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Mainstream RF connectors in China include basic and their scaled-down versions, mostly for communications and medical equipment, instruments and military applications.
Besides SSMA, SSMB, MMCX and I-Pex RF connectors, China suppliers have male and female SMA, SMB, BNC, MCX, N, F, 7/16 DIN and TNC varieties with impedance of 50 or 70ohm. These target mainly communications, medical, instrument and military applications.
Typical connectors have brass or copper alloy body and contacts with gold or nickel plating, and PE, nylon 66 with glass fiber or UL94V-0-rated thermoplastic insulator.
Makers use local metal and plastic, sourcing from foreign providers only on request.
The cost of materials has been generally stable, and will keep prices steady until end-2016.
Here is selection of RF connectors from China.

Asian Creation Communication Fty's right-angle female RF connector for PCBs, SMA model, has 0 to 3GHz frequency range, 50ohm impedance and 1.5 maximum VSWR.
The unit has a brass body, phosphor bronze pin, Teflon insulator, iron washer, silicone O-ring, copper ferrule and solder contacts.
The minimum order is negotiable. Delivery is within 3 days.

This RF connector from Danyang Teruilai Electronics Co. Ltd's, BNC SMA-JK model, has 50ohm impedance, and ≤3mohm center and ≤2mohm outer contact, and ≥5,000Mohm insulation resistance. The dielectric withstand voltage is 1,000V rms.
The unit complies with MIL-C-39012, IEC 169-8 and CEC 22120. The life span is 500 cycles.
The minimum order is 100 units. Delivery lead time is 10 days.

The 36408442001 model from Junper (Ningbo) Tech Corp. is a BNC male-to-female straight RF connector. It has 0 to 3GHz frequency range, 50ohm impedance, and ≤1mohm center and ≤0.25mohm outer contact, and 5,000Mohm minimum insulation resistance. The dielectric withstand voltage is 2,500V/min. VSWR is ≤1.12.
The unit has a brass body and center contact with respective CuSnZn and nickel plating, and a PTFE insulator. It lasts 500 cycles.
The maker requires a minimum order of 1,000 units, and delivery is within 14 days.

This RF connector from YongZheng RF & Microwave Solution, MCX model, has 0 to 60Hz frequency range, 75ohm impedance, ≤5mohm inner and ≤2.5mohm outer contact, and ≥1,000Mohm insulation resistance. The withstand voltage is 250V.
The unit complies with CECC 22220 and IEC 61169-36. It withstands 500 insert/withdraw cycles.
The negotiable minimum order is delivered within 7 days.
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