9" Hand Cup for Flat or Curved Surfaces

Wood's Powr-Grip N5450CS — 9" Concave Flexible-Edge Metal Handle Vacuum Hand Cup for Flat and Curved Surfaces (150 lbs / 68 kg)

The Wood's Powr-Grip N5450CS is a heavy-duty vacuum hand cup engineered for fast, reliable attachment to both flat and gently curved smooth or slightly textured nonporous surfaces, with a rated load capacity of 150 lbs (68 kg). The defining feature of the N5450CS is its 9" (23 cm) concave VPCS9 pad with a flexible vacuum pad edge — a pad geometry specifically designed to conform to the surface profile of gently curved materials, enabling a fast, secure vacuum seal on surfaces with a minimum radius of 21½" (545 mm) without the extended pumping effort required by standard flat pads on curved surfaces. With an all-metal handle and plunger, a minimum material thickness rating of just 1/8" (3.18 mm), and an operating range down to 0°F (-18°C), the N5450CS is a versatile, high-capacity hand cup suited for glaziers, stone fabricators, automotive glass technicians, and industrial material handlers working across a wide range of flat and gently curved applications. The N5450CS (SKU: 91720, Model: N5450CS) is manufactured by Wood's Powr-Grip. Not for use with thin, fragile materials.

The N5450CS occupies a distinct position in the WPG hand cup lineup: it bridges the gap between the flat-surface-only N5450 (9" standard pad, 150 lb, flat only) and the curved-surface N6450 (10" standard pad, 175 lb, min. 13" radius). The N5450CS matches the N5450’s 9" pad diameter and 150 lb capacity, but adds curved surface capability through its concave flexible-edge pad design — at the cost of a larger minimum radius requirement (21½" vs. 13" on the N6450). This makes the N5450CS the correct choice for gently curved large-radius surfaces — such as large-diameter cylindrical glass, gently curved architectural panels, and large automotive glass — where the N6450’s standard pad would work but the N5450CS’s flexible edge provides faster attachment. The slight texture surface rating and 1/8" minimum thickness also extend its applicability beyond the N5450.

Key Features & Benefits

Concave 9" Flexible-Edge Pad (Model VPCS9) — Fast Attachment on Curved Surfaces

The VPCS9 concave pad features a flexible vacuum pad edge that conforms to the surface profile of gently curved materials, enabling fast vacuum seal formation without the extended pumping effort required when a flat pad must flex against a curved surface. The concave geometry pre-positions the pad to match the curvature of large-radius surfaces, reducing attachment time and improving seal consistency across repeated lifts. This is the defining design feature of the N5450CS and the primary reason to select it over the standard N5450 when working with curved surfaces at or above the 21½" minimum radius.

Flat and Curved Surface Compatibility (Min. 21½" / 545 mm Radius)

The N5450CS is rated for both flat and curved smooth or slightly textured nonporous surfaces, with a minimum curved surface radius of 21½" (545 mm). This larger minimum radius compared to the N6450 (13") and LJ6VH (12") reflects the concave pad geometry — the VPCS9 pad is optimized for gently curved large-radius surfaces rather than tightly curved ones. Applications include large-diameter cylindrical glass, gently curved curtain wall panels, large automotive windshields and rear glass, and other large-radius curved architectural elements. Always confirm the surface radius before use on curved applications.

Smooth and Slight Texture Surface Rating

Unlike most WPG hand cups rated for smooth surfaces only, the N5450CS is rated for both smooth and slightly textured nonporous surfaces — expanding its applicability to lightly textured glass, matte-finish panels, and other surfaces with minor surface variation that would prevent a standard smooth-surface cup from achieving a full seal. This dual surface rating, combined with the curved surface capability, makes the N5450CS one of the most versatile single cups in the WPG hand cup lineup.

150 lb (68 kg) Rated Load Capacity

The N5450CS matches the N5450’s 150 lb (68 kg) load rating, making it suitable for heavy flat and gently curved panels including large architectural glass, heavy stone slabs, and large automotive glass panels. The all-metal handle and plunger provide the structural rigidity needed to control heavy loads safely during lifting and positioning. Always confirm the actual panel weight before selecting this tool for a lift.

All-Metal Handle and Plunger

Both the handle and plunger are constructed from metal, providing maximum structural rigidity and long-term durability for repeated heavy-duty use in professional glazing, stone fabrication, and industrial material handling environments. The all-metal construction resists deformation under sustained heavy loads and delivers consistent vacuum engagement and release action over the tool’s service life — matching the construction standard of the N5450 and exceeding the hybrid plastic plunger found on some other WPG models.

1/8" (3.18 mm) Minimum Material Thickness

The N5450CS is rated for materials as thin as 1/8" (3.18 mm) — thinner than the N6450’s 1/4" minimum — extending its applicability to thinner glass panels, thin stone veneers, and lightweight architectural panels that would be excluded from use with the N6450. Despite this thinner material rating, the product is explicitly not for use with thin, fragile materials that could fracture under vacuum stress — always confirm material strength and thickness before use.

Extended Low-Temperature Rating (0°F / -18°C)

The N5450CS is rated for operation down to 0°F (-18°C), making it suitable for cold storage facilities, outdoor winter job sites, and refrigerated environments where standard-rated cups (10°F minimum) may experience rubber hardening and reduced seal performance. This extended cold-temperature rating is particularly relevant for glaziers and installers working on large architectural glass projects in northern climates or cold-weather construction environments.

Red-Line Vacuum Loss Indicator — Protective Carrying Case Included

The built-in red-line indicator provides a continuous visual warning if vacuum pressure drops significantly during a lift, giving the operator an immediate alert before load failure can occur. The N5450CS ships with a protective carrying case that keeps the concave pad clean, protected, and ready for use — proper pad storage is especially important for the VPCS9’s flexible edge, which must remain free of deformation and contamination to seal correctly on curved surfaces.

Common Applications

Large-Radius Curved Architectural Glass

Glaziers handling gently curved architectural glass — including large-radius curved curtain wall panels, barrel vault glass, and large-diameter curved storefront glass — use the N5450CS where the concave flexible-edge pad provides faster attachment than a standard flat pad on large-radius curved surfaces. The 21½" minimum radius covers the majority of large-radius architectural glass profiles used in commercial glazing.

Large Automotive Windshields and Rear Glass

Auto glass technicians handling large windshields and rear glass panels with gentle curvature use the N5450CS for its combination of 150 lb capacity, flexible-edge curved surface attachment, and 0°F cold rating. The 21½" minimum radius accommodates the gentle curvature of most large automotive windshields and panoramic rear glass panels.

Flat Heavy Glass and Stone Panel Handling

On flat surfaces, the N5450CS functions as a high-capacity flat-surface cup equivalent to the N5450, handling heavy plate glass, tempered glass, granite slabs, and engineered stone panels up to 150 lbs. The slight texture surface rating extends its flat-surface applicability to matte-finish glass, lightly textured stone, and other flat panels with minor surface variation.

Lightly Textured Panel Handling

For flat or gently curved panels with slight surface texture — such as matte-finish architectural glass, lightly textured composite panels, or brushed metal with minimal surface relief — the N5450CS’s slight texture rating provides vacuum attachment where smooth-surface-only cups would fail to seal fully. This is a meaningful capability gap between the N5450CS and the standard N5450.

Thin Panel and Veneer Handling

The 1/8" minimum material thickness rating makes the N5450CS suitable for thinner glass panels, stone veneers, and lightweight architectural panels that fall below the N6450’s 1/4" minimum. Always confirm the material is not thin or fragile in the sense that it could fracture under vacuum stress — the 1/8" rating indicates minimum thickness for structural integrity under vacuum, not a recommendation to use the cup on inherently fragile materials.

Cold Storage and Outdoor Winter Glass Handling

The 0°F (-18°C) low-temperature rating makes the N5450CS suitable for handling large glass panels and architectural elements in cold storage facilities, outdoor winter construction environments, and northern climate glazing projects where standard-rated cups may not perform reliably. Always verify pad seal integrity with a test load before lifting in cold conditions.

Compatible Materials

• Gently curved architectural glass (min. 21½" / 545 mm radius)
• Large automotive windshields and panoramic rear glass (min. 21½" radius)
• Flat plate glass and float glass
• Tempered and laminated safety glass (flat and gently curved)
• Matte-finish and lightly textured glass panels
• Polished granite, marble, and engineered stone (flat and gently curved)
• Lightly textured composite and architectural panels (nonporous face)
• Smooth painted or coated metal panels (flat and gently curved, within radius rating)
• Thin glass panels and stone veneers — min. 1/8" (3.18 mm) thickness, non-fragile
• Any smooth or slightly textured, nonporous flat or curved surface with min. 21½" (545 mm) radius

Not compatible with: thin, fragile materials that could fracture under vacuum stress; surfaces with radius tighter than 21½" (545 mm); rough, porous, or heavily textured surfaces; concrete, brick, unpolished stone, wood, or drywall.

Product Documents

• N5450CS Instructions (PDF)

Application Instructions

Step 1: Surface and Material Assessment

1. Confirm the surface is nonporous and smooth or only slightly textured — do not proceed on rough, heavily textured, or porous surfaces.
2. For curved surfaces, confirm the radius is 21½" (545 mm) or greater — the N5450CS is not rated for tighter radii.
3. Confirm material thickness is at least 1/8" (3.18 mm) and that the material is not thin or fragile in a way that could cause fracture under vacuum stress.
4. Verify the panel weight does not exceed 150 lbs (68 kg).

Step 2: Pad Inspection and Preparation

1. Inspect the VPCS9 concave pad for cuts, tears, deformation of the flexible edge, hardening, or contamination. Replace if damaged — a deformed or damaged flexible edge will prevent proper curved surface sealing.
2. Clean the pad contact area on the work surface — remove dust, oil, moisture, and debris.
3. In cold environments, verify pad flexibility above 0°F (-18°C) before use.

Step 3: Attaching the Cup

1. Position the concave pad against the surface — on curved surfaces, the flexible edge will conform to the surface profile; ensure full perimeter contact around the pad edge.
2. Engage the vacuum mechanism using the metal handle/plunger until firm resistance is felt. The flexible-edge design enables faster vacuum formation on curved surfaces than standard flat pads.
3. Check the red-line vacuum indicator — confirm it shows a stable, full vacuum before lifting.
4. Apply a controlled test load (firm downward pull) to verify seal integrity before committing to the full lift.

Step 4: Lifting, Positioning, and Release

1. Lift smoothly — avoid sudden jerking motions that can break the vacuum seal.
2. Monitor the red-line indicator continuously throughout the lift and during positioning.
3. Do not exceed the 150 lb (68 kg) rated load capacity.
4. Lower the load fully to a stable surface before releasing the vacuum.
5. Engage the release mechanism slowly and in a controlled manner.
6. Clean the pad after use and store in the supplied protective carrying case — protect the flexible pad edge from deformation during storage.

Technical Specifications

Safety Data Summary

Hazard Information

• Not for use with thin, fragile materials — vacuum stress can cause fracture even at the 1/8" minimum thickness if the material is inherently fragile
• Vacuum loss during a lift can result in sudden load drop, causing serious injury or property damage
• Overloading beyond 150 lbs (68 kg) rated capacity may cause sudden cup release without warning
• Use on surfaces with radius tighter than 21½" (545 mm) will prevent the flexible edge from seating correctly and significantly increases drop risk
• Deformation or damage to the VPCS9 flexible pad edge will prevent proper curved surface sealing — inspect before every use
• Damaged or contaminated pads must be replaced before use
• In cold environments, verify pad flexibility and seal integrity before each lift — rubber performance approaches its limit at 0°F (-18°C)
• Do not use above 5,000 ft (1,500 m) elevation

Personal Protective Equipment

• Safety glasses or face shield when handling glass panels
• Cut-resistant gloves rated for glass and stone handling
• Steel-toed safety footwear
• Hard hat when working in overhead or multi-level environments
• Insulated gloves and appropriate cold-weather PPE when operating at or near 0°F (-18°C)

Safe Handling

• Inspect the VPCS9 flexible pad edge before every use — deformation or damage prevents proper curved surface sealing
• Confirm surface radius is 21½" (545 mm) or greater before attaching to curved surfaces
• Confirm material is not thin or fragile before use, even if thickness exceeds the 1/8" minimum
• Never exceed the rated 150 lb load capacity
• Monitor the red-line indicator continuously — lower the load immediately if vacuum loss is detected
• Store in the supplied carrying case with the flexible pad edge protected from deformation

Frequently Asked Questions

Q: How does the N5450CS differ from the standard N5450?
A: Both share the same 9" pad diameter and 150 lb capacity, but the N5450CS uses the VPCS9 concave flexible-edge pad (vs. standard G0725 flat pad on the N5450) that enables attachment to curved surfaces with a minimum radius of 21½" (545 mm). The N5450CS also has an all-metal plunger (vs. unspecified on N5450), a slight texture surface rating, a 1/8" minimum material thickness rating, and a 0°F cold rating. Choose the N5450CS when you need curved surface capability or slight texture compatibility at the same 150 lb capacity.

Q: How does the N5450CS differ from the N6450?
A: The N6450 has a larger 10" pad and higher 175 lb capacity, but a tighter 13" minimum radius that handles more tightly curved surfaces. The N5450CS has a 9" pad, 150 lb capacity, and a larger 21½" minimum radius — optimized for gently curved large-radius surfaces where the concave flexible-edge pad provides faster attachment. The N5450CS also handles slight texture and thinner materials (1/8" vs. 1/4" minimum). Choose the N6450 for tighter curves and heavier loads; choose the N5450CS for large-radius gentle curves, slight texture, or thinner materials.

Q: What does the flexible vacuum pad edge do?
A: The flexible edge of the VPCS9 concave pad conforms to the surface profile of gently curved materials, enabling fast vacuum seal formation without the extended pumping effort required when a flat pad must flex against a curved surface. It pre-positions the pad to match the curvature, reducing attachment time and improving seal consistency on large-radius curved surfaces.

Q: Can the N5450CS be used on surfaces with slight texture?
A: Yes — the N5450CS is rated for smooth and slightly textured nonporous surfaces, unlike most WPG hand cups which are rated for smooth surfaces only. For heavily textured surfaces, the N4000TS with its low-marking soft rubber pad is the correct choice.

Q: What replacement pad does the N5450CS use?
A: The N5450CS uses the VPCS9 concave standard rubber pad (9" diameter). This is a different pad model from the G0725 used on the standard N5450 — do not substitute a flat pad on the N5450CS for curved surface applications. Replacement pads are available through Wood's Powr-Grip authorized distributors.

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, material thickness, and load requirements before placing your order.

California Residents: ⚠️ WARNING: Cancer and/or Reproductive Harm — www.p65Warnings.ca.gov