Somta Series 1NA – 7.94 mm (No. 4) HSS Centre Drill

Somta Series 1NA – 7.94 mm (No. 4) HSS Centre Drill | 1NA0004 The SOMTA 1NA0004 is a precision High-Speed Steel Centre Drill (No. 4) manufactured to American Standard Form...
$22.00
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$22.00
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Vendor: SOMTA
SKU: 1NA0004
Availability: In Stock
Subtotal: $22.00
Somta Series 1NA – 7.94 mm (No. 4) HSS Centre Drill

Somta Series 1NA – 7.94 mm (No. 4) HSS Centre Drill

$0.00 $22.00

Somta Series 1NA – 7.94 mm (No. 4) HSS Centre Drill

$0.00 $22.00

Somta Series 1NA – 7.94 mm (No. 4) HSS Centre Drill | 1NA0004

The SOMTA 1NA0004 is a precision High-Speed Steel Centre Drill (No. 4) manufactured to American Standard Form A (60°). Designed for accurate pilot and countersink hole production before turning, grinding, or secondary drilling operations, this centre drill provides excellent concentricity, dimensional accuracy, and surface finish. Its robust HSS body delivers outstanding hardness, heat resistance, and durability in all general-purpose machining applications.

Ideal for toolrooms and production environments, the Somta 1NA No. 4 features finely ground flutes and a bright finish that ensure smooth chip evacuation and burr-free cutting. Perfect for use on steels, cast irons, and non-ferrous alloys where precision centering and repeatability are essential.

Key Features & Benefits

  • High-Speed Steel (HSS) – Provides excellent toughness, heat resistance, and long tool life.
  • Form A 60° Included Angle – Meets American Standard geometry for accurate pilot and countersink formation.
  • Bright Finish – Ensures reduced friction, cleaner hole walls, and superior surface quality.
  • Precision-Ground Flutes – Facilitates smooth chip evacuation and reliable cutting performance.
  • Rigid Construction – Short, stable design minimizes deflection and improves concentricity at high speeds.

Technical Specifications

  • Part No: 1NA0004
  • Series: 1NA (Centre Drills – American Standard Form A)
  • Tool Type: HSS Centre Drill No. 4
  • Pilot Diameter (d): 3.18 mm
  • Body Diameter (d₁): 7.94 mm (≈ 5/16″)
  • Web Length (l₂): 3.2 mm
  • Flute Length (l₁): 54 mm
  • Point Angle: 60° Included Angle (Form A)
  • Finish: Bright Finish
  • Material: High-Speed Steel (HSS)
  • Suited Materials: General engineering steels, cast irons, and non-ferrous metals

Why Choose SOMTA Cutting Tools?

  • Precision Engineering – Manufactured to ANSI standards for dimensional accuracy and repeatability.
  • Reliable Performance – Maintains true centre alignment and smooth hole geometry throughout use.
  • Industrial Durability – Hardened HSS construction withstands heavy production use and extended service life.
  • Trusted Brand Quality – Crafted by SOMTA Tools, a global leader in cutting-tool technology since 1954.

The SOMTA 1NA0004 offers exceptional accuracy, surface finish, and longevity for professional centre-drilling applications. Available through Twin Eagle Imports — your reliable partner for premium industrial cutting tools and machining solutions.

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Shipping

Shipping within Australia is free. Please note delivery times to remote and very remote (Zone 3 and 4 postcodes) destinations around Australia will have longer delivery times due to postal processing and the distance to destination. Our handling time will remain as next day dispatch on all orders placed before 8am, ensuring you receive your item as quickly as possible.

AU Post is used for all shipping unless very large items require a courier. Tracking will be provided on all purchases.

Returns

Our policy lasts 30 days. If 30 days have gone by since your purchase, unfortunately we can’t offer you a refund or exchange.

To be eligible for a return, your item must be unused and in the same condition that you received it. It must also be in the original packaging.

Several types of goods are exempt from being returned. Perishable goods such as food, flowers, newspapers or magazines cannot be returned. We also do not accept products that are intimate or sanitary goods, hazardous materials, or flammable liquids or gases.

Additional non-returnable items

Gift cards
Downloadable software products
Some health and personal care items

To complete your return, we require a receipt or proof of purchase.

Please do not send your purchase back to the manufacturer. Any item not in its original condition, is damaged or missing parts for reasons not due to our error
Any item that is returned more than 30 days after delivery

Refunds (if applicable)

Once your return is received and inspected, we will send you an email to notify you that we have received your returned item. We will also notify you of the approval or rejection of your refund.
If you are approved, then your refund will be processed, and a credit will automatically be applied to your credit card or original method of payment, within a certain amount of days.

Late or missing refunds (if applicable)

If you haven’t received a refund yet, first check your bank account again. Then contact your credit card company, it may take some time before your refund is officially posted. Next contact your bank. There is often some processing time before a refund is posted. If you’ve done all of this and you still have not received your refund yet, please contact us at mailto:accounts@twineagleimports.com.au.

Sale items (if applicable)

Only regular priced items may be refunded, unfortunately sale items cannot be refunded.

Exchanges (if applicable)

We only replace items if they are defective or damaged. If you need to exchange it for the same item, send us an email at mailto:accounts@twineagleimports.com.au and send your item to: Twin Eagle Imports PTY LTD, 198 spinebill dr, greenbank QLD 4124, Australia.

Gifts

If the item was marked as a gift when purchased and shipped directly to you, you’ll receive a gift credit for the value of your return. Once the returned item is received, a gift certificate will be mailed to you.

If the item wasn’t marked as a gift when purchased, or the gift giver had the order shipped to themselves to give to you later, we will send a refund to the gift giver and he will find out about your return.

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