4.8 mm Height, 31.8 mm Diameter, M6	METRIC	$23
PS-C-SETPedestal Clip Set, Two Clips, Two 1/4-20 Screws	UNIVERSAL	$18.70

Slotted Mounting Base

For complete list, check Aluminum Slotted Base Plates and Stainless Steel Slotted Base Plates families

Description	Compatibility	Price
B-05ASlotted Base, 0.68 in. Range Single Slot, Stainless Steel	UNIVERSAL	$10.70
B-1ADouble Slotted Base, 0.68 in. Range, Stainless Steel	UNIVERSAL	$11.40
B-2SADouble-Slotted Base, Stainless Steel, XY, 1.0 in. Range	UNIVERSAL	$14.40
9912Baseplate, 1.0 in. Width, 1/4-20 (M6) Counterbored	UNIVERSAL	$17.40
9914Baseplate, 2.0 in. Width, 1/4-20 (M6) Counterbored	UNIVERSAL	$24
BUP-2Universal Base, Freely Rotating Disk, Eccentric Clearance Slot	UNIVERSAL	$122