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J.W. DONCHIN CO. 4841-43 W. Chicago Ave. • Chicago, IL 60651-3224Ph: 773-261-2182 • Fax: 773-261-2867 • [email protected] • www.jwdonchin,com

PRECISION RULES, STRAIGHT EDGES & PARALLELSContents

Pg Description Range

347 PROTRACTORS AND ANGLE MEASUREMENTS

348 Precision Universal Bevel Vernier ProtractorsNo. 359 Series with fine adjustment Graduations in degrees thru 360º

349 How to Read a Vernier on Universal Bevel Protractors

350 Cutter Clearance Gage

No. 459 0-30º Range

351 Steel Protractors

No. C19 0-180º

No. C183 0-180º

352 Steel Protractor

No. C182 0-180º

Steel Protractor

No. 193 0-180º

353 Universal Bevel

No. 47 6”/150mm

Combination Bevel

No. 49 4”/100mm

354 Protractor and Depth Gages

No. 493 Series 0-180º

Special Dial Protractor Heads

355 Drill Point Gage

No. 22C 59º

356 Bevel Protractors

No. 490, 491 Series Reversible 0-180º

12 Series Non-reversible 0-180º

Starrett angular measuring tools rangefrom vernier protractors reading to 5 minutes of a degree, to regularprotractors reading to a degree and easilybeing able to estimate to 30 minutes.

There are also special purpose angularmeasuring gages such as cutterclearance gages, draftsman protractors,drill point gages and also a combinationprotractor and depth gage series.

All of our angular measurements are indegrees and minutes. When setting upand comparing true angles to the highestdegree of accuracy, we recommend usingStarrett-Webber Angle Gage Blocks (see Gage Block section). These areavailable in two styles, down to anamazing 1/4-second accuracy. WhatStarrett-Webber Master Gage Blocks areto length measurement, these blocks areto angle measurement.

There has been an effort by some in theinternational community to have anglesbe described by the use of radians. Theradian is the plane angle between tworadii of a circle, which cut off on thecircumference an arc equal in length to the radius.

The formula is: 180º = pi radiansTherefore, 1 radian is equal to 57.2958º,or 1 degree is equal to .017 radians.

We do not find any problems withmeasuring angles by using the traditionalstandard of degrees, minutes, andseconds, and find this to be acceptedworldwide.

PROTRACTORS ANDANGLE MEASUREMENTS

348

Graduations in degrees through 360ºIn Case

Blade Size Graduation Catalog No. EDP No.

7� C359BZ 51394

12� 5 min. or C359DZ 51396

7� & 12�1/12 degree C359FZ 51398

C359FZ W/SLC* 66929

AccessoriesDescription Catalog No. EDP No.

7� Blade Only PT04780 70538

12� Blade Only PT04781 70539

Acute Angle Attachment Only PT99329 51392

* Includes redemption card for Standard Letter of Certification (SLC).

Precision Universal Bevel Vernier ProtractorsNo. 359 Serieswith fine adjustmentGraduations in degrees thru 360º

These tools are designed for precisionmeasuring and for laying out angles. Theprotractor is one of the most valuable anduseful tools for the kit of every goodtoolmaker, inspector or machinist.

Readability Features◆ Satin chrome finish on all reading

surfaces – eliminates glare and resists rust

◆ Sharp, machine-divided graduations

Ease-of-Handling Features◆ Available with hardened 7� (175mm)

or 12� (300mm) blades which can berotated to the desired angle andadjusted to the desired length

◆ Both the dial and the blade can belocked independently

◆ An acute angle attachment is available◆ Flush surfaces on the base permits use

on height gages◆ One side of the tool is flat so it can be

laid on paper or on the work

Accuracy Features◆ Machine-divided graduations read to 5

minutes (1/12 of a degree) and accuracyis finer than can be read

◆ The most convenient, ultra-sensitive fineadjustment for precision setting

Packed one in a box.

No. 359 checking angles Measuring obtuse angle. Measuring acute angle.on fixture.


349

Starrett Universal Bevel Protractors with Vernier can be accuratelyread to 5 minutes (5�) or 1/12 of a degree. The dial of the protractoris graduated both to the right and left of zero up to 90 degrees. TheVernier scale is also graduated to the right and left of zero up to 60 minutes (60�), each of the 12 Vernier graduations representing 5 minutes. Any angle can be measured, and remember that theVernier reading must be read in the same direction from zero as theprotractor, either left or right.

Since 12 graduations on the Vernier scale occupy the same spaceas 23 graduations or 23 degrees on the protractor dial, each Verniergraduation is 1/12 degree or 5 minutes shorter than 2 graduationson the protractor dial. Therefore, if the zero graduation on theVernier scale coincides with a graduation on the protractor dial, thereading is in exact degrees, but if some other graduation on the

Vernier scale coincides with a protractor graduation, the number ofVernier graduations multiplied by 5 minutes must be added to thenumber of degrees read between the zeros on the protractor dialand Vernier scale.

Example: ★ In the illustration above, the zero on the Vernier scale lies

between the “50” and “51” on the protractor dial to the left ofthe zero, indicating 50 whole degrees. Also reading to the left,the 4th line on the Vernier scale coincides with a graduation onthe protractor dial as indicated by the stars and therefore 4 x 5minutes or 20 minutes are to be added to the number ofdegrees. The reading of the protractor therefore, is 50 degreesand 20 minutes (50º 20�).

How to Read a Vernier on Universal Bevel Protractors

★

★


350

Range

Catalog No. EDP No. Clearance Angles Cutter Diameter

459Z 52430 0-30º Up to 30�

Cutter Clearance GageNo. 459 0-30º Range

This is a special gage that makes itpossible to accurately and quicklydetermine correct clearance angles formaximum in cutter efficiency.

Benefits◆ Eliminates guesswork and elaborate

gaging equipment◆ Highly versatile – this tool will measure

clearance angles up to 30º on helical,straight, side or inserted tooth millingcutters, straight or helical end mills,T-slot cutters, metal cutting saws, andbroaches

◆ Can be used on cutters from 2-30�(50-760mm) diameter and also oncutters and end mills from 1/2-2�(12.7-50mm) if teeth are evenly spaced

◆ Hardened for long life

Use◆ This gage is made of the finest tool

steel, hardened for long life, and isextremely easy to use. It consists of aframe graduated from 0-30º and havinga fixed foot, an adjustable sliding foot onthe beam extension of the frame, and ablade which is adjustable angularly andperpendicularly to contact the clearanceangle of any cutter tooth

◆ To use the gage, the feet are positionedon two alternate teeth of the cutter withthe gage at right angles to the cutteraxis and the adjustable blade, which isset at the correct clearance angle.This shows at a glance when the cuttertooth is ground to the desired angle (see photo)

Furnished in attractive, protective case. Packedone in a box.


351

Steel ProtractorsNo. C19 0-180º

No. C183 0-180º

No. C19This is a highly useful and accurate tool forsetting bevels, transferring angles, smallsquaring tasks, checking cutter clearanceswithin certain limits, and many otherapplications.

◆ Double graduations from 0-180º inopposite directions permitting the directreading of angles and supplementaryangles

◆ The back of the tool is flat for ease ofuse

◆ The blade can be locked firmly at anyangle by the lock nut

◆ Satin chrome finish for ease of readingand resistance to rust

No. C183This protractor is exactly the same as theNo. C19, except that is has a rectangularhead, thus providing four convenientworking edges.


Blade Length Range Catalog No. EDP No.

C19 50127

6� 0-180º C183 50672

C183 W/SLC* 66930

* Includes redemption card for Standard Letter of Certification (SLC).

Top, No C19; bottom, No. C183.


352

Steel ProtractorNo. C182 0-180º

This protractor has the same type of headas our No. 19 but it is designed fordraftsmen, civil engineers, and others whoneed a protractor that will allow thedrawing of any number of radial lines atany angle through a common center. This isespecially useful for someone in the fieldwho can only carry a minimum ofequipment. Weight is approximately 3 ounces.

To use the protractor, the fulcrum point ispressed into the drawing at the requiredcenter. This is done by removing thefulcrum point from the hub, pressing it inthe drawing, and then placing theprotractor hub over the fulcrum point. Thedesired angles can then be layed out.

The fulcrum point can be left in the tool.Press the whole tool down so that the pointpenetrates the drawing. (However, this willmake it harder to find the center.)

◆ When not in use, the fulcrum point canbe drawn back into the hub andfrictionally held in a safe position

◆ Satin chrome finish for ease of readingand resistance to rust

◆ Furnished with one needle point and onecone point

Catalog No. EDP No. Blade Length Range

C182 64361 6� 0-180º

Catalog No. EDP No. Range

193 50696 0-180º


Steel ProtractorNo. 193 0-180º

This protractor can be used with the No. 47 and No. 49 Universal Bevels bysetting them against the revolving stud,which quickly and economically convertsthem into Bevel Protractors. Protractor has double graduations from 0-180º inopposite directions.

Side view of protractor with fulcrum point in place.


353

Universal BevelNo. 47 6� / 150mm

This improved Universal Bevel has bothoffset and straight slots in the blade, incombination with straight slots in the stockthat allow for a wide variety of adjustmentand angle settings that are impossible toobtain with many ordinary bevels.

Length of the blade is 6� (150mm), and thestock, 3 1/2� (90mm). The stock lies flat onthe work or paper since the head of theclamping bolt is recessed. This tool can beset to duplicate an angle from a master, orit may be easily converted into a BevelProtractor by using this tool with the No. 193 Protractor.

Catalog No. EDP No. Blade Length

47 50266 6�

Catalog No. EDP No. Blade Length

49 50267 4� (approx.)



Combination BevelNo. 49 4� / 100mm

Any angle may be easily transferred fromone surface to another with the No. 49Combination Bevel. This tool has a slottedblade which swings on a stud on the stockto any angle desired, and is locked inposition by a knurled thumb nut.

An auxiliary blade, also furnished, may beeasily attached to the slotted blade and isclamped at any angle by a knurled nut. Thestock is square at one end and is beveled45º at the other. The auxiliary blade isbeveled to 30º and 60º at opposite ends.Stock and blades are approximately 4�(100mm) long. The tool lies flat on thework. It may also be used with No. 193Protractor.


354

Blade Length Blade Graduations Range Catalog No. EDP No.

6� 32nds, 64ths 0-180ºC493 52532

C493B 52534

Protractor and DepthGagesNo. 493 Series 0-180º

The ability to measure angles and depths iscombined in these convenient tools.

No. C493◆ Angular measurement is from 0-180º

in opposite directions allowing the direct reading of angles andsupplementary angles

◆ Depths are measured from a 6�(150mm) blade (our No. C610N)

◆ Both tools have a flat surface on theback of the head permitting laying thetool flat on paper or work

◆ No-glare satin chrome finish◆ The No. C493 has a semicircular head

No. C493BThis gage is exactly the same as the No. C493, except that it has a rectangularprotractor head which provides fourconvenient working edges.


Left, No. C493; right, No. C493B.

Special Dial Protractor HeadsWe make dial protractor heads for specialapplications that permit rapid angularmeasurements over a 90º range, inincrements of 5 minutes.

These special tools are similar to AGDGroup-2 Dial Indicators. They have a rear-mounted rotary input shaft attached to amovable arm that measures the angle inrelation to a fixed arm.

They are available with continuous orbalanced dials and with clockwise orcounterclockwise reading.

(See our Special Gage Division section formore information.)


355

Drill Point GageNo. 22C 59º

This gage was designed specifically for use in drill grinding. It provides a quick,accurate way for determining thecorrect drill point angle of 59º and the correct length of drill lips necessaryfor clean-cut drilling at maximum feeds and speeds.

◆ The sliding head may be adjusted to anyposition along the rule and locked by athumb nut

◆ The head is beveled to 59º (the correctdrill point angle), and is also graduatedin 32nds along the 59º face formeasuring the drill lips which should beof equal lengths

◆ The hook rule has accurate, machine-divided graduations in 8ths, 16ths,quick-reading 32nds and 64ths

◆ Hook is adjustable and can be shortenedor extended on either side of the rule,and may also be removed if desired

◆ Tool can also be used as a Plain Rule,Hook Rule, Depth Gage, and SlideCaliper. The No. 22D Head-only will fit allsteel rules 3/4� wide by 3/64� thick


Head Hook Rule

Catalog No. EDP No. Bevel Graduations Length Graduations

22C 50150 59º 32nds 6�8ths, 16ths; Quick-Reading 32nds, 64ths

22D 50151 Sliding Head Only


356

Reversible Non-reversible

Black Wrinkle Finish Black Smooth Finish Black Wrinkle Finish

Size Blade Finish Graduation Cat. No. EDP No. Cat. No. EDP No. Cat. No. EDP No.

Satin ChromeC491-12-4R 64602 C490-12-4R 52514 C12-12-4R 64290

12� No. 4R: 8ths, 16ths, C12-12-4R W/SLC* 66931

Quick Reading, 491-12-4R 52521 490-12-4R 52511 12-12-4R 50103

18� Regular 32nds, 64ths 491-18-4R 52522 490-18-4R 52512 12-18-4R 50104

24� 491-24-4R 52523 490-24-4R 52513 12-24-4R 50105

300mm Regular 1/2mm & 32nds one side; 491ME-300 52524 12ME-300 50106& 11 3/4� mm & 64ths, reverse side

Bevel ProtractorsNos. 490, 491 SeriesReversible 0-180º

No. 12 SeriesNon-reversible 0-180º

Readability Features◆ Starrett satin chrome blades and

protractor heads for easier reading areavailable (on 12� sizes)

◆ Direct reading 0-180º in oppositedirections, permitting the direct readingof angles and supplementary angles

Ease-of-Handling Features◆ Reversible lock bolt allows choice of

which graduated side of the blade facesthe operator

◆ The No. 12 is non-reversible, meaningthe blade is on the outside of the frame,so the frame stays on the same side ofthe workpiece

◆ The No. 490 and No. 491 are reversible,meaning there is a shoulder on bothsides of the blade, allowing the tool tobe reversed so the same angle can bescribed or measured left and right

Long-Life and Accuracy Features◆ Protractor heads are made of stable cast

iron and finished with a choice of attractiveblack wrinkle finish or smooth black finish


Above, non-reversible protractor with blackwrinkle finish; below, reversible with smoothfinish; inset, close-up of spirit level on backside of protractor.

* Includes redemption card for Standard Letter of Certification (SLC).NOTE: Since the protractor heads and blades are furnished with combination square sets, individual protractor heads or blades can be ordered separately.See the Squares section for information and catalog numbers.

◆ Tempered steel blades with accurate,machine-divided graduations

◆ A spirit level indicates when the basereference surface is level – a featurenot usually available on comparableprotractors.

PROTRACTORS ANDANGLE MEASUREMENT

J.W. DONCHIN CO.Precision Measuring Equipment and Industrial Supplies since 1924.

www.jwdonchin.com

4841 W. Chicago Ave. - Chicago, IL 60651 • Phone: 773-261-2182 • Fax: 773-261-2867 • [email protected]

J.W. DONCHIN CO.

J.W. Donchin Co. was established in 1924 and has been known world wide ever since. Customer Service is our Main Focus. We offerExpert Product Knowledge, Large Stocking Inventory and Competitive Pricing to assist you in locating and selecting the correcttool or product to fit your needs. (J.W. Donchin Co. is one of L.S. Starrett’s largest stocking distributors.)

Contact Information:

Phone: 773-261-2182

Fax: 773-261-2867

Email: [email protected]

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