290 SERIES PRECISION MEASUREMENT PITCH DIAMETER OF GEARS & SPLINES

Maximum Measuring Accuracy
Linear ≤ ±0.000040″ (±0.001 mm)
Repeatability ≤ 0.000020″ (< 0.0005 mm)
Gage R & R ≤10% measuring close tolerance parts.

Description

Notable Features
 Accuracy and large range.
 Select any carbide ball size. Many standard and custom balls in stock.
 Carbide ball contacts thread on measuring head.
 Customized standards. Contact Dyer office.

Automotive Application
Gear pitch diameter of transmission and drive shaft components.

Chart A. 290 Series Models and Specifications

Rang	e	Maximum Diameter Balls¹	Maximum Travel/Contact	Order No.
Inch	mm	Maximum Diameter Balls¹	Maximum Travel/Contact	Order No.
0.315–0.472	8–12	0.059	±0.010	290-005**
0.472 –0.866	12–22	0.157	±0.011	290-010
0.866–2.165	22–55	0.276	±0.019	290-015
2.165–9.84	55–250	0.276	±0.027	290-020
3.397–20.079	100–510	0.276	±0.027	290-030

**Small ranges require fixed contact points for each measurement size.
1 Large ball sizes available. Contact Dyer with your application.

Chart B. 290 Series Threaded Carbide Ball Contacts*

Order No. (Set)	For Gage Model	Thread Size
290-105**	290-005	M 1.6
290-110	290-010	M 1.6
290-115	290-015	M 2.5
290-120	290-020	M 4
290-130	290-030	M 4

* You must specify carbide ball size when ordering.
** Small ranges require fixed contact points for each measurement size.

How to order

Select basic gage with measuring range you require. (See chart A)
Select a set of carbide ball threaded contact points. (See chart B). You must specify carbide ball size when ordering.
Select indicator, mechanical or electronic. See Section E.

Long handle 290 Series, for short handles contact Dyer