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Description
ARP 1/4 -20 X 3.500 in 12PT BLACK OXIDE Pack of 5 # 640-3500ARP 1 4 20 X 3. 500 in 12PT BLACK OXIDE Pack of 5 # 640 3500 Please call for assistance Thread Size: 1 4 20 in. Underhead Length (in): 3. 500 in. Fastener Head Style: 12 point Fastener Material: Chromoly Fastener Finish: Black oxide Fastener Yield Strength (psi): 170,000 psi Wrench Diameter: 5 16 in. Washers Included: Yes Quantity: Sold as a set of 5.
ARP 1/4 -20 X 3.500 in 12PT BLACK OXIDE Pack of 5 # 640-3500Please call for assistance
Thread Size:1/4-20 in.
Underhead Length (in):3.500 in.
Fastener Head Style:12-point
Fastener Material:Chromoly
Fastener Finish:Black oxide
Fastener Yield Strength (psi):170,000 psi
Wrench Diameter:5/16 in.
Washers Included:Yes
Quantity:Sold as a set of 5.
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.
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4.5 ★★★★★
Based on 1961 reviews
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Product Reviews
★★★★★ 5
Good oil and price
Size: Single of 2.6 fl. oz, Number of Items: 1
Good oil good price. †
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 15, 2026
★★★★★ 4
Stinky, but Made in USA
Size: 2.6 fl. oz (Pack of 12), Number of Items: 12
I bought this product because it was one of the few 40:1/50:1 synthetic 2 cycle oils on Amazon. I have machines that take both, so it's a nice thing to have just 1 gas mix. Anyway, I'd say this product works. My leaf blower hasn't seized up or anything after hours of use, but this oil is noticeably more stinky than the last random, generic product I bought at the farm store. It's a kind of harsh pollution kind of smell. It's hard to describe. It doesn't put out a cloud of smoke. It's just stinky. Not the smell of what I'm familiar with the old, non-synthetic 2-cycle oils of the past. Anyway, I thought you should know. I gave this review an extra star for Made in USA.
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Reviewed in the United States on October 5, 2024
★★★★★ 5
Reasonable price
Size: Single of 13 fl. oz, Number of Items: 1
Great product
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Reviewed in the United States on March 10, 2026
★★★★★ 5
Worked great
Size: Single of 13 fl. oz, Number of Items: 1
That’s what I needed it to do
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Reviewed in the United States on May 12, 2026
★★★★★ 5
Get the larger one if you use more than a gallon a year.
Size: Single of 2.6 fl. oz, Number of Items: 1
Exactly as ordered. Price point is fine for mixing in 1 gallon of gas. I only use 1 gallon of this mix every year in my weed wackers.
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Reviewed in the United States on April 26, 2026
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