Cap Screw - Hex Head, 3/8"-16 x 4-1/2"
Free returns on all eligible orders
You have 30 days to request a return. All sale items are final sale.
A corrosion-resistant hex head cap screw sized for marine hardware installations where a strong, wrench-tightened fastener is needed.
Key Features
- Hex head drive for secure tightening with a wrench
- 3/8"-16 coarse thread for the specified application
- 18-8 stainless steel for improved corrosion resistance in marine environments
- Cap screw format designed for dependable clamping under proper bolt-up
Intended Use
- General marine and outdoor fastener replacement (where 3/8"-16 x 4-1/2" hex cap screws and 18-8 stainless steel are specified)
- Accessory and hardware mounting using standard through-bolt clamping
Product Details
- Type: Cap Screw (Hex Head)
- Material: 18-8 Stainless Steel
- Thread: 3/8"-16
- Length: 4-1/2"
- LNS SKU: 50-00058
- Variant/pack info: Single item variant shown (SKU 50-00058).
Parts Desk Insights
Best Use Case: Best used when you need a replacement hex cap screw with the exact size (3/8"-16 x 4-1/2") and material (18-8 stainless) to maintain clamp strength and corrosion resistance.
Common Issues: Common issues with this style are mismatched length/thread (leading to insufficient thread engagement or bottoming), and reusing damaged hardware—always confirm the existing screw size before installation and check related parts (washers, mating surfaces) for proper alignment and sealing.
Related Products & Accessories
- Browse Fasteners & Mounting - Find matching nuts, washers, and other bulk fasteners for the same installation.
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 1-3 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
Returns & Satisfaction Guarantee
We stand firmly behind the quality of every product we sell. Your confidence matters to us — and we back it with a straightforward 30-Day Satisfaction Guarantee.
If you are not fully satisfied, you may request a return within 30 days of delivery. All returns must receive pre-approval prior to being sent back. Unauthorized returns will not be accepted.
To qualify for a return:
Item must be in new, unused condition
Product must be in its original packaging
All parts, components, hardware, manuals, and accessories must be included
Packaging must be undamaged and suitable for resale
Important:
Electronics are strictly inspected. No returns on open-box electronics. Exceptions may apply only with prior written approval. Any electronic unit that has been installed, powered, activated, or altered may not be eligible for return.
We are serious about product integrity — and equally serious about taking care of our customers. If there is ever a product issue, contact us immediately so we can make it right.
For return authorization, please contact our support team before shipping anything back.