Premium Microwave Cables and Adapters

Flexible, Low-Loss, High-Frequency Microwave Cables
SMP, SMPM, SMA, 2.92 mm, and 2.4 mm Cables and Adapters
Options for Frequencies up to 50 GHz

SMM12

SMA Male Cable

GPPKM24

SMPM Female to 2.92 mm Male Cable

KMF

2.92 mm M-to-F Adapter

TMKM4

2.92 mm Male-to-2.4 mm Male Adapter Cable

SFGF6

SMA Female-to-SMP Female Adapter Cable

TMM

2.4 mm M-to-M Adapter

TFKM

2.4 mm Female to
2.92 mm Male Adapter

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Overview
Specs
Graphs
Compatibility
Feedback

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Offered Connector Types

Click for Details
A torque wrench with a preset torque value should always be used to mate these coaxial connectors. Not doing so can damage the cable or reduce its overall performance. Wrenches for use with SMA or 2.92 mm and 2.4 mm connectors are available below.

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Each cable is labeled with its item number for identification.

Janis Valdmanis, Ph.D. Optics
Ultrafast Optoelectronics
General Manager

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Features

Flexible Microwave Cables, Adapter Cables, and Adapters
Broad Frequency Ranges:

SMP: DC - 18 GHz
SMA: DC - 26 GHz
SMPM: DC - 40 GHz
2.92 mm: DC - 40 GHz
2.4 mm: DC - 50 GHz

Cables Available with SMA, 2.92 mm, 2.4 mm, or SMP (GPO^®*Compatible) Connectors
Adapter Cables for SMPM (SSMP or GPPO^®** Compatible) to 2.92 mm, SMA to SMP, or 2.4 mm to 2.92 mm
Adapters for 2.4 mm, 2.92 mm, or 2.4 mm to 2.92 mm
Low Insertion Loss and VSWR (See Specs Tab)
Preset Torque Wrenches Ensure Proper Mating Torque is Supplied

Thorlabs' Microwave Cables and Adapter Cables are flexible, high-performance, coaxial cable assemblies designed for use out to 50 GHz, depending on connector type (see the image to the right). The design gives these cables flexibility while maintaining optimal performance. They exhibit low VSWRs (Voltage Standing Wave Ratios) over the usable frequency range, as well as low insertion losses (see the Specs tab). These cables are each tested to ensure performance.

The frequency range and connector types supported by these cables and adapter cables are well suited for use with our High-Speed, Fiber-Coupled Electro-Optic (EO) Modulators.

Microwave Cables
We offer four styles of microwave cables: SMP, SMA, 2.92 mm, and 2.4 mm. The SMP style cables are female-to-female cables and are offered in 3" and 6" lengths. The SMA, 2.92 mm, and 2.4 mm styles are male-to-male cables and are offered in several different lengths.

Microwave Adapter Cables
Thorlabs’ adapter cables are designed to mate different connector types. We offer phase-matched pairs of SMPM-to-2.92 mm adapter cables with SMPM female connectors on one end and 2.92 mm male connectors on the other. We also offer SMA-to-SMP adapter cables with SMA female or male connectors on one end and SMP female connectors on the other. Additionally, we offer 2.4 mm-to-2.92 mm adapter cables for all combinations of male/female connectors.

Microwave Adapters
These microwave cable adapters are designed to change the gender or connector type of microwave cables and connectors. They include in-series adapters for 2.92 mm and 2.4 mm, as well as between-series adapters for all gender combinations of 2.92 mm and 2.4 mm cables.

SMA connectors can mate directly with 2.92 mm connectors, thus no adapter is required. It should be noted, however, that whenever mating two connector types, the connector with the lowest bandwidth will determine the usable frequency range. For more information, see the Compatibility tab.

Preset Torque Wrenches
Preset torque wrenches provide a preset torque value to ensure that the proper amount of torque is supplied when mating two microwave cables or adapters. The TQW5A is set to provide 5 in-lbs of torque, which is ideal for most SMA connectors, while the TQW8A is set to provide 8 in-lbs of torque, which is ideal for 2.92 mm and 2.4 mm connectors. A torque wrench should always be used to mate these coaxial connectors. Not doing so can damage the cable or reduce its overall performance.

*GPO is a registered trademark of Corning-Gilbert Inc.
**GPPO is a registered trademark of Corning-Gilbert Inc.

Quick Links
Cables	SMP to SMP	Click for Compatibility Chart
	SMA to SMA
	2.4 mm to 2.4 mm
	2.92 mm to 2.92 mm
Adapter Cables	SMA to SMP
	SMPM to 2.92 mm
	2.4 mm to 2.92 mm
Adapters	2.4 mm and 2.92 mm
Preset Torque Wrenches

Microwave Cables

Item #	Maximum Insertion Loss	Length
SMA Male to SMA Male
SMM3	0.9 dB	76 mm (3.00")
SMM6	1.3 dB	152 mm (6.00")
SMM12	2.0 dB	305 mm (12.00")
SMM24	3.5 dB	610 mm (24.00")
SMM36	4.9 dB	914 mm (36.00")
SMM72	9.5 dB	1829 mm (72.00")
SMM120	15.3 dB	3048 mm (120.00")
2.92 mm Male to 2.92 mm Male
KMM4	0.9 dB	102 mm (4.00")
KMM8	1.1 dB	203 mm (8.00")
KMM12	1.6 dB	305 mm (12.00")
KMM24	2.6 dB	610 mm (24.00")
KMM36	3.6 dB	914 mm (36.00")
KMM72	6.5 dB	1829 mm (72.00")
2.4 mm Male to 2.4 mm Male
TMM4	1.1 dB	102 mm (4.00")
TMM8	1.4 dB	203 mm (8.00")
TMM12	1.8 dB	305 mm (12.00")
TMM24	3.1 dB	610 mm (24.00")
TMM36	4.1 dB	914 mm (36.00")
SMP Female to SMP Female
GFF3	1.2 dB	76 mm (3.00")
GFF6	1.5 dB	152 mm (6.00")

Common Specifications
Connector Type	SMA Male to SMA Male	2.92 mm Male to 2.92 mm Male	2.4 mm Male to 2.4 mm Male	SMP Female to SMP Female
Frequency Range	DC - 26 GHz	DC - 40 GHz	DC - 50 GHz	DC - 18 GHz
Outer Cable Diameter	2.6 mm	3.6 mm	3.6 mm	2.64 mm
Center Conductor (Solid)	Ø0.5 mm	Ø0.72 mm	Ø0.72 mm	Ø0.51 mm
Impedance	50 Ω
Withstand Voltage	500 VDC	1000 VDC	1000 VDC	1500 VDC
Minimum Bend Radius	14 mm	36 mm	36 mm	6.4 mm
Capacitance	96 pF/m	87 pF/m	87 pF/m	96 pF/m
Maximum Average Power	28 W @ 10 GHz	127 W @ 10 GHz	127 W @ 10 GHz	31 W @ 10 GHz
Maximum VSWR^a	1.3 @ 18 GHz 1.7 @ 26 GHz	1.45 @ 40 GHz	1.45 @ 40 GHz	1.4 @ 18 GHz
Propagation Velocity	69.5%	74%	74%	69.5%
Coupling Nut Hex Size	5/16"
Recommended Coupling Torque	5 in•lb (0.56 N•m)	8 in•lb (0.9 N•m)	8 in•lb (0.9 N•m)	5 in•lb (0.56 N•m)

Voltage Standing Wave Ratio

Microwave Adapter Cables

Common Specifications
Male Connector Type	2.92 mm	SMA	N/A	2.4 mm to 2.92 mm	2.4 mm	2.92 mm	N/A
Female Connector Type	SMPM	SMP	SMA to SMP	N/A	2.92 mm	2.4 mm	2.4 mm to 2.92 mm
Item #s	GPPKM4 GPPKM12 GPPKM24	SMFG3 and SMGF6	SFGF3 and SFGF6	TMKM4	TMKF4	TFKM4	TFKF4
Frequency Range	DC - 40 GHz	DC - 18 GHz		DC - 40 GHz
Delay Match Within Pair	±1 ps	N/A
Outer Cable Diameter	Ø2.2 mm	2.64 mm		3.60 mm
Center Conductor (Solid)	Ø0.49 mm	Ø0.51 mm		Ø0.72 mm
Impedance	50 Ω
Withstand Voltage	500 VDC	1500 VDC		1000 VDC
Minimum Bend Radius	10 mm	6.4 mm		36 mm
Capacitance	83 pF/m	96 pF/m		87 pF/m
Max Average Power	12 W @ 40 GHz	31 W @ 10 GHz		127 W @ 10 GHz
Maximum VSWR^a	1.4 @ 20 GHz 1.7 @ 40 GHz	1.4 @ 18 GHz		1.45 @ 40 GHz
Propagation Velocity	74%	69.5%		74%
Coupling Nut Hex Size	5/16"
Recommended Coupling Torque	8 in•lb (0.90 N•m)	5 in•lb (0.56 N•m)		8 in•lb (0.9 N•m)

Voltage Standing Wave Ratio

Item #	Maximum Insertion Loss	Length
SMPM Female to 2.92 mm
GPPKM4	1.25 dB	101.6 ± 8 mm (4.00" ± 0.30")
GPPKM12	2.16 dB	304.8 ± 8 mm (12.00" ± 0.30")
GPPKM24	3.53 dB	609.6 ± 8 mm (24.00" ± 0.30")
SMA Male to SMP Female
SMGF3	1.0 dB	76 mm (3.00")
SMGF6	1.2 dB	152 mm (6.00")
SMA Female to SMP Female
SFGF3	1.0 dB	76 mm (3.00")
SFGF6	1.2 dB	152 mm (6.00")
2.4 mm Male to 2.92 mm Male
TMKM4	1.0 dB	102 mm (4.00")
2.4 mm Male to 2.92 mm Female
TMKF4	1.0 dB	102 mm (4.00")
2.4 mm Female to 2.92 mm Male
TFKM4	1.0 dB	102 mm (4.00")
2.4 mm Female to 2.92 mm Female
TFKF4	1.0 dB	102 mm (4.00")

Microwave Cable Adapters

Specifications
Item #	Connector Type	VSWR	Length	Frequency Range
KFF	2.92 mm F-F	1.2	19.00 mm	DC - 40 GHz
KMF	2.92 mm M-F		20.10 mm
KMM	2.92 mm M-M		21.20 mm
TFF	2.4 mm F-F		19.10 mm	DC - 50 GHz
TMF	2.4 mm M-F		18.15 mm
TMM	2.4 mm M-M		17.20 mm
TFKF	2.4 mm F - 2.92 mm F		20.40 mm	DC - 40 GHz
TFKM	2.4 mm F - 2.92 mm M		21.50 mm
TMKF	2.4 mm M - 2.92 mm F	1.25	19.45 mm
TMKM	2.4 mm M - 2.92 mm M	1.25	20.55 mm

Common Specifications
Impedance	50 Ω
Durability	500 Connection Cycles
Material	Stainless Steel (303)
Conductor	Gold-Plated Brass (M) or Gold-Plated BeCu (F)
Coupling Torque	8 in-lbs (0.9 N-m)
Coupling Nut Hex Size	5/16"

Click to Enlarge
The graph above shows the insertion loss for SMP-to-SMP Microwave Cables. The shaded region denotes the specified operating frequency range of these cables. Ripples in the insertion loss are a function of the cable length and a normal result of reflections between the ends of the cables. Shorter cables show a greater effect.

Click to Enlarge
The graph above shows the insertion loss for SMA-to-SMA Microwave Cables. The shaded region denotes the specified operating frequency range of these cables. Ripples in the insertion loss are a function of the cable length and a normal result of reflections between the ends of the cables. Shorter cables show a greater effect.

Click to Enlarge
The graph above shows the insertion loss for 2.4 mm-to-2.4 mm Microwave Cables. The shaded region denotes the specified operating frequency range of these cables. Ripples in the insertion loss are a function of the cable length and a normal result of reflections between the ends of the cables. Shorter cables show a greater effect.

Click to Enlarge
The graph above shows the insertion loss for 2.92 mm-to-2.92 mm Microwave Cables. The shaded region denotes the specified operating frequency range of these cables. Ripples in the insertion loss are a function of the cable length and a normal result of reflections between the ends of the cables. Shorter cables show a greater effect.

Click to Enlarge
Click Here for Data
The graph above shows the insertion loss for SMPM-to-2.92 mm Microwave Cables. The shaded region denotes the specified operating frequency range of these cables. Ripples in the insertion loss are a function of the cable length and a normal result of reflections between the ends of the cables. Shorter cables show a greater effect.

Connector Type	Other Connector Types that can be Mated Directly
SMP	GPO^®
SMPM	SSMP, GPPO^®
SMA	2.92 mm, 3.5 mm, or K
2.92 mm	SMA, 3.5 mm, or K
2.4 mm	1.85 mm or V

The plot below summarizes the microwave compatibility for the SMP, SMPM, SMA, 2.92 mm, and 2.4 mm connectors used by the cables available on this page. The table to the right summarizes which connector types can be directly mated without the use of an adapter. Performance will be limited by the connector type with the smallest maximum frequency, as indicated in the chart below.

SMA cables are available with a variety of bandwidths. 18 GHz and 26 GHz are standard connector bandwidths. Bandwidth is determined by a combination of insertion and return loss and is a function of both cable loss and connector quality.

K and V are trademarks of Anritsu.
GPO^® and GPPO^® are registered trademarks of Corning-Gilbert.

Posted Comments:

user (posted 2019-03-12 18:33:29.86)

Hi, do the premium cables have a standard cable number (e.g. like RG58, RG316)? Also, can you please provide the k1 and k2 loss coefficients, or provide an equation for attenuation as a function of frequency (not just in the GHz range shown in the plot)? Thanks.

YLohia (posted 2019-04-08 10:40:50.0)

Hello, thank you for contacting Thorlabs. These premium cables do not have a standard cable number such as RG58 or RG316. The loss of the cable assemblies is a combination of loss in the bulk cable and loss in the connectors. The most accurate representation for the cables we have is the information provided in the tables, as this is the actual measured loss of a representative cables. It is difficult to predict the attenuation based on the bulk material alone, as there can be effects causes by each of the individual connectors and also by the interactions between the two connectors separated by the cable. If you are interested, we can share the numerical values that we use to generate the graph on the website which includes measured insertion loss down to 35MHz.

albert.romann (posted 2017-04-20 11:39:21.617)

Hi there, what coax cable is used (make and manufacturer)? Any information about the phase stability at around 24C? Any measured RF parameters (VSWR, return loss,..)

tfrisch (posted 2017-05-03 01:21:36.0)

Hello, thank you for contacting Thorlabs. Please see our specs tab for VSWR and other relevant specs. I would expect the phase to be be stable for a stable temperature. I will reach out to you to discuss your application.

SMP-to-SMP Microwave Cables

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Each Cable is Terminated with SMP Female Connectors

SMP (GPO^®Compatible) Female-to-Female Cables
DC - 18 GHz
3" and 6" Lengths Available

Thorlabs’ SMP-to-SMP Microwave Cables support frequencies from DC up to 18 GHz. Each flexible cable is terminated with an SMP female connector on either end (see the image to the right). They are available in lengths of 3" and 6". Each cable has a low VSWR from DC to 18 GHz as well as a low insertion loss (see Specs tab). In general, we recommend using the shortest cable that is suitable for your application.

The SMP connector can mate directly to a GPO connector. The GPO connector compatibility makes these cables suitable for use with Thorlabs’ Fiber-Coupled EO Modulators.

SMA-to-SMA Microwave Cables

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Each Cable is Terminated with SMA Male Connectors

SMA Male-to-Male Cables
DC - 26 GHz
Seven Available Lengths

Thorlabs’ SMA-to-SMA Microwave Cables support frequencies from DC up to 26 GHz. Each flexible cable is terminated with an SMA male connector on either end (see the image to the right). They are available in lengths ranging from 3" to 120". Each cable has a low VSWR from DC to 26 GHz as well as a low insertion loss (see Specs tab). In general, we recommend using the shortest cable that is suitable for your application.

The SMA connector can mate directly to a 2.92 mm, 3.5 mm, or K connector. As a result, these cables are compatible with many of Thorlabs’ High-Speed Detectors or Fiber-Coupled EO Modulators that use SMA connectors.

2.4 mm-to-2.4 mm Microwave Cables

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Each Cable is Terminated with 2.4 mm Male Connectors

2.4 mm Male-to-Male Cables
DC - 50 GHz
Five Available Lengths

Thorlabs’ 2.4 mm-to-2.4 mm Microwave Cables support frequencies from DC up to 50 GHz. Each flexible cable is terminated with a 2.4 mm male connector on either side (see image to the right). They are available in lengths of 4", 8", 12", 24", or 36". Each cable has a low VSWR from DC to 50 GHz as well as a low insertion loss (see Specs tab). In general, we recommend using the shortest cable that is suitable for your application.

The 2.4 mm connector can mate directly to a 1.85 mm or V connector. As a result, these cables are compatible with Thorlabs’ 40 GHz EO Phase and Intensity Modulators that use a V connector.

2.92 mm-to-2.92 mm Microwave Cables

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Each Cable is Terminated with 2.92 mm Male Connectors

2.92 mm Male-to-Male Cables
DC - 40 GHz
Six Available Lengths

Thorlabs’ 2.92 mm-to-2.92 mm Microwave Cables support frequencies from DC up to 40 GHz. Each flexible cable is terminated with a 2.92 mm male connector on either end (see image to the right). They are available in lengths ranging from 4" to 72". Each cable has a low VSWR from DC to 40 GHz as well as a low insertion loss (see Specs tab). In general, we recommend using the shortest cable that is suitable for your application.

The 2.92 mm connector can mate directly to an SMA, 3.5 mm, or K connector. As a result, these cables are compatible with many of Thorlabs’ High-Speed Detectors that use SMA connectors.

SMA-to-SMP Microwave Adapter Cables

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Specifications^a
Item #	SMGF3	SMGF6	SFGF3	SFGF6
Length	3"	6"	3"	6"
Adapter Style (Click for Image)	SMA Male to SMP Female		SMA Female to SMP Female
Frequency Range	DC - 18 GHz

For complete specifications, see the Specs tab.

SMA-to-SMP Adapter Cables
DC - 18 GHz
Available with SMA Male or Female Connector to SMP Female Connector

These adapter cables have SMP female connector on one end and either a male or female SMA connector on the other. Each style of adapter cable is available in 3" or 6" lengths. Each cable has a low VSWR from DC to 18 GHz as well as a low insertion loss (see Specs tab). In general, we recommend using the shortest cable that is suitable for your application.

The SMP connector can mate directly to a GPO connector, while the SMA connector can mate directly to a 2.92 mm, 3.5 mm, or K connector. The GPO connector compatibility makes these cables suitable for use with Thorlabs’ Fiber-Coupled EO Modulators.

SMPM-to-2.92 mm Microwave Adapter Cables

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Each Cable is Terminated with SMPM Female Connectors and 2.92 Male Connectors

SMPM (SSMP and GPPO^®Compatible) Female to 2.92 mm Male Cables
DC - 40 GHz
4", 12", and 24" Lengths Available
Sold as Phase-Matched Pairs

Thorlabs’ SMPM-to-2.92 mm Microwave Cables support frequencies from DC up to 40 GHz. Each flexible cable is terminated with an SMPM female connector on one end, and a 2.92 mm male connector on the other end (see the image to the right). They are available in lengths of 4", 12", and 24". Each cable has a low VSWR from DC to 20 GHz and from DC to 40 GHz, as well as a low insertion loss (see Specs tab). In general, we recommend using the shortest cable that is suitable for your application.

The SMPM connector can mate directly to a SSMP or GPPO^® connector, while the 2.92 mm connector can mate directly to an SMA, 3.5 mm, or K connector.

All cables are sold in phase-matched pairs and can be used with our High-Speed Photoreceivers for OEM and Fiber-Coupled EO Modulators.

2.4 mm-to-2.92 mm Microwave Adapter Cables

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Specifications^a
Item #	TMKM4	TMKF4	TFKM4	TFKF4
Length	4"
Adapter Style (Click for Image)	2.4 mm Male to 2.92 mm Male	2.4 mm Male to 2.92 mm Female	2.4 mm Female to 2.92 mm Male	2.4 mm Female to 2.92 mm Female
Frequency Range	DC - 40 GHz

For complete specifications, see the Specs tab.

2.4 mm-to-2.92 mm Adapter Cables
DC - 40 GHz
Available with 2.4 mm Male or Female Connector to 2.92 mm Male or Female Connector

These adapter cables go from either a female or 2.4 mm male connector to either a 2.92 mm male or female connector. Each cable has a low VSWR from DC to 40 GHz as well as a low insertion loss (see Specs tab).

The 2.4 mm connector can mate directly to a 1.85 mm or V connector, while the 2.92 mm connector can mate directly to an SMA, 3.5 mm, or K connector. The V connector is directly compatible with Thorlabs’ 40 GHz EO Phase and Intensity Modulators. For easy identification, the 2.4 mm connector end has a grooved locking nut.

Microwave Cable Adapters

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Common Specifications
Impedance	50 Ω
Durability	500 Connection Cycles
Material	Stainless Steel (303)
Conductor	Gold-Plated Brass (M) or Gold-Plated BeCu (F)
Coupling Torque	8 in-lbs (0.9 N-m)
Coupling Nut Hex Size	5/16"

Adapters for 2.4 mm or 2.92 mm Connectors
DC - 40 GHz or DC - 50 GHz

These microwave cable adapters are designed to change the gender or connector type of microwave cables and connectors. They include in-series adapters (F-F, F-M, M-F) for 2.92 mm and 2.4 mm, as well as between-series adapters for all gender combinations of 2.92 mm and 2.4 mm cables.

Specifications
Adapter Type	2.92 mm			2.4 mm			2.4 mm to 2.92 mm
Item #	KFF	KMF	KMM	TFF	TMF	TMM	TFKF	TFKM	TMKF	TMKM
Photo (Click to Enlarge)
Adapter Style (Click for Image)	2.92 mm F. to 2.92 mm F.	2.92 mm M. to 2.92 mm F.	2.92 mm M. to 2.92 mm M.	2.4 mm F. to 2.4 mm F.	2.4 mm M. to 2.4 mm F.	2.4 mm M. to 2.4 mm M.	2.4 mm F. to 2.92 mm F.	2.4 mm F. to 2.92 mm M.	2.4 mm M. to 2.92 mm F.	2.4 mm M. to 2.92 mm M.
VSWR	1.2								1.25
Frequency Range	DC - 40 GHz			DC - 50 GHz			DC - 40 GHz
Length	19.00 mm	20.10 mm	21.20 mm	19.10 mm	18.15 mm	17.20 mm	20.40 mm	21.50 mm	19.45 mm	20.55 mm

Based on your currency / country selection, your order will ship from Newton, New Jersey

+1 Qty Docs Part Number - Universal Price Available

KFF	Microwave Cable Adapter, 2.92 mm Female to 2.92 mm Female

$91.04

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KMF	Microwave Cable Adapter, 2.92 mm Male to 2.92 mm Female

$91.04

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KMM	Microwave Cable Adapter, 2.92 mm Male to 2.92 mm Male

$91.04

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TFF	Microwave Cable Adapter, 2.4 mm Female to 2.4 mm Female

$182.07

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TMF	Microwave Cable Adapter, 2.4 mm Male to 2.4 mm Female

$182.07

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TMM	Microwave Cable Adapter, 2.4 mm Male to 2.4 mm Male

$182.07

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TFKF	Microwave Cable Adapter, 2.4 mm Female to 2.92 mm Female

$149.94

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TFKM	Microwave Cable Adapter, 2.4 mm Female to 2.92 mm Male

$149.94

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TMKF	Microwave Cable Adapter, 2.4 mm Male to 2.92 mm Female

$149.94

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TMKM	Microwave Cable Adapter, 2.4 mm Male to 2.92 mm Male

$149.94

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Preset Torque Wrenches for Microwave Cable Connectors

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The break-over design will cause the pivot point to "break" when the preset torque is achieved, preventing additional force from being applied.

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Each Wrench is Engraved for Easy Identification in the Field

Break-Over Design Ensures Proper Mating Torque is Supplied
Preset Torque Values to Prevent Over-Tightening Connectors
- TQW5A: 5 in-lbs (0.57 N•m) for Most SMA Connectors
- TQW8A: 8 in-lbs (0.90 N•m) for 3.5 mm, 2.92 mm, 2.4 mm, 1.85 mm, K, and V Connectors
Engraved with Preset Torque Value, Torque Direction, Wrench Size, and Item #
Ideal for Use with Our Premium Microwave Cables and Adapters

These 5/16” Torque Wrenches have a preset torque value to ensure that the proper amount of torque is supplied when mating two coaxial connectors. The TQW5A is set to provide 5 in-lbs of torque, which is ideal for most SMA connectors, while the TQW8A is set to provide 8 in-lbs of torque, which is ideal for 3.5 mm, 2.92 mm, 2.4 mm, 1.85 mm, K, and V connectors.

When the preset torque value has been achieved, the break-over design will cause the pivoting joint to "break", as shown in the image to the right. This will prevent further force from being applied to the connector. The wrench's hex head will move back into place once the force is removed. The torque wrench should be held at the load-point line inscribed near the end of the handle; holding the handle at a different location will affect the amount of torque applied to the connector. The specified torque is guaranteed only when tightening in the direction indicated by the arrow engraved on the handle. Each wrench is engraved with its preset torque value, torque direction, wrench size, and item # for easy identification in the field.

The preset torque value for each wrench is guaranteed for one year from the date of purchase. If necessary, wrenches may be returned to Thorlabs for recalibration, please contact Tech Support for details.