Phillips Machine Screw - Flat Head, 3/8"-16 x 4"
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Phillips machine screw with a flat head in 18-8 stainless steel—3/8"-16 thread size and 4" length for fastening applications where corrosion resistance matters.
Key Features
- Phillips drive for secure tightening
- Flat head style for a countersunk/flush finish with compatible mating surfaces
- 18-8 stainless steel construction for corrosion resistance
- Coarse thread size: 3/8"-16 and length: 4"
Intended Use
- Marine and boating fastener replacement and general hardware mounting
- Bulk fastener use for brackets, housings, and low-to-medium load assemblies
- General corrosion-resistant fastening where 18-8 stainless is appropriate
Product Details
- Brand/Manufacturer reference: LNS
- Screw type: Phillips machine screw (flat head)
- Thread size: 3/8"-16
- Length: 4"
- Material: 18-8 stainless steel
- SKU: 50-00331
- Variant barcode: omitted (unverified; provided in scientific notation)
Parts Desk Insights
Best Use Case: Use for projects needing a Phillips-drive machine screw with a flat head and 18-8 stainless durability.
Common Issues: If the screw sits proud or doesn’t seat properly, verify the countersink/counterbore geometry of the mating part and confirm thread engagement (3/8"-16) before tightening. Use the correct driver size to help prevent stripping or cam-out.
Related Products & Accessories
- Fasteners & Mounting - Browse the fasteners category for matching screws, washers, and related mounting hardware.
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.