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EX-SFT Spiral Fluted Tap
OSG Threading

EX-SFT Spiral Fluted Tap

Workpiece material (ISO)
P · SteelN · Non-ferrous

HSSE spiral fluted tap for blind-hole tapping in carbon steel, alloy steel, and non-ferrous metals, with continuous coil-form chip evacuation. Offered in Metric (M), Unified (U/UNC), and Whitworth (W) thread types, plus a left-hand (LH) variant.

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Features & uses

Engineered for performance

1

Blind-hole spiral flute

Spiral flutes lift chips up and out of the hole, suited to blind holes where chips have no path out the bottom.

2

Broad material coverage

Rated for carbon steel, alloy steel, and non-ferrous metals (copper, brass, aluminium, zinc die-cast, engineering plastic) with continuous coil-form chips.

3

HSSE substrate

Made from HSSE (cobalt-alloyed high-speed steel) for added heat and wear resistance.

4

Diameter-matched helix angle

A 35° helix below M52 and a 15° helix at M52 and above, matched to chip evacuation needs at each size.

Workpiece material

Material applicability

P

Steel

  • Low carbon steel C ≤ 0.25%
    Not marked
  • Medium carbon steel C 0.25%–0.45%
    ○ Suitable

    Catalogue mark: ○

  • High carbon steel C > 0.45%
    Not marked
  • Alloy steel SCM
    ○ Suitable

    Catalogue mark: ○

  • Cast steel SC
    Not marked
K

Cast iron

  • Cast iron FC
    Not marked
  • Ductile cast iron FCD
    ○ Suitable

    Catalogue mark: ○

N

Non-ferrous

  • Copper Cu
    ○ Suitable

    Catalogue mark: ○

  • Brass Bs
    ○ Suitable

    Catalogue mark: ○

  • Brass casting BsC
    ○ Suitable

    Catalogue mark: ○

  • Bronze PB
    ○ Suitable

    Catalogue mark: ○

  • Aluminum rolled AL
    ○ Suitable

    Catalogue mark: ○

  • Aluminum alloy casting AC,ADC
    ○ Suitable

    Catalogue mark: ○

  • Magnesium alloy casting MC
    ○ Suitable

    Catalogue mark: ○

  • Zinc alloy casting ZDC
    ○ Suitable

    Catalogue mark: ○

Source: Catalogue · OSG 2025-26 Work Material chart, visually reviewed for EX-SFT. · OSG 2025-26 catalogue Work Material chart

Specifications

Sizes & part numbers

ORDER NO.SIZEGRADEFLUTE LOALSHANKCOATING
18008 M1 × 0.25 · STD OH1 7 30 3 HSSE
18009 M1.1 × 0.25 · STD OH1 8 32 3 HSSE
18010 M1.2 × 0.25 · STD OH1 8 32 3 HSSE
18012 M1.4 × 0.3 · STD OH1 9 34 3 HSSE
18014 M1.6 × 0.35 · STD OH1 10 36 3 HSSE
18016 M1.7 × 0.35 · STD OH1 11 36 3 HSSE
18017 M1.7 × 0.35 · STD+1 OH2 11 36 3 HSSE
18018 M1.8 × 0.35 · STD OH1 11 36 3 HSSE
18021 M2 × 0.4 · STD OH1 12 40 3 HSSE
18022 M2 × 0.4 · STD+1 OH2 12 40 3 HSSE
18023 M2 × 0.4 · STD+2 OH3 12 40 3 HSSE
18024 M2 × 0.25 · STD OH1 12 40 3 HSSE
18025 M2.2 × 0.45 · STD OH1 13 42 3 HSSE
18026 M2.3 × 0.4 · STD OH1 13 42 3 HSSE
18027 M2.3 × 0.4 · STD+1 OH2 13 42 3 HSSE
18028 M2.3 × 0.4 · STD+2 OH3 13 42 3 HSSE
18030 M2.5 × 0.45 · STD OH1 14 44 3 HSSE
18031 M2.5 × 0.45 · STD+1 OH2 14 44 3 HSSE
18032 M2.5 × 0.45 · STD+2 OH3 14 44 3 HSSE
18033 M2.5 × 0.35 · STD OH1 14 44 3 HSSE
18034 M2.6 × 0.45 · STD OH1 14 44 3 HSSE
18035 M2.6 × 0.45 · STD+1 OH2 14 44 3 HSSE
18036 M2.6 × 0.45 · STD+2 OH3 14 44 3 HSSE
18037 M2.6 × 0.45 · STD+3 OH4 14 44 3 HSSE
18038 M2.6 × 0.35 · STD OH1 14 44 3 HSSE
18040 M3 × 0.6 · STD OH1 6 46 4 HSSE
18041 M3 × 0.6 · STD+1 OH2 6 46 4 HSSE
11544 M3 × 0.5 · STD OH2 6 46 4 HSSE
18045 M3 × 0.5 · STD+1 OH3 6 46 4 HSSE
19942 M3 × 0.5 · STD+2 OH4 6 46 4 HSSE
18046 M3 × 0.35 · STD OH1 6 46 4 HSSE
18510 M3 × 0.5-L · STD OH2 6 46 4 HSSE
18048 M3.5 × 0.6 · STD OH1 7.2 48 4 HSSE
18049 M3.5 × 0.6 · STD+1 OH2 7.2 48 4 HSSE
18050 M3.5 × 0.35 · STD OH1 7.2 48 4 HSSE
18053 M4 × 0.75 · STD OH2 8.4 52 5 HSSE
18054 M4 × 0.75 · STD+1 OH3 8.4 52 5 HSSE
11556 M4 × 0.7 · STD OH2 8.4 52 5 HSSE
18057 M4 × 0.7 · STD+1 OH3 8.4 52 5 HSSE
19946 M4 × 0.7 · STD+2 OH4 8.4 52 5 HSSE
18059 M4 × 0.5 · STD OH2 8.4 52 5 HSSE
18514 M4 × 0.7-L · STD OH2 8.4 52 5 HSSE
18062 M4.5 × 0.75 · STD OH2 9 55 5 HSSE
18068 M5 × 0.9 · STD OH2 9.6 60 5.5 HSSE
18069 M5 × 0.9 · STD+1 OH3 9.6 60 5.5 HSSE
11571 M5 × 0.8 · STD OH2 9.6 60 5.5 HSSE
18072 M5 × 0.8 · STD+1 OH3 9.6 60 5.5 HSSE
19950 M5 × 0.8 · STD+2 OH4 9.6 60 5.5 HSSE
18073 M5 × 0.75 · STD OH2 9.6 60 5.5 HSSE
18074 M5 × 0.5 · STD OH2 9.6 60 5.5 HSSE
18518 M5 × 0.8-L · STD OH2 9.6 60 5.5 HSSE
18077 M5.5 × 0.9 · STD OH2 10.8 60 5.5 HSSE
18079 M5.5 × 0.5 · STD OH2 10.8 60 5.5 HSSE
11583 M6 × 1 · STD OH2 12 62 6 HSSE
18084 M6 × 1 · STD+1 OH3 12 62 6 HSSE
19954 M6 × 1 · STD+2 OH4 12 62 6 HSSE
18086 M6 × 0.75 · STD OH2 12 62 6 HSSE
18087 M6 × 0.75 · STD+1 OH3 12 62 6 HSSE
18088 M6 × 0.5 · STD OH2 12 62 6 HSSE
18522 M6 × 1-L · STD OH2 12 62 6 HSSE
18092 M7 × 1 · STD OH2 12 65 6.2 HSSE
18094 M7 × 0.75 · STD OH2 12 65 6.2 HSSE
18096 M7 × 0.5 · STD OH2 12 65 6.2 HSSE
11601 M8 × 1.25 · STD OH3 15 70 6.2 HSSE
18102 M8 × 1.25 · STD+1 OH4 15 70 6.2 HSSE
19958 M8 × 1.25 · STD+2 OH5 15 70 6.2 HSSE
18104 M8 × 1 · STD OH2 15 70 6.2 HSSE
18105 M8 × 1 · STD+1 OH3 15 70 6.2 HSSE
18107 M8 × 0.75 · STD OH2 15 70 6.2 HSSE
18110 M8 × 0.5 · STD OH2 15 70 6.2 HSSE
18526 M8 × 1.25-L · STD OH3 15 70 6.2 HSSE
18113 M9 × 1.25 · STD OH3 15 72 7 HSSE
18115 M9 × 1 · STD OH2 15 72 7 HSSE
18119 M9 × 0.5 · STD OH2 15 72 7 HSSE
11621 M10 × 1.5 · STD OH3 18 75 7 HSSE
18122 M10 × 1.5 · STD+1 OH4 18 75 7 HSSE
19962 M10 × 1.5 · STD+2 OH5 18 75 7 HSSE
11624 M10 × 1.25 · STD OH3 18 75 7 HSSE
18125 M10 × 1.25 · STD+1 OH4 18 75 7 HSSE
18127 M10 × 1 · STD OH2 18 75 7 HSSE
18128 M10 × 1 · STD+1 OH3 18 75 7 HSSE
18131 M10 × 0.75 · STD OH2 18 75 7 HSSE
18530 M10 × 1.5-L · STD OH3 18 75 7 HSSE
18532 M10 × 1.25-L · STD OH3 18 75 7 HSSE
18135 M11 × 1.5 · STD OH3 18 80 8 HSSE
18138 M11 × 1.25 · STD OH3 18 80 8 HSSE
18141 M11 × 1 · STD OH2 18 80 8 HSSE
18144 M11 × 0.75 · STD OH2 18 80 8 HSSE
11650 M12 × 1.75 · STD OH3 21 82 8.5 HSSE
18151 M12 × 1.75 · STD+1 OH4 21 82 8.5 HSSE
19968 M12 × 1.75 · STD+2 OH5 21 82 8.5 HSSE
11653 M12 × 1.5 · STD OH3 21 82 8.5 HSSE
18154 M12 × 1.5 · STD+1 OH4 21 82 8.5 HSSE
11656 M12 × 1.25 · STD OH3 21 82 8.5 HSSE
18157 M12 × 1.25 · STD+1 OH4 21 82 8.5 HSSE
18159 M12 × 1 · STD OH2 21 82 8.5 HSSE
18160 M12 × 1 · STD+1 OH3 21 82 8.5 HSSE
18163 M12 × 0.75 · STD OH2 21 82 8.5 HSSE
18166 M12 × 0.5 · STD OH2 21 82 8.5 HSSE
18536 M12 × 1.75-L · STD OH3 21 82 8.5 HSSE
18538 M12 × 1.5-L · STD OH3 21 82 8.5 HSSE
18540 M12 × 1.25-L · STD OH3 21 82 8.5 HSSE
18168 M13 × 1.75 · STD OH2 30 88 9.5 HSSE
18171 M13 × 1.5 · STD OH2 30 88 9.5 HSSE
18175 M13 × 1 · STD OH2 30 88 9.5 HSSE
11680 M13 × 1 · STD OH2 30 88 9.5 HSSE
18181 M14 × 2 · STD+1 OH3 30 88 10.5 HSSE
11683 M14 × 1.5 · STD OH2 30 88 10.5 HSSE
18184 M14 × 1.5 · STD+1 OH3 30 88 10.5 HSSE
18186 M14 × 1.25 · STD OH2 30 88 10.5 HSSE
18187 M14 × 1 · STD OH2 30 88 10.5 HSSE
18544 M14 × 2-L · STD OH2 30 88 10.5 HSSE
18546 M14 × 1.5-L · STD OH2 30 88 10.5 HSSE
18193 M15 × 2 · STD OH2 32 95 10.5 HSSE
18196 M15 × 1.5 · STD OH2 32 95 10.5 HSSE
18199 M15 × 1 · STD OH2 32 95 10.5 HSSE
11705 M16 × 2 · STD OH2 32 95 12.5 HSSE
18206 M16 × 2 · STD+1 OH3 32 95 12.5 HSSE
11708 M16 × 1.5 · STD OH2 32 95 12.5 HSSE
18209 M16 × 1.5 · STD+1 OH3 32 95 12.5 HSSE
18211 M16 × 1 · STD OH2 32 95 12.5 HSSE
18550 M16 × 2-L · STD OH2 32 95 12.5 HSSE
18552 M16 × 1.5-L · STD OH2 32 95 12.5 HSSE
18221 M17 × 2 · STD OH3 37 100 13 HSSE
18224 M17 × 1.5 · STD OH2 37 100 13 HSSE
18227 M17 × 1 · STD OH2 37 100 13 HSSE
11730 M18 × 2.5 · STD OH3 37 100 14 HSSE
18231 M18 × 2.5 · STD+1 OH4 37 100 14 HSSE
18233 M18 × 2 · STD OH3 37 100 14 HSSE
11735 M18 × 1.5 · STD OH2 37 100 14 HSSE
18236 M18 × 1.5 · STD+1 OH3 37 100 14 HSSE
18238 M18 × 1 · STD OH2 37 100 14 HSSE
18556 M18 × 2.5-L · STD OH3 37 100 14 HSSE
18558 M18 × 1.5-L · STD OH2 37 100 14 HSSE
18248 M19 × 2.5 · STD OH3 37 105 14 HSSE
18252 M19 × 1.5 · STD OH2 37 105 14 HSSE
18254 M19 × 1 · STD OH2 37 105 14 HSSE
11757 M20 × 2.5 · STD OH3 37 105 15 HSSE
18258 M20 × 2.5 · STD+1 OH4 37 105 15 HSSE
18260 M20 × 2 · STD OH3 37 105 15 HSSE
11762 M20 × 1.5 · STD OH2 37 105 15 HSSE
18263 M20 × 1.5 · STD+1 OH3 37 105 15 HSSE
18266 M20 × 1 · STD OH2 37 105 15 HSSE
18562 M20 × 2.5-L · STD OH3 37 105 15 HSSE
18564 M20 × 1.5-L · STD OH2 37 105 15 HSSE
11772 M22 × 2.5 · STD OH3 38 115 17 HSSE
18273 M22 × 2.5 · STD+1 OH4 38 115 17 HSSE
18275 M22 × 2 · STD OH3 38 115 17 HSSE
11777 M22 × 1.5 · STD OH2 38 115 17 HSSE
18278 M22 × 1.5 · STD+1 OH3 38 115 17 HSSE
18282 M22 × 1 · STD OH2 38 115 17 HSSE
18568 M22 × 2.5-L · STD OH3 38 115 17 HSSE
18570 M22 × 1.5-L · STD OH2 38 115 17 HSSE
18287 M23 × 2.5 · STD OH3 45 120 18 HSSE
18290 M23 × 2 · STD OH3 45 120 18 HSSE
11799 M24 × 3 · STD OH3 45 120 19 HSSE
18300 M24 × 3 · STD+1 OH4 45 120 19 HSSE
18302 M24 × 2 · STD+1 OH3 45 120 19 HSSE
11804 M24 × 2 · STD OH2 45 120 19 HSSE
18305 M24 × 1.5 · STD+1 OH3 45 120 19 HSSE
18308 M24 × 1 · STD+1 OH2 45 120 19 HSSE
18573 M24 × 3-L · STD OH3 45 120 19 HSSE
18576 M24 × 1.5-L · STD OH2 45 120 19 HSSE
18311 M25 × 3 · STD+1 OH2 45 130 19 HSSE
18314 M25 × 2 · STD OH3 45 130 19 HSSE
18316 M25 × 1.5 · STD OH2 45 130 19 HSSE
18323 M26 × 3 · STD OH2 45 130 20 HSSE
18325 M26 × 2 · STD OH3 45 130 20 HSSE
18328 M26 × 1.5 · STD OH2 45 130 20 HSSE
18338 M26 × 1.5 · STD OH3 45 130 20 HSSE
18339 M27 × 3 · STD+1 OH4 45 130 20 HSSE
18341 M27 × 2 · STD OH3 45 130 20 HSSE
18343 M27 × 2 · STD OH2 45 130 20 HSSE
18344 M27 × 1.5 · STD+1 OH3 45 130 20 HSSE
18346 M27 × 1 · STD+1 OH2 45 130 20 HSSE
18580 M27 × 3-L · STD OH3 45 130 20 HSSE
18582 M27 × 1.5-L · STD OH2 45 130 20 HSSE
18350 M28 × 3 · STD OH2 48 135 21 HSSE
18353 M28 × 2 · STD OH3 48 135 21 HSSE
18355 M28 × 1.5 · STD OH2 48 135 21 HSSE
18362 M28 × 1.5 · STD OH3 48 135 21 HSSE
18363 M30 × 3.5 · STD+1 OH4 48 135 23 HSSE
18365 M30 × 3 · STD OH3 48 135 23 HSSE
18368 M30 × 2 · STD OH3 48 135 23 HSSE
18370 M30 × 2 · STD OH2 48 135 23 HSSE
18371 M30 × 1.5 · STD+1 OH3 48 135 23 HSSE
18586 M30 × 3.5-L · STD OH3 48 135 23 HSSE
18588 M30 × 1.5-L · STD OH2 48 135 23 HSSE
18383 M32 × 1.5 · STD+1 OH3 37 110 24 HSSE
18395 M33 × 2 · STD+1 OH3 37 110 25 HSSE
18401 M33 × 1.5 · STD+1 OH3 37 110 25 HSSE
18389 M33 × 3.5 · STD+1 OH3 51 145 25 HSSE
18413 M35 × 1.5 · STD+1 OH3 39 110 26 HSSE
18426 M36 × 2 · STD OH3 39 110 28 HSSE
18431 M36 × 1.5 · STD OH3 39 110 28 HSSE
18420 M36 × 4 · STD+1 OH4 57 155 28 HSSE
18424 M36 × 3 · STD OH4 57 155 28 HSSE
18443 M39 × 4 · STD OH4 60 165 30 HSSE
18467 M42 × 2 · STD OH3 39 120 32 HSSE
18470 M42 × 1.5 · STD OH3 39 120 32 HSSE
18459 M42 × 4.5 · STD OH4 60 175 32 HSSE
18463 M42 × 3 · STD OH4 60 175 32 HSSE
18485 M45 × 2 · STD OH3 45 120 35 HSSE
18488 M45 × 1.5 · STD OH3 45 120 35 HSSE
18479 M45 × 4.5 · STD OH4 67 180 35 HSSE
18482 M45 × 3 · STD OH4 67 180 35 HSSE
18504 M48 × 2 · STD OH3 45 125 38 HSSE
18506 M48 × 1.5 · STD OH3 45 125 38 HSSE
18499 M48 × 5 · STD OH4 67 185 38 HSSE
18502 M48 × 3 · STD OH4 67 185 38 HSSE
19750 M52 × 5 · STD OH4 70 195 42 HSSE
19763 M56 × 5.5 · STD OH4 70 205 44 HSSE
18821 No.4-40 UNC · STD OH1 7.7 44 3 HSSE
18824 No.4-48 UNF · STD OH1 7.7 44 3 HSSE
18827 No.5-40 UNC · STD OH1 7.7 46 4 HSSE
18830 No.5-44 UNF · STD OH1 7.7 46 4 HSSE
18833 No.6-32 UNC · STD OH2 9.6 48 4 HSSE
18836 No.6-40 UNF · STD OH1 9.6 48 4 HSSE
18840 No.8-32 UNC · STD OH1 9.6 52 5 HSSE
18842 No.8-36 UNF · STD OH1 9.6 52 5 HSSE
18846 No.10-24 UNC · STD OH2 12.7 60 5.5 HSSE
18849 No.10-32 UNF · STD OH2 12.7 60 5.5 HSSE
18852 No.12-24 UNC · STD OH2 12.7 60 5.5 HSSE
18855 No.12-28 UNF · STD OH2 12.7 60 5.5 HSSE
18858 1/4-20 UNC · STD OH3 15.3 62 6 HSSE
18861 1/4-28 UNF · STD OH2 15.3 62 6 HSSE
18867 5/16-18 UNC · STD OH3 17 70 6.1 HSSE
18870 5/16-24 UNF · STD OH2 17 70 6.1 HSSE
18876 3/8-16 UNC · STD OH3 19 75 7 HSSE
18882 3/8-24 UNF · STD OH2 19 75 7 HSSE
18891 7/16-14 UNC · STD OH2 22 80 8 HSSE
18894 7/16-20 UNF · STD OH3 22 80 8 HSSE
18900 1/2-13 UNC · STD OH3 23 85 9 HSSE
18906 1/2-20 UNF · STD OH3 23 85 9 HSSE
18912 9/16-12 UNC · STD OH2 30 90 10.5 HSSE
18915 9/16-18 UNF · STD OH2 30 90 10.5 HSSE
18919 5/8-11 UNC · STD OH3 32 95 12 HSSE
18921 5/8-18 UNF · STD OH2 32 95 12 HSSE
18925 3/4-10 UNC · STD OH3 37 105 14 HSSE
18927 3/4-16 UNF · STD OH2 37 105 14 HSSE
18931 7/8-9 UNC · STD OH3 38 115 17 HSSE
18933 7/8-14 UNF · STD OH2 38 115 17 HSSE
18937 1-8 UNC · STD OH3 45 125 20 HSSE
18940 1-12 UNF · STD OH3 45 125 20 HSSE
18943 1-14 UNS · STD OH3 45 125 20 HSSE
18947 1 1/8-12 UNF · STD OH3 37 105 22 HSSE
18945 1 1/8-7 UNC · STD OH4 48 135 22 HSSE
18955 1 1/4-12 UNF · STD OH3 37 105 24 HSSE
18952 1 1/4-7 UNC · STD OH4 51 145 24 HSSE
18960 1 3/8-12 UNF · STD OH3 39 110 26 HSSE
18958 1 3/8-6 UNC · STD OH4 57 155 26 HSSE
18966 1 1/2-12 UNF · STD OH3 39 115 30 HSSE
18964 1 1/2-6 UNC · STD OH4 60 160 30 HSSE
18972 1 3/4-12 UN · STD OH3 45 120 35 HSSE
18970 1 3/4-5 UNC · STD OH4 67 175 35 HSSE
18704 W 1/8-40 · STD OH1 11 46 4 HSSE
18707 W 3/16-24 · STD OH1 16 60 5.5 HSSE
18710 W 1/4-20 · STD OH2 19 62 6 HSSE
18714 W 5/16-18 · STD OH2 22 70 6.1 HSSE
19704 W 5/16-18-L · STD OH2 22 70 6.1 HSSE
18718 W 3/8-16 · STD OH2 24 75 7 HSSE
19705 W 3/8-16-L · STD OH2 24 75 7 HSSE
18722 W 7/16-14 · STD OH2 25 80 8 HSSE
18726 W 1/2-12 · STD OH2 29 85 9 HSSE
18730 W 5/8-11 · STD OH2 32 95 12 HSSE
19709 W 5/8-11-L · STD OH2 32 95 12 HSSE
18734 W 3/4-10 · STD OH2 37 105 14 HSSE
19710 W 3/4-10-L · STD OH2 37 105 14 HSSE
18738 W 7/8-9 · STD OH2 38 115 17 HSSE
19711 W 7/8-9-L · STD OH2 38 115 17 HSSE
18742 W 1-8 · STD OH3 45 125 20 HSSE
19712 W 1-8-L · STD OH3 45 125 20 HSSE
18746 W 1 1/8-7 · STD OH3 48 135 22 HSSE
18750 W 1 1/4-7 · STD OH3 51 145 24 HSSE
18758 W 1 1/2-6 · STD OH3 60 160 30 HSSE
19901 SM 3/32-56 · STD OH1 13 42 3 HSSE
19903 SM 1/8-44 · STD OH1 11 46 4 HSSE
19905 SM 9/64-40 · STD OH1 13 48 4 HSSE
19907 SM 11/64-40 · STD OH2 13 55 5 HSSE
19910 SM 3/16-28 · STD OH2 16 60 5.5 HSSE
19911 SM 3/16-32 · STD OH2 16 60 5.5 HSSE
19915 SM 15/64-28 · STD OH2 19 62 6 HSSE
19917 SM 1/4-24 · STD OH2 19 62 6 HSSE
19920 SM 1/4-40 · STD OH2 19 62 6 HSSE
19921 SM 9/32-20 · STD OH2 22 65 6.5 HSSE
19922 SM 9/32-28 · STD OH2 22 65 6.5 HSSE
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