4-½” Mounting Cup w/ 1" Ball - Pack of 4

Wood's Powr-Grip LJ45PB1 — 4-1/2" Vacuum Mounting Cup with 1" RAM®-Compatible Ball for Flat and Curved Surfaces — Pack of 4

The Wood's Powr-Grip LJ45PB1 is a compact 4-1/2" vacuum mounting cup with a 1" ball connection point that is compatible with RAM® Equipment Mounting Systems, enabling the attachment of RAM® accessories and mounts to smooth, nonporous surfaces without drilling holes or permanently modifying the surface. The 1" ball interfaces directly with RAM® ball-and-socket arms, cradles, and mounting hardware, giving the LJ45PB1 access to the full RAM® accessory ecosystem on any smooth nonporous flat or curved surface. Featuring a 4-1/2" (11 cm) LJ45 standard rubber suction pad, a mounting platform height of 1-13/16" (5 cm), and rated for both flat and curved surfaces with a minimum radius of 12" (305 mm). Operable down to 0°F (-18°C). Sold as a Pack of 4 with pad protectors. The LJ45PB1 (SKU: 91255, Model: LJ45PB1) is manufactured by Wood's Powr-Grip.

The LJ45PB1 is the compact 4-1/2" counterpart to the TL6PB1 (6" RAM®-compatible mounting cup). Both use a 1" RAM®-compatible ball and share the same flat+curved rating, 0°F temperature rating, and Pack of 4 configuration. The critical difference is pad size: the LJ45PB1 uses the smaller 4-1/2" LJ45 pad, making it the correct choice when the available smooth contact area on the surface is too small for the TL6PB1’s 6" pad — including smaller curved glass sections, narrow panels, and surfaces where a 6" pad would overlap the panel edge or an adjacent surface. The LJ45 pad is not interchangeable with the TL6 pad.

Key Features & Benefits

1" RAM®-Compatible Ball — Full RAM® Accessory Ecosystem Compatibility

The LJ45PB1’s 1" ball connection point is the standard RAM® ball size used across the RAM® Mounts product line, providing direct compatibility with RAM® ball-and-socket arms, cradles, device holders, camera mounts, instrument brackets, and other RAM®-compatible accessories. RAM® accessories are sold separately and are not included.

Compact 4-1/2" LJ45 Pad — Suited for Smaller Contact Areas

The 4-1/2" (11 cm) LJ45 pad is the smaller pad option for RAM®-compatible WPG mounting cups, making the LJ45PB1 the correct choice when the available smooth contact area on the surface is too small for the 6" TL6PB1. This includes smaller curved glass sections, narrow architectural panels, and any surface where a 6" pad would overlap the panel edge or an adjacent surface. The LJ45 pad is not interchangeable with the TL6 pad — replacement pads must be specified as LJ45.

No-Drill Equipment Mounting — No Surface Damage — Repositionable

The LJ45PB1 eliminates the need for drilling holes when mounting RAM®-compatible equipment and accessories. The vacuum cup base attaches to smooth nonporous surfaces without permanent modification, leaving no marks or damage when removed. The cup can be repositioned as needed for temporary setups and changing mounting requirements.

Flat and Curved Surfaces — Min. 12" Radius — 1-13/16" Mounting Platform Height

Rated for both flat and curved smooth, nonporous surfaces with a minimum radius of 12" (305 mm). Mounting platform height is 1-13/16" (5 cm), not including the ball. Red-line indicator warns of any significant vacuum loss. Rated for operation down to 0°F (-18°C). Pack of 4 with pad protectors.

Common Applications

Small-Surface RAM® Device and Instrument Mounting

When the available smooth contact area on the surface is too small for the 6" TL6PB1, the LJ45PB1 provides the same 1" RAM® ball compatibility in a compact 4-1/2" pad footprint. Suitable for smaller curved glass sections, narrow panels, and surfaces where pad size is a constraint.

Vehicle Glass and Curved Surface RAM® Mounting

Fleet operators and mobile professionals use the LJ45PB1 to mount RAM®-compatible devices to vehicle glass and curved smooth surfaces where the smaller pad size fits the available contact area better than the 6" TL6PB1.

No-Drill RAM® System Deployment on Protected Surfaces

In environments where drilling is not permitted — including leased vehicles, finished architectural surfaces, and cleanroom environments — the LJ45PB1 provides a vacuum-based base for RAM® mounting systems without permanent modification.

Compatible Surfaces

• Flat and curved plate glass and float glass (min. 12" radius)
• Tempered and laminated safety glass (flat and curved)
• Vehicle glass and automotive surfaces (flat and curved)
• Polished granite, marble, and engineered stone (flat and curved)
• Smooth painted or coated metal panels (flat and curved)
• Any smooth, nonporous flat or curved surface with min. 12" (305 mm) radius

Not compatible with: rough, textured, or porous surfaces; surfaces with radius tighter than 12" (305 mm); surfaces contaminated with oil, wax, or debris; applications requiring permanent load-bearing attachment.

Technical Specifications

Safety Data Summary

• Vacuum loss can result in sudden equipment drop or detachment — monitor the red-line indicator during use
• Load capacity is application-dependent — use the WPG Mounting Cup Capacity Calculator to determine safe working load for your specific application and surface
• Do not use on rough, textured, or porous surfaces
• Do not use on surfaces with radius tighter than 12" (305 mm)
• Do not use for permanent load-bearing applications — this is a temporary mounting solution
• Ensure RAM® arms and accessories are rated for the intended load before attaching to the 1" ball
• Damaged or contaminated pads must be replaced before use
• Operating below 0°F (-18°C) may degrade rubber pad performance

Frequently Asked Questions

Q: What is the difference between the LJ45PB1 and the TL6PB1?
A: Both use a 1" RAM®-compatible ball and share the same flat+curved rating (min. 12" radius), 0°F temperature rating, and Pack of 4 configuration. The LJ45PB1 uses the smaller 4-1/2" LJ45 pad; the TL6PB1 uses the larger 6" TL6 pad. Choose the LJ45PB1 when the available smooth contact area is too small for the 6" TL6PB1; choose the TL6PB1 when a larger pad contact area is available and preferred. LJ45 and TL6 replacement pads are not interchangeable.

Q: Is the LJ45PB1 compatible with all RAM® Mounts products?
A: The LJ45PB1’s 1" ball is the standard RAM® ball size used across the RAM® Mounts product line and is compatible with RAM® ball-and-socket arms, cradles, and accessories designed for the 1" ball standard. Verify compatibility with your specific RAM® accessory before ordering. RAM® accessories are sold separately and are not included.

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, curvature radius, and RAM® accessory compatibility before placing your order.