What does BSW 5/16" x 18 mean?

BSW is British Standard Whitworth (BS 84) with a 55° flank angle. 5/16" is the nominal diameter and 18 is the number of threads per inch (TPI).

What does DIN 223 (DIN EN 22568) specify?

It defines dimensions and tolerances for round dies to ensure interchangeability and consistent thread quality.

Which materials is this die for?

Free-cutting materials up to about 800 N/mm², especially unalloyed and low-alloy steels. For tougher alloys, consider HSSE/HSCo dies.

What starting diameter should I turn the blank to?

Turn the rod slightly below nominal (a few tenths under 5/16"). See the Outside Diameter chart: https://voelkel.com/media/be/66/89/1658304907/14_Technical_Information_Outside%20diameter.pdf

Which die holder fits?

Use a 25 mm die holder. Ensure square alignment and use cutting oil for best results.

What does BSW 5/16" x 18 mean?

BSW is British Standard Whitworth (BS 84) with a 55° flank angle. 5/16" is the nominal diameter and 18 is the number of threads per inch (TPI).

What does DIN 223 (DIN EN 22568) specify?

It defines dimensions and tolerances for round dies to ensure interchangeability and consistent thread quality.

Which materials is this die for?

Free-cutting materials up to about 800 N/mm², especially unalloyed and low-alloy steels. For tougher alloys, consider HSSE/HSCo dies.

What starting diameter should I turn the blank to?

Turn the rod slightly below nominal (a few tenths under 5/16"). See the Outside Diameter chart: https://voelkel.com/media/be/66/89/1658304907/14_Technical_Information_Outside%20diameter.pdf

Which die holder fits?

Use a 25 mm die holder. Ensure square alignment and use cutting oil for best results.

Circular steel die with multiple openings for accurate external threading on metal components.

BSW (Whitworth)

Round Die DIN 223 (DIN EN 22568) HSS - BSW 5/16 x 18

Name: VÖLKEL Round Die DIN 223 (DIN EN 22568) HSS-G - BSW 5/16 x 18
Brand: VÖLKEL
SKU: 22416
Price: 12.80 EUR
Availability: InStock

Item no. 22416

€12.80

in stock - more than 100 pieces available

VÖLKEL delivers exclusively to specialized dealers. Online you can buy VÖLKEL products here.

The prices are in Euro plus VAT and shipping, insurance and packaging costs.

Application

VÖLKEL Round Die DIN 223 (DIN EN 22568) HSS-G – BSW 5/16" x 18

The VÖLKEL HSS-G round die cuts precise Whitworth external threads (BSW) to BS 84 in size 5/16" x 18 TPI. Designed for general use in free-cutting materials up to 800 N/mm², it is ideal for unalloyed and low-alloy steels.

Application & Advantages

Clean, accurate external Whitworth threading (BSW)
HSS-G ground for sharp edges and stable cutting
For unalloyed/low-alloy steels and similar free-cutting materials
Manufactured to DIN 223 (DIN EN 22568) for consistency
Ø 25 × 9 mm – fits common die holders

BSW, DIN 223 & HSS-G Explained

BSW (British Standard Whitworth) uses a 55° profile with inch sizes and threads per inch (TPI). 5/16" x 18 is 5/16 in outside diameter with 18 TPI.

DIN 223 (DIN EN 22568) defines dimensions and requirements for round dies—for repeatable results and interchangeability.

HSS-G = ground high-speed steel: crisp cutting edges, smooth running, dependable tool life.

Step-by-Step Guide

Prepare: Turn the blank slightly under nominal and add a lead-in chamfer. See the Outside Diameter chart (PDF).
Mount: Fix the die in a 25 mm holder; check the cutting side orientation.
Align & lubricate: Clamp the work securely, keep the die square, apply cutting oil.
Cut: Apply steady torque with uniform feed; maintain axial alignment.
Inspect: Clean the thread; verify with a 5/16" BSW nut or gauge.

Technical Details

Thread type	Whitworth BSW (BS 84)
Standard	DIN 223 (DIN EN 22568)
Material	HSS-G
Nominal size	BSW 5/16" x 18 TPI
Outer diameter (Ø × H)	25 × 9 mm
EAN	4022835224167
Article number	22416

FAQ

Can I use the die on a machine?
Yes, with a suitable holder at low speeds. Keep alignment square and use cutting oil.

Which die holder do I need?
A holder for Ø 25 mm round dies.

What starting diameter should I turn?
Refer to the Outside Diameter chart (PDF) for recommended undersizes before threading.

Which materials suit HSS-G?
Free-cutting steels and non-abrasive materials. For tough/high-alloy steels, choose HSSE/HSCo.

Other sizes available?
Yes—VÖLKEL offers many thread forms and sizes across the range.

Need advice on thread sizes or tooling? Reach out via our contact form.

Additional information

Type of thread	Whitworth-Thread
Standard	DIN 223 (DIN EN 22568)
Form	solid version (Form B)
Material	HSS
Tolerance	medium
Size	BSW 5/16 x 18
Outer diameter	25.0 mm
EAN	4022835224167
Item number	22416
Thread standard	BS 84
Rec. Bolt diameter	7.76 mm