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3BG等级螺纹规
9.735-16UNJS-3BG螺纹塞规
航空螺纹塞规3BG等级
什么等级的量规是3BG的量规?
进口3BG量规去哪里采购?
苏州航空螺纹专家,苏州斯文克精密测量设备有限公司
苏州Vermont Gage总代理


3BG Class-of-Fit (obsolete)

 

MIL-STD-8879C (obsolete) contained paragraph 6.3 which is titled: Class 3BG.

MIL-STD-8879C: 6.3 Class 3BG
According to MIL-S-8879C paragraph 6.3 Class 3BG states: Class 3BG for high temperature applications shall no longer be used in new designs. This special class-of-fit for internal threads provides an allowance to both the GO and NOGO work plug gage pitch diameters of +0.0030" for 32-TPI and coarser. For finer ptch threads (finer than 32-TPI) +0.0010".

The above paragraph was not carried over to ANSI/ASME SAE AS8879. Also, 3BG is not mentioned at all in ANSI/ASME SAE AS8879.

 

MIL-STD-8879C (obsolete)
UNJF Class 3BG only applies to internal threads
THREAD SIZE
MINOR DIAMETER
PITCH DIAMETER
MAJOR DIAMETER
MIN
MAX
MIN
MAX
MIN
#0-80 UNJF-3BG
0.0489
0.0521
0.0529
0.0546
0.0610
#1-72 UNJF-3BG
0.0605
0.0641
0.0650
0.0669
0.0740
#2-64 UNJF-3BG
0.0718
0.0759
0.0769
0.0789
0.0870
#3-56 UNJF-3BG
0.0826
0.0872
0.0884
0.0905
0.1000
#4-48 UNJF-3BG
0.0927
0.0981
0.0995
0.1018
0.1130
#5-44 UNJF-3BG
0.1039
0.1098
0.1112
0.1136
0.1260
#6-40 UNJF-3BG
0.1147
0.1212
0.1228
0.1253
0.1390
#8-36 UNJF-3BG
0.1380
0.1452
0.1470
0.1497
0.1650
#10-32 UNJF-3BG
0.1626
0.1705
0.1727
0.1756
0.1930
#12-28 UNJF-3BG
0.1842
0.1926
0.1958
0.1989
0.2190
1/4"-28 UNJF-3BG
0.2182
0.2259
0.2298
0.2330
0.2530
5/16"-24 UNJF-3BG
0.2749
0.2829
0.2884
0.2920
0.3155
3/8"-24 UNJF-3BG
0.3374
0.3447
0.3509
0.3546
0.3780
7/16"-20 UNJF-3BG
0.3918
0.4000
0.4080
0.4121
0.4405
1/2"-20 UNJF-3BG
0.4543
0.4621
0.4703
0.4747
0.5030
9/16"-18 UNJF-3BG
0.5114
0.5196
0.5294
0.5338
0.5655
5/8"-18 UNJF-3BG
0.5739
0.5818
0.5919
0.5964
0.6280
3/4"-16 UNJF-3BG
0.6922
0.7007
0.7124
0.7173
0.7530
7/8'-14 UNJF-3BG
0.8085
0.8182
0.8316
0.8369
0.8780
1"-12 UNJF-3BG
0.9219
0.9319
0.9489
0.9546
1.0030
1-1/8"-12 UNJF-3BG
1.0469
1.0569
1.0739
1.0798
1.1280
1-1/4"-12 UNJF-3BG
1.1719
1.1819
1.1989
1.2049
1.2530
1-3/8"-12 UNJF-3BG
1.2969
1.3089
1.3239
1.3300
1.3780
1-1/2"-12 UNJF-3BG
1.4219
1.4319
1.4489
1.4552
1.5030
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