Finishes and Plating Guide
Regulation / Directive Conformance
Thread Specifications
Standard Finish Summary
The following summary is brief description Lyn-Tron's standard finish summary. The document is organized with the Lyn-Tron's Plate Code proceeded by the standard Lyn-Tron plating name and a brief explanation of the finish. The Lyn-Tron Plate Code is represented as numeric/alphanumeric value and is between two and three characters long. The plate code will always be listed at the end of the Lyn-Tron part number.
Please click on the finish name link below to review the suggested material that the selected finish can be applied to.
Anodize
- Acid Electrolyte treatment which penetrates the metal and builds up
- Rough-etched appearance, hard oxide surface
- Applied on aluminum
- Excellent corrosion and abrasion resistance
- Non-conductive
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Lyn-Tron Plate Codes
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08 - Clear Chromic Acid Anodize
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09 - Red Anodize
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10 - True Green Anodize
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11 - Dark Grey Anodize -- Type 1
- Chromic 0.5µ-7.6µ
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111 - Dark Grey Anodize -- Type 2
- Sulfuric 1.8µ-25.4µ
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12 - Clear Anodize
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121 - Hard Clear Anodize -- Type 3 - Class 1
- MIL-A-8625
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14 - Black Anodize -- Type 2
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141 - Hard Black Anodize -- Type 3
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15 - Clear Semi-Frost Anodize
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16 - Black Semi-Frost Anodize
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17 - Clear Satin Anodize
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18 - Black Satin Anodize
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19 - Black Bright Anodize
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20 - Clear Bright Anodize
Bright Dip
- An Acid bath etching process
- Used on brass parts
- Process removes any metal particulate that may be on the part
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Lyn-Tron Plate Codes
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03 - Bright Dip
Cadmium
- Cadmium can be electroplated on most metals
- It is commonly used on brass and steel
- Appearance is typically bright
- Lyn-Tron offers a type II with a supplementary chromate treatment
- Cadmium offers excellent corrosion protection
- It offers excellent protection in marine environments
- Should not be exposed to continuous temperatures of over 150 degrees F.
- Non magnetic and cannot be soldered
- This plating has been used as a suitable alternative to E-nickel or zinc plating
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Lyn-Tron Plate Codes
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31 - Clear Cadmium
- QQ-P-416 Type 1 Class 2
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311 - Clear Cadmium -- Type 2 -- Class 3
- QQ-P-416 Type 2 Class 3
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31H - Clear Cadmium Heat Treated
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32 - Yellow Cadmium
- QQ-P-416 Type 2 Class 2
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32H - Yellow Cadmium Heat Treated
Caustic Etched
- An acid bath process primarily used on aluminum
- Typically finished with an Anodized plate
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Lyn-Tron Plate Codes
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02 - Caustic Etch
Chemical Film
- This process is used on RoHS aluminum
- Parts are dipped in a chemical
- Process makes no dimension changes in the part
- It offers good corrosion resistance and is electrically conductive
- Abrasion resistance is poor with this finish
- Common brand names are Iridite and Alodine.
- Lyn-Tron uses 14-2 Iridite. This finish is gold unless otherwise requested.
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Lyn-Tron Plate Codes
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21 - Clear Iridite Class 3
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211 - Clear Iridite Class 1A
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22 - Gold Iridite Class 1A
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221 - Gold Iridite Class 3
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222 - Gold Iridite - Honeywell Approved
- MIL-C-5541 CLASS 1A, Rev: E
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223 - Gold Iridite - Honeywell Approved
- M690278-2, Class 3
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24 - Blue Iridite
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25 - Clear Iridite Class 3 (RoHS)
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25H - Clear Iridite Class 3 (RoHS) with Heat Treat
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25P - Clear Iridite Class 3 (RoHS) with Nylock Patch
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26 - Gold Iridite Class 1A (RoHS)
Chrome
- Chrom is a technique of electroplating a thin layer of chromium onto a metal object
- The chromed layer can be decorative, provide corrosion resistance, ease cleaning procedures, or increase surface hardness
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Lyn-Tron Plate Codes
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71 - Chrome -- Bright
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72 - Chrome -- Satin
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73 - Chrome/Electroless Nickel
Copper / Nickel / Bright Tin
- Copper plating is primary used as an undercoat to improve adhesion and to prevent impurities forming on the base metal and migrating through.
- Can affect solderability.
- Can be done to most metals
- Offers only fair resistance to corrosion
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Lyn-Tron Plate Codes
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48 - Copper/Nickel/Bright Tin
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48H - Copper/Nickel/Bright Tin + Heat Treated
Electro Tin
- Electroplated tin provides very good resistance to corrosion.
- When applied to a proper thickness this finish meets a 24 hour 20% salt spray requirement.
- Can be soldered
- Is ductile
- Available either bright or dull finishes
- Bright tin looks cosmetically better then dull tin and has better corrosion resistance. When exposed to low temperatures (-40° F) this finish changes structure and loses adhesion.
- The expected shelf life of Electro Tin is approximately six months from the date plated. To ensure maximum shelf life -- parts should be sealed in an airtight container with desiccant.
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Lyn-Tron Plate Codes
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42 - Electro Tin -- Dull
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42H - Electro Tin -- Dull Heat Treated
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43 - Electro Tin -- Bright
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43H - Electro Tin -- Bright + Heat Treat
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44 - Electro Tin -- Solder
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44H - Electro Tin -- Solder -- Heat Treat
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4A - Electro Tin -- Bright .0002-.0004 Tin .00002 CU
Finishing Process
- The finished product of finishing process
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Lyn-Tron Plate Codes
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00 - Unplated
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00H - Heat Treat - Unplated
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00M - Unplated -MCM
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00P - Nylock Patch - Unplated
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00Q - Nylock Pellet - Unplated
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00S - Marking Stamp - Unplated
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74 - Brushed Aluminum
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89 - Electropolish
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99 - Rust Inhibitor
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99T - Rust Inhibitor + Carburize .005-.010 to HRC 35-42
Gold
- Gold plating is a method of depositing a thin layer of gold onto the surface of another metal, most often copper or silver, by chemical or electrochemical means
- Mechanical or chemical affixing of thin gold foils onto the surface of objects is instead known as gilding
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Lyn-Tron Plate Codes
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94 - Gold (.00005/.00007)
- MIL-G-45204, CL 1, Type II
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96 - Gold (.00005 - .0000315) / Nickel Flash
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97 - Gold (.00003 Min)
- MIL-G-45204, Type II
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98 - Hard Gold / Nickel / Copper Strike
Nickel
- Nickel provides a silver finish and can be plated on most metals
- Offers very good resistance to corrosion
- Can deposited in either a soft or hard finish (dull or bright)
- Corrosion resistance is a function of plate thickness
- Some forms of this finish may be slightly magnetic.
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Lyn-Tron Plate Codes
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61 - Nickel
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61P - Nickel w/ Patch
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62 - Black Nickel
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63 - Ductile Nickel
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634 - Sulfamate Nickel ASM B 687-97 Type II Class 10
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63H - Ductile Nickel + Heat Treat
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63P - Ductile Nickel with Nylock Patch
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64 - Nickel without Copper Under Plating
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66 - Electroless Nickel
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661 - Nickel - Molex
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66P - Electroless Nickel with Nylock Patch
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81 - Black Chrome/Chromium/Nickel
Nylon Dye
- A dye can generally be described as a colored substance that has an affinity to the substrate to which it is being applied
- The dye is generally applied in an aqueous solution, and may require a mordant to improve the fastness of the dye on the fiber
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Lyn-Tron Plate Codes
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83 - Black Dye
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84 - Blue Dye
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85 - Red Dye
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86 - Green Dye
Oxide
- Finish is mostly decorative
- Has limited corrosion protection in mild conditions
- Dimensional changes are immeasurable.
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Lyn-Tron Plate Codes
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50 - Black Oxide -- Steel
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50P - Black Oxide -- Steel with Nylock Patch
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51 - Black Oxide -- Brass
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52 - Black Oxide -- Stainless Steel
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521 - Black Oxide after Passivate -- Stainless Steel
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522 - Black Oxide after Passivate with Heat Treat -- SS
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52W - Black Oxide - Wax Coating -- Stainless Steel
Passivate
- Chemical treatment used on Stainless Steel
- Process makes no dimension changes in the part
- Treatment removes iron particles and creates an etched passive surface. (Nitric acid -- dissolve's iron)
- Process purifies the surface and improves corrosions resistance.
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Lyn-Tron Plate Codes
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01 - Passivate
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011 - Passivate (Nitric)
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01E - Passivate with Electro Polish
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01H - Passivate + Heat Treat
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01M - Passivate - MCM
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01P - Passivate with Nylock Patch
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01Q - Passivate with Nylock Pellet
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01S - Passivate with Marking Stamp
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06 - Passivate -- Type 2
Silver
- This is an expensive finish
- Provides excellent electrical conductivity
- Soft and solderable.
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Lyn-Tron Plate Codes
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91 - Silver
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92 - Silver/Nickel
- ASTM B700 QQ-S-365
Solder
- Soldered finish offers the best solderability
- Can be fused
- Non-magnetic
- 60% tin, 40% lead
- Should not be used on parts of irregular configuration or those with deep recesses.
- The expected shelf life of Solder is approximately six months from the date plated. To ensure maximum shelf life -- parts should be sealed in an airtight container with desiccant.
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Lyn-Tron Plate Codes
Zinc
- Corrosion resistant
- Conductive
- Inexpensive
- Can be applied in a wide range of thickness
- In time this finish will weather and turn to a drab gray color
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Lyn-Tron Plate Codes
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33 - Black Zinc
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34 - Zinc Clear Chromate
- QQ-Z-325 Type 2 Class 3 -- ASTM B 633 Type 3 SC 1
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342 - Zinc Clear Chromate
- QQ-Z-325 Type 3 Class 2
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343 - Zinc Clear ASTM B 633 Type3 SC3 (72hr salt)
- ASTM B 633 Type 3 SC3 (72hr salt)
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345 - Zinc Clear ASTM B 633 Type3 SC2 (bake after plate)
- ASTM B 633 Type 3 SC2 (.0003 min.)
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347 - Zinc Clear ASTM B 633 Type3 SC2 (96hr salt)
- ASTM B 633 Type 3 SC2 (96hr salt)
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34H - Zinc Clear Heat Treated
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34P - Zinc Clear Nylock Patch
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35 - Zinc Clear -- No Chromate
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35P - Zinc Clear with Nylock Patch
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36 - Zinc Yellow Chromate
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363 - Zinc Yellow Chromate ASTM B633 Type 2 SC3 (0.0005)
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36H - Zinc Yellow Heat Treat
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36P - Zinc Yellow Nylock Patch
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37 - Zinc Yellow (RoHS)
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37P - Zinc Yellow (RoHS) Nylock Patch
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38 - Black Zinc (RoHS)
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53 - Black Zinc/Copper
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53P - Black Zinc/Copper Strike Nylock Patch
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54 - Black Zinc/Copper Strike (RoHS)
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55 - Nickel/Copper Strike( .0001) - Steel
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56 - Black Zinc/Nickel Strike
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80 - Zinc Yellow Leach Back Bronze








