关于滤芯I-644C5TB和SO-640V在变加载液压站、主轴油泵中的应用，以下是它们被认为好用的原因：

材质和结构：I-644C5TB滤芯由单多层金属和丁晴橡胶（NBR）材料制作而成，这种材质具有耐油、耐老化性能，可在120℃的空气中或150℃的油中长期使用。此外，它还具有良好的耐水性、气密性及优良的粘结性能3。

过滤精度和通量：I-644C5TB滤芯的滤芯精度范围为0.5-100μm，其通量是同等精度峰房滤芯的1.5倍以上，可截留不同粒径的杂质，满足各种工程安装的需要3。

应用领域广泛：I-644C5TB滤芯适用于工程机械、液压机、船舶等应用领域，具有较高的通用性和适应性3。

承受压差和温度：I-644C5TB滤芯能承受6MPa的压差，吸油段 可承受200℃的温度，适合在高压和高温环境下工作3。

供货稳定：根据搜索结果，I-644C5TB滤芯的供货总量为10000个，发货地在河南新乡，发货期限为1天内发货，表明该滤芯的供应较为稳定2。

需要注意的是，关于SO-640V滤芯的信息在搜索结果中未详细提及，因此无法提供其具体优势。如果需要更详细的信息，建议直接联系供应商或查阅相关技术资料。

50-L-0700SKN-06NBC / RP1050F0706HCFTE066-1000SKS-4NBC / RP0066F1004H,过滤精度：10 um  D106/D72-L461 MM;
CF0085-L-0000FKR-08NBC / RP0885EXX08H,过滤精度：50 um 尺寸：D40/D22-L150 MM
CFWH05-1000FSDK-06NBC；过滤精度：10 um，物料编码：CBTPN00175 尺寸：D90.5/D48.2-L162 M
CFWH05-0700FSDN-06NBC；过滤精度：7 um，物料编码：CBTPN00171;材质:碳钢镀锌端盖骨架+玻璃纤维+丁晴橡胶密封 尺寸：D90.5/D48.2-L162 MMCF1050-L-0700SKN-06NBC / RP1050F0706HCF2400-L-0500SKP-16NBC / RP2400F0516H,
CFWZ03-0500SKP-16NBCCPL-40C / RPLE1H18HCF2400-L-0500SKP-16NBC / RP2400F0516HCFTE066-1000SKS-4NBC / RP0066F1004HCF2400-L-2000KT-25NBC / RP2400F2225H
CFTE066-1000SKS-4NBC / RP0066F1004CF0085-L-0000FKR-08NBC / RP0885EXX08HCFWH05-1000FSDK-06NBCCFWH05-0700FSDN06NBCPYX8300MN201YKPYX2296FC736150YT;PYX8904FV2262
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P-SRF03/10P5394702342492254672530K145AO020925R12FA1003075ZP3075XPAC393SS10/30MF10/30CC-220P-SRFV10/30
CAC-1122A112076749-179122394K53214623900852979TI8.25V4A85067179170837000ZS1063358P032358-016-340
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BHS-08-00433DUOTO90/838CC-22-7LCS4H1AH336-MIC01EBFLT486DUOTOV90/180FLT48610317884743155PCHG-36PCHG-324I-646C5TBCC-22-CCS604LGDH13CAA43-5CAA56-5MICROTOV90/1104MICROTOV90/838CR28C6028-5P1FG-324FG-336
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HP311-12-GE342A2581P002HP0392A25ANP01EA022047AG04NEA026055AC04N342A2581P008MCC1401E100H13
HC6500FDS26H01.NR.1000.25G.10.B.VSH6397431136501.NLHC9100FCN8ZHC8300FCZ16H76057060160DN025W/HC
R928036413UE319AP10Z0140D010BN3HCHC8314FKP16H