4-½" Mounting Cup W/ 3/8-16 X 5/8" Threaded Stud - Pack of 4

Wood's Powr-Grip LJ45AM — 4-1/2" UV-Resistant Vacuum Mounting Cup with 3/8-16 x 5/8" Threaded Stud for Flat and Curved Surfaces — Pack of 4

The Wood's Powr-Grip LJ45AM is a 4-1/2" vacuum mounting cup with a 3/8-16 x 5/8" threaded stud, providing a reliable, temporary mounting point for heavy equipment on smooth, nonporous surfaces without drilling holes or permanently modifying the surface. Featuring a 4-1/2" (11 cm) UV-resistant LJ45 rubber suction pad, rated for both flat and curved surfaces, and operable down to 0°F (-18°C). Load capacity is application-dependent — see the WPG Mounting Cup Capacity Calculator. Other stud lengths and thread configurations are available. Sold as a Pack of 4 with pad protectors. The LJ45AM (SKU: 91225, Model: LJ45AM) is manufactured by Wood's Powr-Grip.

The LJ45AM uses the 3/8-16 thread — a heavier equipment mounting thread used on professional video equipment, larger instrument brackets, heavy camera accessories, and industrial mounting hardware. This distinguishes the LJ45AM from the TL3AMB (1/4-20 thread, standard equipment/camera thread) and makes it the correct choice when the equipment being mounted uses 3/8-16 threaded mounting hardware. The 4-1/2" UV-resistant LJ45 pad provides outdoor UV resistance in addition to the standard flat+curved surface capability.

Key Features & Benefits

3/8-16 x 5/8" Threaded Stud — Heavy Equipment Mounting Thread

The 3/8-16 thread is a heavier mounting thread used on professional video equipment, cinema cameras, larger instrument brackets, heavy camera accessories, and industrial mounting hardware — applications where the lighter 1/4-20 thread is insufficient for the equipment weight or mounting hardware specification. The 5/8" stud length provides standard clearance for direct equipment attachment. Other stud lengths and thread configurations are available — contact us for non-standard configurations.

4-1/2" UV-Resistant LJ45 Pad — Outdoor and UV-Exposed Environments

The LJ45AM uses a 4-1/2" (11 cm) UV-resistant rubber pad — the same UV-resistant compound used on the TL3PH1304 camera mounting cup and TL3AMB mounting cup — providing extended service life in outdoor and UV-exposed environments where standard rubber pads would degrade from sunlight exposure. This makes the LJ45AM suitable for outdoor equipment mounting applications on vehicle glass, exterior architectural surfaces, and outdoor production environments.

No-Drill Equipment Mounting — No Surface Damage — Repositionable

The LJ45AM eliminates the need for drilling holes when mounting equipment on smooth nonporous surfaces. The vacuum cup base attaches without permanent modification, leaving no marks or damage when removed, and can be repositioned as needed.

Flat and Curved Surfaces — 0°F Rating — Pack of 4 with Pad Protectors

Rated for both flat and curved smooth, nonporous surfaces. Red-line indicator warns of any significant vacuum loss. Rated for operation down to 0°F (-18°C). Sold as a Pack of 4 with pad protectors.

Common Applications

Professional Video and Cinema Equipment Mounting

Film and video production crews use the LJ45AM to mount professional video cameras, cinema cameras, and heavy camera accessories that use 3/8-16 threaded mounting hardware on smooth nonporous surfaces without drilling. The UV-resistant pad handles outdoor sun exposure during extended shoots.

Heavy Instrument and Equipment Mounting

Engineers and technicians use the LJ45AM to mount heavy instruments, sensors, and equipment with 3/8-16 threaded mounting hardware on smooth nonporous surfaces for temporary measurement, inspection, and monitoring setups.

Outdoor Equipment Mounting on UV-Exposed Surfaces

The UV-resistant LJ45 pad makes the LJ45AM suitable for outdoor equipment mounting applications — including vehicle glass, exterior architectural glass, and outdoor smooth nonporous surfaces — where standard rubber pads would degrade from UV exposure.

No-Drill Mounting on Protected Surfaces

In environments where drilling is not permitted — including leased vehicles, finished architectural surfaces, and historic buildings — the LJ45AM provides a temporary mounting solution for 3/8-16 threaded equipment without permanent modification.

Compatible Surfaces

• Flat and curved plate glass and float glass
• Tempered and laminated safety glass (flat and curved)
• Vehicle glass and automotive surfaces (flat and curved)
• Polished stone and smooth metal panels (flat and curved)
• Exterior architectural glass and outdoor smooth nonporous surfaces
• Any smooth, nonporous flat or curved surface suitable for vacuum attachment

Not compatible with: rough, textured, or porous surfaces; surfaces contaminated with oil, wax, or debris; applications requiring permanent load-bearing attachment.

Product Documents

• LJ45AM Instructions (PDF)
• LJ45AM Troubleshooting Guide (PDF)

Technical Specifications

Frequently Asked Questions

Q: What is the difference between the LJ45AM (3/8-16 stud) and the TL3AMB (1/4-20 stud)?
A: Both are threaded stud mounting cups for equipment attachment without drilling. The LJ45AM uses a 3/8-16 thread — a heavier mounting thread for professional video equipment, cinema cameras, and heavy accessories. The TL3AMB uses a 1/4-20 thread — the standard equipment and camera tripod thread for lighter equipment and instruments. Choose the LJ45AM when your equipment uses 3/8-16 threaded mounting hardware; choose the TL3AMB for 1/4-20 threaded equipment. Also note: LJ45AM uses a 4-1/2" UV-resistant LJ45 pad; TL3AMB uses a 3" UV-resistant TL3 pad.

Q: Are other stud lengths and thread configurations available?
A: Yes. Other stud lengths and thread configurations are available beyond the standard 3/8-16 x 5/8" configuration. Contact us for non-standard configurations.

Q: How do I determine the load capacity for my application?
A: Load capacity for mounting cups varies by application, surface conditions, and orientation. Use the Wood's Powr-Grip Mounting Cup Capacity Calculator to determine the safe working load for your specific setup.

Q: Is this product made to order?
A: Yes. This product is made to order and all sales are final. Please confirm your surface type, stud thread requirement, and application before placing your order.