Description
Insize 55° Setting Standard
The Insize 3281-SP4 is a 55° setting standard used to set and verify Insize 3281 series screw thread micrometers for 55° thread forms (e.g., Whitworth). It is an optional accessory matched to the 100–125 mm micrometer size and ensures accurate pitch-diameter measurements when a 55° thread angle is required.
Specifications :
-
Part No: 3281-SP4
-
Compatible Micrometers: 3281-125A, 3281-S125
-
Range: 100–125 mm
-
L: 143 mm
-
b: 70 mm
-
Thread Angle: 55° setting standard (optional accessory)
-
Measuring Tips: 6 pairs of measuring tips - metric and unified thread (60° thread angle)
- 0.4-0.5mm/ 64-48TPI, 0.6-0.9mm/ 44-28TPI, 1-1.75mm/ 24-14TPI, 2-3mm/ 13-9TPI, 3.5-5mm/8-5TPI, 5.5-7mm/ 4.5-3.5TPI
-
Use With: Insize 3281 series screw thread micrometers
-
Notes: 60° setting standards are supplied with micrometers (except 0–25 mm); 55° standards like SP4 are optional.
Precisely matched to the 100–125 mm size, the INSIZE 3281-SP4 setting standard helps achieve reliable and repeatable measurements on 55° thread forms.
