What does G (BSP) mean?

G (BSP or BSPP) refers to a parallel British Standard Pipe thread (DIN ISO 228). It is not self-sealing – sealing is achieved with O-rings, flat gaskets, or sealant.

What is Form C according to DIN 5156?

Form C designates a short lead for cutting blind holes to maximum thread depth in confined spaces.

What are the benefits of TIN-coating?

The titanium nitride (TIN) coating increases wear resistance, reduces friction, and enables higher cutting speeds with stable performance.

For which materials is this tap suitable?

For non-alloyed and low-alloyed steels and other non-abrasive materials up to 900 N/mm².

How is sealing achieved with G (BSP) threads?

G (BSPP) threads are parallel and not self-sealing. Sealing must be achieved through O-rings, gaskets, or thread sealants.

What does G (BSP) mean?

G (BSP or BSPP) refers to a parallel British Standard Pipe thread (DIN ISO 228). It is not self-sealing – sealing is achieved with O-rings, flat gaskets, or sealant.

What is Form C according to DIN 5156?

Form C designates a short lead for cutting blind holes to maximum thread depth in confined spaces.

What are the benefits of TIN-coating?

The titanium nitride (TIN) coating increases wear resistance, reduces friction, and enables higher cutting speeds with stable performance.

For which materials is this tap suitable?

For non-alloyed and low-alloyed steels and other non-abrasive materials up to 900 N/mm².

How is sealing achieved with G (BSP) threads?

G (BSPP) threads are parallel and not self-sealing. Sealing must be achieved through O-rings, gaskets, or thread sealants.

Precision VÖLKEL machine tap DIN 5156 Form C, HSSE with TiN coating for durable and accurate cutting of G (BSP) pipe threads.

Technical drawing of a VÖLKEL thread tap with labeled diameters and lengths.

A technical drawing shows a tap with the label “2–3 threads” indicating the distance of 2–3 threads.

G (BSP) Pipe-thread

Machine Tap DIN 5156 Form C HSSE TIN - G (BSP) 1/8 x 28

Name: VÖLKEL Machine Tap DIN 5156 Form C HSSE TIN – G (BSP) 1/8 × 28
Brand: VÖLKEL
SKU: 78413
Price: 23.30 EUR
Availability: InStock

Item no. 78413

€23.30

in stock - more than 10 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

Machine Tap DIN 5156 Form C HSSE TIN – G (BSP) 1/8 × 28

VÖLKEL Machine Tap DIN 5156 Form C HSSE TIN – G (BSP) 1/8 × 28

This precision machine tap is designed for G (BSPP) parallel pipe threads according to DIN ISO 228. The Form C short lead allows maximum thread depth in blind holes, while the TIN-coating ensures long tool life, superior surface quality, and reduced friction. Suitable for non-alloyed and low-alloyed steels up to 900 N/mm² and ideal for professional and industrial use.

Application & Benefits

G (BSPP) parallel thread – not self-sealing
Form C (short lead) for blind holes and maximum thread depth
TIN-coating for high wear resistance and low friction
Higher cutting speeds possible with stable setup
For non-alloyed and low-alloyed steels up to 900 N/mm²

Scope of Delivery

1× Machine tap HSSE TIN – G (BSP) 1/8 × 28, DIN 5156, Form C

Matching holders, lubricants and thread gauges available separately.

Technical Details

Thread Type	G (BSPP) parallel pipe thread, DIN ISO 228 (non-sealing)
Standard	DIN 5156
Form	Form C (short lead, for blind holes)
Material	HSSE, TIN-coated
Nominal Size	G 1/8 × 28
Overall Length (L1)	90 mm
Thread Length (L2)	20 mm
Shank Diameter (D2)	7 mm
Drive Square	5.5 mm
EAN	4022835784135
Article Number	78413

Step-by-Step Instructions

Drill the pilot hole: Drill to the correct core diameter and chamfer slightly.
Clamp and align: Secure the workpiece and align the spindle perpendicularly.
Lubricate: Apply cutting oil generously; reapply during cutting if needed.
Tap the thread: Maintain constant rotation and feed. Do not reverse to break chips; instead, use tapping cycles for chip evacuation.
Clean and inspect: Deburr and check the thread using the correct gauge or test plug.

FAQ

Is G (BSP) the same as BSPT?
No. G (BSPP) is parallel, while BSPT (R/Rc) is tapered and seals via flank contact.

When should I choose Form C?
Form C is ideal for blind holes where you need maximum depth; for through holes, use Form B.

What cutting parameters are recommended?
Use moderate speeds and feeds with generous lubrication; TIN allows slightly higher values with stable setups.

How can I verify thread quality?
Use appropriate GO/NO-GO gauges or thread plugs for G (BSP) sizes.

Do I need sealing compounds?
Yes, since G (BSPP) is not self-sealing, use O-rings, gaskets, or thread sealants for leak-tight joints.

Need more info about thread standards or accessories? Contact us via the contact form.

Additional information

Type of thread	Pipe thread
Standard	DIN 5156
Form	Form C
Material	HSSE
Tolerance	medium
Size	G (BSP) 1/8 x 28
Overall length (L1)	90 mm
Thread length (L2)	20 mm
Core hole diameter (D1)	8.8 mm
Shank diameter (D2)	7.0 mm
Drive connector	5.5 mm
EAN	4022835784135
Item number	78413
Type of flute	straight fluted
Application	for blind holes
Thread standard	DIN ISO 228
Coating	TIN