4-½" Mounting Cup W/ 3/8-16 X 1/4" Threaded Stud - Pack of 4

Wood's Powr-Grip LJ45AM — 4-1/2" UV-Resistant Vacuum Mounting Cup with 3/8-16 x 1/4" 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 1/4" 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: 91227) is manufactured by Wood's Powr-Grip.

This is the short-stud (1/4" length) variant of the LJ45AM 3/8-16 mounting cup. The 1/4" stud length provides a lower-profile mounting configuration compared to the 5/8" stud variant (SKU: 91225) — suited for applications where minimal clearance is available between the cup body and the equipment mounting surface, or where a shorter stud projection is required by the equipment bracket or mounting hardware. Both variants use the same 3/8-16 thread, 4-1/2" UV-resistant LJ45 pad, and all other specifications. Select the stud length that matches your equipment’s clearance and mounting hardware requirements. Other stud lengths and thread configurations are available.

Key Features & Benefits

3/8-16 x 1/4" Threaded Stud — Short-Stud Low-Profile Configuration

The 3/8-16 thread is a heavier equipment mounting thread used on professional video equipment, cinema cameras, larger instrument brackets, heavy camera accessories, and industrial mounting hardware. The 1/4" stud length is the shorter configuration in the LJ45AM 3/8-16 lineup, providing a low-profile mounting point for applications where minimal clearance is available between the cup body and the equipment, or where the equipment bracket requires a shorter stud projection. For applications requiring more clearance, the 5/8" stud variant (SKU: 91225) is available. Other stud lengths and thread configurations are also 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, providing extended service life in outdoor and UV-exposed environments where standard rubber pads would degrade from sunlight exposure. Suitable for outdoor equipment mounting applications on vehicle glass, exterior architectural surfaces, and outdoor production environments.

No-Drill Equipment Mounting — No Surface Damage — Repositionable

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.

LJ45AM 3/8-16 Stud Length Variants

Other stud lengths and thread configurations are available — contact us for non-standard configurations.

Common Applications

Low-Profile Professional Video and Cinema Equipment Mounting

Film and video production crews use the short-stud LJ45AM where the equipment bracket or mounting hardware requires a 3/8-16 thread with minimal stud projection above the cup body. The UV-resistant pad handles outdoor sun exposure during extended shoots.

Heavy Equipment Mounting with Clearance Constraints

Engineers and technicians use the 1/4" stud variant where the available clearance between the cup body and the equipment mounting surface is too small for the 5/8" stud, but the 3/8-16 thread is required by the equipment hardware specification.

Outdoor Equipment Mounting on UV-Exposed Surfaces

The UV-resistant LJ45 pad makes the LJ45AM suitable for outdoor equipment mounting on vehicle glass, exterior architectural glass, and other UV-exposed smooth nonporous surfaces.

Product Documents

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

Technical Specifications

Frequently Asked Questions

Q: What is the difference between this product (SKU 91227, 1/4" stud) and SKU 91225 (5/8" stud)?
A: Both are LJ45AM 3/8-16 mounting cups with the same 4-1/2" UV-resistant LJ45 pad, flat+curved rating, and 0°F temperature rating. The only difference is stud length: SKU 91227 has a 1/4" stud (shorter, lower-profile); SKU 91225 has a 5/8" stud (longer, more clearance). Choose based on the clearance available between the cup body and your equipment mounting surface, and the stud projection required by your equipment bracket.

Q: What is the difference between the LJ45AM (3/8-16) and the TL3AMB (1/4-20)?
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 based on your equipment’s thread specification.

Q: How do I determine the load capacity for my application?
A: Use the Wood's Powr-Grip Mounting Cup Capacity Calculator to determine the safe working load for your specific application and surface.

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 length, and thread requirement before placing your order.