Sandvik UNF 1/4-28 Spiral Flute Tap – Premium Blind-Hole Tapping (DIN 2184-1)

Designed for precision threading in steels, stainless steels, and cast irons (PMK). The 45o spiral flute geometry ensures efficient chip evacuation in blind holes, delivering clean, accurate threads and reliable performance in CNC and manual machining.

Key Features & Benefits

Extended Tool Life – HSS-PM substrate with PVD FeN coating provides superior wear resistance.
Optimized Chip Evacuation – 45o spiral flutes remove chips smoothly from blind holes.
Production Ready – DIN 2184-1 shank standard with 3-flute design for strength and stability.
High Precision – Manufactured to UNF 2B tolerance for repeatable, in-spec threads.

Technical SpecificationsWhy Choose This Tool?

This Sandvik UNF 1/4-28 spiral flute tap combines a premium HSS-PM substrate with PVD FeN coating for maximum durability and precision. With 45o spiral flutes and optimized geometry for blind-hole tapping, it ensures reliable chip evacuation, accurate thread quality, and extended tool life in demanding production environments.

Specification	Metric	Imperial
Workpiece Material(s)	PMK
Thread Size	UNF 1/4-28	1/4-28
Thread Form	UNF 60o	UNF 60o
Thread Pitch	0.907 mm	28 TPI
Thread Diameter	6.35 mm	0.25 in
Tap Chamfer Length	1.95 mm	0.0767 in
Premachined Hole Diameter	5.50 mm	0.2165 in
Premachined Hole Type / Hole Type	Blind hole	Blind hole
Thread Tolerance Class	2B
Shank Standard	DIN 2184-1
Usable Length (LU)	30 mm	1.1811 in
Functional Length (LF)	80 mm	3.1496 in
Overall Length (OAL)	82 mm	3.2283 in
Neck Diameter	4.85 mm	0.1909 in
Flute Count	3
Flute Helix Angle	45o
Radial Rake Angle	13o
Threading Length	10 mm	0.3937 in
Threading Chamfer Type	C = 2-3xTP
Chip Breaker	XM
Grade	C145
Substrate	HSS-PM
Coating	PVD FeN
Coolant Entry / Exit	Without / None
Connection – Machine Side	Tap shank DIN-metric 7.00 × 5.50
Connection Diameter (Machine Side)	7.0 mm	0.2756 in
Connection Diameter Tolerance	h9
Weight	0.0234 kg	0.0516 lb
Maximum Regrinds	0
Release Date	02/25/2014
Release Pack ID	14.1	-

This product is sold by a third-party seller and they are responsible for their product, the content of their listing and any exchanges of return of their product.

All products sold by third-parties are subject to guarantees that cannot be excluded under the Consumer Guarantees Act.

Sandvik UNF 1/4-28 Spiral Flute Tap – Premium Blind-Hole Tapping (DIN 2184-1)

Key Features & Benefits

Extended Tool Life – HSS-PM substrate with PVD FeN coating provides superior wear resistance.
Optimized Chip Evacuation – 45o spiral flutes remove chips smoothly from blind holes.
Production Ready – DIN 2184-1 shank standard with 3-flute design for strength and stability.
High Precision – Manufactured to UNF 2B tolerance for repeatable, in-spec threads.

Technical SpecificationsWhy Choose This Tool?

Specification	Metric	Imperial
Workpiece Material(s)	PMK
Thread Size	UNF 1/4-28	1/4-28
Thread Form	UNF 60o	UNF 60o
Thread Pitch	0.907 mm	28 TPI
Thread Diameter	6.35 mm	0.25 in
Tap Chamfer Length	1.95 mm	0.0767 in
Premachined Hole Diameter	5.50 mm	0.2165 in
Premachined Hole Type / Hole Type	Blind hole	Blind hole
Thread Tolerance Class	2B
Shank Standard	DIN 2184-1
Usable Length (LU)	30 mm	1.1811 in
Functional Length (LF)	80 mm	3.1496 in
Overall Length (OAL)	82 mm	3.2283 in
Neck Diameter	4.85 mm	0.1909 in
Flute Count	3
Flute Helix Angle	45o
Radial Rake Angle	13o
Threading Length	10 mm	0.3937 in
Threading Chamfer Type	C = 2-3xTP
Chip Breaker	XM
Grade	C145
Substrate	HSS-PM
Coating	PVD FeN
Coolant Entry / Exit	Without / None
Connection – Machine Side	Tap shank DIN-metric 7.00 × 5.50
Connection Diameter (Machine Side)	7.0 mm	0.2756 in
Connection Diameter Tolerance	h9
Weight	0.0234 kg	0.0516 lb
Maximum Regrinds	0
Release Date	02/25/2014
Release Pack ID	14.1	-

This product is sold by a third-party seller and they are responsible for their product, the content of their listing and any exchanges of return of their product.

All products sold by third-parties are subject to guarantees that cannot be excluded under the Consumer Guarantees Act.

SANDVIK Sandvik HSS-PM Blue Spiral Flute PVD FeN coated Tap 1/4" UNF, DIN 2184-1 Short Body

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