Some standard content:
Guiding Technical Documents of the Ministry of Machinery and Electronics Industry of the People's Republic of China
JB/Z349—89
JB/T 9149-1999
Weight of Standard Fasteners
Data Special
Published on March 20, 1989
Published by the Ministry of Machinery and Electronics Industry
Part I
Calculation Method
Nuts·
Wood Screws
Self-tapping Screws,
Blocks·
Fasteners—Assemblies
Part II||t t||Reference weight table
Bolts·
Wood screws
Self-tapping screws
Retaining rings·
Fasteners-assemblies
（49）
（65)
Guiding technical documents of the Ministry of Machinery and Electronics Industry of the People's Republic of China
Weight of standard fasteners
This standard specifies the weight calculation method and reference weight of standard fasteners. This standard applies to fastener products specified in national standards. JB/Z 349--69
This standard gives the calculation method and reference weight according to the 11 major categories of fastener products in the national standard. In the calculation, unless otherwise specified, the following provisions shall be followed:
a. The weight of steel fasteners shall be calculated in units of 1000 pieces, and its density shall be 7800kg/m. b. If the product standard specifies the basic type and the type that can be manufactured, the weight shall be calculated according to the basic type. If the product standard specifies two or more types, only one of them shall be calculated. c. If the "nominal" size is specified in the dimension index, it shall be calculated according to the nominal value; if the max and min size are specified, it shall be calculated according to the min value. If only the max or IIIin is specified or the size without tolerance is specified, it shall be calculated according to the corresponding value. d. When the product specifies that the rod diameter of the unthreaded part can be made approximately equal to the thread pitch diameter or equal to the thread major diameter, it shall be calculated according to the rod diameter of the threaded part.
e. The rod diameter of the threaded part of the ordinary thread shall be calculated according to d. max (abbreviated as d in the formula) specified in JB/Z203--83 "Thread Rough Diameter" for 6g.
f. The size code in the calculation formula is consistent with the corresponding product standard. In the weight table, "d" is used to represent the "diameter specification" of the fastener. 9. For the convenience of calculation and use, the length specification in the reference weight table is greater than the specified range of the product standard. Part I Calculation Method
1 Bolts
1.1 Hexagonal head first-class thick rod (including rod or head with hole) 1.1.1 Applicable product standard number
GB5780, GB5782, GB5785, GB3].1, GB32.1, GB31.3 and GB32.3. 1.1.2 Volume
As shown in Figure 1, the bolt is divided into four parts: V1, V,, V and V. To simplify the calculation, the head is regarded as composed of a regular hexagonal prism (ignoring the chamfer) and a cylinder (washer surface); the cotter pin holes of the head or rod are regarded as cylinders, and their heights are Smin or the screw diameter (d.), and the end chamfer and r are ignored. Approved by the Ministry of Machinery and Electronics Industry on March 20, 19891
In the formula,
JB/Z 849--89
Vtotal=V++V,+V,+V
-d. (1-1) (mm) cylinder
d,2 (1-1g) -
-d,2·d. (mm) Subtracting 2 cylinders (GB31.1, GB 31.3)
dg2·1g (mm) Cylinder
: (KC) (mm) Regular hexagonal prism
_·K (mm3) Regular hexagonal prism (GB5780) (KC)-
-dw2, C (mm\) Cylinder
1.1.3 Thousand pieces weight
-d,2·2S (mm\) Regular hexagonal prism minus cylinder (GB32.1, GB32.3)
G=0.0078 V For full
, see Tables 1 to 7.
1.2 Hexagonal head full thread
1.2.1 Applicable product standard number
GB5781, GB5783, GB5786 and GB29.1. 1.2.2 Volume
As shown in Figure 2, the bolt is divided into three parts: V1, V, and V. To simplify the calculation, the head is regarded as consisting of a regular hexagonal prism (ignoring the chamfer) and a cylinder (washer surface); the slotted part of the head is regarded as a rectangular parallelepiped; the end chamfer and r are ignored. Vtotal=V+V2+V. (mm\)
Where:
d. 2.1 (mm3) Cylinder
, (K~C) (mm2) Regular hexagonal prism
e·K (mm°) Regular hexagonal prism GB (5781)4
(KC) -n·t·S (mm\) Regular hexagonal prism minus rectangular parallelepiped GB (29.1) V
1.2.3 Thousand pieces weight
See Tables 8 to 11.
JB/Z 349-89
dw2.C（mms）Cylinder
(GB5981)
G=0.0078Vfull
1.3 Hexagonal head-thin rod (including rod or head with hole) 1.3.1 Applicable product standard number
GB 5784, GB29.2, GB 31.2 and GB32.2. 1.3.2 Volume
Vs-four holes
As shown in Figure 3, the bolt is divided into three parts: V1, V, and V,. To simplify the calculation, the head is regarded as a regular hexagonal prism, the concave part is regarded as a cylinder, the cross groove part is a half-cone of a truncated cone, and the cotter pin hole of the head or rod is regarded as a cylinder, and its height is the screw diameter (d.), and r is ignored.
Vtotal=V,+V,-V,(mm\)
Wherein:
d,.1（mm\）cylinder
d12，d.（mm3）subtraction of 2 cylinders（GB32.1）e·K（mm2）regular hexagonal prism
2.5981 ·
dl·2S（mm3）regular hexagonal prism minus cylinder（GB32.2）(m*+6mg+9g*) -\g2
Hinsert
（mm2）half the volume of regular hexagonal prism minus frustum and instantaneous cone（GB29.2）V,r
1.3.3For piece weight
see Table 12 to Table 15.
1.4 Hexagonal head-flange-
(0.9S)2,025K(mm2)cylinderG=0.0078Vfull
First-class thick rod
1.4.1 Applicable product standard number
GB 5787 and GB 5789.
1.4.2 Volume
JB/Z349—89
V, concave
As shown in Figure 4, the bolt is divided into five parts: V, V,, V., V and V,. To simplify the calculation, the flange part is regarded as a truncated cone and the rest is regarded as a regular hexagonal prism minus a cylinder (concave), and the chamfer (head and end) and r are ignored. Vfull=V +V +V. +V,-V
Where:
d.(1-1s)(mms)Cylinder
(mm\)Cylinder
dgS. tg20° (
(d.-S) tg20°(d.2 +S2+d.. S)tg20°(d.8-S)(mm)Frustum
V, =2.5981 +
1.4.3 Thousand pieces weight
See Table 16 to Table 17.
—·(K-ds_Stg20') (mm2) Regular hexagonal prism e?
(0.9S)2.0.25K (mm3) Cylinder G=0.0078V
1.5 Hexagonal head-flange surface-thin rod
1.5.1 Applicable product standard number
GR 5788 and GB 5790.
1.5.2 Volume
Vs-recess
As shown in Figure 5, the bolt is divided into five parts: V1, V,, V,, V, and V. To simplify the calculation, the flange part is regarded as a truncated cone and the rest is regarded as a regular hexagonal prism minus a cylinder (recess). The chamfer (head and end) is ignored. Vtotal=V+V,+V,+VV,(mm)
Where:
1.5.3 Thousand pieces weight
See Table 18 to Table 19.
JB/Z 849--89
d,2 (td)
（mm8）Cylinder
d2.d (mm3) cylinder
tg20° (d.3-S) (mm) truncated cone
doStg20°) (mm2) regular hexagonal prism
V,=2.5981
(0.9S) 2.0.25K (mm3) cylinder G=0.0078V barrier (kg)
1.6 Hexagonal head for reaming holes (including shank with holes) 1.6.1 Applicable product standard number
GB 27 and GB 28.
1.6.2 Volume
As shown in Figure 6, the bolt is divided into four parts: V1, V., V, and V. To simplify the calculation, the head is regarded as a regular hexagonal prism, the chamfer (head and end) is ignored, and the cotter pin hole of the shank is regarded as a cylinder, the height of which is the screw diameter (d.), and r is ignored. Vtotal=V++V,+V,+V,
Wherein:
-d,2(1-1,-13)
d2 (1-1,-13)
（mm）Cylinder
di.\.d。
Cylinder minus cylinder (GB28)
V,=2.5981 .
1.6.3Weight of 1,000 pieces
G=0.0078Vtotal
See Table 20 to Table 21.
1.7Square head
1.7.1Applicable product standard number
GB8 and GB35.
（mm\）Cylinder
（mm\）Cylinder
（mm3）Regular hexagonal prism
1.7.2 Volume
JB/Z 349—89
As shown in Figure 7, the bolt is divided into two parts, V, and V,. To simplify the calculation, the head is regarded as a cube (ignoring the chamfer), and r is ignored.
Vtotal=V1+V,
Where:
Weight in thousand pieces
See Table 22 to Table 23.
1.8 Countersunk head
1.8.1 Applicable product standard number
G= 0.0078Vtotal
GB 10, GB11 and GB800.
1.8.2 Volume
（mm）Cylinder
（mm2）Cube
V,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,61,62,63,48,49,52,53,54,55,56,57,60,61,62,63,49,58,40,59,61,64,65,47,48,49,50,61,62,63,48,49,51,64,48,49,52,65,48,49,53,40,41,42,43,44,48,49,50,61,62,63,42,43,4 ...3,42,43,44,48,49,51,64,48,49,53,40,40,41,42,43,44,48,49,51,64,48, 6
（mm\）Front table
1.8.3Weight of 1,000 pieces
See Table 24 to Table 26.
1.9Semi-round head square neck
1.9.1Applicable product standard number
JB/Z 349-89
sin45°
G= 0.0078Vfull
GB 12, GB 14, GB 801.
1.9.2Volume
(mm）Blue prism
(mm)Triangular prism (GB800)
(GB10)
As shown in Figure 9, the bolt is divided into three parts: V1, V2, and V3. For the sake of calculation, r is ignored. Vtotal=V+V,+V.
Wherein,
1.9.3 Dry weight
See Table 27 to Table 29.
1.10 Half-round head belt sample
1.10.1 Applicable product standard number
GB 13 and GB 15.
1.10.2 Volume
d(1-K)
V,= Ss-Ki
（mm）Cylinder
（㎡m）Cube
K2(3R-K)
G= 0.0078V full
Va— sample
mm\）Spherical crown
JB/Z349—89
As shown in Figure 10, the bolt is divided into four parts: V,, Vz, V and V,. To simplify the calculation, GB13 is regarded as a triangular prism; GB15 is regarded as a regular tetrahedron; r is ignored. V gold = Vi+V,+Vs+V.
Where:
1.10.3 Weight of one thousand pieces
See Table 30 and Table 31.
d (1-h)
（mm\）Cylinder
（mm2）Cylinder（GB15）
（mm2）Cylinder
（GB 15)
K2(3R-K)
d-1-ds.hi·Sn
01176×0707hs
G=0.0078Vfull
1.11.1Applicable product standard number
GB 37.
1.11.2Volume
（mm）Spherical crown
（mm3）Triangular prism
（mm）Regular tetrahedron.（GB15）
As shown in Figure 11, the bolt is divided into four parts: V1, V2, V. and V. To simplify the calculation, the chamfered part of the head is regarded as a cylinder with a diameter equal to (D+D,)2, and the end chamfer and r are ignored. Vtotal=Vi+V++V=+V4
In the formula:
In the formula:
Among them:
·(b+X)
- d (1-bX)
V,=V.'+V.\
（mm）Cylinder
（mm\）Cylinder
（mm\）Rectangular block plus 2 arches
Vs'-S.VD2-S2.h
Ve#=2S surface·h
S arch surface=r (Sb)
（mm）Rectangular block
S arch surface is the area of the arch
Thousand pieces of smoked quantity
See Table 32.
1.12 Joints
1.121 Applicable product standard number
GB798.
1.122 Volume
JB/Z 349—89
180×2
-S) +S. D-VD-S*
-S) +S.(D- VDI-S)
-aresing
-ShVDt-ST+2·H
+S(D-VDr-ST) 1.
(D+D)*. (Kh)
(D+0.95S)2(Kh)
G=0.0078V Full
（mm\） Cylinder
As shown in Figure 12, the bolt is divided into three parts: V, V, and V. To simplify the calculation, the bolt head is regarded as consisting of a sphere minus 2 spherical crowns, and the chamfer and r are ignored.
V total = V1+V,-V.
Where:
Weight in thousands of pieces
See Table 33.
\--d(1-No.)
（mm）Cylinder
V.-(D) \_2:\ (DS)
(DS) 2
(2D+S、
- D3- n (DS).
G= 0 0078V total
（mm3）Cylinder
（mm\）Sphere minus 2 spherical crowns
1.6.3Weight of Thousand Pieces
G=0.0078Vtotal
See Table 20-21.
1.7Square Head
1.7.1Applicable Product Standard Numbers
GB8 and GB35.
(mm\)Cylinder
(mm\)Cylinder
(mm3)Regular Hexagonal Prism
1.7.2Volume
JB/Z 349—89
As shown in Figure 7, the bolt is divided into two parts, V, and V,. To simplify the calculation, the head is regarded as a cube (ignore the chamfer) and r is ignored.
Vtotal=V1+V,
Where:
Weight of Thousand Pieces
See Table 22-23.
1.8 Countersunk
1.8.1 Applicable product standard number
G= 0.0078Vfull
GB 10, GB11 and GB800.
1.8.2 Volume
(mm) Cylinder
(mm2) Cube
V,1.8.2 Volume ... Vtotal=V,+V，+V3
d.1 (1-K)
(mma）Cylinder
+Ss; d)
(mm\)Frustum
Kdiktga+K*tg*a)
where a is in accordance with the corresponding standard (a=37.5°, GB11, a=45°, GB800). 6
(mm\)Frustum
1.8.3Thousand pieces weight
See Table 24 to Table 26.
1.9 Half round head square neck
1.9.1 Applicable product standard number
JB/Z 349-89
sin45°
G= 0.0078Vfull
GB 12, GB 14, GB 801.
1.9.2 Volume
(mm) Blue prism
(mm) Triangular prism (GB800)
(GB10)
As shown in Figure 9, the bolt is divided into three parts: V1, V, and V. For the sake of calculation, r is ignored. Vfull=V+V,+V.
Wherein,
1.9.3 Dry weight
See Tables 27 to 29.
1.10 Half round head with sample
1.10.1 Applicable product standard number
GB 13 and GB 15.
1.10.2 Volume
d(1-K)
V,= Ss-Ki
（mm）Cylinder
（㎡m）Cube
K2(3R-K)
G= 0.0078V Full
Va—sample
mm\）Spherical crown
JB/Z349—89
As shown in Figure 10, the bolt is divided into four parts: V,, Vz, V and V,. To simplify the calculation, the GB13 is regarded as a triangular prism; the GB15 sample is regarded as a regular tetrahedron; r is ignored. Vgold=Vi+V,+Vs+V.
Where:
1.10.3Thousand pieces weight
See Table 30 and Table 31.
d (1-h)
(mm\)Cylinder
(mm2)Cylinder (GB15)
(mm2)Cylinder
(GB 15)
K2(3R-K)
d-1-ds.hi·Sn
01176×0707hs
G=0.0078VFull
1.11.1Applicable product standard number
GB 37.
1.11.2 Volume
(mm) Spherical crown
(mm3) Triangular prism
(mm) Regular tetrahedron. (GB15)
As shown in Figure 11, the bolt is divided into four parts: V1, V2, V. and V. To simplify the calculation, the chamfered part of the head is regarded as a cylinder with a diameter equal to (D+D,)2, and the end chamfer and r are ignored. Vtotal=Vi+V++V=+V4
In the formula:
In the formula:
Among them:
·(b+X)
- d (1-bX)
V,=V.'+V.\
（mm）Cylinder
（mm\）Cylinder
（mm\）Rectangular block plus 2 arches
Vs'-S.VD2-S2.h
Ve#=2S surface·h
S arch surface=r (Sb)
（mm）Rectangular block
S arch surface is the area of the arch
Thousand pieces of smoked quantity
See Table 32.
1.12 Joints
1.121 Applicable product standard number
GB798.
1.122 Volume
JB/Z 349—89
180×2
-S) +S. D-VD-S*
-S) +S.(D- VDI-S)
-aresing
-ShVDt-ST+2·H
+S(D-VDr-ST) 1.
(D+D)*. (Kh)
(D+0.95S)2(Kh)
G=0.0078V Full
（mm\） Cylinder
As shown in Figure 12, the bolt is divided into three parts: V, V, and V. To simplify the calculation, the bolt head is regarded as consisting of a sphere minus 2 spherical crowns, and the chamfer and r are ignored.
V total = V1+V,-V.
Where:
Weight in thousands of pieces
See Table 33.
\--d(1-No.)
（mm）Cylinder
V.-(D) \_2:\ (DS)
(DS) 2
(2D+S、
- D3- n (DS).
G= 0 0078V total
（mm3）Cylinder
（mm\）Sphere minus 2 spherical crowns
1.6.3Weight of Thousand Pieces
G=0.0078Vtotal
See Table 20-21. wwW.bzxz.Net
1.7Square Head
1.7.1Applicable Product Standard Number
GB8 and GB35.
(mm\)Cylinder
(mm\)Cylinder
(mm3)Regular Hexagonal Prism
1.7.2Volume
JB/Z 349—89
As shown in Figure 7, the bolt is divided into two parts, V, and V,. To simplify the calculation, the head is regarded as a cube (ignore the chamfer) and r is ignored.
Vtotal=V1+V,
Where:
Weight of Thousand Pieces
See Table 22-23.
1.8 Countersunk
1.8.1 Applicable product standard number
G= 0.0078Vfull
GB 10, GB11 and GB800.
1.8.2 Volume
(mm) Cylinder
(mm2) Cube
V,1.8.2 Volume ... Vtotal=V,+V，+V3
d.1 (1-K)
(mma）Cylinder
+Ss; d)
(mm\)Frustum
Kdiktga+K*tg*a)
where a is in accordance with the corresponding standard (a=37.5°, GB11, a=45°, GB800). 6
(mm\)Frustum
1.8.3Thousand pieces weight
See Table 24 to Table 26.
1.9 Half round head square neck
1.9.1 Applicable product standard number
JB/Z 349-89
sin45°
G= 0.0078Vfull
GB 12, GB 14, GB 801.
1.9.2 Volume
(mm) Blue prism
(mm) Triangular prism (GB800)
(GB10)
As shown in Figure 9, the bolt is divided into three parts: V1, V, and V. For the sake of calculation, r is ignored. Vfull=V+V,+V.
Wherein,
1.9.3 Dry weight
See Tables 27 to 29.
1.10 Half round head with sample
1.10.1 Applicable product standard number
GB 13 and GB 15.
1.10.2 Volume
d(1-K)
V,= Ss-Ki
（mm）Cylinder
（㎡m）Cube
K2(3R-K)
G= 0.0078V Full
Va—sample
mm\）Spherical crown
JB/Z349—89
As shown in Figure 10, the bolt is divided into four parts: V,, Vz, V and V,. To simplify the calculation, the GB13 is regarded as a triangular prism; the GB15 sample is regarded as a regular tetrahedron; r is ignored. Vgold=Vi+V,+Vs+V.
Where:
1.10.3Thousand pieces weight
See Table 30 and Table 31.
d (1-h)
(mm\)Cylinder
(mm2)Cylinder (GB15)
(mm2)Cylinder
(GB 15)
K2(3R-K)
d-1-ds.hi·Sn
01176×0707hs
G=0.0078VFull
1.11.1Applicable product standard number
GB 37.
1.11.2 Volume
(mm) Spherical crown
(mm3) Triangular prism
(mm) Regular tetrahedron. (GB15)
As shown in Figure 11, the bolt is divided into four parts: V1, V2, V. and V. To simplify the calculation, the chamfered part of the head is regarded as a cylinder with a diameter equal to (D+D,)2, and the end chamfer and r are ignored. Vtotal=Vi+V++V=+V4
In the formula:
In the formula:
Among them:
·(b+X)
- d (1-bX)
V,=V.'+V.\
（mm）Cylinder
（mm\）Cylinder
（mm\）Rectangular block plus 2 arches
Vs'-S.VD2-S2.h
Ve#=2S surface·h
S arch surface=r (Sb)
（mm）Cuboid
S arch surface is the area of the arch
Thousand pieces of smoked quantity
See Table 32.
1.12 Joints
1.121 Applicable product standard number
GB798.
1.122 Volume
JB/Z 349—89
180×2
-S) +S. D-VD-S*
-S) +S.(D- VDI-S)
-aresing
-ShVDt-ST+2·H
+S(D-VDr-ST) 1.
(D+D)*. (Kh)
(D+0.95S)2(Kh)
G=0.0078V Full
（mm\） Cylinder
As shown in Figure 12, the bolt is divided into three parts: V, V, and V. To simplify the calculation, the bolt head is regarded as consisting of a sphere minus 2 spherical crowns, and the chamfer and r are ignored.
V total = V1+V,-V.
Where:
Weight in thousands of pieces
See Table 33.
\--d(1-No.)
（mm）Cylinder
V.-(D) \_2:\ (DS)
(DS) 2
(2D+S、
- D3- n (DS).
G= 0 0078V total
（mm3）Cylinder
（mm\）Sphere minus 2 spherical crowns2 Volume
(mm) Blue prism
(mm) Triangular prism (GB800)
(GB10)
As shown in Figure 9, the bolt is divided into three parts: V1, V, and V. For the sake of simplicity, r is ignored. Vtotal = V+V,+V.
Wherein,
1.9.3 Dry weight
See Table 27 to Table 29.
1.10 Half round head strip sample
1.10.1 Applicable product standard number
GB 13 and GB 15.
1.10.2 Volume
d(1-K)
V,= Ss-Ki
（mm）Cylinder
（㎡m）Cube
K2(3R-K)
G= 0.0078V full
Va— sample
mm\）Spherical crown
JB/Z349—89
As shown in Figure 10, the bolt is divided into four parts: V,, Vz, V and V,. To simplify the calculation, GB13 is regarded as a triangular prism; GB15 is regarded as a regular tetrahedron; r is ignored. V gold = Vi+V,+Vs+V.
Where:
1.10.3 Weight of one thousand pieces
See Table 30 and Table 31.
d (1-h)
（mm\）Cylinder
（mm2）Cylinder（GB15）
（mm2）Cylinder
（GB 15)
K2(3R-K)
d-1-ds.hi·Sn
01176×0707hs
G=0.0078Vfull
1.11.1Applicable product standard number
GB 37.
1.11.2Volume
（mm）Spherical crown
（mm3）Triangular prism
（mm）Regular tetrahedron.（GB15）
As shown in Figure 11, the bolt is divided into four parts: V1, V2, V. and V. To simplify the calculation, the chamfered part of the head is regarded as a cylinder with a diameter equal to (D+D,)2, and the end chamfer and r are ignored. Vtotal=Vi+V++V=+V4
In the formula:
In the formula:
Among them:
·(b+X)
- d (1-bX)
V,=V.'+V.\
（mm）Cylinder
（mm\）Cylinder
（mm\）Rectangular block plus 2 arches
Vs'-S.VD2-S2.h
Ve#=2S surface·h
S arch surface=r (Sb)
（mm）Rectangular block
S arch surface is the area of the arch
Thousand pieces of smoked quantity
See Table 32.
1.12 Joints
1.121 Applicable product standard number
GB798.
1.122 Volume
JB/Z 349—89
180×2
-S) +S. D-VD-S*
-S) +S.(D- VDI-S)
-aresing
-ShVDt-ST+2·H
+S(D-VDr-ST) 1.
(D+D)*. (Kh)
(D+0.95S)2(Kh)
G=0.0078V Full
（mm\） Cylinder
As shown in Figure 12, the bolt is divided into three parts: V, V, and V. To simplify the calculation, the bolt head is regarded as consisting of a sphere minus 2 spherical crowns, and the chamfer and r are ignored.
V total = V1+V,-V.
Where:
Weight in thousands of pieces
See Table 33.
\--d(1-No.)
（mm）Cylinder
V.-(D) \_2:\ (DS)
(DS) 2
(2D+S、
- D3- n (DS).
G= 0 0078V total
（mm3）Cylinder
（mm\）Sphere minus 2 spherical crowns2 Volume
(mm) Blue prism
(mm) Triangular prism (GB800)
(GB10)
As shown in Figure 9, the bolt is divided into three parts: V1, V, and V. For the sake of simplicity, r is ignored. Vtotal = V+V,+V.
Wherein,
1.9.3 Dry weight
See Table 27 to Table 29.
1.10 Half round head strip sample
1.10.1 Applicable product standard number
GB 13 and GB 15.
1.10.2 Volume
d(1-K)
V,= Ss-Ki
（mm）Cylinder
（㎡m）Cube
K2(3R-K)
G= 0.0078V full
Va— sample
mm\）Spherical crown
JB/Z349—89
As shown in Figure 10, the bolt is divided into four parts: V,, Vz, V and V,. To simplify the calculation, GB13 is regarded as a triangular prism; GB15 is regarded as a regular tetrahedron; r is ignored. V gold = Vi+V,+Vs+V.
Where:
1.10.3 Thousand pieces of weight
See Table 30 and Table 31.
d (1-h)
（mm\）Cylinder
（mm2）Cylinder（GB15）
（mm2）Cylinder
（GB 15)
K2(3R-K)
d-1-ds.hi·Sn
01176×0707hs
G=0.0078Vfull
1.11.1Applicable product standard number
GB 37.
1.11.2Volume
（mm）Spherical crown
（mm3）Triangular prism
（mm）Regular tetrahedron.（GB15）
As shown in Figure 11, the bolt is divided into four parts: V1, V2, V. and V. To simplify the calculation, the chamfered part of the head is regarded as a cylinder with a diameter equal to (D+D,)2, and the end chamfer and r are ignored. Vtotal=Vi+V++V=+V4
In the formula:
In the formula:
Among them:
·(b+X)
- d (1-bX)
V,=V.'+V.\
（mm）Cylinder
（mm\）Cylinder
（mm\）Rectangular block plus 2 arches
Vs'-S.VD2-S2.h
Ve#=2S surface·h
S arch surface=r (Sb)
（mm）Rectangular block
S arch surface is the area of the arch
Thousand pieces of smoked quantity
See Table 32.
1.12 Joints
1.121 Applicable product standard number
GB798.
1.122 Volume
JB/Z 349—89
180×2
-S) +S. D-VD-S*
-S) +S.(D- VDI-S)
-aresing
-ShVDt-ST+2·H
+S(D-VDr-ST) 1.
(D+D)*. (Kh)
(D+0.95S)2(Kh)
G=0.0078V Full
（mm\） Cylinder
As shown in Figure 12, the bolt is divided into three parts: V, V, and V. To simplify the calculation, the bolt head is regarded as consisting of a sphere minus 2 spherical crowns, and the chamfer and r are ignored.
V total = V1+V,-V.
Where:
Weight in thousands of pieces
See Table 33.
\--d(1-No.)
（mm）Cylinder
V.-(D) \_2:\ (DS)
(DS) 2
(2D+S、
- D3- n (DS).
G= 0 0078V total
（mm3）Cylinder
（mm\）Sphere minus 2 spherical crowns
G= 0 0078V full
(mm3) cylinder
(mm\) sphere minus 2 spherical crowns
G= 0 0078V full
(mm3) cylinder
(mm\) sphere minus 2 spherical crowns
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