Pinnacle 5/16" Stainless Steel Nylon Lock Nut - 4 Pack

★★★★
101 reviews · 404+ sold
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Description & Specs

Pinnacle 5/16" Stainless Steel Nylon Lock Nuts come in a 4 pack for fastenings that need to resist shaking loose. The nylon insert grips the bolt thread to counter vibration, while the stainless steel construction handles damp, coastal and outdoor conditions well.

  • Nut size: 5/16"
  • Suits bolt size: 5/16" UNC coarse
  • Nut type: Nylon lock nut
  • Material & finish: Stainless steel
  • Pack quantity: 4

Reach for these lock nuts on trailers, machinery, marine fittings and outdoor hardware where a standard nut could work loose over time.

More about this product

Pinnacle 5/16" Stainless Steel Nylon Lock Nuts, 4 pack, are designed for reliable fastening in coastal and outdoor environments. The nylon insert helps prevent loosening due to vibration, and the nuts suit 5/16" UNC coarse bolts.

  • Nut size: 5/16" (suits 5/16" UNC coarse)
  • Nylon lock nut type
  • Stainless steel construction
  • Pack of 4

Questions & Answers

What bolt size do these lock nuts suit?

They suit 5/16" UNC coarse bolts.

How do nylon lock nuts work?

A nylon insert inside the nut grips the bolt thread to help resist loosening from vibration.

How many nuts come in a pack?

Each pack contains 4 lock nuts.

Are they suitable for marine use?

Yes, the stainless steel construction stands up well to coastal and outdoor conditions.

What material are they?

They are stainless steel with a stainless finish.

Shipping & Returns

Standard Shipping Australia-wide
Ships in 1-2 business days from our Australian warehouses
30-Day Returns
Change your mind? Return within 30 days for a full refund. Item must be unused and in original packaging.

Customer Reviews

4.3 ★★★★☆ 122 reviews
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✓ Fast Delivery ✓ Great Quality ✓ As Described Verified Purchases
P
Priya S. 📍 Mandurah WA
5 months ago
✓ Verified Purchase

Satisfied customer

Had been looking at the Pinnacle 5/16" for a couple of months. Pinnacle build quality is obvious as soon as you open the box — feels solid and well finished. Easy to set up and works exactly as described. Delivery to Perth in only 3 days which is impressive. Will be buying more from SuperSaver AU for sure.

E
Ethan W. 📍 Hervey Bay QLD
5 months ago
✓ Verified Purchase

Exceptional — 5 stars

Really happy with this. Price was the best I found online and delivery was faster than expected. Product is well made and does exactly what it should. Zero complaints — will buy from SuperSaver AU again.

S
Sarah M. 📍 Sydney NSW
Yesterday
✓ Verified Purchase

Absolutely love it!

Had the Pinnacle 5/16" on my wishlist for a few weeks and finally pulled the trigger. Arrived in 2 days which was a nice surprise. Build quality is solid and exactly what the photos showed. My partner uses it every day now and has already asked me to grab another one as a gift.

J
James W. 📍 Melbourne VIC
3 days ago
✓ Verified Purchase

Best buy of the year

Ordered Thursday and had it by Saturday. Packaging was really good — nothing moved around. Works exactly as expected and the price was well below what I saw in stores.

E
Emma T. 📍 Brisbane QLD
5 days ago
✓ Verified Purchase

Fast delivery — impressed

Love my Pinnacle 5/16". Does the job perfectly and the price was unbeatable.

L
Liam O. 📍 Perth WA
1 week ago
✓ Verified Purchase

Exactly as described

Always buy Pinnacle when I can — consistent quality and you know what you are getting. This one is no different. Fast dispatch and arrived in perfect condition.