Inch Graduation Styles for Steel Rules, Summaries of Mechanics

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Precision Steel Rules

Starrett rules are made from fine quality steel and produced to the

highest precision standards, making them the most accurate and

readable precision steel rules available Through over 125 years

of experience, we have developed the following versatile features,

designs and styles:

Our product line consists of:

• Full-flexible 1/64"-1/50" (0 4-0 5mm)

thick

• Semi-flexible 1/50-1/40" (0 5-0 6mm) thick
• Spring-tempered 3/64" (1 2mm) thick
• Heavy spring-tempered 1/10" (2 5mm) thick
• Stainless steel 1/64" or 3/64" (0 4 or 1 2mm) thick rules
• Graduation styles are inch, millimeter, inch and millimeter, shrink,

and special graduations

• All rules are photo-engraved and tempered for long life and

flexibility

Accuracy

• All of our precision steel rules are photo-engraved We inspect

to Starrett Master Standards, which are traceable to the National

Institute of Standards and Technology

• Measuring Tip: When using a precision rule for very close

accuracy, the eye can read better by measuring between two lines

rather than from the end of the rule to a line

Rule with Aircraft Quick-Reading Graduations on lower edge

Rule with Quick-Reading Graduations on both edges

Readability Features

• The numbering size and style is distinctive and more readable

than ordinary rules

• Advanced, staggered graduations- When reading lines, it is much

easier to count lines of differing lengths than those that resemble

a comb All Starrett graduations are staggered in a height pattern

that makes reading easy For reading very fine graduations

such as 50ths ( 020") or 100ths ( 010") of an inch, Starrett

designed an improved pattern of lines called “Aircraft Quick-

Reading Graduations” (see photo, above) The name stems from

its extreme popularity in aircraft plants and other shops using

decimals This pattern is also used on some of our millimeter rules

• Quick-reading figures are furnished with finer graduations for

easier counting Most all inch graduations of 1/32" and finer have

subdivisions numbered (see photo)

• All rules are available in Starrett no-glare satin chrome finish for

easier reading and rust resistance

• There are still some old “D” style rules on the market These have

one square and one rounded end All Starrett rules are ground

square on both ends This provides better efficiency through the

ability to read from either end on all edges

Inch Graduation Styles

7R*

First Edge: 100ths

Second Edge: 64ths

Fourth Edge: 32nds

Third Edge: 16ths

9R*

First Edge: None

Second Edge: 64ths

Fourth Edge: 16ths

Third Edge: 32nds

10R*

First Edge: 64ths

Second Edge: 32nds

No 11

First Edge: None

Second Edge: 100ths

Third Edge: None

Fourth Edge: 64ths

16R*

First Edge: 50ths

Second Edge: 100ths

Fourth Edge: 32nds

Third Edge: 64ths

• Suffix “R” designates Quick-Reading graduations NOTE: All rules under 1" in width have single row of inch figures Rules 1" and wider have double row of inch figures, and each edge represents the bottom edge reading left to right

Useful Variation Features of Our

Standard Precision Rules

End Graduations

End graduations are useful for measuring depths, widths of shoulders,

recesses, grooves, etc They are graduated in 32nds of an inch or

millimeters on both ends of one side as shown at the right

Adjustable Steel Hook Rules

These improved Hook Rules feature an adjustable double hook that can

be shortened or extended on either side in relation to any one of the

four graduations on the rule This allows accurate measurements from

shallow or deep shoulders and also permits setting inside calipers to

any of the graduations Hooks are hardened and may be adjusted or

removed by a slight turn of an eccentric stud

Steel Hook Rules with Reversible Hook

These convenient Hook Rules permit accurate measurements, even

when the user cannot see if the rule is aligned with the measuring

edge This is especially useful for measuring from round corners,

through hubs, for setting inside calipers, etc The single hook is

hardened and may be reversed or removed by a slight turn of an

eccentric stud

Narrow Hook Rules with Reversible Hook

These useful Hook Rules are similar to the Hook Rules described

above, but have a narrow blade [only 3/16" (4 8mm) wide] which

permits measurements through holes as small as 7/32" (5 5mm) in

diameter Hooks are hardened and may be reversed or removed by a

partial turn of the eccentric stud

Steel Rule with Tapered End

This 6" rule, our C310T-6, is a favorite with all mechanics because

the tapered end permits measuring insides of small holes, narrow

slots, grooves, recesses, etc The rule has a taper from 1/2" width

at the 2" graduation to 1/8" width at the end Accurate, distinctive,

photo-engraved graduations in 32nds are on one side and 64ths on

the reverse side, with graduations always in a normal, easy-to-read

position Made of tempered, full-flexible steel with satin chrome finish

Steel Rule with Pocket Clip

This handy 6" rule is designed for frequent use It is made of tempered,

full-flexible steel and has accurate, photo-engraved graduations in

32nds on one edge and 64ths on the opposite edge, with satin chrome

finish C310K-

Steel Rules with Inch

Graduations

All rules furnished with Starrett satin chrome

finish, except where noted Additional sizes

and variations available on special order

Standard Case for

6"/150mm Rules

For added convenience and protection, all 6"

and 150mm rules in 1/2" and 3/4" widths

(except hook rules) are furnished at no extra

cost in this attractive, protective case with

see-through front

Case with Clip

A leather-like case with pocket clip for 6"

(150mm) steel rules Rounded metal-bound

edges prevent pockets from becoming worn

and torn by rule corners

6" Spring-Tempered Steel Rules with Inch Graduations Length Width x Thickness Graduations Feature Remarks Catalog No EDP

3/4" x 3/64"

1 – 10ths, 20ths, 50ths, 100ths; 12ths, 24ths, 48ths; 16ths, 32nds, 64ths; 14ths, 28ths See Below**^ *C601-6^52639

4R – 8ths, 16ths, Quick-Reading 32nds and 64ths

Regular Steel Finish *604R-6 52645 *C604R-6 52678 With Standard Letter of Certification† *C604R-6 W/SLC 66884 4R – 8ths, 16ths, Quick-Reading 32nds and 64ths End Graduations in 32nds Both Ends, One Side End Graduations^ *C604RE-6^52660

4R – 8ths, 16ths, Quick-Reading 32nds and 64ths

Regular Steel Finish With Reversible Hook *H604R-6^52667 With Reversible Hook *CH604R-6 52673 Regular Steel Finish With Adjustable Double Hook *DH604R-6^52662 With Adjustable Double Hook *CD604R-6 52665 6R – Both Sides – Aircraft Quick-Reading 50ths ( 02) Both Edges One Side, Quick-Reading 10ths ( 10) Both Edges, Opposite Side *C606R-6^52652 7R – 16ths, Quick-Reading 32nds, 64ths, Aircraft Quick-Reading 100ths *C607R-6 52688 16R – Quick-Reading 32nds, 64ths, Aircraft Quick-Reading 50ths, 100ths *C616R-6 52701 4R – 8ths, 16ths, Quick-Reading 32nds and 64ths Stainless Steel *1604R-6 53210

3/16" x 3/64" 10 – 32nds One Side and 64ths on Reverse Side

Regular Steel Finish; Narrow Rule *610N-6 52694 Narrow Rule *C610N-6 52696 Regular Steel Finish; Narrow Rule with Hook *H610N-6 52697 Narrow Rule with Hook *CH610N-6 52699 11 – 64ths on One Side and 100ths on Reverse Side Regular Steel Finish; Narrow Rule *611N-6 52700 † Includes redemption card for Standard Letter of Certification (SLC)

• Indicates rules with single row of inch figures (all rules under 1" width) Rules without asterisk have double row of inch figures, and each edge represents the bottom edge reading left to right (rules 1" and wider) ** 1 pattern has 12 different grads , many that are not found on usual rules This allows the rule to be used for various purposes like laying out and cutting gear teeth (not generally used today)

Cases for 6"/150mm Rules Description Catalog No EDP Case with Clip for 1/2" (12 7mm) Wide Rules 1612 55433 Case with Clip for 3/4" (19mm) Wide Rules 1634 55434

Steel Rules with Inch Graduations

All rules furnished with Starrett satin chrome finish, except where noted

Additional sizes and variations available on special order

12" Full-Flexible Steel Rules with Inch Graduations Length Width x Thickness Graduations Feature Remarks Catalog No EDP

12" 1/2" x 1/64"

4R – 8ths, 16ths, Quick-Reading 32nds and 64ths *C304R-12 66009 5R – Quick-Reading 10ths, Aircraft Quick-Reading 100ths, 32nds and 64ths

*C305R-12 51348

With Standard Letter of Certification† *C305R-12 W/SLC 66881 6R – One Side Only – Quick-Reading 10ths ( 10) Top Edge; Aircraft Quick-Reading 50ths ( 02) Bottom Edge *C306R-12 51353 10R – Quick-Reading 32nds and 64ths One Side Only *C310R-12 56429 16R – Quick-Reading 32nds, 64ths, Aircraft Quick-Reading 50ths and 100ths *C316R-12 51375 12" Semi-Flexible Steel Rules with Inch Graduations

12" 1" x 1/50"

3R – Quick-Reading 10ths, Aircraft Quick-Reading 50ths, 32nds and 64ths C303SR-12 51336 4R – 8ths, 16ths, Quick-Reading 32nds and 64ths; End Graduations in 32nds Both Ends, One Side End Graduations^ C304SRE-12^51344 12" Spring-Tempered Steel Rules with Inch Graduations

1" x 3/64"

1 – 10ths, 20ths, 50ths, 100ths; 12ths, 24ths, 48ths; 16ths, 32nds, 64ths; 14ths, 28ths See Note on Previous Page **^ C601-12^52640

4R – 8ths, 16ths, Quick-Reading 32nds and 64ths

Regular Steel Finish 604R-12 52647 C604R-12 52679 With Standard Letter of Certification† C604R-12 W/SLC 66885 4R – 8ths, 16ths, Quick-Reading 32nds and 64ths; End Graduations in 32nds Both Ends, One Side End Graduations^ C604RE-12^52661

4R – 8ths, 16ths, Quick-Reading 32nds and 64ths

Regular Steel Finish With Reversible Hook H604R-12^52669 With Reversible Hook CH604R-12 52674 Regular Steel Finish With Adjustable Double Hook DH604R-12^52664 With Adjustable Double Hook CD604R-12 52666 6R – Both Sides – Aircraft Quick-Reading 50ths ( 02) Both Edges, One Side; Quick-Reading 10ths ( 10) Both Edges, Opposite Side C606R-12^52653 7R – 16ths, Quick-Reading 32nds, 64ths, Aircraft Quick-Reading 100ths C607R-12 52689 16R – Quick-Reading 32nds, 64ths, Aircraft Quick-Reading 50ths, 100ths C616R-12 52702 4R – 8ths, 16ths, Quick-Reading 32nds and 64ths Stainless Steel 1604R-12 53211

3/16" x 3/64" 10 – 32nds One Side and 64ths on Reverse Side

Regular Steel Finish; Narrow Rule *610N-12 52695 Narrow Rule *C610N-12 67103 Regular Steel Finish; Narrow Rule with Hook *H610N-12 52698 † Includes redemption card for Standard Letter of Certification (SLC)

• Indicates rules with single row of inch figures (all rules under 1" width) Rules without asterisk have double row of inch figures, and each edge represents the bottom edge reading left to right (rules 1" and wider)

Steel Rules with Inch Graduations

All rules furnished with Starrett satin chrome finish, except where noted

Additional sizes and variations available on special order

36" Spring-Tempered Steel Rules with Inch Graduations Length Width x Thickness Graduations Feature Remarks Catalog No EDP

36" 1-1/4" x 3/64" 4R – 8ths, 16ths, Quick-Reading 32nds and 64ths

C604R-36 52682

With Hook CH604R-36 52677 7R – 16ths, Quick-Reading 32nds, 64ths, Aircraft Quick-Reading 100ths C607R-36 56436 36" Heavy Spring-Tempered Steel Rules with Inch Graduations

36" 1-1/2" x 1/10"

4R – 8ths, 16ths, Quick-Reading 32nds and 64ths

C404R-36 51485

With Standard Letter of Certification† C404R-36 W/SLC 66888 With Hook CH404R-36 51495 16R – Quick-Reading 32nds, 64ths, Aircraft Quick-Reading 50ths and 100ths

C416R-36 51510

With Hook CH416R-36 51520 48" Spring-Tempered Steel Rules with Inch Graduations 48" 1-1/4" x 3/64" 4R – 8ths, 16ths, Quick-Reading 32nds and 64ths C604R-48 52683 7R – 16ths, Quick-Reading 32nds, 64ths, Aircraft Quick-Reading 100ths C607R-48 56437 48-144" Heavy Spring-Tempered Steel Rules with Inch Graduations

1-1/2" x 1/10"

4R – 8ths, 16ths, Quick-Reading 32nds and 64ths

C404R-48 51486

With Standard Letter of Certification† C404R-48 W/SLC 66889 With Hook CH404R-48 51496 16R – Quick-Reading 32nds, 64ths, Aircraft Quick-Reading 50ths and 100ths

C416R-48 51511

With Hook CH416R-48 51521

4R – 8ths, 16ths, Quick-Reading 32nds and 64ths

C404R-72 51488

With Hook CH404R-72 51498 16R – Quick-Reading 32nds, 64ths, Aircraft Quick-Reading 50ths and 100ths

C416R-72 51513

With Hook CH416R-72 51523

4R – 8ths, 16ths, Quick-Reading 32nds and 64ths

C404R-96 56191

With Hook CH404R-96 56474 16R – Quick-Reading 32nds, 64ths, Aircraft Quick-Reading 50ths and 100ths

C416R-96 56197

With Hook CH416R-96 56477

4R – 8ths, 16ths, Quick-Reading 32nds and 64ths

C404R-120 56192

With Hook CH404R-120 56475 16R – Quick-Reading 32nds, 64ths, Aircraft Quick-Reading 50ths and 100ths

C416R-120 56198

With Hook CH416R-120 56478

4R – 8ths, 16ths, Quick-Reading 32nds and 64ths

C404R-144 56193

With Hook CH404R-144 56476 16R – Quick-Reading 32nds, 64ths, Aircraft Quick-Reading 50ths and 100ths

C416R-144 56199

With Hook CH416R-144 56479 All C404R and C416R Rules furnished with hole in end for hanging † Includes redemption card for Standard Letter of Certification (SLC)

Millimeter Graduation Styles

First Edge: None

Second Edge: 1/2mm

Fourth Edge: 1/2mm

Third Edge: mm

First Edge: mm

Second Edge: 1/2mm

Fourth Edge: mm

Third Edge: 1/2mm

35E

First Edge: mm

End Graduations: mm

Second Edge: 1/2mm

Fourth Edge: mm

Third Edge: 1/2mm

First Edge: mm

Second Edge: 1/2mm

Fourth Edge: 1/2mm

Third Edge: mm

37E

First Edge: mm

End Graduations: mm

Second Edge: 1/2mm

Fourth Edge: 1/2mm

Third Edge: mm

NOTE: All rules under 25mm in width have single row of millimeter figures Rules 25mm and wider have double row of millimeter figures, and each edge represents the bottom edge reading left to right

Reads both left-to-right

and right-to-left A

Starrett original feature

Millimeter and Inch

Graduation Styles

First Edge: 32nds

Second Edge: 64ths

Fourth Edge: 1/2mm

Third Edge: mm

First Edge: 10ths

Second Edge: 50ths

Fourth Edge: mm

Third Edge: 1/2mm

First Edge: 32nds

Second Edge: 1/2mm

Fourth Edge: mm

Third Edge: 64ths

Catalog C636EM-

31, 34, and 36* Styles are graduated as follows:

• 150mm end-to-end on mm edges and to 5-3/4" with a blank end on the inch edges
• 300mm end-to-end on mm edges and to 11-3/4" with a blank end on the inch edges
• 500mm end-to-end on mm edges and to 19-1/2" with a blank end on the inch edges
• 1000mm end-to-end on mm edges and to 39-1/4" with a blank end on the inch edges

Catalog C636EM-6 is graduated as follows:

• 6" end-to-end on the inch edges and to 150mm with a blank end on the mm edges

NOTE: * Millimeter/Inch scale with emphasis on millimeter Overall length is 150mm (5 905") Inch graduations stop at 5-3/4" to avoid confusion

Steel Rules with Millimeter and

Inch Graduations

All rules are full millimeter lengths, except where noted Additional

sizes and variations available on special order

Rules include:

• Full-Flexible
• Spring-Tempered

Key to Starrett Rule Numbering System:

Prefixes: Suffixes:

C – Satin Chrome Finish EM – English/ Metric

ME – Metric/English

150mm - 5-3/4" Full-Flexible Steel Rules with Millimeter and Inch Graduations Length Width x Thickness Graduations Feature Remarks Catalog No EDP 150mm 12 x 0 4mm

31 – 32nds and 64ths on One Side; mm and 1/2mm on Reverse All Four Edges Graduated from Same End C331-150 51331 5-3/4" 34 – mm and 1/2mm on One Side; Quick-Reading 10ths (Reverse 10) and Aircraft Quick-Reading 50ths (^ 02) on C334-150 56262 150mm - 6" Spring-Tempered Steel Rules with Millimeter and Inch Graduations 150mm 5-3/4" 19 x 1 2mm 36 – 32nds and 1/2mm on One Side; 64ths and mm on Reverse

C636ME-150 52634

With Standard Letter of Certification* C636ME-150 W/SLC 66890 150mm 6"

Full 6" with Millimeter Reading to 150mm; plus a Blank End C636EM-6^57064 300mm - 11-3/4" Full-Flexible Steel Rules with Millimeter and Inch Graduations 300mm 12 7 x 0 4mm 31 – 32nds and 64ths on One Side; mm and 1/2mm on Reverse All Four Edges Graduated from Same End C331-300 51332 11-3/4" 34 – mm and 1/2mm One Side; Quick-Reading 10ths ( 10) and Aircraft Quick-Reading 50ths ( 02) on Reverse C334-300 56696 300mm - 11-3/4" Spring-Tempered Steel Rules with Millimeter and Inch Graduations 300mm 11-3/4" 25 4 x 1^ 2mm^ 36 – 32nds and 1/2mm on One Side; 64ths and mm on Reverse^

C636-300 52635

With Standard Letter of Certification* C636-300 W/SLC 66891 500mm - 19-1/2" Full-Flexible Steel Rules with Millimeter and Inch Graduations 500mm 19-1/2" 19 x 0^ 5mm^

34 – mm and 1/2mm on One Side; Quick-Reading 10ths ( 10) and Aircraft Quick-Reading 50ths ( 02) on Reverse C334-500^56697 500mm - 19-1/2" Spring-Tempered Steel Rules with Millimeter and Inch Graduations 500mm 19-1/2" 29 x 1^ 2mm^ 36 – 32nds and 1/2mm on One Side; 64ths and mm on Reverse^ C636-500^52636 1000mm - 39-1/4" Full-Flexible Steel Rules with Millimeter and Inch Graduations 1000mm 39-1/4" 19 x 0^ 5mm^

34 – mm and 1/2mm on One Side; Quick-Reading 10ths ( 10) and Aircraft Quick-Reading 50ths ( 02) on Reverse C334-1000^56698 1000mm - 39-1/4" Spring-Tempered Steel Rules with Millimeter and Inch Graduations 1000mm 39-1/4" 32 x 1^ 2mm^ 36 – 32nds and 1/2mm on One Side; 64ths and mm on Reverse^

C636-1000 52637

With Standard Letter of Certification* C636-1000 W/SLC 66892

• Includes redemption card for Standard Letter of Certification (SLC)

C622R-6 Steel

Rule with Decimal

Equivalents

One side of this handy rule has accurate,

photo-engraved, distinctive graduations in

both Quick-Reading 32nds and 64ths The

reverse side has a legible table of fractions

and decimal equivalents Made of finest

spring-tempered steel with no-glare satin

chrome finish

C623R-6 Steel Rule

with Letter and

Number Drill Sizes

This practical shop rule has accurate, photo-

engraved graduations in 32nds and 64ths

with Quick-Reading figures on one side

The reverse side has letter sizes of drills

from A to Z with corresponding diameters in

thousandths and also number sizes from 1 to

80 with diameters in thousandths Made of

fine spring-tempered steel with no-glare satin

chrome finish

6" Steel Rule with Decimal Equivalents Width x Thickness Graduation Catalog No EDP 3/4" x 3/64" 10R – Quick-Reading 32nds and 64ths One Side andDecimal Equivalents on Reverse Side C622R-6 56660 6" Steel Rule with Letter and Number Drill Sizes 3/4" x 3/64" 10R – Quick-Reading 32nds and 64ths One Side andLetter and Number Drill Sizes on Reverse Side C623R-6 56661 24" Steel Folding-Rule with Circumference Measurement 3/4" x 1/32" 8ths and Circumference 8ths on One Side; 16ths onReverse Side 471 52483

471 Steel Folding Rule

with Circumference

Measurement

Tinsmiths and other mechanics appreciate this rule

because it measures diameters up to 24" as well as the

equivalent circumference measurement in direct-reading

circumference inches, up to 75" Entirely eliminates the

need for circumference calculations Made of fine, spring-

tempered steel and jointed at the center with two 12"

folds Photo-engraved graduations

414 Steel General Utility Rules – English Pattern Length Width x Thickness Graduation Catalog No EDP 12"

1-1/4" x 1/16" 8ths, 16ths of an Inch, Both Sides

414 Series Steel General

Utility Rules – English

Pattern

These tempered steel rules are designed to meet the

general-utility measuring needs of schools and shops,

wood-workers, tinsmiths, metalworkers, bench-work, etc

Photo-engraved graduations are heavier than conventional

machine-divided rules and easy to read The two edges on

both sides are graduated with the upper edges in 8ths and

the lower edges in 16ths of an inch A 1/4" hang-hole is on

one end

62 Rule Holder

EDP 50304

The Starrett 62 Rule Holder is designed

primarily for patternmakers, toolmakers and

machinists It will hold any rule or combination

square blade from 3/4 – 1-9/16" (19-

40mm) wide in an upright position for use

in transferring measurements with surface

gages, etc It is also handy for use as a depth

gage A large knurled clamp nut securely

locks the rule in the holder

The base is approximately 3-1/8" long and 2

1/2" wide (80 x 60mm) There is a depression

on each side for thumb and fingers for

handling convenience

Transferring measurements with a Starrett Surface Gage used in conjunction with rule and rule holder

423 Small Steel Rules with Holder Description Catalog No EDP Set of 5 Rules with Holder in Attractive, Protective Case S423Z 51524 1/4" Rule Only 423-1/4 70634 3/8" Rule Only 423-3/8 70635 1/2" Rule Only 423-1/2 70636 3/4" Rule Only 423-3/4 70637 1" Rule Only 423-1 70638 Holder Only 110 50475

423 Series Small

Steel Rules with

Holder

This set of five small rules is extremely useful

for measurements in confined or hard-to-

reach locations They are especially suitable

for measuring grooves, short shoulders,

recesses, keyways, and in tool and die work

The 4" long holder is well balanced The rules

are easily inserted in the slotted end of the

holder and are rigidly clamped in place by

a slight turn of a knurled nut Two slots are

provided, so the rules can be held at 30º or

45º, either square in a slot or tipped to one

side

Thicknesses up to 1/16" can be clamped in

either slot Rules are made of thin, spring-

tempered steel, with bright finish and highly

accurate, photo-engraved

graduations Each rule is graduated in 32nds

of an inch on one side and 64ths on the

reverse

Holder with 1" blade attached and 1/4, 3/8, 1/2, 3/4 blades