JIS B 1173 Specification

Scope

This Japanese Industrial Standard specifies the characteristics of the steel studs for general use (hereafter referred to as "studs").

Shape And Dimensions Of Stud

Shape And Dimensions Of Stud

Unit: mm

Nominal diameter of thread d 4 5 6 8 10 12 (14) 16 (18) 20
Pitch
p		 Coarse thread 0.7 0.8 1 1.25 1.5 1.75 2 2 2.5 2.5
Fine pitch thread --- --- --- --- 1.25 1.25 1.5 1.5 1.5 1.5
ds Max.(basic dimensions) 4 5 6 8 10 12 14 16 18 20
Min. 3.82 4.82 5.82 7.78 9.78 11.73 13.73 15.73 17.73 19.73
b That of
l ≤ 125 mm		 Min.      (basic dimensions) 14 16 18 22 26 30 34 38 42 46
Max. Coarse thread 15.4 17.6 20 24.5 29 33.5 38 42 47 51
Fine pitch thread --- --- --- --- 28.5 32.5 37 41 45 49
That of
l ≤ 125 mm		 Min.       (basic dimensions) --- --- --- --- --- --- --- --- 48 52
Max. Coarse thread --- --- --- --- --- --- --- --- 53 57
Fine pitch thread --- --- --- --- --- --- --- --- 51 55
bm Class 1 Min. --- --- --- --- 12 15 18 20 22 25
Max. --- --- --- --- 13.1 16.1 19.1 21.3 23.3 26.3
Class 2 Min. 6 7 8 11 15 18 21 24 27 30
Max. 6.75 7.9 8.9 12.1 16.1 19.1 22.3 25.3 28.3 31.3
Class 3 Min. 8 10 12 16 20 24 28 32 36 40
Max. 8.9 10.9 13.1 17.1 21.3 25.3 29.3 23.6 37.6 41.6
   re                                  (Approx.) 5.6 7 8.4 11 14 17 20 22 25 28
Nominal length l       Min.        Max. Preferable nominal length are given in the frame of
bold lines | those marked with * shall refer to Notee)|.
12 11.65 12.35 O* O* O*
14 13.65 14.35 O* O* O*
16 15.65 16.35 O* O* O* O*
18 17.65 18.35 O* O* O* O*
20 19.58 20.42 O* O* O* O* O*
22 21.58 22.42 O* O* O* O* O* O*
25 24.58 25.42 O* O* O* O* O* O* O*
28 27.58 28.42 O* O* O* O* O* O* O*
30 29.58 30.42 O* O* O* O* O* O* O*
Nominal length l       Min.        Max. Preferable nominal length are given in the frame of
bold lines | those marked with * shall refer to Notee)|.
32 31.5 32.5 O O O O O O* O* O* O*
35 34.5 35.5 O O O O O O* O* O* O* O*
38 37.5 38.5 O O O O O O O* O* O* O*
40 39.5 40.5 O O O O O O O* O* O* O*
45 44.5 45.5 O O O O O O O* O* O*
50 49.5 50.5 O O O O O O O* O*
55 54.4 55.6 O O O O O O O
60 59.4 60.6 O O O O O O
65 64.4 65.6 O O O O O O
70 69.4 70.6 O O O O O O
80 79.4 80.6 O O O O O O
90 89.3 90.7 O O O O O O
100 99.3 100.7 O O O O O O
110 109.3 110.7 O O
120 119.3 120.7 O O
140 139.2 140.8 O O
160 159.2 160.8 O O

NOTE 1 That of nominal diameter given in ( ) should not preferably be used as far as possible.
NOTE 2 See JIS B 1009 for the thread length on nut end side (b).
NOTE 3 For the thread length on stud end side (bm), whichever of Class 1, Class 2 and Class 3 shall be designated by the purchaser.
               Class 1 shall be equal to or nearly equal to 1.25d, Class 2 to 1.5d, and Class 3 to 2d.
             Class 1 and Class 2 are intended for the object studded into steel (including steel castings and steel forgings) or cast iron, and the                Class 3 is for light alloys.
NOTE 4 The end on stud end side shall be the chamfered end and the end on nut end side shall be the round end, and the shape and                dimensions thereof shall be in accordance with JIS B 1003.
Notes a) The dimensions x and u shall be the length of incomplete thread and 2 pitches or under.
           b) The straightness shall be as given in table 2.
           c) As those attached with * mark among the preferable nominal lengths are not capable of securing the specified thread length due to           the shortness of the nominal length (l), the thread length on nut end side may be made smaller than the minimum value of b of table 1             however, it shall not be made smaller than d+ 2P (d is the nominal designation of thread, and P is pitch, and the values of coarse thread             are used) given in table 3. In addition, the body length shall generally be La or over of table 3.

Measurement Of Straightness

Measurement Of Straightness

Nominal diameter of thread of d 4 5 6 8 10 12 14 16 18 20
Division of l Straightness l
Over Or under
--- 18 0.02 0.03 0.03 0.04 0.05 --- --- --- --- ---
18 30 0.03 0.03 0.04 0.05 0.05 0.06 0.07 0.08 0.08 0.08
30 50 0.06 0.06 0.06 0.07 0.07 0.08 0.08 0.09 0.10 0.10
50 80 --- --- --- 0.15 0.15 0.15 0.16 0.16 0.16 0.17
80 120 --- --- --- 0.32 0.33 0.33 0.33 0.33 0.33 0.33
120 160 --- --- --- --- --- --- --- --- 0.63 0.63

Minimum value of body length (la) excepting thread length on nut end side (b) and incomplete thread

Unit: mm

Nominal diameter of thread of d 4 5 6 8 10 12 14 16 18 20
d + 23P (=b) 5.4 6.6 8 10.5 13 14 18 20 23 25
la 1 2 2.5 3 4

Screw threads on stud end side

The screw threads on stud end side shall be the metric coarse threads or the metric fine pitch threads specified in JIS 0205-3, and the permissible dimensional deviations and tolerances thereof shall be as given in table 4. However, the case where the permissible dimensional deviations and tolerances other than table 4 are required for those on which the electroplating has been processed shall be in accordance with the designation of the purchaser.

Screw threads on nut end side

The screw threads on nut end side shall be the metric coarse threads or the metric fine pitch threads specified in JIS 0205-3, and the tolerance zone class thereof shall be 6g specified in JIS B 0209-3.
Further, the maximum permissible dimension of the screw threads on which the electroplating has been processed shall be the maximum permissible dimension of 4h.

Mechanical Properties

The studs shall be tested in accordance with 10.3, and the mechanical properties thereof shall be 4.8, 8.8, 9.8 and 10.9 in the property class of the mechanical properties specified in JIS B 1051

Material

The materials of studs shall be in accordance with JIS B 1051.

Surface Condition

The studs shall be inspected in accordance with 10.4, and the surface condition thereof shall be smooth and free from the detrimental defects in use such as cracks, flaws, burrs and rusts.

Surface Treatment

The surface treatment shall not generally be processed on the studs. When plating or other surface treatment is particularly required, it shall be in accordance with the designation of the purchaser.
The case where the electroplating is processed should preferably be in accordance with JIS B 1044.

Test And Inspection

Inspection on shape and dimensions

The inspection on the shape and dimensions of studs shall be carried out by the measurement in accordance withJIS B 1071 or an alterative method to this, and the results shall conform to the specification of clause 4.
The straightness of studs shall be of 1/2 the runout at the outer surface of body when the stud has been rotated once by arranging the flat plate, three wires for screw thread measuring or an alternative measuring instrument to this and the dial gauge as given in figure 1.

Inspection on screw threads

The inspection on the screw threads shall be in accordance with the following.
a) The screw threads on stud end side shall be measured by the direct measurement, screw threads limit gauges or an alternative inspecting instrument to this, and the results shall conform to the specification of 5.1 b) The screw threads of nut end side shall be measured in accordance with JIS B 1071 or an alternative method instead of this, and the results shall conform to the specification of 5.2.
Further, the go screw thread ring gauge for the screw threads on nut end side on which the electroplating has been processed shall be that of 4h.

Inspection on mechanical properties

The inspection on mechanical properties of studs shall be tested in accordance with the test programme B of JIS B 1051 according to the property class thereof, and the results shall conform to the specification of clause 6.

Inspection on surface condition

The surface condition of studs shall be inspected by the visual examination, and the results shall conform to the specification of clause 8.

Acceptance inspection

The acceptance inspection, unless particularly designated by the purchaser, shall be in accordance with JIS B 1091.

Designation of product

The designation of studs shall be in accordance with JIS B 1010.
When matters such as the shape of screw threads, the type of surface treatment are designated, they shall be added as the occasion demands.
Example 1 : For the stud of which the nominal designation of thread is M4, the nominal length is 20 mm, the property class is 4.8 and bm is                      Class 1: Stud JIS B 1173 -M4 x 20 -Coarse-Coarse-Class 1-4.8
Example 2 : For the stud of which the nominal designation of thread is MI0 (lefthand fine pitch threads on stud end side and fine pitch threads on                     nut end side), the nominal length is 50 mm, the property class is 8.8 and bm is Class 2:
                     Stud JIS B 1173-MI0x1.25-LHx50-Fine-Fine-Class 2-8.8
Example 3 For the stud of which the nominal designation of thread is M12 (coarse threads on stud end side and fine pitch threads on nut end                  side), the nominal length is 60 mm, the property class is 8.8, bm is Class 2 and the electroplating (A2K) is in accordance with
                      JIS B 1044: Stud JIS B 1173-M12 x 60-Coarse-Fine-Class 2-8.8-A2K 1)
Note 1)         For A2K, see Annex E of JIS B 1044.

Marking

Marking of product

The marking of product shall be in accordance with clause 9 of JIS B 1051.

Marking on packaging

The following matters shall be marked on the outer surface of package.
a) Number of this Standard or title of this Standard
b) Nomial diameter of thread x nominal length
c) Nominal designation of thread on stud end side (example: M10)
d) Class of bm or numeral value thereof(example: Class 2 or bm=18)
e) Nominal designation of thread on nut end side (example: M10 x 1.25)
f) Property class
g) Quantity
h) Designation matter (example: type of surface treatment)
i) manufacturer's name or its abbreviation

Premissible dimensional deviations and tolerance on screw threads on Stud end side of stud

Premissible dimensional deviations and tolerance on screw threads on Stud end side of stud

Unit: mm

Nominal diameter of thread (d) M4 M5 M6 M8 M10 M12 M14 M16 M18 M20
Coarse thread Major
diameter
d		 Basic dimension 4 5 6 8 10 12 14 16 18 20
Permissible
deviation		 Upper -0.03 -0.03 -0.03 -0.04 -0.04 -0.05 -0.05 -0.05 -0.05 -0.05
Lower -0.16 -0.17 -0.18 -0.21 -0.23 -0.24 -0.26 -0.26 -0.29 -0.29
Tolerance 0.13 0.14 0.15 0.17 0.19 0.19 0.21 0.21 0.24 0.24
Pitch
diameter
d2		 Basic dimension 3.545 4.480 5.350 7.188 9.026 10.863 12.701 14.701 16.376 18.376
Permissible
deviation		 Upper +0.06 +0.06 +0.07 +0.08 +0.08 +0.09 +0.10 +0.10 +0.11 +0.11
Lower 0 0 0 0 0 0 0 0 0 0
Tolerance 0.06 0.06 0.07 0.08 0.08 0.09 0.10 0.10 0.11 0.11
Minor
diameter
d1		 Basic dimension 3.242 4.134 4.917 6.647 8.76 10.106 11.835 13.835 15.294 17.294
Permissible
deviation		 Upper -0.041 -0.055 -0.147 -0.191 -0.244 -0.290 -0.333 -0.333 -0.432 -0.432
Lower -0.151 -0.175 -0.287 -0.361 -0.434 -0.510 -0.573 -0.573 -0.722 -0.722
Tolerance 0.11 0.12 0.14 0.17 0.19 0.22 0.24 0.24 0.29 0.29
Reference length of engagement 6 7 8 10 12 14 16 16 20 20
Nominal designation of thread (d) -- -- -- -- M10
x 1.25		 M12
x 1.25		 M14
x 1.5		 M16
x 1.5		 M18
x 1.5		 M20
x 1.5
Coarse thread Major
diameter
d		 Basic dimension -- -- -- -- 10 12 14 16 18 20
Permissible
deviation		 Upper -- -- -- -- -0.04 -0.04 -0.04 -0.04 -0.05 -0.05
Lower -- -- -- -- -0.19 -0.21 -0.21 -0.21 -0.22 -0.22
Tolerance -- -- -- -- 0.15 0.17 0.17 0.17 0.17 0.17
Pitch
diameter
d2		 Basic dimension -- -- -- -- 9.188 11.188 13.026 15.026 17.026 19.026
Permissible
deviation		 Upper -- -- -- -- +0.08 +0.09 +0.09 +0.09 +0.10 +0.10
Lower -- -- -- -- 0 0 0 0 0 0
Tolerance -- -- -- -- 0.08 0.09 0.09 0.09 0.10 0.10
Minor
diameter
d1		 Basic dimension -- -- -- -- 8.647 10.647 12.376 14.376 16.376 18.376
Permissible
deviation		 Upper -- -- -- -- -0.191 -0.191 -0.234 -0.234 -0.224 -0.224
Lower -- -- -- -- -0.361 -0.391 -0.434 -0.434 -0.474 -0.474
Tolerance -- -- -- -- 0.17 0.20 0.20 0.20 0.25 0.25
Standard length of engagement -- -- -- -- 6 10 10 10 15 15

In this table, the permissible deviations on the thread angle and pitch are not specified particularly, but these are included in the tolerances on the pitch diameter by converting into the pitch diameter. Therefore, as to the upper deviation of the pitch diameter in this table, the virtual pitch diameter shall be inspected using the measuring instrument or thread gauge having the reference length of engagement, and as to the lower permissible deviation of the pitch diameter, the simple pitch diameter shall be inspected.
NOTE: The tolerance zone class of the screw threads being engaged with those of table 4 should preferably be 5H specified in JIS B 0209-3.
Note a) The roundness of root may not necessarily be of an exact circular arc, but shall not be of an angular shape.

Normative Reference

The following standards contain provisions which, through reference in this text, constitute provisions of this Standard. The most recent editions of the standards (including amendments) indicated below shall be applied.
JIS B 0101 Screw threads and fasteners-Vocabulary
JIS B 0205-3 ISO general purpose metric screw threads-Part 3: Selected sizes for screws, bolts and nuts
JIS B 0209-3 ISO general purpose metric screw threads-Tolerances-Part 3: Deviationsfor constructional screw threads
JIS B 1010 Designation system for fasteners
JIS B 1044 Fasteners-Electroplated coatings
JIS B 1051 Mechanical properties of fasteners made of carbon steel and alloy steelPart 1: Bolts, screws and studs
JIS B 1071 Fasteners-Methods of verification for size and geometry
JIS B 1091 Fasteners-Acceptance inspection