Trailer Door Hardware / Weld-On Hinge / Greaseable Aluminum Hinge
Heavy Duty Aluminum Greaseable Weld-On Trailer Hinge
A heavy duty aluminum weld-on hinge with a center grease zerk, built for trailer doors, ramps, gates, cabinets, and fabrication projects where a serviceable hinge is needed.
Part Number: DH-A 9" Overall Length 1/2" Pin Size
Key Measurements & Specs
| Specification | Detail |
| Part Number / SKU | DH-A |
| Product Type | Greaseable weld-on hinge |
| Material | Aluminum |
| Overall Length | 9" |
| Pin Size | 1/2" |
| Flat Hinge Width | 1 1/4" |
| Flap Length | Each individual flap is 3" long |
| Flap Thickness | 0.20" |
| Quantity Included | 1 hinge |
Fitment / Application
| Category | Details |
| Primary Use | Trailer door, ramp, gate, cabinet, and fabrication hinge applications |
| Mounting Style | Weld-on installation |
| Service Style | Greaseable through center-mounted grease zerk |
| Fitment Method | Verify hinge length, pin size, flat width, flap thickness, and welding surface before ordering |
| Important Note | Application fit depends on the trailer, door, gate, or fabricated mounting surface. Confirm measurements before welding. |
Top Features
| Feature | Buyer Benefit |
| Aluminum Construction | Useful for trailer and fabrication applications where aluminum hardware is preferred |
| Greaseable Design | Center grease zerk allows routine service after installation |
| Three-Piece Hinge Layout | Separates into three hinge sections for weld-on alignment and door/gate fabrication use |
| 1/2" Pin Size | Provides a heavy hinge pin profile for demanding trailer hardware applications |
Overview
This DH-A heavy duty aluminum greaseable weld-on hinge is designed for trailer doors, ramps, gates, cabinets, and general fabrication work. The hinge measures 9" overall, uses a 1/2" pin, and includes a center grease zerk for service access after installation. Each individual hinge flap measures 3" long and 0.20" thick, with a 1 1/4" flat hinge width.
R&P Service Insight
For weld-on hinges, the most important buyer checks are material match, mounting surface, hinge length, and pin size. Confirm the hinge dimensions against the door or gate before welding.
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Weld-On Fit: Verify the mounting surface is suitable for an aluminum weld-on hinge.
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Service Access: Position the hinge so the grease zerk remains reachable after installation.
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Alignment: Test-fit the hinge sections before final welding to help prevent door or gate binding.
R&P Knowledge Hub
Compatibility: This hinge is application-based. Match the 9" overall length, 1/2" pin size, 1 1/4" flat width, 3" flap length, and 0.20" flap thickness to your trailer or fabricated part before ordering.
Vehicle / System Fit: Commonly used for trailer doors, ramps, gates, cabinets, and weld-on trailer hardware applications where the measurements and material are appropriate.
Installation Notes: Welding should be performed by a qualified installer using appropriate procedures for the hinge material and mounting surface.
Performance Insight: A greaseable hinge is easier to service over time than a sealed, non-serviceable hinge, especially on trailer doors and gates exposed to outdoor conditions.
Brand & Fitment Note
Selling Brand: R&P Carriages
Application Reference: Trailer door, ramp, gate, cabinet, and fabrication use are application references only. Final fit depends on your measurements and installation setup.
What This Means: This listing is for one DH-A heavy duty aluminum greaseable weld-on hinge, not a guaranteed OEM-branded replacement unless specifically stated.
Before Ordering: Verify overall length, flap length, hinge width, flap thickness, pin size, weld surface, clearance, and service access to the grease zerk.
R&P Repair Insight
When replacing or adding a weld-on hinge, do not rely on appearance alone. Measure the existing hinge and confirm the pin size, leaf/flap dimensions, and available mounting surface before installation.
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Check Pin Size: This hinge uses a 1/2" pin. Confirm that works for your door, gate, or ramp load and clearance.
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Check Overall Length: The full hinge is 9" long. Make sure your mounting area has adequate room.
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Check Grease Zerk Access: The zerk is located in the middle of the hinge. Avoid mounting positions that block service access.
Features
Heavy Duty Aluminum Hinge
Built as an aluminum weld-on hinge for trailer doors, ramps, gates, cabinets, and fabrication applications.
Greaseable Center Zerk
The grease zerk is located in the center of the hinge for routine lubrication access after installation.
9" Overall Length
The full hinge measures 9" long, giving buyers a clear measurement for replacement and fabrication planning.
Three-Piece Hinge Design
The hinge is separated into three pieces, with each individual flap measuring 3" long and 0.20" thick.
Included Components
| Quantity | Item |
| 1 | Heavy duty aluminum greaseable weld-on hinge, Part Number DH-A |
| Not Included | Mounting hardware, welding materials, and installation tools are not specified as included |
Important Fitment Note: Verify all measurements, material compatibility, mounting surface, weld location, hinge clearance, pin size, grease zerk access, and included components before installation. This is a weld-on hinge and should be installed by a qualified person using appropriate welding procedures.
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