This standard specifies the tolerances and surface roughness of equal-length studs, studs, hexagonal bolts, hexagonal flange bolts, hexagonal nuts, cover nuts and load-bearing sleeves with a nominal diameter of dw = 21 ~ 270 with thread specifications of M12 ~ 180 × 6 and product grades of TA, TB and TC. This standard is applicable to fasteners used under working conditions that can withstand high temperatures and alternating loads and maintain preload and fatigue resistance to a considerable extent. GB/T 3103.4-1992 Fastener Tolerances Heat-resistant Threaded Connections GB/T3103.4-1992 Standard Download Decompression Password: www.bzxz.net

National Standard of the People's Republic of China
Fasteners Tolerances Heat-resistant threaded connections
Tolerances for fasteners-Components for bolted connectlonsmade mainly with a high temperature strengthMain content and scope of application
GB/T 3103. 4-92
This standard specifies the tolerances and surface roughness of equal-length studs, studs, hexagonal bolts, hexagonal flange bolts, hexagonal nuts, cap nuts and load-bearing sleeves with a nominal diameter of d-21 to 270 with thread specifications of M12 ~ 180 X 6 and product grades of TA, TB and TC.
This standard is applicable to fasteners used under working conditions that can withstand high temperatures and alternating loads and must maintain preload and heat resistance strength to a considerable extent.
Note: The product grade is determined by the product quality and tolerance size, TA grade is the most accurate and TC grade is the least accurate. Reference standards
GB192 Basic tooth profile of common thread
Basic dimensions of common thread
Tolerances and fits of common thread
GB5782 Hexagon head bolts Grade A and Grade B
GB 61701 Hexagon nuts Grade A and Grade B
3 Surface roughness
The surface roughness is shown in Table 1.
Surface roughness R,
Bearing surface
Transition between stem and
Thread
Nucleus
Wrench surface
Approved by the State Bureau of Technical Supervision on November 5, 1992
Process determination
Process determination
Implementation on June 1, 1993
Directional hole
Other surfaces
4 Thread
4.1 Large clearance fit
GB/T 3103.4—92
Continued Table 1
Surface roughness R,
4.1.1 The types and sizes of common threads for large clearance fit are shown in Table 2. Table 2
Tooth type and basic dimensions
Internal thread (nut)
External thread (bolt, stud)
Product grade
According to GB192 and GB196, the root shape of the external thread shall be in accordance with Chapter 10 of GB197 6H GB 197
The limit deviations of the major diameter and the middle diameter of the thread are in accordance with Table 3; Grade 6 tolerance, such as GB5782 octagonal head bolts with large European ordinary threads specified in this table, and used in conjunction with GB 61701 hexagonal nuts, due to the large thread glands, it is necessary to consider reducing the stripping strength of the threaded connection pair. According to the use requirements, the external or internal threads with clearance fit can be made into tapered threads, and the taper is agreed upon by the supply and demand parties. 4.1.2
4.1.3 Marking
Marking of large-gap ordinary thread (external thread) with thread specification of M30: Thread GB/T3103.4M30
External thread middle diameter d
Thread specification
M36M39
Upper deviation
—177
Lower deviation
—327
Upper deviation
—200
—212
External Thread major diameter
Lower deviation
—442
—457
—535
Thread specification
M64~M90X6
M100X6~M120×6
-M125×6~M150X6
'M160×6~M180X6
4.26H/6g fit
Upper deviation
—531
GB/T 3103. 4—92
Continued Table 3
External thread pitch diameter
Lower deviation
Upper deviation
—250
—265
External thread major diameter &
Lower deviation
-1 072
The basic dimensions of TA, TB and TC grade threads shall comply with the provisions of GB196; the tolerance zone shall comply with the provisions of GB197 for 6H (internal thread) and 6g (external thread).
5 Dimension tolerance
Dimension tolerance is shown in Table 4. The illustration is for example only and is also applicable to other types of bolts and nuts. Table 4
5.1 Equal length studs
t(L and type)
(SD and A)
Difference, mm
Product grade
5.2 Studs (waisted rod or equal thick rod)
GB/T 3103.4—92
Continued Table 4
The tolerance of equal thick rod b is -1.5P(—--bolt 1)Figure 2
5.3 Bolts (waisted rod or equal thick rod)
5.4 Nuts
5.4.1 Hexagonal nuts
No potential surface
With washer surface
Difference, mm
Product grade
d wmin =Smin IT15
emn21. 13Smin
eming:l. 13 Smin
h13 S≤30
h14 $>30www.bzxz.net
5.4.2 Cover nut
5.5 Load-bearing casing
6 Form and position tolerances
Surface without gasket
GB/T 3103. 4—92
Continued Table 4
Surface with gasket
The form and position tolerances are shown in Table 5. Geometric tolerances are independent of manufacturing process, measurement or test methods. Tolerances, mm. Product grade. Enuin1. 13 Smuo. h13530. h14 $>30. tt. 6. 1 Coaxiality, symmetry. GB/T 3103. 492
Basis for selecting tolerance
t||Product grade
(Applicable only to Figure 10)
CB/T3103.4—92
Continued Table 5
Basis for selecting tolerance
|Used as a set with N-type load-bearing casing, also applicable to cover nuts)@
6.2 Verticality
Difference, mm
Product grade
t=0. 017 5X
Measured circumference
= 0. 017 5
Measured
Measured
6.3 Pedal
Military secret front device
[Figure 2u
GB/T 3103. 4—92
Continued Table 5
Basis for selecting tolerance
t||Note: The measured circumference is 0.8 times the relevant dimension, such as 0.8d, 0.84, 0.8S. 8
difference, mtn
product grade
dsM39:
=0.009×measured circumference
d>M39:
t0.0045×
measured circumference
+0.009×measured circumference
d>M39:
r= 0. 004 5X
measured circumference
d≤M39:
dsM39:
=0. 017 5
×measured IX Measured
Applicable to all circumferences
measuredjd>M39:
d>M39:
xmeasured
×measured
Applicable to all measuring bases
d>M39:
×measured
GB/T 3103.4—92
Appendix A
Tolerance grades and tolerance zones
(supplement)
For ease of use, the tolerance grades and tolerance zones referenced in this standard are listed in Table A1. A
0. 04 3. 06
Tolerance level
0.048o.075.12
0.0580.09
~~30
0.0840.13
o.1850.29
~400
Additional notes:
±0.125±0.20±0.30
±0.24±0.375
± 0. 135± 0. 215±0. 35
±0.165±0.26
±0.195±0.31
+0.23±0.37
±0.600.95
±0.27±0.435±0.70|| tt||±0.315-0.50
±0.360.575±0.925±1.45
±0.405=0.65
+0.445+0.7
+0.485±0.775±1.25| |tt||This standard was proposed by the Ministry of Machinery and Electronics Industry of the People's Republic of China and is under the jurisdiction of the National Technical Committee on Fastener Standardization. This standard was drafted by the Machinery Standardization Research Institute of the Ministry of Machinery and Electronics Industry. mm
+0,14+0.25
+0.18+0.30
+0.22+0.36
+0.27 +0.43
+0.33+0.52
+0. 351 0. 62
0. 4610.74
+0.63—1.00
+0. 72+ 1. 13
+0. 81+ 1. 30
+0.97+1.55
This standard refers to DIN 267 Part 13-1980 for low temperature or heat resistant fasteners. Technical conditions, DIN 2510 Part 2 - 1971 "Nominal sizes and limit sizes of metric threads with large clearances for waisted shank screw connections".
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