Sandvik 1/4-20 UNC Spiral Flute Tap – Premium Blind-Hole Tapping (DIN 2184-1)

Designed for high-performance CNC and conventional machining. The spiral flute geometry (45o helix) actively lifts chips out of the hole, ensuring smooth thread cutting and preventing chip congestion in blind holes. Optimized for steels, stainless, and cast irons (PMK).

Key Features & Benefits

Extended Tool Life – HSS-PM substrate with PVD FeN coating provides durability and wear resistance.
Superior Chip Control – 45o spiral flute design pulls chips upward, ensuring reliable performance in blind holes.
Production Ready – DIN 2184-1 standard shank with 3-flute configuration balances rigidity with chip evacuation.
Consistent Accuracy – Manufactured to UNC 2B tolerance class for precise and repeatable threading.

Technical SpecificationsWhy Choose This Tool?

This Sandvik spiral flute tap leverages HSS-PM substrate, a durable PVD FeN coating, and a 45o spiral helix with C-chamfer to deliver long tool life, high-quality threads, and reliable chip evacuation in blind-hole applications-ideal for demanding CNC and manual production environments.

Specification	Metric	Imperial
Workpiece Material(s)	PMK
Thread Size	UNC 1/4-20	1/4-20
Thread Form	UNC 60o	UNC 60o
Thread Pitch	1.27 mm (equiv.)	20 TPI
Thread Diameter	6.35 mm	0.2500 in
Tap Chamfer Length	2.6679 mm	0.1051 in
Premachined Hole Diameter	5.1 mm	0.2008 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	0.0232 kg	0.0511 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 or returns of their product.

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

Sandvik 1/4-20 UNC Spiral Flute Tap – Premium Blind-Hole Tapping (DIN 2184-1)

Key Features & Benefits

Extended Tool Life – HSS-PM substrate with PVD FeN coating provides durability and wear resistance.
Superior Chip Control – 45o spiral flute design pulls chips upward, ensuring reliable performance in blind holes.
Production Ready – DIN 2184-1 standard shank with 3-flute configuration balances rigidity with chip evacuation.
Consistent Accuracy – Manufactured to UNC 2B tolerance class for precise and repeatable threading.

Technical SpecificationsWhy Choose This Tool?

Specification	Metric	Imperial
Workpiece Material(s)	PMK
Thread Size	UNC 1/4-20	1/4-20
Thread Form	UNC 60o	UNC 60o
Thread Pitch	1.27 mm (equiv.)	20 TPI
Thread Diameter	6.35 mm	0.2500 in
Tap Chamfer Length	2.6679 mm	0.1051 in
Premachined Hole Diameter	5.1 mm	0.2008 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	0.0232 kg	0.0511 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 or returns 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" UNC, DIN 2184-1 Short Body

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