Technical Specifications

KATO CoilThread inserts meets and exceeds all applicable military, aerospace, and commerical standards. For more information on the standards see Aerospace & Inserts Specs in KATOpedia. For fast, accurate technical information and part numbers on specific sizes try out the KATO Product Wizard.

Tangless CoilThread

Free-Running Inserts

SpecPic

Self-Locking Inserts

SpecPic

CoilThread (Tanged)

Free-Running Inserts

SpecPic

Self-Locking Inserts

SpecPic
Free-Running or Locking Plating/Coating Color/Finish Related Spec Maximum Thickness (inches)
Free-RunningUnplatedBright Stainless Steel Finish––
LockingPrinter InkRed1 –N/A (dyed red for identification)
Free-RunningCadmiumGold to YellowAMS-QQ-P-416 (Type II)0.0001 (0.003mm)
LockingCadmiumOlive Drab to Dark BrownAMS-QQ-P-416 (Type II)0.0001 (0.003mm)
Free-Running & LockingDry Film LubricantDark Gray to BlackAS5272 (Type I)0.0003 - 0.00052

Please Note:

  1. May be completely or partially covered.
  2. On average (of 6 readings). No single reading to be less than 0.0002 or greater than 0.0007.
  3. All non-plated KATO Locking CoilThread inserts (Tangless and tanged) are dyed red for identification in accordance with NAS1130, NA0276, and NASM21209. The red dye is printer’s ink and may be removed with a cleaning solution.
  4. Dry Film Lubricant and/or the Cadmium plating are called out in NAS1130, NASM21209, NA0276, MA3280, MA3281, MA3330, and MA3331. Any other coatings or platings will deviate from these specifications.

Inserts Dimensions


Thread
Size		 Nominal Length1 Free Outer Diameter Number of Free Coils2
Length of Insert (in Diameter) Nominal Length Diameter
1 1.5 2 2.5 3 Min. Max. 1 1.5 2 2.5 3
Unified Coarse
1-640.0730.1100.1460.1820.2190.0950.1032-3/44-7/86-7/88-7/810-7/8
2-560.0860.1290.1720.2150.2580.1100.11935-1/47-3/89-5/811-7/8
3-480.0990.1480.1980.2480.2970.1280.1392-7/857-1/49-3/811-1/2
4-400.1120.1680.2240.2800.3360.1440.1592-3/44-3/46-3/48-7/810-7/8
5-400.1250.1880.2500.3120.3750.1580.1733-1/45-1/27-3/41012-1/4
6-320.1380.2070.2760.3450.4140.1780.1932-3/44-3/46-7/88-7/810-7/8
8-320.1640.2460.3280.4100.4920.2050.2203-1/268-3/810-3/413-1/4
10-240.1900.2850.3800.4750.5700.2440.2592-7/857-1/89-1/411-3/8
12-240.2160.3240.4320.5400.6480.2700.2853-1/268-3/810-5/813-1/8
1/4-200.2500.3750.5000.6250.7500.3100.3303-3/85-3/4810-3/812-3/4
5/16-180.3120.4690.6250.7810.9380.3800.40046-5/89-1/411-7/814-5/8
3/8-160.3750.5620.7500.9381.1250.4520.4724-3/87-1/41012-7/815-3/4
7/16-140.4380.6560.8751.0941.3120.5260.5514-1/27-3/810-1/413-1/816-1/8
1/2-130.5000.7501.0001.2501.5000.5970.6224-7/87-7/81114-1/817-1/8
9/16-120.5620.8441.1251.4061.6880.6690.6945-1/88-1/411-1/214-3/417-7/8
5/8-110.6250.9381.2501.5621.8750.7420.7675-1/48-1/211-3/41518-3/8
3/4-100.7501.1251.5001.8752.2500.8810.9065-7/89-3/81316-1/220-1/8
7/8-90.8751.3121.7502.1882.6251.0221.0526-1/41013-3/417-1/221-1/4
1-81.0001.5002.0002.5003.0001.1661.1966-3/810-1/81417-3/421-5/8
1-1/8-71.1251.6882.2502.8123.3751.3151.3556-1/89-7/813-5/817-1/221-1/4
1-1/4-71.2501.8752.5003.1253.7501.4431.483711-1/415-3/819-1/223-3/4
1-3/8-61.3752.0622.7503.4384.1251.5981.6436-1/210-1/214-3/818-3/822-1/4
1-1/2-61.5002.2503.0003.7504.5001.7271.7727-1/411-1/215-7/820-1/824-1/2
Unified Fine
0-800.0600.0900.120------------35-1/27-3/8------
3-560.0990.1480.1980.2480.2970.1310.1463-3/85-5/8810-3/812-5/8
4-480.1120.1680.2240.2800.3360.1470.1623-3/85-5/87-7/810-1/412-1/2
6-400.1380.2070.2760.3450.4140.1730.1933-1/268-3/810-3/413-1/4
8-360.1640.2460.3280.4100.4920.2040.2243-7/86-1/29-1/811-5/814-1/4
10-320.1900.2850.3800.4750.5700.2360.2564-1/86-7/89-1/212*14-7/8
1/4-280.2500.3750.5000.6250.7500.3060.32658-1/411-3/814-1/217-5/8
5/16-240.3120.4690.6250.7810.9380.3800.4005-1/28-7/812-1/415-5/819
3/8-240.3750.5620.7500.9381.1250.4480.4686-7/8111519-1/823-1/8
7/16-200.4380.6560.8751.0941.3120.5240.5496-5/810-5/814-5/818-1/222-1/2
1/2-200.5000.7501.0001.2501.5000.5920.6177-7/812-3/816-7/821-3/825-7/8
9/16-180.5620.8441.1251.4061.6880.6660.691812-1/217-1/821-3/426-1/4
5/8-180.6250.9381.2501.5621.8750.7330.758914-1/819-1/424-1/429-3/8
3/4-160.7501.1251.5001.8752.2500.8760.9019-3/415-1/820-5/82631-1/2
7/8-140.8751.3121.7502.1882.6251.0211.0519-7/815-1/221-1/826-5/832-1/4
1-121.0001.5002.0002.5003.0001.1691.1999-5/81520-1/22631-1/2
1-1/8-121.1251.6882.2502.8123.3751.3041.33411-1/817-1/423-3/829-1/235-3/4
1-1/4-121.2501.8752.5003.1253.7501.4391.46912-1/219-3/826-1/43339-7/8
1-3/8-121.3752.0622.7503.4384.1251.5751.61013-3/421-3/828-7/836-1/244
1-1/2-121.5002.2503.0003.7504.5001.7101.74515-1/423-1/231-5/839-7/848-1/8

Please Note:

  • All dimensions for unified sizes are in inches.

Thread
Size		 Nominal Length1 Free Outer Diameter Number of Free Coils2
Length of Inserts (in Diameter) Nominal Length Diameter
1 1.5 2 2.5 3 Min. Max. 1 1.5 2 2.5 3
Metric Coarse
M2X.42.03.04.05.06.02.502.703-1/45-1/27-3/410-1/812-3/8
M2.2X0.452.23.34.45.56.62.803.003-1/85-3/87-5/89-7/812-1/8
M2.5X0.452.53.85.06.37.53.203.703-3/85-3/48-1/810-1/212-3/4
M3X0.53.04.56.07.59.03.804.353-3/46-3/88-7/811-3/813-7/8
M3.5X0.63.55.37.08.810.54.404.953-3/46-3/88-3/411-3/813-3/4
M4X0.74.06.08.010.012.05.055.603-5/86-1/88-5/811-1/813-5/8
M5X0.85.07.510.012.515.06.256.804-1/86-7/89-5/812-3/815-1/8
M6X16.09.012.015.018.07.407.9546-3/49-1/212-1/814-7/8
M7X17.010.514.017.521.08.659.204-7/8811-1/814-1/817-1/4
M8X1.258.012.016.020.024.09.8010.354-1/27-3/810-1/413-1/416-1/8
M10X1.510.015.020.025.030.011.9512.504-7/8811-1/814-1/417-3/8
M12X1.7512.018.024.030.036.014.3015.0058-1/411-1/214-5/817-7/8
M14X214.021.028.035.042.016.6517.355-1/88-1/211-3/41518-3/8
M16X216.024.032.040.048.018.9019.606-1/89-3/413-1/217-1/421
M18X2.518.027.036.045.054.021.3022.005-3/88-7/812-1/415-5/819
M20X2.520.030.040.050.060.023.5524.406-1/89-7/813-5/817-3/821-1/8
M22X2.522.033.044.055.066.025.9026.906-3/410-7/814-7/81923-1/8
M24X324.036.048.060.072.028.0029.006-1/81013-3/417-1/221-3/8
M27X327.040.554.067.581.031.4032.40711-1/415-1/219-3/424
M30X3.530.045.060.075.090.034.8036.006-3/410-3/414-7/818-7/823
M33X3.533.049.566.082.599.037.8039.207-1/21216-1/22125-3/8
M36X436.054.072.090.0108.041.5042.907-1/811-3/815-5/819-7/824-1/4
M39X439.058.578.097.5117.044.6046.007-7/812-1/217-1/821-3/426-3/8
Metric Fine
M8X18.012.016.020.024.09.7010.255-7/89-3/81316-1/220-1/8
M10X110.015.020.025.030.011.9512.507-5/81216-1/22125-1/2
M10X1.2510.015.020.025.030.012.1012.655-7/89-1/213-1/816-3/420-3/8
M12X1.2512.018.024.030.036.014.3015.007-1/411-5/815-7/820-1/424-1/2
M12X1.512.018.024.030.036.014.2514.9569-5/813-3/81720-3/4
M14X1.514.021.028.035.042.016.5517.257-1/811-3/815-5/82024-1/4
M16X1.516.024.032.040.048.018.9019.608-1/413-1/81822-3/427-5/8
M18X1.518.027.036.045.054.021.0521.759-1/21520-3/825-7/831-3/8
M20X1.520.030.040.050.060.023.1524.0010-3/416-7/822-7/828-7/835
M22X1.522.033.044.055.066.025.5526.4511-7/818-1/225-1/831-5/838-1/4
M18X218.027.036.045.054.021.1521.85711-1/815-3/819-1/223-5/8
M20X220.030.040.050.060.023.2024.057-7/812-1/217-1/427-7/826-1/2
M22X222.033.044.055.066.025.6026.508-3/413-3/418-7/823-7/829
M24X224.036.048.060.072.028.1029.109-1/21520-3/825-7/831-3/4
M27X227.040.554.067.581.031.3032.3010-7/81723-1/429-3/835-1/2
M30X230.045.060.075.090.034.5035.7012-1/419-1/825-7/832-3/439-1/2
M33X233.049.566.082.599.037.8039.2013-5/821-1/828-5/83643-1/2
M36X236.054.072.090.0108.041.0042.401523-1/431-3/839-1/247-3/4
M39X239.058.578.097.5117.044.3045.7016-3/825-1/434-1/84351-7/8
M36X336.054.072.090.0108.041.3042.709-3/415-1/420-7/826-1/232
M39X339.058.578.097.5117.044.4045.8010-3/416-3/422-3/428-7/834-7/8

Please Note:

  • Nominal length is a calculated number and cannot be measured in the free state. It is the actual installed length plus 1/2 pitch.
  • For Tangless CoilThread inserts, the number of free coils is the total number of convolutions (counted from notch to notch) and has a tolerance of ±1/4 coil. For CoilThread (tanged) inserts, the number of free coils is the total number of convolutions and has a tolerance of ±1/4 coil. Convolutions are counted by starting  90° from the tang for all sizes.
  • Tangless inserts are available for select UNC & UNF sizes up to 3/8", and select metric coarse sizes up to M12.
  • All dimensions for reference only.

Inserts Weight for wide range of sizes

Insert Weights



All dimensions are are for reference only.

Insert Size1D LBS/1001.5D LBS/1002D LBS/1002.5D LBS/1003D LBS/100
Unified Coarse
1-640.0040.0070.011------
2-560.0050.0080.0120.0150.018
3-480.0080.0130.0170.0220.027
4-400.0120.0200.0270.0350.042
5-400.0150.0250.0350.0440.054
6-320.0240.0380.0530.0670.081
8-320.0360.0560.0780.1010.125
10-240.0570.0900.1330.1720.219
12-240.0770.1190.1720.2080.279
1/4-200.1450.1960.3080.3850.490
5/16-180.2320.3690.5100.6580.806
3/8-160.3910.6250.8621.0641.316
7/16-140.6670.9431.2501.6672.000
1/2-130.7941.3161.8522.2732.857
9/16-121.2351.9612.6323.2264.000
5/8-111.5152.4393.4484.3485.263
3/4-102.7784.0005.2636.6678.333
7/8-94.5456.2508.33310.00012.500
1-85.8829.09112.50014.28616.670
1-1/8-78.39212.92817.46422.00026.536
1-1/4-710.48716.07021.65327.23632.819
1-3/8-614.50522.26430.12237.98145.839
1-1/2-617.56326.91536.26845.62054.972
Unified Fine
0-800.0040.0070.011------
3-560.0050.0080.0120.0190.023
4-480.0100.0160.0220.0290.035
6-400.0200.0300.0410.0510.062
8-360.0330.0500.0680.0860.103
10-320.0470.0780.1120.1400.170
1/4-280.1090.1550.2120.2760.338
5/16-240.1800.2840.3970.4900.602
3/8-240.2590.4200.5530.7090.862
7/16-200.4590.6990.9171.2501.493
1/2-200.5950.9091.2341.5631.887
9/16-180.8261.2661.6952.1282.564
5/8-181.0101.5622.0832.6323.030
3/4-161.6952.5643.4484.3485.263
7/8-142.5644.0005.2636.6677.692
1-123.8756.0638.18810.40612.815
1-1/8-124.9177.57210.22712.88215.536
1-1/4-126.2549.50212.75015.99819.246
1-3/8-127.35911.27615.19419.11123.028
1-1/2-128.79913.65018.50123.35228.203
Metric Coarse
M2X.40.0040.0070.0110.0150.018
M2.2X0.450.0040.0090.0130.0180.020
M2.5X0.450.0070.0130.0180.0220.026
M3X.50.0130.0200.0260.0350.042
M3.5X0.60.0200.0310.0440.0570.068
M4X0.70.0310.0480.0680.0860.106
M5X0.80.0550.0880.1210.1540.187
M6X10.0970.1580.2180.2770.337
M7X10.1360.2180.2990.3810.462
M8X1.250.2200.3520.4860.6180.752
M10X1.50.4140.6640.9151.1661.415
M12X1.750.7001.1201.5401.9582.378
M14X21.0931.7472.4003.0543.707
M16X21.4632.3173.1704.0224.875
M18X2.52.2683.6194.9686.3187.669
M20X2.52.8534.5196.1867.8529.517
M22X2.53.5055.5227.5379.55211.570
M24X34.9267.80610.68513.56516.443
M27X36.3459.98813.63117.28320.920
M30X37.94412.44316.94021.43925.920
M33X39.72415.16720.60726.05031.493
Metric Fine
M8X10.1830.2900.3960.5020.609
M10X10.2990.4660.6340.7960.966
M10X1.250.3560.5650.7740.9811.190
M12X1.250.5280.8271.1261.4281.727
M12X1.50.6180.9771.3381.6982.057
M14X1.50.8601.3511.8392.3302.820
M16X1.51.1421.7822.4223.0623.700
M18X1.51.4632.2733.0823.8924.701
M20X1.51.8262.8253.8264.8255.823
M22X1.52.2293.4394.6495.8567.066
M18X21.8832.9634.0445.1226.202
M20X22.3583.6925.0256.3587.689
M22X22.8894.5016.1147.7269.339
M24X23.4675.3867.3069.22511.143
M27X24.4376.8669.29511.72414.153
M30X25.5298.52711.52414.52217.521
M33X26.73910.36613.99417.62221.250
M36X28.07612.39316.70921.02525.342
M39X29.52814.59519.65924.72629.792
M36X311.69518.17224.64931.12337.600
M39X313.83821.43929.04036.63944.240
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