Best in 7 days
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Ships within 48 hours · Estimated delivery Jun 13 - Jun 18
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Description
Hillman 5/16-18 x 3-1/2 in Stainless Steel Hex Head Cap Screw, 50-PackStainless Steel Hex Head Cap Screw, 5 16 18 x 3 1 2, 50 Pack Durable 18 8 stainless steel hex head cap screws for high torque fastening in tapped holes or with nuts. Coarse, partially threaded shank with washer face under the head delivers a secure seal and corrosion resistance for indoor outdoor projects. Key Features: Corrosion Resistant Stainless Steel: 18 8 stainless steel for long lasting performance in outdoor and marine environments High Torque
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
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Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
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Best in 7 days
Best in 7 days
Best in 7 days
Best in 7 days
4.5 ★★★★★
Based on 1902 reviews
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Product Reviews
★★★★★ 5
Great oil and makes my engine run quieter
I noticed the engine running much quieter using this oil. The pour mouth is pretty unique for this brand, you can just open the interior cap, pull up the accordion neck and pour into the engine which provides better control over traditional wide mouth, thus less messy. This oil rarely goes on sale and is typically 1.5x to 2x more expensive than the more common US brands.
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Reviewed in the United States on August 28, 2025
★★★★★ 5
Best synthetic oil BMW
Excellent synthetic oil BMW 328I
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Reviewed in the United States on February 6, 2026
★★★★★ 5
Last long
Love it ! Since I have a BMW this oil it’s good for it .
The Price is good . Last long . No engine noise
Or oil burning. Even the color looks good after 3 months.
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Reviewed in the United States on March 9, 2026
★★★★★ 5
FRIENDLY REMINDER Don't overtighten the bolts
MUCH better than the cheap plastic OEM part, Just a reminder though, these thread into an aluminum block so be very careful to start them finger tight first, then evenly tighten both bolts to push the fitting into the chamber. If you don't, it will slightly misalign and you run the risk of stripping the threads. The one comes with the replacement o ring, and be sure to get some antifreeze on that seal prior to attempting to push it into the chamber. IT IS A TIGHT FIT, but that's what you want, so just be careful. You might also want an extra hose clamp on hand, as the one that came with this began to bend as it got tight, so I had to replace it for peace of mind. Overall, great product though.
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Reviewed in the United States on January 9, 2026
★★★★★ 5
Strong product
Great quality
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Reviewed in the United States on March 11, 2026
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