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Kirt Blattenberger - RF Cafe Webmaster

Copyright: 1996 - 2024
Webmaster:
    Kirt Blattenberger,

    BSEE - KB3UON

RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling 2 MB. Its primary purpose was to provide me with ready access to commonly needed formulas and reference material while performing my work as an RF system and circuit design engineer. The World Wide Web (Internet) was largely an unknown entity at the time and bandwidth was a scarce commodity. Dial-up modems blazed along at 14.4 kbps while typing up your telephone line, and a nice lady's voice announced "You've Got Mail" when a new message arrived...

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RF Coaxial Connector Torque Specifications

Properly torqueing of threaded RF coaxial connectors is essential for reliable, maximum performance interfaces. It not only ensures that the initial contact is proper, it also protects against changes in geometry during handling and operational environment conditions.

Connector Coupling
Torque
N-cm/lb-in
Open-End
Wrench Size
Type DIN 7-16 3500/310 27 & 32 mm
Type F (75 ohm) 168/15 7/16
Type FD 168/15  
7 mm (APC-7) 135/12 3/4 in (19 mm)
Type N 50/75 ohm 135/12
135/12
25/32 in (20 mm)
3/4 in (19 mm)
3.5 mm 90/8 8 mm
2.4 mm 90/8 8 mm
2.92 mm (K) 90/8 8 mm
1.85 mm (V) 90/8 5/16 in (8 mm)
SMA, OSM 45/4 (economic)
100/9 (standard)
195/17 (hermetic)
5/16 in (8 mm)
5/16 in (8 mm)
 7 mm
SSMA 70/6 0.25
SMC 35/3 6 mm
TNC 56/5 9/16 (15 mm)
1.0 mm 45/4 6 mm

These values were originally pulled from Agilent's calibrated torque wrench page, but it has disappeared. Additional information gathered from other online sources such as the Huber+Suhner and Radiall websites. Torque values can vary considerably between vendors.  1 lb-in = 11.30 N-cm

Fairview Microwave sells calibrated torque wrenches.

Related Pages on RF Cafe
- RF Coaxial Connector Torque Specifications
- Coaxial Connector Descriptions & Drawings
- Coaxial Connector Usage Properties
- RF Coaxial Connector Torque Specifications
- Connector & Adapter Manufacturers
- EW Radar Handbook - Connectors

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