5/16" x 1-3/4" 18 TPI UNC Imperial Coarse Hex Bolt High Tensile Grade 8 Zinc Plated
Free Shipping
Free Shipping
Estimated Delivery Time
For an estimated delivery time, please visit the product page of the item you wish to purchase. Enter your postcode into the "When will I receive this item?" section to receive a tailored delivery estimation. Please note that these estimates can vary based on stock availability, shipping conditions, and other variables.
Free Shipping
Every order will automatically receive free standard shipping, ensuring you get your items without any additional cost.
Free Express Shipping
Orders over $50 qualify for free express shipping, with an estimated delivery timeframe of 1-4 business days.
Next Business Day Delivery
Next business day delivery is available for selected postcodes and is subject to AusPost terms and conditions. Please refer to the table below for eligible postcodes:
| City/State | Eligible Postcodes |
| Canberra | 0200-0250, 2600-2620, 2900-2914 |
| Sydney | 1000-1920, 2000-2249, 2555-2574, 2740-2786 |
| Melbourne | 3000-3207, 3340-3341, 3750, 3755-3757, 8000-8785 |
| Brisbane | 4000-4209, 9016-9019 |
| Gold Coast | 2484-2490, 4210-4275, 9726 |
| Adelaide | 5000-5171, 5800-5950 |
| Perth CBD | 6000-6005, 6800-6899 |
| Tasmania | 7000-7019, 7050-7053, 7055, 7248-7251, 7253, 7258, 7261, 7267, 7275-7300, 7306, 7310, 7311-7315, 7320-7322, 7325, 7800-7899 |
Same-day Dispatch
DMS Fasteners aims to dispatch all weekday orders placed before 2:00 PM (AEST) on the same day.
Order Tracking
Once your order has been dispatched from our warehouse, you will receive an email notification containing your shipment tracking information. This allows you to monitor your package's journey and get a clear estimate of its arrival.
International Shipping Policy
Please be aware that international shipments may be subject to import duties, taxes, and customs processing fees, which are levied once the package reaches its destination country. These charges are the responsibility of the recipient and are not included in our shipping fees.
Important Notes
While we strive to provide accurate delivery estimates, please be aware that delays can occur due to factors such as stock availability, shipping conditions, and other unforeseen variables. We appreciate your understanding and patience in such situations.
Additionally, please note that tracking information may or may not be provided depending on the item purchased. If tracking is available, you will receive an email notification with your shipment tracking details once your order has been dispatched.
No Deadline Returns
No Deadline Returns
Unlimited Returns with Full Store Credit
While we offer an unlimited timeframe to return your items, please note that all returns will be refunded as store credit equivalent to the full order value. This helps us maintain our high standards of quality and service. Please note that cancellations will also be treated as returns and will be refunded as store credit.
Return Conditions
To be eligible for a return, your item must be in the same condition you received it-unused, uninstalled, and in its original packaging. You’ll also need the receipt or proof of purchase.
Start Your Return
- Self-Serve Returns (For Registered Customers): If you have a customer account, you can initiate a return directly through our self-serve returns portal. This streamlined process is quick and easy.
- Via Email: If you don’t have a customer account, no problem! Just email us at info@dmsfasteners.com.au to start your return process.
Please note, the buyer is responsible for the return shipping label and associated costs.
Return Process
Once your return request is accepted, we will provide you with instructions on how and where to send your package. Please remember, items sent back to us without first requesting a return will not be accepted.
Damages and Issues (30 days)
Upon receiving your order, please inspect it and contact us within 30 days if the item is defective, damaged, or if you receive the wrong item. We will evaluate the issue and work promptly to resolve it.
Exchanges
To exchange an item, return the original item, and once the return is accepted, you can make a separate purchase for the new item.
Refunds
After we receive and inspect your return, we will inform you whether the refund was approved or not. Approved refunds will be processed, and a credit will automatically be applied to your original method of payment within 5 business days. Note that it may take some time for your bank or credit card company to process and post the refund.
If more than 15 business days have passed since we approved your return, please contact us at info@dmsfasteners.com.au.
Initiate A Return
To initiate a return, please sign into your account and open a return ticket:
Initiate a Return
| Type | : | Hex Bolts |
| System of Measurement | : | Imperial |
| Bolt Size | : | 5/16" |
| Length | : | 1-3/4" |
| Coarse/Fine | : | Coarse |
| Pitch | : | 18 TPI |
| Grade/Class | : | Grade 8 |
| Finish | : | Zinc Plated |
| Across Flats | : | 1/2" |
| Minimum Thread Length | : | 7/8" |
| Head Height | : | 17/64" |
| Listing Group ID | : | HB5/16-18G8ZP |
| Disclaimer | : | This information is provided for general informational purposes only. While efforts have been made to ensure accuracy and reliability, it is offered without warranty. Consultation with professionals or experts is advisable for specific situations. The authors, publishers, and distributors bear no responsibility for errors, omissions, or actions based on this information. Users assume all associated risks, and reliance on any part of the content is at the user's own risk. |
Premium-grade hex bolts for secure fastening in construction and machinery. Durable, corrosion-resistant, and available in various sizes. Explore top-tier Class 4.6, 8.8, 10.9, and 12.9 metric hex bolts, alongside Grades 5 and 8 imperial hex bolts for unmatched fastening. Shop our selection for reliable, high-tensile fasteners.
Hex Bolt Finishes: Zinc Plated vs. Black Oxide
Finish on Hex Bolts: The finish of a hex bolt refers to its surface treatment, which enhances corrosion resistance, appearance, and durability.
Zinc Plated Finish: Zinc plating adds a protective zinc layer that guards against corrosion. It's ideal for outdoor or moist environments due to its superior corrosion resistance. Common use cases include construction, automotive, and marine applications where the bolts are exposed to the elements.
Black Oxide Finish: Black oxide provides a black finish whilst maintaining corrosion resistance, primarily used for its visual appeal. It's best for indoor applications where corrosion is less of a concern, such as in home appliances, electronics, and decorative installations.
Metric Class and Imperial Grade Strengths for Hex Bolts
When selecting hex bolts, understanding the strength differences between metric classes and imperial grades is crucial for ensuring the integrity of your project.
Metric Class Strengths:
- Class 4.6: These bolts are made of low or medium carbon steel and have a minimum tensile strength of 400 MPa and a yield strength of 60% of the tensile strength. They are suitable for light applications where high strength is not required, such as securing furniture or light fixtures.
- Class 8.8: A medium carbon steel bolt that's been hardened and tempered, Class 8.8 has a tensile strength of 800 MPa and a yield strength of 80% of the tensile strength. These are appropriate for automotive applications, structural steelwork, and equipment manufacturing.
- Class 10.9: These bolts are alloy steel, quenched and tempered, with a tensile strength of 1,000 MPa and a yield strength of 90% of the tensile strength. They're used in high-stress applications like engine mounts, suspension systems, and heavy equipment where strength is critical.
- Class 12.9: The highest metric class for strength, these alloy steel bolts have a tensile strength of 1,200 MPa and a yield strength of 90% of the tensile strength. They are used in precision machinery and applications where the highest strength is necessary, such as in the aerospace industry.
Imperial Grade Strengths:
- Grade 5: These bolts are made from medium carbon steel and are quenched and tempered. They have a minimum tensile strength of 120 ksi and are suitable for automotive applications, OEM (original equipment manufacturer) service, and repair where moderate strength is sufficient.
- Grade 8: Made from medium carbon alloy steel and heat-treated, these bolts have a higher tensile strength of 150 ksi. They are used in demanding applications such as vehicle suspensions, heavy equipment, and industrial machinery where high tensile strength is a must.
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Over 20,000 Happy Customers Across All Channels
Really good to deal with, one of the best, I will buy again and again, fast shipping times.
There guys were great! Fast to dispatch and followed up with a phone call. Great after sales service and my order was quite small so huge thumbs up from me!
Well priced item. Prompt postage. Great service.
Very happy with my purchase. The screws I bought were good quality and came relatively quickly. DMS have a good range and quantity options to choose from so I will be buying from them again.
Very good value and they arrived in very quick time. It's a lot cheaper and easier than shopping at Bunnings.
