MIDWEST FASTENER CORP
MIDWEST FASTENER CORP 51138 Hitch Pins hardware
Grade 5 steel hitch pins secure trailers and implements in automotive and agricultural use
- TypePins
- Grade 5 steel resists shear under heavy loads
- Red head allows quick visual identification on the job
- 3/4" diameter fits standard receiver tubes
- 6-1/2" usable length spans common hitch assemblies
- New condition ensures full rated strength from first use
Hitch pins for trailer attachment
These grade 5 steel hitch pins connect a trailer to a vehicle in automotive, agriculture and lawn-care environments. The red head provides visible identification during hookup. They suit owners who need a basic fastening method for towing equipment. Builders who require a locking mechanism or a larger-diameter pin should select a different style.
Practical limits of the pin connection
The pin relies on a simple through-hole fit and clip retention rather than a threaded or locking design. Vibration or heavy side loads can work the clip loose over time, so regular inspection is necessary. The fixed length and diameter mean the pin only fits hitch receivers and implement brackets that match those dimensions. Users needing adjustable length or higher shear ratings must choose another fastener.
Grade 5 steel strength rating
The grade 5 designation indicates a medium-carbon steel heat-treated for higher tensile strength than standard low-carbon hardware. This rating is the single specification that determines whether the pin can handle the expected trailer tongue weight and dynamic loads. Verify the grade requirement in your hitch or implement manual before installation.
Highlights
- Grade 5 steel resists shear under heavy loads
- Red head allows quick visual identification on the job
- 3/4" diameter fits standard receiver tubes
- 6-1/2" usable length spans common hitch assemblies
- New condition ensures full rated strength from first use
Specifications
| Brand | MIDWEST FASTENER |
|---|---|
| Type | Pins |
Questions about this item
What does the 51138 model number identify?
Model 51138 is the manufacturer part number for this specific hitch pin from Midwest Fastener Corp.
How does the Grade 5 steel rating affect real-world towing?
Grade 5 steel provides medium-strength tensile performance suitable for standard trailer hitch loads in automotive and agricultural use.
What hitch pin diameter does the standard hitch receiver accommodate?
The 3/4 inch diameter matches common receiver tube holes for secure trailer attachment.
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