JIS SP TRI

Spiral Fluted Taps for Tripod Threads

Specification

■ Spiral Fluted Tap for camera tripod threads. Its

thread size is oversized.

Recommended Tapping Speeds depending on Materials

BrassBrass castingsAluminum alloy castingsMagnesium alloy die castingsZinc alloy castings
10黄銅黄銅鋳物10アルミ合金鋳物10マグネシウム合金鋳物10亜鉛合金鋳物10
(m/min)(m/min)( m/ min)(m/min)(m/min)

TYPE:1

Segment:1C

SizeCodeChamferL (mm)ℓ (mm)ℓn (mm)ℓs (mm)Ds (mm)K (mm)ℓk (mm)No. of flutesTYPEMSRP
For Tripod Threads
1/4-20SYU04N0KEB2.5P6215263364.5731¥ 1,680 ※

Specifications of threads for mounting a camera on a tripod as

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.

■Comparison between tripod thread and unified thread unit: mm

PitchMinor DiameterPitch DiameterMinor Diameter
Size
(P)(D)(D )(D )
21
Basic size6.3505.5254.975
Tripod thread
1.270Maximum allowable size5.8205.267
1/4-20
Minimum allowable size6.4605.6354.975
Basic size6.3505.5244.976
Unified thread 2B
1.270Maximum allowable size5.6485.257
1/4-20UNC
Minimum allowable size5.5254.979

■ for Tripod Threads ■ Bored hole size unit: mm unit: mm

Size Minor diameter of int Max.ernal thread (D1)Bored hole size (reference) Min.
1/4 - 20 5.2674.975 5.19
SizeClassUpperLower
SizeSize( μ m)( μ m)Size
1/4- 20-6.3505.5252302104.975