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.

BrassBrass castingsBronzeWrought aluminumAluminum 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

SizeClassCodeChamfer L (inch)ℓ (inch)ℓn (inch)ℓs (inch)Ds (inch)K (inch)ℓk (inch)No. of flutesType
For Helical Coil Wire S icrew Thr iead Inserts, for iUnified Ti hreads
GH1SUUN2E1NEB
STI No.2-56UNCGH2SUUN2E2NEB2P2.2050.3540.7091.280.1410.110.18721
STI No.4-40UNCGH1 GH2SUUN4H1NEB SUUN4H2NEB2P2.480.5120.8271.4960.1680.1310.2521
STI No.6-32UNCGH1 GH2SUUN6J1NEB SUUN6J2NEB2P2.7560.5510.9451.6540.1940.1310.2531
STI No.8-32UNCGH1 GH2SUUN8J1NEB SUUN8J2NEB2P3.150.5910.9841.9290.2200.1650.28131
STI No.10-24UNCGH2 GH3SUUNAM2NEB SUUNAM3NEB2P3.150.5911.1811.7130.2550.1910.31231
STI No.10-32UNFGH2 GH3SUUNAJ2NEB SUUNAJ3NEB2P3.150.5911.1811.7130.2550.1910.31231
STI 1/4-20UNCGH2 GH3SUU04N2NEB SUU04N3NEB2P3.5430.7481.3781.8310.3180.2380.37532
STI 1/4-28UNFGH2 GH3SUU04K2NEB SUU04K3NEB2P3.5430.7481.3781.8310.3180.2380.37532
STI 5/16-18UNCGH2 GH3SUU05O2NEB SUU05O3NEB2P3.9370.9061.5352.0670.3810.2860.43732
STI 5/16-24UNFGH2 GH3SUU05M2NEB SUU05M3NEB2P3.9370.9061.5352.0280.3810.2860.43732
STI 3/8-16UNCGH2 GH3SUU06P2NEB SUU06P3NEB2P4.3311.024-2.2050.3670.2750.43733