For most screws, crests and roots do not terminate at a sharp point, so crest and root truncation values are included in the definitions of major and minor diameter. The pitch diameter is approximately halfway between the major and minor diameters.
Thread Form A thread form is a set of rules that define the features' scale relative to one another. There are many thread forms in the Unified screw thread standard designated by either UN, which defines a flat root contour, or UNR, which defines a round root contour. These can be further described by appending more letters. For example, an extremely fine thread with a flat root contour is designated UNEF.
Those forms which are not standardized by the Unified screw thread system are designated UNS. Thread Series Most screws are identified by their thread series.
Thread series are denoted by the major diameter and density of threads. Unified threads specify density in threads per inch, while Metric threads specify the thread pitch. In metric nomenclature, an M4 x 0. The term M4 x 0. Thread Class The tolerances and allowances on a thread series are given by a thread class. Unified thread classes are alphanumeric identifiers starting with a number from 1 through 3, where 1 is the loosest tolerance and 3 is the tightest, and either A for external threading or B for internal threading.
Metric threads have a slightly more complex tolerancing method that uses tolerancing grades, designated by a number 3 through 9; and tolerancing positions, which use letters e through h. Grades provide a measure of the tolerance itself: the smaller the number, the tighter the tolerance.
Positions denote the distance of the tolerance from the pitch diameter. Uppercase positioning letters indicate internal threads while lowercase positioning letters indicate external threads. Quoting from the Machinery's Handbook, 29th Edition, p. If the two grades and positions are identical, it is not necessary to repeat the symbols, thus 4g, alone, stands for 4g4g and 5H, alone, stands for 5H5H.
Thorlabs' SM Series Threads Threading specifications for our SM threads, utilized in our lens tube and cage system components, are given below so that you can machine mating components to suit your application. We also offer products with C-Mount and RMS threads, and the specifications for these threads are given below for reference. For other thread specifications that are not listed here, please contact Tech Support. Their stackable design and direct interfacing with all SM2-threaded 2.
Therefore, optics housed inside can be accessed from both ends. Simply thread the first retaining ring to the desired depth, add the optic, and then use a second retaining ring to secure the optic. Optics can be manually adjusted via the side slots without the use of a spanner wrench. The rotatable slip shield included with the lens tube fits over the lens tube slots to prevent unwanted light from entering the system and to keep the optical setup free from debris. Two retaining rings and one black plastic dust cover are included with each lens tube.
The SM2E60 6" Long Extension Tube is designed to enable longer distances between optical components in lens tube systems that utilize lenses with large focal lengths. Although the ends of these extension tubes are threaded to accept our SM2 series stackable lens tubes, they feature thicker walls than our standard lens tubes, which leads to greater rigidity.
We offer five different SM2-threaded 2. Please keep in mind that due to the increased thickness of some retaining rings, the maximum optic thickness that can be housed inside our standard SM2-compatible mounts will be diminished in some cases. Spanner Wrenches We offer two spanner wrench choices that can be used with these retaining rings. The SPW Spanner Wrench has a hollow design that enables retaining rings for our SM2 lens tubes to be adjusted and installed without obscuring the beam path.
The handle is knurled for improved grip. Please note that the SPW wrench can withstand a maximum torque of 80 inch-pounds. These cookies control core features for Thorlabs and the website cannot function properly without them. Lens Tube Couplers. Adapters Selection Guide. Lens Tube Mounts. Lens Tube Covers. Quick-Release Adapters. Soft-Jaw Pliers. SM-Compatible Kinematic Mounts. End Caps. Rotation Mounts. Optic Mounts. Cage Systems. Lens Tube Systems. Please Wait. Click to Enlarge When an engraved lens tube is attached to another lens tube, the engraving of the connected end is no longer visible.
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