JB/T 58651.7-1999 Fastener product quality classification Internal groove cylindrical head screws

JB/T 58651.7-1999 Fasteners Product Quality Classification Internal Recessed Cheese Head Screws JB/T58651.7-1999 Standard Download Decompression Password: www.bzxz.net

Mechanical Industry Standards of the People's Republic of China
JE/T 58651.1~58651.14-1999
JB/T58652-1999
Quality Classification of Fastener Products
(For Internal Use)
Published on 1999-12-30
National Bureau of Taoyuan Machinery Industry
Implemented on 2000-06-01
Mechanical Industry Standards of the People's Republic of China
Quality Classification of Fastener Products
Cylindrical Head Screws with Internal Recess
(For Use in the Western Region)
JB/T 58651.7—1999
JB/T 586.7-93
This standard specifies the principles and procedures for the quality classification of hexagon socket head screws and hexagon socket head screws (hereinafter referred to as screws) produced according to national standards and industry standards. The quality classification of products produced according to other standards can refer to the use of secondary classification, namely, superior products, qualified products. The standard is applicable to batches of single-specification products accepted by GB/T90. The size codes used in this standard are consistent with the current screw standards. Reference standards
The provisions contained in the following standards constitute the provisions of the standard by reference in this standard. When this standard is released, the provisions indicated are valid. All standards are subject to revision, and parties using technical standards should explore the possibility of using the following standards for the most recent version. GB/T 90—1985
GB/T1214.2—1996
GB/T1216—1985
GB/I1219198 5
GHT3098.11982
[Confirmed in 1988]
OBT30986—19B6
GB.T 3934-..1983
GB/T 5779.1—19RA
GB/T 5779.3-..1986
GB/T 6188--1986
1B.T8788198
JB.T$8651.1—1999
3 Terms, technical errors and calculation formulas
Acceptance inspection, marking and packaging of solidification parts
Vernier calipers, reverse calipers
Outside micrometers
Dial indicators
Mechanical properties of fastening
Bolts, screws and studs
Mechanical properties of fasteners
Today's rust Specification for the gingival pattern of steel bolts, screws, studs and screw ears
Surface defects of fasteners
Inspection of screws, screws and studs
General requirements
Surface defects of tightness
Special requirements for bolts, screws and screw ears
Hexagonal T-shaped fasteners for tightness
General rules for grading fastener products
The definition of defect grades such as weights and unit defect points and the calculation formula for unit defect points shall be in accordance with the provisions of T58651.1. 4 Inspection items, sampling rate, defect level and weighted value Inspection items, sampling rate, defect level and weighted value of products are as specified in Table 1: National Machinery Industry Bureau 1999-12-3 approved 2000-06-01 sales implementation 5 Grading standards JB/T58651.7-1999 Grading standards for inductive products are as specified in Table 2 6 Inspection methods Inspection methods for inductive products are as specified in Table 1: Table 1: Inspection items! 1
Chemical length + R
Explosion of this reverse rule (standard printing middle diameter and minor diameter of the screw thread) frequency pattern stop mark (grass middle diameter of the screw thread)
Dyeing degree of the running part
Mixed products
Thread large condensation d
Point screw material can d
Head point diameter
Head high
Nominal length support!
The length of the pattern
or the length of the large screw rod,
the axiality of the head protection axis
has the same benefits
mia sink
a kind of table gradually fast sink
hole performance
non-destructive performance control inspection
planning performance control inspection
item GB/3098.1B or GB/T3098.6 source standard s
the best
Taiwan Xi product
·quality product
superior product
to the feeling of heat width change 5
Burst pattern gauge [the more
effect of the middle diameter and the small light:
grade stop gauge effect
the radius of the lower circle of the single middle joint
head
the depth of the sense of the line
state effect people light.
Wax filling effect: d
Head diameter 4
Andu height
Public building secondary limit
(2) Special inspection tool
(caliper
(21 Special inspection tool
(1 caliper
(2) Special inspection tool
Through end media pattern ring
Adjustment ladder pattern ring gaugewww.bzxz.net
JB/T 58651.7—1999
Unit age hospital public standard
fs a.26 +
0.105.F:0 263
§Standard, specification
GET1214,2
GB/T12142
GR/T1211.2
GBT 3934
【1! Special radius sample bottle
()General
Hexagonal flower shape—[limited measurement
（2）Special inspection tool
（）Special control tool
GBT61B8
GB/T1214.2
GBT1216
GO:T1216
GBT1214. 2
GB12142
Pick up the small test method
In the same selection method, Weimeng
In 2 places, ten; angle direction dosage
Use your hand to rotate the bad man, monitor the ability to read the rules and let the bad man go, but you must not mess up the two burning (playing method, ring point calculation, etc.)
Six sure flower color shift GB, the rules of 618: six holes buy corners quickly to see||tt ||Return to the new measurement
main combustion efficiency grid axis direction, any mutual measurement of the two diameters is still full record: two 5, at the end of the system grow into 2 and: when 5 inches, in the instantaneous pattern of the two auxiliary measurement, but should not be the period of this collection of incomplete instantaneous part of the measurement of the Ni
support emergency! Times the lightest measurement
from the end of the pole to measure the length of the measurement
determine the key points of the butterfly effect
||Eliminating distance or
Tip hood length and
No-smoke length
Head to screw beating
Original line standard
Second type surface defect
Loss of surface defect
Machine carbon property
JB/T58651.7-1999
Table 3 (complete)
[Standard, specification
GE/T 1214.2
GRIT1214.2
Table and use
Special inspection or
Standard room size
GB door 1219
GB12142
JB/T8788
Inspection method
Starting from the end of the screw, the distance to the near end of the screw effect gauge surface (the length of the inner corner of the virtual ring gauge is removed: the support is measured from the end of the screw ring to the distance 1 that has not been removed The length of the screw to the pin is:
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