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ANBWCOS-SFT-UNCHSS-E Oversize Spiral Flute Tap American OS-SFTSold0pcsThe OS-SFT is an oversize tap made of cobalt high-speed steel (HSS-E) — oversized thread to allow for plating thickness or to compensate for material shrinkage after tapping. It comes in 20 sizes across UNC and UNF (thread dia #4~#10). Supplied uncoated (bright finish). It handles carbon and alloy steel, stainless steel, cast iron, non-ferrous metals such as aluminium and copper, with workpiece hardness up to HRC40. Typical applications: Unified (UN) blind-hole tapping before plating or zinc coating; the thread is cut slightly oversize to allow for the coating thickness, so the screw still fits after finishing. This is the spiral flute version, lifting chips toward the shank. In the same H.T.D family: the oversize spiral point OS-POT (for through holes, also 20 sizes), the metric OS-SFT-M and the Whitworth OS-SFT-W; this series covers UNC #4~#10 and UNF #10, every size in four oversize grades: 0.03, 0.05, 0.07 and 0.1mm. #10 comes in both UNC and UNF; which one? Follow the thread on the drawing; choose the oversize by coating thickness, four grades from 0.03 to 0.1mm. Can it be used for through holes? Yes, but for high-volume through-hole work use the oversize spiral point OS-POT.
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Cutting ToolsTapOversize Tap
HSS-E Oversize Spiral Flute Tap American OS-SFT
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HSS-E Oversize Spiral Flute Tap American OS-SFT

The OS-SFT is an oversize tap made of cobalt high-speed steel (HSS-E) — oversized thread to allow for plating thickness or to compensate for material shrinkage after tapping. It comes in 20 sizes across UNC and UNF (thread dia #4~#10).

Specifications (20 items)

Part No.StandardDia.Oversize
ANBWCOS-SFT-UNC_4+3UNC#40.03
ANBWCOS-SFT-UNC_4+5UNC#40.05
ANBWCOS-SFT-UNC_4+7UNC#40.07
ANBWCOS-SFT-UNC_4+10UNC#40.1
ANBWCOS-SFT-UNC_6+3UNC#60.03
ANBWCOS-SFT-UNC_6+5UNC#60.05
ANBWCOS-SFT-UNC_6+7UNC#60.07
ANBWCOS-SFT-UNC_6+10UNC#60.1
ANBWCOS-SFT-UNC_8+3UNC#80.03
ANBWCOS-SFT-UNC_8+5UNC#80.05
ANBWCOS-SFT-UNC_8+7UNC#80.07
ANBWCOS-SFT-UNC_8+10UNC#80.1
ANBWCOS-SFT-UNC_10+3UNC#100.03
ANBWCOS-SFT-UNC_10+5UNC#100.05
ANBWCOS-SFT-UNC_10+7UNC#100.07
ANBWCOS-SFT-UNC_10+10UNC#100.1
ANBWCOS-SFT-UNF_10+3UNF#100.03
ANBWCOS-SFT-UNF_10+5UNF#100.05
ANBWCOS-SFT-UNF_10+7UNF#100.07
ANBWCOS-SFT-UNF_10+10UNF#100.1

Specification Range

Diameter#4~#10

Product Description

The OS-SFT is an oversize tap made of cobalt high-speed steel (HSS-E) — oversized thread to allow for plating thickness or to compensate for material shrinkage after tapping. It comes in 20 sizes across UNC and UNF (thread dia #4~#10). Supplied uncoated (bright finish). It handles carbon and alloy steel, stainless steel, cast iron, non-ferrous metals such as aluminium and copper, with workpiece hardness up to HRC40. Typical applications: Unified (UN) blind-hole tapping before plating or zinc coating; the thread is cut slightly oversize to allow for the coating thickness, so the screw still fits after finishing. This is the spiral flute version, lifting chips toward the shank. In the same H.T.D family: the oversize spiral point OS-POT (for through holes, also 20 sizes), the metric OS-SFT-M and the Whitworth OS-SFT-W; this series covers UNC #4~#10 and UNF #10, every size in four oversize grades: 0.03, 0.05, 0.07 and 0.1mm. #10 comes in both UNC and UNF; which one? Follow the thread on the drawing; choose the oversize by coating thickness, four grades from 0.03 to 0.1mm. Can it be used for through holes? Yes, but for high-volume through-hole work use the oversize spiral point OS-POT.

Workpiece Materials & Hardness

  • Steel (P)
  • Stainless steel (M)
  • Cast iron (K)
  • Non-ferrous metals (N)

Max. workpiece hardness HRC40

Related Resources

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