Общий каталог Yamawa 2022 - 2023 - страница 676

⑦ Special Thread Taps / Simple Inspection Tools Overall length L Thread length ℓ Thread + Neck length ℓn Shank length ℓs Shank dia. Ds Size of square K Length of square ℓk JIS SP TRI Spiral Fluted Taps (for blind hole) ① JIS Spiral Fluted Taps for Tripod Threads Spiral Fluted Taps (for through hole) ② Specification ■Spiral Fluted Tap for camera tripod threads. Its thread size is oversized. Spiral Pointed Taps (for through hole) ③ Recommended Tapping Speeds depending on Materials Brass Brass castings Aluminum alloy castings Magnesium alloy die castings Zinc alloy castings 黄銅 黄銅鋳物 アルミ合金鋳物 マグネシウム合金鋳物 亜鉛合金鋳物 〜 10 〜 10 〜 10 〜 10 〜 10 Hand Taps ( m / min ) ( m / min ) ( m / min ) ( m / min ) ( m / min ) ④ TYPE：1 Cemented Carbide Taps ⑤ Segment：1C Roll Taps L ℓ ℓn ℓs Ds K ℓk No. of ⑥ Size Code Chamfer TYPE MSRP (mm) (mm) (mm) (mm) (mm) (mm) (mm) flutes For Tripod Threads 1/4-20 SYU04N0KEB 2.5P 62 15 26 33 6 4.5 7 3 1 ¥1,680 ※ Special Thread Taps Simple Inspection Tools Specifications of threads for mounting a camera on a tripod as ⑦ shown in the picture on the right. The tripod thread is larger by about 0.14 mm than the unified thread in terms of the accuracy of its pitch diameter of internal threads, while their thread shapes are the same. Pipe Taps ⑧ ■Comparison between tripod thread and unified thread unit：mm Pitch Minor Diameter Pitch Diameter Minor Diameter Size （P） （D） （D2） （D1） Basic size 6.350 5.525 4.975 Tripod thread 1.270 Maximum allowable size ～ 5.820 5.267 1/4-20 Minimum allowable size 6.460 5.635 4.975 Thread Mills Premium Thread Mills ⑨ Basic size 6.350 5.524 4.976 Unified thread 2B 1.270 Maximum allowable size ～ 5.648 5.257 1/4-20UNC Minimum allowable size ～ 5.525 4.979 ■ for Tripod Threads unit: mm ■ Bored hole size unit: mm Major Pitch Diameter Minor Minor diameter of internal thread（D1） Bored hole size Dies Diameter Diameter Size (reference) Max. Min. ⑩ Size Class Upper Lower Basic Basic Tolerance Tolerance Basic 1/4 - 20 5.267 4.975 5.19 Size Size ( μ m) ( μ m) Size ＋ ＋ 1/4 - 20 - 6.350 5.525 230 210 4.975 Center Drills Centering Tools ⑪ JIS ⑦-31 ※ = Specified Distribution Items. Made to order products.