SUMMIT FIRM JOINT CALIPER

  • Firm Joint Calipers are ideal measurement tools for taking transfer measurements of length or working parts in an industrial setup. The legs are tempered and precision-formed to shape according to style and purpose, and are held together by a large-headed nut and screw assembly with fiber washers interposed between the contacting faces.
  • This construction creates a firm friction joint that is rigid and completely without play. Once set, the caliper holds its dimension reliably under workshop and production floor conditions- making it a trusted tool for repetitive comparison and transfer work across lathe, CNC, and VMC environments.
  • The nominal size is measured as the distance from the center of the nut to the working point of the leg, which also defines the effective measurement capacity of the instrument.
MATERIAL TIP Size JOINT TYPE ORIGIN
High Carbon Steel Hardened & Temered 6″ – 36″ FIRM FRICTION JOINT INDIA SINCE 1962

 

Steel Grade High Carbon Steel – tempered legs
Joint Mechanism Large-headed nut & screw with fiber washers
Joint Characteristic Rigid friction joint – no play, no spring
Tips Hardened & tempered for wear resistance
Size Range 6 inches to 36 inches (up to 40″ on request)
Manufactured India since 1962 • Exported Worldwide

Key Features

  • Tempered legs precision-formed to purpose – inside or outside configurations
  • Large-headed nut and screw with fiber washers for a play-free friction joint
  • Rigid setting – no spring tension, no drift once adjusted
  • All tips hardened and tempered for extra durability and wear resistance
  • Nominal size = distance from nut center to leg point (effective capacity)
  • Available up to 40 inches for large-scale industrial applications

Available Sizes

 

PART NO SIZE MM APPLICATION NOTE
SFJ6 6″ 150 General purpose – lathe, CNC & VMC in-process gauging, Wood working DIY
SFJ8 8″ 200 Medium shop, bench & CNC work
SFJ10 10″ 250 Tool room, jig & fixture verification
SFJ12 12″ 300 Large bore & turned component inspection
SFJ18 18″ 450 Heavy fabrication & casting work
SFJ24 24″ 600 Structural & heavy engineering
SFJ36 36″ 900 Large industrial assemblies & weldments

CONSTRUCTION & MATERIALS
Where spring calipers rely on tension to maintain their setting, the Firm Joint Caliper relies on friction. The screw and nut assembly clamps the legs at the desired angle, and the interposed fiber washers provide just enough resistance to prevent drift without making adjustment difficult.
The result is a caliper especially well-suited to repetitive gauging tasks – whether checking dimensions off a lathe, verifying part tolerances on a CNC turning center or VMC, or inspecting precision components across industries such as automotive, general engineering and emerging
high-precision manufacturing sectors. The setting does not change between parts.