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SP STI

Spiral Fluted Taps for Helical Coil Wire Screw Thread Inserts

Specification

■ On parts made from comparatively soft materials, helical E coil wire thread inserts are often used in order to strengthen internal screws and increase toughness. SP STI produces threads oversize enough to accommodate helical coil wire Recommended Tapping Speed depending on Materials thread inserts.

Brass Brass castings Bronze Wrought aluminum Aluminum alloy castings

TYPE：1

5〜155〜155〜155〜155〜15
(m/min)(m/min)(m/min)(m/min)(m/min)

Magnesium alloy die castings inc alloy castings

5〜15 5〜15

(m/min) (m/min) For icon explanation, refer to P.50

TYPE：2 TYPE：3

Segment：1C

SizeClassCodeChamferLℓℓnℓsDsKℓkNo. of Type
(inch)(inch)(inch)(inch)(inch)(inch)(inch)flutes

For Helical Coil Wire Screw Thread Inserts, for Unified Threads GH1 SUUN2E1NEB

STI No.2-56UNC 2P 2.205 0.354 0.709 1.28 0.141 0.11 0.187 2 1

GH2 SUUN2E2NEB GH1 SUUN4H1NEB

STI No.4-40UNC 2P 2.48 0.512 0.827 1.496 0.168 0.131 0.25 2 1

GH2 SUUN4H2NEB GH1 SUUN6J1NEB

STI No.6-32UNC 2P 2.756 0.551 0.945 1.654 0.194 0.131 0.25 3 1

GH2 SUUN6J2NEB GH1 SUUN8J1NEB

STI No.8-32UNC 2P 3.15 0.591 0.984 1.929 0.220 0.165 0.281 3 1

GH2 SUUN8J2NEB GH2 SUUNAM2NEB

STI No.10-24UNC 2P 3.15 0.591 1.181 1.713 0.255 0.191 0.312 3 1

GH3 SUUNAM3NEB GH2 SUUNAJ2NEB

STI No.10-32UNF 2P 3.15 0.591 1.181 1.713 0.255 0.191 0.312 3 1

GH3 SUUNAJ3NEB GH2 SUU04N2NEB

STI 1/4-20UNC 2P 3.543 0.748 1.378 1.831 0.318 0.238 0.375 3 2

GH3 SUU04N3NEB GH2 SUU04K2NEB

STI 1/4-28UNF 2P 3.543 0.748 1.378 1.831 0.318 0.238 0.375 3 2

GH3 SUU04K3NEB GH2 SUU05O2NEB

STI 5/16-18UNC 2P 3.937 0.906 1.535 2.067 0.381 0.286 0.437 3 2

GH3 SUU05O3NEB GH2 SUU05M2NEB

STI 5/16-24UNF 2P 3.937 0.906 1.535 2.028 0.381 0.286 0.437 3 2

GH3 SUU05M3NEB GH2 SUU06P2NEB

STI 3/8-16UNC 2P 4.331 1.024 - 2.205 0.367 0.275 0.437 3 3

GH3 SUU06P3NEB