J 機(jī)械 機(jī)械綜合
1 GB/T 324-1988 焊縫符號(hào)表示法 Welds-symbolic representation on drawings
2 GB/T 944.1-1985 螺釘用十字槽 Cross recesses for screws
3 GB/T 1031-1995 表面粗糙度 參數(shù)及其數(shù)值 Surface rougnness--Parameters and their values
4 GB/T 1167-1996 過(guò)渡配合螺紋 The threads for transition fit
5 GB/T 1182-1996 形狀和位置公差 通則、定義、符號(hào)和圖樣表示法 Geometrical tolerancing--Generalities,definitions,symbols,indications on drawings
6 GB/T 1184-1996 形狀和位置公差 未注公差值 Geometrical tolerancing--Geometrical tolerance for features without individual tolerance indications
7 GB/T 1414-1978 管路旋入端用普通螺紋尺寸系列 General purpose screw threads for joints on pipe line--Dimensions
8 GB/T 1415-1992 米制錐螺紋 Metric tape screw thread
9 GB/T 1569-1990 圓柱形軸伸 Cylindrical shaft ends
10 GB/T 1570-1990 圓錐形軸伸 Conical shaft ends
11 GB/T 1801-1979 公差與配合 尺寸至 500mm孔、軸公差帶與配合 Tolerance and fitting, dimensions up to 500mm holes, shaft tolerance range and fitting
12 GB/T 1802-1979 公差與配合 尺寸大于 500至3150mm常用孔、軸公差帶 Tolerance and fitting, dimensions larger than 500mm andup to 3150mm ordinary holes,shaft tolerance range
13 GB/T 1803-1979 公差與配合 尺寸至18mm孔、軸公差帶 Tolerance and fitting, dimensions up to 18mm holes, shaft tolerance range
14 GB/T 1804-1992 一般公差 線性尺寸的未注公差 General tolerances—Tolerances for linear dimensions without individual tolerance indications
15 GB/T 1958-1980 形狀和位置公差 檢測(cè)規(guī)定 Rules for inspection of form and position tolerances
16 GB/T 2298-1991 機(jī)械振動(dòng)與沖擊 術(shù)語(yǔ) Mechanical vibration and shock—Terminology
17 GB/T 2358-1994 金屬材料裂紋尖端張開位移試驗(yàn)方法 Test method for crack-tip opening displacement measurement of metallic materials
18 GB/T 2516-1981 普通螺紋偏差表 (直徑1~355mm) Common screw thread deviation table
19 GB/T 3323-1987 鋼熔化焊對(duì)接接頭射線照相和質(zhì)量分級(jí) Methods for radiographic inspection and classification of radiographs for fusion welded butt joints in steel
20 GB/T 3505-1983 表面粗糙度 術(shù)語(yǔ) 表面及其參數(shù) Surface roughness--Terminology--Surface and its parameters
21 GB/T 4096-1983 棱體的角度與斜度系列 Series of angles and slopes on wedges and prisms
22 GB/T 4133-1984 莫氏圓錐的強(qiáng)制傳動(dòng)型式及尺寸 The type and dimensions for positive drive of Morse tapers
23 GB/T 4249-1996 公差原則 Tolerancing principle
24 GB/T 4380-1984 確定圓度誤差的方法 兩點(diǎn)、三點(diǎn)法 Assessment of departure from roundness--Two-and three-point methods
25 GB/T 4457.4-1984 機(jī)械制圖 圖線 Mechanical drawings--Lines
26 GB/T 4457.5-1984 機(jī)械制圖 剖面符號(hào) Mechanical drawings--Symbols for sections
27 GB/T 4458.2-1984 機(jī)械制圖 裝配圖中零、部件的序號(hào)及其編排方法 Mechanical drawings--Item references and its arrangement for assembling drawings
28 GB/T 4458.3-1984 機(jī)械制圖 軸測(cè)圖 Mechanical drawings--Axonometric drawings
29 GB/T 4458.4-1984 機(jī)械制圖 尺寸注法 Mechanical drawings--Dimensioning
30 GB/T 4458.5-1984 機(jī)械制圖 尺寸公差與配合注法 Mechanical drawings--Indication of tolerances for sizeand of fits
31 GB/T 4459.1-1995 機(jī)械制圖 螺紋及螺紋緊固件表示法 Mechanical drawings--Representation of screw threads and threaded parts
32 GB/T 4459.2-1984 機(jī)械制圖 齒輪畫法 Mechanical drawings--Conventional representation of gears
33 GB/T 4459.3-1984 機(jī)械制圖 花鍵畫法 Mechanical drawings--Conventional representation of splines
34 GB/T 4459.4-1984 機(jī)械制圖 彈簧畫法 Mechanical drawings--Conventional representation of springs
35 GB/T 4459.5-1984 機(jī)械制圖 中心孔表示法 Mechanical drawings--Simplified representation of centre holes
36 GB/T 4459.6-1996 機(jī)械制圖 動(dòng)密封圈表示法 Mechanical drawings--Representation of seals for dynamic application
37 GB/T 4460-1984 機(jī)械制圖 機(jī)構(gòu)運(yùn)動(dòng)簡(jiǎn)圖符號(hào) Mechanical drawings--Graphical symbols for kinematic diagrams
38 GB/T 4974-1989 壓縮機(jī)、鑿巖機(jī)械與氣動(dòng)工具優(yōu)先壓力 Compressors, rock drilling machines and pneumatic tools—Preferred pressures
39 GB/T 5371-1985 公差與配合 過(guò)盈配合的計(jì)算和選用 Tolerances and fits--The calculation and selection of interference fits
40 GB/T 5796.1-1986 梯形螺紋 牙型 Metric trapezoidal screw threads—Profile
41 GB/T 5796.2-1986 梯形螺紋 直徑與螺矩系列 Metric trapezoidal screw threads--System of diameter and pitch
42 GB/T 5796.3-1986 梯形螺紋 基本尺寸 Metric trapezoidal screw threads--Basic dimensions
43 GB/T 5796.4-1986 梯形螺紋 公差 Metric trapezoidal screw threads--Tolerances
44 GB/T 5847-1986 尺寸鏈 計(jì)算方法 Dimensional chain--Methods of calculation
45 GB/T 5898-1986 鑿巖機(jī)械與氣動(dòng)工具噪聲測(cè)量方法--工程法 Measurement of noise emitted by rock drilling machines and pneumatic tools--Engineering method
46 GB/T 6403.1-1986 球面半徑 Radii of sphere surfaces
47 GB/T 6403.2-1986 潤(rùn)滑槽 Lubricating grooves
48 GB/T 6403.3-1986 滾花 Knurl
49 GB/T 6403.4-1986 零件倒圓與倒角 Rounding and chamferd of parts
50 GB/T 6403.5-1986 砂輪越程槽 Relief grooves for grinding wheels
51 GB/T 6404-1986 齒輪裝置噪聲聲功率級(jí)測(cè)定方法 Determination of sound power level for noise emitted by gear units
52 GB/T 6414-1986 鑄件尺寸公差 Dimensional tolerances for castings
53 GB/T 6419-1986 潛水焊工考試規(guī)則 Regulations for the qualification test of diver-welders
54 GB/T 6444-1995 機(jī)械振動(dòng) 平衡術(shù)語(yǔ) Mechanical vibration--Balancing vocabulary
55 GB/T 6557-1986 撓性轉(zhuǎn)子的機(jī)械平衡 The mechanical balancing of flexible rotors
56 GB/T 6558-1986 撓性轉(zhuǎn)子平衡的評(píng)定準(zhǔn)則 Criteria for evaluating flexible rotor balance
57 GB/T 6567.1-1986 管路系統(tǒng)的圖形符號(hào) 基本原則 Graphical symbols for piping systems--Basic principles
58 GB/T 6567.2-1986 管路系統(tǒng)的圖形符號(hào) 管路 Graphical symbols for piping systems--Piping
59 GB/T 6567.3-1986 管路系統(tǒng)的圖形符號(hào) 管件 Graphical symbols for piping systems--Piping accessories
60 GB/T 6567.4-1986 管路系統(tǒng)的圖形符號(hào) 閥門和控制元件 Graphical symbols for piping systems--Valves and control regulation actuators
61 GB/T 6567.5-1986 管路系統(tǒng)的圖形符號(hào) 管路、管件和閥門等圖形符號(hào)的軸測(cè)圖畫法 Graphical symbols for piping systems--Axonometric representation of graphical symbols for piping, piping accessories and valves etc
62 GB/T 6719-1986 袋式除塵器分類及規(guī)格性能表示方法 Classification and specification for bag filters
63 GB/T 7220-1987 表面粗糙度 術(shù)語(yǔ) 參數(shù)測(cè)量 Surface roughness--Terminology--Measurement of surface roughness parameters
64 GB/T 7221-1987 現(xiàn)場(chǎng)平衡設(shè)備的說(shuō)明和評(píng)價(jià) Field balancing equipment--Description and evaluation
65 GB/T 7234-1987 圓度測(cè)量 術(shù)語(yǔ)、定義及參數(shù) Measurement of roundness--Terms, definitions and parameters of roundness
66 GB/T 7235-1987 評(píng)定圓度誤差的方法 半徑變化量測(cè)量 Methods for the assessment of departure from roundness--Measurement of variations in radius
67 GB/T 7306-1987 用螺紋密封的管螺紋 Pipe threads where pressure-tight joints are mede on the threads
68 GB/T 7307-1987 非螺紋密封的管螺紋 Pipe threads where pressure-tight jojints are not made on the threads
69 GB/T 7704-1987 Ｘ射線應(yīng)力測(cè)定方法 Residual stress measurement by X-ray
70 GB/T 7920.2-1987 建筑卷?yè)P(yáng)機(jī)術(shù)語(yǔ) Construction winches-Terminology
71 GB/T 7920.4-1987 混凝土機(jī)械術(shù)語(yǔ) Concrete machinery--Terminology
72 GB/T 7920.5-1987 壓路機(jī)和夯實(shí)機(jī)術(shù)語(yǔ) Rollers and compactors--Terminology
73 GB/T 7920.6-1987 樁工機(jī)械術(shù)語(yǔ) Pile driving machinery--Terminology
74 GB/T 7920.7-1987 翻斗車術(shù)語(yǔ) Small dumpers--Terminology
75 GB/T 7920.8-1987 鏟運(yùn)機(jī)術(shù)語(yǔ) Serapers--Terminology
76 GB/T 7920.9-1987 平地機(jī)術(shù)語(yǔ) Grader--Terminology
77 GB/T 7920.10-1987 混凝土攪拌機(jī)械術(shù)語(yǔ) Soil stabilizer--Terminology
78 GB/T 7920.11-1987 瀝青混凝土攪拌設(shè)備術(shù)語(yǔ) Asphalt mixing plant--Terminology
79 GB/T 7920.12-1987 瀝青混凝土攤鋪機(jī)術(shù)語(yǔ) Asphalt paver--Terminology
80 GB/T 7920.13-1987 混凝土路面鋪筑機(jī)械與設(shè)備術(shù)語(yǔ) Concrete pavement machine and equipment--Terminology
81 GB/T 7920.14-1987 瀝青噴灑機(jī)術(shù)語(yǔ) Asphalt distributor--Terminology
82 GB/T 7920.15-1987 瀝青貯存、熔化和加熱裝置術(shù)語(yǔ) Asphalt storage, melting and heating units--Terminology
83 GB/T 7920.16-1987 石料攤鋪機(jī)械術(shù)語(yǔ) Aggregate and chip spreader--Terminology
84 GB/T 7920.17-1987 鋼筋加工機(jī)械術(shù)語(yǔ) Steel reinforcement (bar) processing machinery--Terminology
85 GB/T 7920.18-1987 裝修機(jī)械術(shù)語(yǔ) Finishing machinery--Terminology
86 GB/T 8540-1987 振動(dòng)與沖擊隔離器確定特性要求導(dǎo)則 Vibration and shock--Isolators--Procedure for specifying characteristics
87 GB/T 8543-1987 驗(yàn)收試驗(yàn)中齒輪裝置 機(jī)械振動(dòng)的測(cè)定 Determination of mechanical vibrations of gear units during acceptance testing
88 GB/T 9145-1988 商品緊固件的中等精度 普通螺紋極限尺寸 General purpose screw threads—Limits of sizes for commercial bolt and nut threads—Medium quality
89 GB/T 9146-1988 商品緊固件的粗糙級(jí)精度 普通螺紋極限尺寸 General purpose screw threads—Limits of sizes for commercial bolt and nut threads—Coarse quality
90 GB/T 9443-1988 鑄鋼件滲透探傷及缺陷顯示跡痕的評(píng)級(jí)方法 Methods of liquid penetrant testing and classification of indication for steel castings
1 GB/T 324-1988 焊縫符號(hào)表示法 Welds-symbolic representation on drawings
2 GB/T 944.1-1985 螺釘用十字槽 Cross recesses for screws
3 GB/T 1031-1995 表面粗糙度 參數(shù)及其數(shù)值 Surface rougnness--Parameters and their values
4 GB/T 1167-1996 過(guò)渡配合螺紋 The threads for transition fit
5 GB/T 1182-1996 形狀和位置公差 通則、定義、符號(hào)和圖樣表示法 Geometrical tolerancing--Generalities,definitions,symbols,indications on drawings
6 GB/T 1184-1996 形狀和位置公差 未注公差值 Geometrical tolerancing--Geometrical tolerance for features without individual tolerance indications
7 GB/T 1414-1978 管路旋入端用普通螺紋尺寸系列 General purpose screw threads for joints on pipe line--Dimensions
8 GB/T 1415-1992 米制錐螺紋 Metric tape screw thread
9 GB/T 1569-1990 圓柱形軸伸 Cylindrical shaft ends
10 GB/T 1570-1990 圓錐形軸伸 Conical shaft ends
11 GB/T 1801-1979 公差與配合 尺寸至 500mm孔、軸公差帶與配合 Tolerance and fitting, dimensions up to 500mm holes, shaft tolerance range and fitting
12 GB/T 1802-1979 公差與配合 尺寸大于 500至3150mm常用孔、軸公差帶 Tolerance and fitting, dimensions larger than 500mm andup to 3150mm ordinary holes,shaft tolerance range
13 GB/T 1803-1979 公差與配合 尺寸至18mm孔、軸公差帶 Tolerance and fitting, dimensions up to 18mm holes, shaft tolerance range
14 GB/T 1804-1992 一般公差 線性尺寸的未注公差 General tolerances—Tolerances for linear dimensions without individual tolerance indications
15 GB/T 1958-1980 形狀和位置公差 檢測(cè)規(guī)定 Rules for inspection of form and position tolerances
16 GB/T 2298-1991 機(jī)械振動(dòng)與沖擊 術(shù)語(yǔ) Mechanical vibration and shock—Terminology
17 GB/T 2358-1994 金屬材料裂紋尖端張開位移試驗(yàn)方法 Test method for crack-tip opening displacement measurement of metallic materials
18 GB/T 2516-1981 普通螺紋偏差表 (直徑1~355mm) Common screw thread deviation table
19 GB/T 3323-1987 鋼熔化焊對(duì)接接頭射線照相和質(zhì)量分級(jí) Methods for radiographic inspection and classification of radiographs for fusion welded butt joints in steel
20 GB/T 3505-1983 表面粗糙度 術(shù)語(yǔ) 表面及其參數(shù) Surface roughness--Terminology--Surface and its parameters
21 GB/T 4096-1983 棱體的角度與斜度系列 Series of angles and slopes on wedges and prisms
22 GB/T 4133-1984 莫氏圓錐的強(qiáng)制傳動(dòng)型式及尺寸 The type and dimensions for positive drive of Morse tapers
23 GB/T 4249-1996 公差原則 Tolerancing principle
24 GB/T 4380-1984 確定圓度誤差的方法 兩點(diǎn)、三點(diǎn)法 Assessment of departure from roundness--Two-and three-point methods
25 GB/T 4457.4-1984 機(jī)械制圖 圖線 Mechanical drawings--Lines
26 GB/T 4457.5-1984 機(jī)械制圖 剖面符號(hào) Mechanical drawings--Symbols for sections
27 GB/T 4458.2-1984 機(jī)械制圖 裝配圖中零、部件的序號(hào)及其編排方法 Mechanical drawings--Item references and its arrangement for assembling drawings
28 GB/T 4458.3-1984 機(jī)械制圖 軸測(cè)圖 Mechanical drawings--Axonometric drawings
29 GB/T 4458.4-1984 機(jī)械制圖 尺寸注法 Mechanical drawings--Dimensioning
30 GB/T 4458.5-1984 機(jī)械制圖 尺寸公差與配合注法 Mechanical drawings--Indication of tolerances for sizeand of fits
31 GB/T 4459.1-1995 機(jī)械制圖 螺紋及螺紋緊固件表示法 Mechanical drawings--Representation of screw threads and threaded parts
32 GB/T 4459.2-1984 機(jī)械制圖 齒輪畫法 Mechanical drawings--Conventional representation of gears
33 GB/T 4459.3-1984 機(jī)械制圖 花鍵畫法 Mechanical drawings--Conventional representation of splines
34 GB/T 4459.4-1984 機(jī)械制圖 彈簧畫法 Mechanical drawings--Conventional representation of springs
35 GB/T 4459.5-1984 機(jī)械制圖 中心孔表示法 Mechanical drawings--Simplified representation of centre holes
36 GB/T 4459.6-1996 機(jī)械制圖 動(dòng)密封圈表示法 Mechanical drawings--Representation of seals for dynamic application
37 GB/T 4460-1984 機(jī)械制圖 機(jī)構(gòu)運(yùn)動(dòng)簡(jiǎn)圖符號(hào) Mechanical drawings--Graphical symbols for kinematic diagrams
38 GB/T 4974-1989 壓縮機(jī)、鑿巖機(jī)械與氣動(dòng)工具優(yōu)先壓力 Compressors, rock drilling machines and pneumatic tools—Preferred pressures
39 GB/T 5371-1985 公差與配合 過(guò)盈配合的計(jì)算和選用 Tolerances and fits--The calculation and selection of interference fits
40 GB/T 5796.1-1986 梯形螺紋 牙型 Metric trapezoidal screw threads—Profile
41 GB/T 5796.2-1986 梯形螺紋 直徑與螺矩系列 Metric trapezoidal screw threads--System of diameter and pitch
42 GB/T 5796.3-1986 梯形螺紋 基本尺寸 Metric trapezoidal screw threads--Basic dimensions
43 GB/T 5796.4-1986 梯形螺紋 公差 Metric trapezoidal screw threads--Tolerances
44 GB/T 5847-1986 尺寸鏈 計(jì)算方法 Dimensional chain--Methods of calculation
45 GB/T 5898-1986 鑿巖機(jī)械與氣動(dòng)工具噪聲測(cè)量方法--工程法 Measurement of noise emitted by rock drilling machines and pneumatic tools--Engineering method
46 GB/T 6403.1-1986 球面半徑 Radii of sphere surfaces
47 GB/T 6403.2-1986 潤(rùn)滑槽 Lubricating grooves
48 GB/T 6403.3-1986 滾花 Knurl
49 GB/T 6403.4-1986 零件倒圓與倒角 Rounding and chamferd of parts
50 GB/T 6403.5-1986 砂輪越程槽 Relief grooves for grinding wheels
51 GB/T 6404-1986 齒輪裝置噪聲聲功率級(jí)測(cè)定方法 Determination of sound power level for noise emitted by gear units
52 GB/T 6414-1986 鑄件尺寸公差 Dimensional tolerances for castings
53 GB/T 6419-1986 潛水焊工考試規(guī)則 Regulations for the qualification test of diver-welders
54 GB/T 6444-1995 機(jī)械振動(dòng) 平衡術(shù)語(yǔ) Mechanical vibration--Balancing vocabulary
55 GB/T 6557-1986 撓性轉(zhuǎn)子的機(jī)械平衡 The mechanical balancing of flexible rotors
56 GB/T 6558-1986 撓性轉(zhuǎn)子平衡的評(píng)定準(zhǔn)則 Criteria for evaluating flexible rotor balance
57 GB/T 6567.1-1986 管路系統(tǒng)的圖形符號(hào) 基本原則 Graphical symbols for piping systems--Basic principles
58 GB/T 6567.2-1986 管路系統(tǒng)的圖形符號(hào) 管路 Graphical symbols for piping systems--Piping
59 GB/T 6567.3-1986 管路系統(tǒng)的圖形符號(hào) 管件 Graphical symbols for piping systems--Piping accessories
60 GB/T 6567.4-1986 管路系統(tǒng)的圖形符號(hào) 閥門和控制元件 Graphical symbols for piping systems--Valves and control regulation actuators
61 GB/T 6567.5-1986 管路系統(tǒng)的圖形符號(hào) 管路、管件和閥門等圖形符號(hào)的軸測(cè)圖畫法 Graphical symbols for piping systems--Axonometric representation of graphical symbols for piping, piping accessories and valves etc
62 GB/T 6719-1986 袋式除塵器分類及規(guī)格性能表示方法 Classification and specification for bag filters
63 GB/T 7220-1987 表面粗糙度 術(shù)語(yǔ) 參數(shù)測(cè)量 Surface roughness--Terminology--Measurement of surface roughness parameters
64 GB/T 7221-1987 現(xiàn)場(chǎng)平衡設(shè)備的說(shuō)明和評(píng)價(jià) Field balancing equipment--Description and evaluation
65 GB/T 7234-1987 圓度測(cè)量 術(shù)語(yǔ)、定義及參數(shù) Measurement of roundness--Terms, definitions and parameters of roundness
66 GB/T 7235-1987 評(píng)定圓度誤差的方法 半徑變化量測(cè)量 Methods for the assessment of departure from roundness--Measurement of variations in radius
67 GB/T 7306-1987 用螺紋密封的管螺紋 Pipe threads where pressure-tight joints are mede on the threads
68 GB/T 7307-1987 非螺紋密封的管螺紋 Pipe threads where pressure-tight jojints are not made on the threads
69 GB/T 7704-1987 Ｘ射線應(yīng)力測(cè)定方法 Residual stress measurement by X-ray
70 GB/T 7920.2-1987 建筑卷?yè)P(yáng)機(jī)術(shù)語(yǔ) Construction winches-Terminology
71 GB/T 7920.4-1987 混凝土機(jī)械術(shù)語(yǔ) Concrete machinery--Terminology
72 GB/T 7920.5-1987 壓路機(jī)和夯實(shí)機(jī)術(shù)語(yǔ) Rollers and compactors--Terminology
73 GB/T 7920.6-1987 樁工機(jī)械術(shù)語(yǔ) Pile driving machinery--Terminology
74 GB/T 7920.7-1987 翻斗車術(shù)語(yǔ) Small dumpers--Terminology
75 GB/T 7920.8-1987 鏟運(yùn)機(jī)術(shù)語(yǔ) Serapers--Terminology
76 GB/T 7920.9-1987 平地機(jī)術(shù)語(yǔ) Grader--Terminology
77 GB/T 7920.10-1987 混凝土攪拌機(jī)械術(shù)語(yǔ) Soil stabilizer--Terminology
78 GB/T 7920.11-1987 瀝青混凝土攪拌設(shè)備術(shù)語(yǔ) Asphalt mixing plant--Terminology
79 GB/T 7920.12-1987 瀝青混凝土攤鋪機(jī)術(shù)語(yǔ) Asphalt paver--Terminology
80 GB/T 7920.13-1987 混凝土路面鋪筑機(jī)械與設(shè)備術(shù)語(yǔ) Concrete pavement machine and equipment--Terminology
81 GB/T 7920.14-1987 瀝青噴灑機(jī)術(shù)語(yǔ) Asphalt distributor--Terminology
82 GB/T 7920.15-1987 瀝青貯存、熔化和加熱裝置術(shù)語(yǔ) Asphalt storage, melting and heating units--Terminology
83 GB/T 7920.16-1987 石料攤鋪機(jī)械術(shù)語(yǔ) Aggregate and chip spreader--Terminology
84 GB/T 7920.17-1987 鋼筋加工機(jī)械術(shù)語(yǔ) Steel reinforcement (bar) processing machinery--Terminology
85 GB/T 7920.18-1987 裝修機(jī)械術(shù)語(yǔ) Finishing machinery--Terminology
86 GB/T 8540-1987 振動(dòng)與沖擊隔離器確定特性要求導(dǎo)則 Vibration and shock--Isolators--Procedure for specifying characteristics
87 GB/T 8543-1987 驗(yàn)收試驗(yàn)中齒輪裝置 機(jī)械振動(dòng)的測(cè)定 Determination of mechanical vibrations of gear units during acceptance testing
88 GB/T 9145-1988 商品緊固件的中等精度 普通螺紋極限尺寸 General purpose screw threads—Limits of sizes for commercial bolt and nut threads—Medium quality
89 GB/T 9146-1988 商品緊固件的粗糙級(jí)精度 普通螺紋極限尺寸 General purpose screw threads—Limits of sizes for commercial bolt and nut threads—Coarse quality
90 GB/T 9443-1988 鑄鋼件滲透探傷及缺陷顯示跡痕的評(píng)級(jí)方法 Methods of liquid penetrant testing and classification of indication for steel castings