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Page 1

COPYRIGHT 2003; American Society of Mechanical Engineers


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Page 2

The American Society of
Mechanical Engineers

A N A M E R I C A N N A T I O N A L S T A N D A R D

CLEARANCE HOLES
FOR BOLTS, SCREWS,

AND STUDS

ASME B1 8.2.8-1 NUN
COPYRIGHT 2003; American Society of Mechanical Engineers


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Page 7

CORRESPONDENCE WITH THE B18 COMMITTEE

Genertrl. ASME Standards are developed and maintained with the intent to represent the
consensus of concerned interests. As such, users of this Standard may interact with the
Committee by requesting interpretations, proposing revisions, and attending Committee
meetings. Correspondence should be addressed to:

Secretary, B 18 Main Committee
The American Society of Mechanical Engineers
Three Park Avenue
New York, NY IOOl6-5990

Proposing Revisions. Revisions are made periodically to the Standard to incorporate
changes that appear necessary or desirable, as demonstrated by the experience gained from
the application of the Standard. Approved revisions will be published periodically.

The Cornmittee welcomes proposals for revisions to this Standard. Such proposals should
be as specific as possible, citing the paragraph number(s), the proposed wording, and a
detailed description of the reasons for the proposal, including any pertinent documentation.

Interpretations. Upon request, the B18 Committee will render an interpretation of any
requirement of the Standard. Interpretations can only be rendered in response to a written
request sent to the Secretary of the B18 Main Committee.

The request for interpretation should be clear and unambiguous. It is further recommended
that the inquirer submit hisher request i n the following format:

Subject: Cite the applicable paragraph number(s) and the topic of the inquiry.
Edition: Cite the applicable edition of the Standard for which the interpretation

is being requested.
Question: Phrase the question as a request for an interpretation of a specific

requirement suitable for general understanding and use, not as a request
for an approval of a proprietary design or situation. Thc inquirer may
also include any plans or drawings, which are necessary to explain
the question; however, they should not contain proprietary names or
information.

Requests that are not in this format may be rewritten in the appropriate format by the
Committee prior to being answered, which may inadvertently change the intent of the
original request.

ASME procedures provide for reconsideration of any interpretation when or if additional
information that might affect an interpretation is available. Further, persons aggrieved by
an interpretation may appeal to the cognizant ASME Committee or Subcommittee. ASME
does not “approve,” “certify,” “rate,” or “endorse” any item, construction, proprietary device,
or activity.

Attending Committee Meetings. The B I 8 Main Committee regularly holds meetings, which
are open to thc public. Persons wishing to attend any meeting should contact the Secretary
of the B 18 Main Committee.

COPYRIGHT 2003; American Society of Mechanical Engineers


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Page 8

STD-ASME B18-2-8-ENGL 1999 W 0759b70 Ob13270 22b W

CONTENTS

...
Foreword . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111
Committee Roster . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . v
Committee Correspondence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . vii

1 Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I

2 Comparison With IS0 Standards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
2. I Metric Fasteners . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I
2.2 lnch Fasteners . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

3 Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I
3.1 Inch Fasteners . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
3.2 Metric Fasteners . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
3.3 Tolerances . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
3.4 Clearances . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Tables
1 Inch Clearance Hole Allowances . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
2 Clearance Holes for lnch Fasteners . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
3 Clearance Holes for Metric Fasteners . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
4 Metric Clearance Hole Allowances . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Mandatory Appendix
I Nonsystem Drills . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

ix

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Page 13

STD-ASME BLB-2-8-ENGL L777 E 0759b70 Ob113275 808

ASME B18.2.8-1999

MANDATORY APPENDIX I
NONSYSTEM DRILLS

1-1 RECOMMENDED SUBSTITUTE DRILLS

I f the clearance hole application is dimensioned in
metric drill sizes for inch fasteners or inch drill sizes
for metric fasteners, Tables 1-1 and 1-2 list the nearest
standard drill size translations for the designated drills
of Tables 2 and 3.

TABLE 1-1 STANDARD METRIC DRILLS FOR
INCH FASTENERS

Nominal Drill Size, mm

Fit Classes Nominal
Screw Size, in. Normal Close Loose

#O 1.9 1.7 2.4
#1 2.25 2.05 2.6
#2 2.6 2.4 2.9

#3 2.9 2.7 3.3
#4 3.3 3 3.7
#5 4 3.6 4.4

#6 4.3 3.9 4.7
#8 5 4.6 5.4
#10 5.6 5.2 6

'14 7.1 6.7 7.5
v1 5 8.7 8.3 9.1
'ln 10.2 9.9 10.5

7/1 5 11.8 11.5 12.2
'12 14.25 13.5 15.5
"8 17.5 16.75 19

"4 20.5 20 23
'/n 24 23 26

178 31 29.5 33.5
1 v4 34 32.5 36.5
1 '18 38 36.5 41

1 Y2 41 39.5 44

1 27.5 26 29.5

TABLE 1-2 STANDARD INCH DRILLS FOR
METRIC FASTENERS

Nominal Drill Size, in.

Nominal Fit Classes

Screw Size, m m Normal Close Loose

M1.6
M2
M2.5

M3
M4
M5

M 6
M 8
M10

M12
M14
M16

M20
M24
M30

M36
M42
M48

M56
M64
M72

#50

#33

#29
#16

3
132

7/32

G
T
'4 6
17

39
13 2

164
1/32

55
164

1 1/32
9/32

1
1 'v32
2 '132

2'4 6

3118
Z3/4

#51
#44
#36

'18
#19
#4

114
Q
Z

33

19

43

164

13 2

164

53164
63 164
1 7/32

1'732

1 "176
1 31/32

2 7 1 6

278
2'%6

#47
#38
#3 1

#12
#1

J

/sa

9/64

25

31
164

37
164

"132
47

164

17-
1 318

1 '132
1 29/32
2'4 6

2518

3114
2% 6

5

COPYRIGHT 2003; American Society of Mechanical Engineers


Document provided by IHS Licensee=Purdue Univ/5923082001, User=, 08/26/2003
18:32:52 MDT Questions or comments about this message: please call the Document
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Page 14

COPYRIGHT 2003; American Society of Mechanical Engineers


Document provided by IHS Licensee=Purdue Univ/5923082001, User=, 08/26/2003
18:32:52 MDT Questions or comments about this message: please call the Document
Policy Group at 1-800-451-1584.

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