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Product Specifications:
| Item | Thread Forming Tap |
| 55% Thread Drill Size | 6 mm |
| 65% Thread Drill Size | 15/64" |
| 75% Thread Drill Size | 5.9 mm |
| Extended Neck | Yes |
| Finish | Bright |
| Fits Class | Class 2B |
| Material Grade - Machining | Grade FTGP TN |
| Number Of Flutes | 0 |
| Overall Length | 2 1/2" |
| Primary Material Application | Aluminum, Brass, Bronze, Copper, Steel |
| Primary Material Application Iso Code | N, P |
| Shank Dia. | 1/4" |
| Shank Length | 1 1/2" |
| Square Size | 0.191" |
| Standards | Uscti Table 302A |
| Tap Chamfer | Bottoming |
| Tap Finish | Bright |
| Tap Material | High Speed Steel |
| Tap Style | Thread Forming |
| Tap Type | Thread Forming |
| Thread Direction | Right Hand |
| Thread Length | 5/8" |
| Thread Limit | H4 |
| Thread Limit/class Of Fit | H4, 2B |
| Thread Size | 1/4"-28 |
| Thread Standard | Fine |
| Threads Per Inch | 28 |
Shipping Info:
| Ship height (cm) | 1 |
| Ship length (cm) | 9 |
| Ship width (cm) | 1.2 |
| Country of Origin | US |
Product Variants
| Product | Model | Thread Length | Overall Length | Thread Limit | 75% Thread Drill Size | Thread Size | Tap Finish | Tap Chamfer | Thread Standard | Price | |
|---|---|---|---|---|---|---|---|---|---|---|---|
![]() |
289392 | 1/2" | 2 3/8" | H6 | 4.27 mm | #10-24 | Bright | Bottoming | Coarse | €33.83 | |
![]() |
289384 | 1/2" | 2 3/8" | H6 | 4.27 mm | #10-24 | Bright | Plug | Coarse | €34.45 | |
![]() |
289426 | 1/2" | 2 3/8" | H4 | 4.4 mm | #10-32 | Bright | Plug | Fine | €33.32 | |
![]() |
289434 | 1/2" | 2 3/8" | H4 | 4.4 mm | #10-32 | Bright | Bottoming | Fine | €33.52 | |
![]() |
330215 | 7/16" | 1 3/4" | H2 | 1.95 mm | #2-56 | Bright | Bottoming | Coarse | €47.03 | |
![]() |
289004 | 5/16" | 1 7/8" | H3 | 2.52 mm | #4-40 | Bright | Plug | Coarse | €40.63 | |
![]() |
289012 | 5/16" | 1 7/8" | H3 | 2.52 mm | #4-40 | Bright | Bottoming | Coarse | €40.63 |
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Contact us
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We're available Monday through Friday, from 07:30 until 17:00.
GREENFIELD THREADING 289590 FTGP Thread Forming Tap, High Speed Steel, Bright, 1/4-28 Thread Size
€35.23 /unit


