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    High-Quality Threading Inserts from China Suppliers and Factory - 60°, 55°, ISO, UN, and Whitworth Grades
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    High-Quality Threading Inserts from China Suppliers and Factory - 60°, 55°, ISO, UN, and Whitworth Grades

    • High-Quality Threading Inserts - 60° Threading Inserts Manufactured in China
    • Durable Threading Inserts - 55° Threading Inserts from Reliable Suppliers
    • Precision ISO Threading Inserts - Trusted Products from Leading Factories
    • UN-60° American UN Threading Inserts - Premium Quality from Chinese Suppliers
    • W-55° Whitworth Threading Inserts - Superior Options from Established Factories in China

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      Product Detail

      Insert Grades — 60° Threading Insert (External)
      Threading Insert 60° External - Grade Chart Work Piece P Steel ★ ★ ★
      M Stainless Steel ★ ★
      K Cast Iron ★ ☆
      N Non-ferrous Metals ★
      S Heat-resistant Alloys ★
      H High-hardness Materials ★
      Shape Specification Dia TPI Size Insert Grade
      Right Hand Left Hand mm TPI L X Y T QP1120 QP5120 QP7105 QA20
      Threading Insert 60° External Shape 11ERA60 11ELA60 1/4″ 0.5-1.5 48-16 11 0.8 0.9 13.2 ● ● ● ●
      16ERA60 16ELA60 3/8″ 0.5-1.5 48-16 16 0.8 0.9 3.65 ○ ○ ○ ○
      16ERAG60 16ELAG60 3/8″ 0.5-3.0 Aug-48 16 1.2 1.7 3.65 ● ● ● ●
      16ERG60 16ELG60 3/8″ 1.75-3.0 8-14 16 1.2 1.7 3.65 ○ ○ ○ ○
      22ERN60 22ELN60 1/2″ 3.5-5.0 7-5 22 1.7 2.5 4.76 ● ● ● ●
      27ERQ60 27ELQ60 5/8″ 5.5-6.0 4.5-4 27 2.1 3.1 6.35 ○ ○ ○ ○
      Notice: Inserts for left hand only produced according to order.
      Insert Grades — 60° Threading Insert (Internal)
      Threading Insert 60° Internal - Grade Chart Work Piece P Steel ★ ★ ★
      M Stainless Steel ★ ★
      K Cast Iron ★ ☆
      N Non-ferrous Metals ★
      S Heat-resistant Alloys ★
      H High-hardness Materials ★
      Shape Specification Dia TPI Size Insert Grade
      Right Hand Left Hand mm TPI L X Y T QP1120 QP5120 QP7105 QA20
      Threading Insert 60° Internal Shape 06IRA60 06ILA60 5/32″ 0.5-1.25 48-20 6 0.6 0.6 1.9 ○ ○ ○ ○
      08IRA60 08ILA60 3/16″ 0.5-1.5 48-16 8 0.6 0.7 2.2 ○ ○ ○ ○
      11IRA60 11ILA60 1/4″ 0.5-1.5 48-16 11 0.8 0.9 3.2 ● ● ● ●
      16IRA60 16ILA60 3/8″ 0.5-1.5 48-16 16 0.8 0.9 3.65 ○ ○ ○ ○
      16IRAG60 16ILAG60 3/8″ 0.5-3.0 Aug-48 16 1.2 1.7 3.65 ● ● ● ●
      16IRG60 16ILG60 3/8″ 1.75-3.0 8-14 16 1.2 1.7 3.65 ○ ○ ○ ○
      22IRN60 22ILN60 1/2″ 3.5-5.0 7-5 22 1.7 2.5 4.76 ● ● ● ●
      27IRQ60 27ILQ60 5/8″ 5.5-6.0 4.5-4 27 2.1 3.1 6.35 ○ ○ ○ ○
      Notice: Inserts for left hand only produced according to order.
      Notice:   ● Continuous   ○ Continuous   ★ Medium   ☆ Medium   ▩ Interrupted   ▨ Interrupted
      ▲ Excellent (Instock)   ● Good (Instock)   ○ On Request
      Insert Grades — 55° Threading Insert (External)
      Threading Insert 55° External - Grade Chart Work Piece P Steel ★ ★ ★
      M Stainless Steel ★ ★
      K Cast Iron ★ ☆
      N Non-ferrous Metals ★
      S Heat-resistant Alloys ★
      H High-hardness Materials ★
      Shape Specification Dia TPI Size Insert Grade
      Right Hand Left Hand mm TPI L X Y T QP1120 QP5120 QP7105 QA20
      11ERA55 11ELA55 1/4″ 0.5-1.5 48-16 11 0.8 0.9 3.2 ○ ○ ○ ○
      16ERA55 16ELA55 3/8″ 0.5-1.5 48-16 16 0.8 0.9 3.65 ○ ○ ○ ○
      16ERAG55 16ELAG55 3/8″ 0.5-3.0 Aug-48 16 1.2 1.7 3.65 ○ ○ ○ ○
      16ERG55 16ELG55 3/8″ 1.75-3.0 8-14 16 1.2 1.7 3.65 ○ ○ ○ ○
      22ERN55 22ELN55 1/2″ 3.5-5.0 7-5 22 1.7 2.5 4.76 ○ ○ ○ ○
      27ERQ55 27ELQ55 5/8″ 5.5-6.0 4.5-4 27 2 2.9 6.35 ○ ○ ○ ○
      Notice: Inserts for left hand only produced according to order.
      Insert Grades — 55° Threading Insert (Internal)
      Threading Insert 55° Internal - Grade Chart Work Piece P Steel ★ ★ ★
      M Stainless Steel ★ ★
      K Cast Iron ★ ☆
      N Non-ferrous Metals ★
      S Heat-resistant Alloys ★
      H High-hardness Materials ★
      Shape Specification Dia TPI Size Insert Grade
      Right Hand Left Hand mm TPI L X Y T QP1120 QP5120 QP7105 QA20
      Threading Insert 55° Internal Shape 06IRA55 06ILA55 5/32″ 0.5-1.25 48-20 6 0.6 0.6 1.9 ○ ○ ○ ○
      08IRA55 08ILA55 3/16″ 0.5-1.5 48-16 8 0.6 0.7 2.2 ○ ○ ○ ○
      11IRA55 11ILA55 1/4″ 0.5-1.5 48-16 11 0.8 0.9 3.2 ○ ○ ○ ○
      16IRA55 16ILA55 3/8″ 0.5-1.5 48-16 16 0.8 0.9 3.65 ○ ○ ○ ○
      16IRAG55 16ILAG55 3/8″ 0.5-3.0 Aug-48 16 1.2 1.7 3.65 ○ ○ ○ ○
      16IRG55 16ILG55 3/8″ 1.75-3.0 8-14 16 1.2 1.7 3.65 ○ ○ ○ ○
      22IRN55 22ILN55 1/2″ 3.5-5.0 7-5 22 1.7 2.5 4.76 ○ ○ ○ ○
      27IRQ55 27ILQ55 5/8″ 5.5-6.0 4.5-4 27 1.8 2.7 6.35 ○ ○ ○ ○
      Notice: Inserts for left hand only produced according to order.
      Notice:   ● Continuous   ○ Continuous   ★ Medium   ☆ Medium   ▩ Interrupted   ▨ Interrupted
      ▲ Excellent (Instock)   ● Good (Instock)   ○ On Request
      Insert Grades — ISO Threading Insert (External)
      ISO Threading Insert External - Grade Chart Work Piece P Steel ★ ★ ★
      M Stainless Steel ★ ★
      K Cast Iron ★ ☆
      N Non-ferrous Metals ★
      S Heat-resistant Alloys ★
      H High-hardness Materials ★
      Shape Specification Dia TPI Size Insert Grade
      Right Hand Left Hand mm TPI L X Y T QP1120 QP5120 QP7105 QA20
      ISO Threading Insert External Shape 11ER0.50ISO 11EL0.50ISO 1/4″ 0.5 - 11 0.6 0.6 3.2 ● ● ● ●
      11ER0.75ISO 11EL0.75ISO 1/4″ 0.75 - 11 0.6 0.6 3.2 ● ● ● ●
      11ER1.00ISO 11EL1.00ISO 1/4″ 1 - 11 0.7 0.7 3.2 ● ● ● ●
      11ER1.25ISO 11EL1.25ISO 1/4″ 1.25 - 11 0.8 0.9 3.2 ● ● ● ●
      11ER1.50ISO 11EL1.50ISO 1/4″ 1.5 - 11 0.8 1 3.2 ● ● ● ●
      11ER1.75ISO 11EL1.75ISO 1/4″ 1.75 - 11 0.8 1.1 3.2 ● ● ● ●
      16ER0.50ISO 16EL0.50ISO 3/8″ 0.5 - 16 0.6 0.6 3.65 ● ● ● ●
      16ER0.75ISO 16EL0.75ISO 3/8″ 0.75 - 16 0.6 0.6 3.65 ● ● ● ●
      16ER1.00ISO 16EL1.00ISO 3/8″ 1 - 16 0.7 0.7 3.65 ● ● ● ●
      16ER1.25ISO 16EL1.25ISO 3/8″ 1.25 - 16 0.8 0.9 3.65 ● ● ● ●
      16ER1.50ISO 16EL1.50ISO 3/8″ 1.5 - 16 0.8 1 3.65 ● ● ● ●
      16ER1.75ISO 16EL1.75ISO 3/8″ 1.75 - 16 0.9 1.2 3.65 ● ● ● ●
      16ER2.00ISO 16EL2.00ISO 3/8″ 2 - 16 1 1.3 3.65 ● ● ● ●
      16ER2.50ISO 16EL2.50ISO 3/8″ 2.5 - 16 1.1 1.5 3.65 ● ● ● ●
      16ER3.00ISO 16EL3.00ISO 3/8″ 3 - 16 1.2 1.6 3.65 ● ● ● ●
      22ER3.50ISO 22EL3.50ISO 1/2″ 3.5 - 22 1.6 2.3 4.76 ● ● ● ●
      22ER4.00ISO 22EL4.00ISO 1/2″ 4 - 22 1.6 2.3 4.76 ● ● ● ●
      22ER4.50ISO 22EL4.50ISO 1/2″ 4.5 - 22 1.7 2.4 4.76 ● ● ● ●
      22ER5.00ISO 22EL5.00ISO 1/2″ 5 - 22 1.7 2.5 4.76 ● ● ● ●
      27ER5.50ISO 27EL5.50ISO 5/8″ 5.5 - 27.5 1.9 2.7 6.35 ○ ○ ○ ○
      27ER6.00ISO 27EL6.00ISO 5/8″ 6 - 27.5 2 2.9 6.35 ○ ○ ○ ○
      Notice: Inserts for left hand only produced according to order.
      Notice:   ● Continuous   ○ Continuous   ★ Medium   ☆ Medium   ▩ Interrupted   ▨ Interrupted
      ▲ Excellent (Instock)   ● Good (Instock)   ○ On Request
      Insert Grades — ISO Threading Insert (Internal)
      ISO Threading Insert Internal - Grade Chart Work Piece P Steel ★ ★ ★
      M Stainless Steel ★ ★
      K Cast Iron ★ ☆
      N Non-ferrous Metals ★
      S Heat-resistant Alloys ★
      H High-hardness Materials ★
      Shape Specification Dia TPI Size Insert Grade
      Right Hand Left Hand mm TPI L X Y T QP1120 QP5120 QP7105 QA20
      ISO Threading Insert Internal Shape 06IR0.50ISO 06IL0.50ISO 5/32″ 0.5 - 6 0.9 0.5 1.9 ○ ○ ○ ○
      06IR0.75ISO 06IL0.75ISO 5/32″ 0.75 - 6 0.8 0.5 1.9 ○ ○ ○ ○
      06IR1.00ISO 06IL1.00ISO 5/32″ 1 - 6 0.7 0.6 1.9 ○ ○ ○ ○
      06IR1.25ISO 06IL1.25ISO 5/32″ 1.25 - 6 0.6 0.6 1.9 ○ ○ ○ ○
      08IR0.50ISO 08IL0.50ISO 3/16″ 0.5 - 8 0.6 0.5 2.2 ○ ○ ○ ○
      08IR0.75ISO 08IL0.75ISO 3/16″ 0.75 - 8 0.6 0.5 2.2 ○ ○ ○ ○
      08IR1.00ISO 08IL1.00ISO 3/16″ 1 - 8 0.6 0.6 2.2 ○ ○ ○ ○
      08IR1.25ISO 08IL1.25ISO 3/16″ 1.25 - 8 0.6 0.7 2.2 ○ ○ ○ ○
      08IR1.50ISO 08IL1.50ISO 3/16″ 1.5 - 8 0.6 0.7 2.2 ○ ○ ○ ○
      08IR1.75ISO 08IL1.75ISO 3/16″ 1.75 - 8 0.6 0.8 2.2 ○ ○ ○ ○
      11IR0.50ISO 11IL0.50ISO 1/4″ 0.5 - 11 0.6 0.6 3.2 ● ● ● ●
      11IR0.75ISO 11IL0.75ISO 1/4″ 0.75 - 11 0.6 0.6 3.2 ● ● ● ●
      11IR1.00ISO 11IL1.00ISO 1/4″ 1 - 11 0.6 0.7 3.2 ● ● ● ●
      11IR1.25ISO 11IL1.25ISO 1/4″ 1.25 - 11 0.8 0.9 3.2 ● ● ● ●
      11IR1.50ISO 11IL1.50ISO 1/4″ 1.5 - 11 0.8 1 3.2 ● ● ● ●
      11IR1.75ISO 11IL1.75ISO 1/4″ 1.75 - 11 0.9 1.1 3.2 ● ● ● ●
      11IR2.00ISO 11IL2.00ISO 1/4″ 2 - 11 1 1.3 3.2 ● ● ● ●
      16IR0.50ISO 16IL0.50ISO 3/8″ 0.5 - 16 0.6 0.6 3.65 ● ● ● ●
      16IR0.75ISO 16IL0.75ISO 3/8″ 0.75 - 16 0.6 0.6 3.65 ● ● ● ●
      16IR1.00ISO 16IL1.00ISO 3/8″ 1 - 16 0.6 0.7 3.65 ● ● ● ●
      16IR1.25ISO 16IL1.25ISO 3/8″ 1.25 - 16 0.8 0.9 3.65 ● ● ● ●
      16IR1.50ISO 16IL1.50ISO 3/8″ 1.5 - 16 0.8 1 3.65 ● ● ● ●
      16IR1.75ISO 16IL1.75ISO 3/8″ 1.75 - 16 0.9 1.2 3.65 ● ● ● ●
      16IR2.00ISO 16IL2.00ISO 3/8″ 2 - 16 1 1.3 3.65 ● ● ● ●
      16IR2.50ISO 16IL2.50ISO 3/8″ 2.5 - 16 1.1 1.5 3.65 ● ● ● ●
      16IR3.00ISO 16IL3.00ISO 3/8″ 3 - 16 1.1 1.5 3.65 ● ● ● ●
      22IR3.50ISO 22IL3.50ISO 1/2″ 3.5 - 22 1.6 2.3 4.76 ● ● ● ●
      22IR4.00ISO 22IL4.00ISO 1/2″ 4 - 22 1.6 2.3 4.76 ● ● ● ●
      22IR4.50ISO 22IL4.50ISO 1/2″ 4.5 - 22 1.7 2.4 4.76 ● ● ● ●
      22IR5.00ISO 22IL5.00ISO 1/2″ 5 - 22 1.7 2.5 4.76 ● ● ● ●
      27IR5.50ISO 27IL5.50ISO 5/8″ 5.5 - 27.5 1.9 2.7 6.35 ○ ○ ○ ○
      27IR6.00ISO 27IL6.00ISO 5/8″ 6 - 27.5 2 2.9 6.35 ○ ○ ○ ○
      Notice: Inserts for left hand only produced according to order.
      Notice:   ● Continuous   ○ Continuous   ★ Medium   ☆ Medium   ▩ Interrupted   ▨ Interrupted
      ▲ Excellent (Instock)   ● Good (Instock)   ○ On Request
      Insert Grades — UN-60° America UN Threading Insert (External)
      UN-60° America UN Threading Insert External
      UN-60° External Grade Chart Work Piece P Steel ★ ★ ★
      M Stainless Steel ★ ★
      K Cast Iron ★ ☆
      N Non-ferrous Metals ★
      S Heat-resistant Alloys ★
      H High-hardness Materials ★
      Shape Specification Dia TPI Size Insert Grade
      Right Hand Left Hand mm TPI L X Y T QP1120 QP5120 QP7105 QA20
      UN-60° External Shape 16ER28UN 16EL28UN 3/8″ 28 - 16 0.6 0.7 3.65 ● ● ● ○
      16ER24UN 16EL24UN 3/8″ 24 - 16 0.7 0.8 3.65 ● ● ● ○
      16ER20UN 16EL20UN 3/8″ 20 - 16 0.8 0.9 3.65 ● ● ● ○
      16ER18UN 16EL18UN 3/8″ 18 - 16 0.8 1 3.65 ● ● ● ○
      16ER16UN 16EL16UN 3/8″ 16 - 16 0.9 1.1 3.65 ● ● ● ○
      16ER14UN 16EL14UN 3/8″ 14 - 16 1 1.2 3.65 ● ● ● ○
      16ER13UN 16EL13UN 3/8″ 13 - 16 1.1 1.3 3.65 ○ ○ ○ ○
      16ER12UN 16EL12UN 3/8″ 12 - 16 1.1 1.4 3.65 ● ● ● ○
      16ER11UN 16EL11UN 3/8″ 11 - 16 1.1 1.5 3.65 ● ● ● ○
      16ER10UN 16EL10UN 3/8″ 10 - 16 1.1 1.5 3.65 ● ● ● ○
      16ER9UN 16EL9UN 3/8″ 9 - 16 1.2 1.7 3.65 ● ● ● ○
      16ER8UN 16EL8UN 3/8″ 8 - 16 1.2 2 3.65 ● ● ● ○
      22ER7UN 22EL7UN 1/2″ 7 - 22 1.6 2.3 4.76 ○ ○ ○ ○
      22ER6UN 22EL6UN 1/2″ 6 - 22 1.6 2.3 4.76 ○ ○ ○ ○
      22ER5UN 22EL5UN 1/2″ 5 - 22 1.7 2.5 4.76 ○ ○ ○ ○
      Notice: Inserts for left hand only produced according to order.
      Notice:   ● Continuous   ○ Continuous   ★ Medium   ☆ Medium   ▩ Interrupted   ▨ Interrupted
      ▲ Excellent (Instock)   ● Good (Instock)   ○ On Request
      Insert Grades — UN-60° America UN Threading Insert (Internal)
      UN-60° America UN Threading Insert Internal
      UN-60° Internal Grade Chart Work Piece P Steel ★ ★ ★
      M Stainless Steel ★ ★
      K Cast Iron ★ ☆
      N Non-ferrous Metals ★
      S Heat-resistant Alloys ★
      H High-hardness Materials ★
      Shape Specification Dia TPI Size Insert Grade
      Right Hand Left Hand mm TPI L X Y T QP1120 QP5120 QP7105 QA20
      UN-60° Internal Shape 06IR32UN 06IL32UN 5/32″ 32 - 6 0.8 0.5 1.9 ○ ○ ○ ○
      06IR28UN 06IL28UN 5/32″ 28 - 6 0.8 0.6 1.9 ○ ○ ○ ○
      06IR24UN 06IL24UN 5/32″ 24 - 6 0.7 0.6 1.9 ○ ○ ○ ○
      06IR20UN 06IL20UN 5/32″ 20 - 6 0.6 0.6 1.9 ○ ○ ○ ○
      06IR18UN 06IL18UN 5/32″ 18 - 6 0.6 0.7 1.9 ○ ○ ○ ○
      08IR32UN 08IL32UN 3/16″ 32 - 8 0.6 0.5 2.2 ○ ○ ○ ○
      08IR28UN 08IL28UN 3/16″ 28 - 8 0.6 0.6 2.2 ○ ○ ○ ○
      08IR24UN 08IL24UN 3/16″ 24 - 8 0.6 0.6 2.2 ○ ○ ○ ○
      08IR20UN 08IL20UN 3/16″ 20 - 8 0.6 0.7 2.2 ○ ○ ○ ○
      08IR18UN 08IL18UN 3/16″ 18 - 8 0.6 0.7 2.2 ○ ○ ○ ○
      08IR16UN 08IL16UN 3/16″ 16 - 8 0.6 0.7 2.2 ○ ○ ○ ○
      08IR14UN 08IL14UN 3/16″ 14 - 8 0.6 0.8 2.2 ○ ○ ○ ○
      11IR32UN 11IL32UN 1/4″ 32 - 11 0.6 0.6 3.2 ○ ○ ○ ○
      11IR28UN 11IL28UN 1/4″ 28 - 11 0.6 0.7 3.2 ○ ○ ○ ○
      11IR24UN 11IL24UN 1/4″ 24 - 11 0.7 0.8 3.2 ○ ○ ○ ○
      11IR20UN 11IL20UN 1/4″ 20 - 11 0.8 0.9 3.2 ○ ○ ○ ○
      11IR18UN 11IL18UN 1/4″ 18 - 11 0.8 1 3.2 ○ ○ ○ ○
      11IR16UM 11IL16UM 1/4″ 16 - 11 0.9 1.1 3.2 ● ● ● ○
      16IR32UN 16IL32UN 3/8″ 32 - 16 0.6 0.6 3.65 ● ● ● ○
      16IR28UN 16IL28UN 3/8″ 28 - 16 0.6 0.7 3.65 ○ ● ● ○
      16IR24UN 16IL24UN 3/8″ 24 - 16 0.7 0.8 3.65 ● ● ● ○
      16IR20UN 16IL20UN 3/8″ 20 - 16 0.8 0.9 3.65 ● ● ● ○
      16IR18UN 16IL18UN 3/8″ 18 - 16 0.8 1 3.65 ● ● ● ○
      16IR16UN 16IL16UN 3/8″ 16 - 16 0.9 1.1 3.65 ● ● ● ○
      16IR14UN 16IL14UN 3/8″ 14 - 16 1 1.2 3.65 ● ● ● ○
      16IR13UN 16IL13UN 3/8″ 13 - 16 1.1 1.3 3.65 ○ ○ ● ○
      16IR12UN 16IL12UN 3/8″ 12 - 16 1.1 1.4 3.65 ● ● ● ○
      16IR11UN 16IL11UN 3/8″ 11 - 16 1.1 1.5 3.65 ● ● ● ○
      16IR10UN 16IL10UN 3/8″ 10 - 16 1.1 1.5 3.65 ● ● ● ○
      16IR9UN 16IL9UN 3/8″ 9 - 16 1.2 1.7 3.65 ● ● ● ○
      16IR8UN 16IL8UN 1/2″ 8 - 16 1.2 2 3.65 ● ● ● ○
      22IR7UN 22IL7UN 1/2″ 7 - 22 1.6 2.3 4.76 ○ ● ● ○
      22IR6UN 22IL6UN 1/2″ 6 - 22 1.6 2.3 4.76 ○ ● ● ○
      22IR5UN 22IL5UN 1/2″ 5 - 22 1.7 2.5 4.76 ○ ○ ● ○
      Notice: Inserts for left hand only produced according to order.
      Notice:   ● Continuous   ○ Continuous   ★ Medium   ☆ Medium   ▩ Interrupted   ▨ Interrupted
      ▲ Excellent (Instock)   ● Good (Instock)   ○ On Request
      Insert Grades — W-55° Whitworth Threading Insert (External)
      Whitworth 55° External - Grade Chart Work Piece P Steel ★ ★ ★
      M Stainless Steel ★ ★
      K Cast Iron ★ ☆
      N Non-ferrous Metals ★
      S Heat-resistant Alloys ★
      H High-hardness Materials ★
      Shape Specification Dia TPI Size Insert Grade
      Right Hand Left Hand mm TPI L X Y T QP1120 QP5120 QP7105 QA20
      Whitworth 55° External Shape 11ER28W 11EL28W 1/4″ 28 11 0.6 0.7 3.2 ○ ○ ○ ○
      11ER26W 11EL26W 1/4″ 26 - 11 0.7 0.8 3.2 ○ ○ ○ ○
      11ER20W 11EL20W 1/4″ 20 - 11 0.8 0.9 3.2 ○ ○ ○ ○
      11ER19W 11EL19W 1/4″ 19 - 11 0.8 1 3.2 ○ ○ ○ ○
      11ER18W 11EL18W 1/4″ 18 - 11 0.8 1 3.2 ○ ○ ○ ○
      11ER16W 11EL16W 1/4″ 16 - 11 0.9 1.1 3.2 ○ ○ ○ ○
      11ER14W 11EL14W 1/4″ 14 - 11 1 1.2 3.2 ○ ○ ○ ○
      16ER28W 16EL28W 3/8″ 28 - 16 0.6 0.7 3.65 ● ○ ● ●
      16ER26W 16EL26W 3/8″ 26 - 16 0.7 0.8 3.65 ○ ○ ○ ○
      16ER20W 16EL20W 3/8″ 20 - 16 0.8 0.9 3.65 ○ ○ ○ ○
      16ER19W 16EL19W 3/8″ 19 - 16 0.8 1 3.65 ● ● ● ●
      16ER18W 16EL18W 3/8″ 18 - 16 0.8 0.9 3.65 ○ ○ ○ ○
      16ER16W 16EL16W 3/8″ 16 - 16 0.9 1.1 3.65 ○ ○ ○ ○
      16ER14W 16EL14W 3/8″ 14 - 16 1 1.2 3.65 ● ● ● ●
      16ER12W 16EL12W 3/8″ 12 - 16 1.1 1.4 3.65 ○ ● ● ●
      16ER11W 16EL11W 3/8″ 11 - 16 1.1 1.5 3.65 ● ● ● ●
      16ER10W 16EL10W 3/8″ 10 - 16 1.1 1.5 3.65 ○ ○ ○ ○
      16ER9W 16EL9W 3/8″ 9 - 16 1.2 1.5 3.65 ○ ○ ○ ○
      16ER8W 16EL8W 3/8″ 8 - 16 1.2 1.7 3.65 ○ ○ ○ ○
      22ER7W 22EL7W 1/2″ 7 - 22 1.6 2.3 4.76 ○ ○ ○ ○
      22ER6W 22EL6W 1/2″ 6 - 22 1.6 2.3 4.76 ○ ○ ○ ○
      22ER5W 22EL5W 1/2″ 5 - 22 1.7 2.4 4.76 ○ ○ ○ ○
      27ER4.5W 27EL4.5W 5/8″ 4.5 - 27 1.8 2.6 6.35 ○ ○ ○ ○
      27ER4W 27EL4W 5/8″ 4 - 27 2 2.9 6.35 ○ ○ ○ ○
      Notice: Inserts for left hand only produced according to order.
      Notice:   ● Continuous   ○ Continuous   ★ Medium   ☆ Medium   ▩ Interrupted   ▨ Interrupted
      ▲ Excellent (Instock)   ● Good (Instock)   ○ On Request
      Insert Grades — W-55° Whitworth Threading Insert (Internal)
      Whitworth 55° Internal - Grade Chart Work Piece P Steel ★ ★ ★
      M Stainless Steel ★ ★
      K Cast Iron ★ ☆
      N Non-ferrous Metals ★
      S Heat-resistant Alloys ★
      H High-hardness Materials ★
      Shape Specification Dia TPI Size Insert Grade
      Right Hand Left Hand mm TPI L X Y T QP1120 QP5120 QP7105 QA20
      Whitworth 55° Internal Shape 06IR26W 06IL26W 5/32″ 26 - 6 0.7 0.6 1.9 ○ ○ ○ ○
      06IR22W 06IL22W 5/32″ 22 - 6 0.6 0.6 1.9 ○ ○ ○ ○
      06IR20W 06IL20W 5/32″ 20 - 6 0.6 0.7 1.9 ○ ○ ○ ○
      06IR18W 06IL18W 5/32″ 18 - 6 0.6 0.7 1.9 ○ ○ ○ ○
      08IR28W 08IL28W 3/16″ 28 - 8 0.6 0.6 2.2 ○ ○ ○ ○
      08IR24W 08IL24W 3/16″ 24 - 8 0.6 0.6 2.2 ○ ○ ○ ○
      08IR20W 08IL20W 3/16″ 20 - 8 0.6 0.7 2.2 ○ ○ ○ ○
      08IR19W 08IL19W 3/16″ 19 - 8 0.6 0.7 2.2 ○ ○ ○ ○
      08IR18W 08IL18W 3/16″ 18 - 8 0.6 0.7 2.2 ○ ○ ○ ○
      08IR16W 08IL16W 3/16″ 16 - 8 0.6 0.7 2.2 ○ ○ ○ ○
      11IR28W 11IL28W 1/4″ 28 - 11 0.6 0.6 3.2 ○ ○ ○ ○
      11IR26W 11IL26W 1/4″ 26 - 11 0.6 0.7 3.2 ○ ○ ○ ○
      11IR20W 11IL20W 1/4″ 20 - 11 0.7 0.9 3.2 ○ ○ ○ ○
      11IR19W 11IL19W 1/4″ 19 - 11 0.8 1 3.2 ● ● ● ●
      11IR18W 11IL18W 1/4″ 18 - 11 0.8 1 3.2 ○ ○ ○ ○
      11IR16W 11IL16W 1/4″ 16 - 11 0.9 1.1 3.2 ○ ○ ○ ○
      11IR14W 11IL14W 1/4″ 14 - 11 1 1.2 3.2 ● ● ● ●
      16IR28W 16IL28W 3/8″ 28 - 16 0.6 0.7 3.65 ● ○ ● ●
      16IR26W 16IL26W 3/8″ 26 - 16 0.7 0.8 3.65 ○ ○ ○ ○
      16IR20W 16IL20W 3/8″ 20 - 16 0.8 0.9 3.65 ○ ○ ○ ○
      16IR19W 16IL19W 3/8″ 19 - 16 0.8 1 3.65 ● ● ● ●
      16IR18W 16IL18W 3/8″ 18 - 16 0.8 1 3.65 ○ ○ ○ ○
      16IR16W 16IL16W 3/8″ 16 - 16 0.9 1.1 3.65 ○ ○ ○ ○
      16IR14W 16IL14W 3/8″ 14 - 16 1 1.2 3.65 ● ● ● ●
      16IR12W 16IL12W 3/8″ 12 - 16 1.1 1.4 3.65 ● ● ● ●
      16IR11W 16IL11W 3/8″ 11 - 16 1.1 1.5 3.65 ● ● ● ●
      16IR10W 16IL10W 3/8″ 10 - 16 1.1 1.5 3.65 ○ ○ ○ ○
      16IR9W 16IL9W 3/8″ 9 - 16 1.2 1.5 3.65 ○ ○ ○ ○
      16IR8W 16IL8W 3/8″ 8 - 16 1.2 1.7 3.65 ○ ○ ○ ○
      22IR7W 22IL7W 1/2″ 7 - 22 1.6 2.3 4.76 ○ ○ ○ ○
      22IR6W 22IL6W 1/2″ 6 - 22 1.6 2.3 4.76 ○ ○ ○ ○
      22IR5W 22IL5W 1/2″ 5 - 22 1.7 2.4 4.76 ○ ○ ○ ○
      27IR4.5W 27IL4.5W 5/8″ 4.5 - 27 1.8 2.6 6.35 ○ ○ ○ ○
      27IR4W 27IL4W 5/8″ 4 - 27 2 2.9 6.35 ○ ○ ○ ○
      Notice: Inserts for left hand only produced according to order.
      Notice:   ● Continuous   ○ Continuous   ★ Medium   ☆ Medium   ▩ Interrupted   ▨ Interrupted
      ▲ Excellent (Instock)   ● Good (Instock)   ○ On Request
      Insert Grades — TR-30° Trapezoid Threading Insert
      TR-30° Trapezoid Threading Insert
      TR-30° Trapezoid Grade Chart Work Piece P Steel ★ ★ ★
      M Stainless Steel ★ ★
      K Cast Iron ★ ☆
      N Non-ferrous Metals ★
      S Heat-resistant Alloys ★
      H High-hardness Materials ★
      Shape Specification Dia TPI Size Insert Grade
      Right Hand Left Hand mm TPI L X Y T QP1120 QP5120 QP7105 QA20
      TR-30° External Shape 16ER1.50TR 16EL1.50TR 3/8″ 1.5 - 16 1 1.1 3.65 ● ● ● ○
      16ER2.00TR 16EL2.00TR 3/8″ 2 - 16 1.1 1.3 3.65 ● ● ● ○
      16ER3.00TR 16EL3.00TR 3/8″ 3 - 16 1.3 1.5 3.65 ● ● ● ○
      22ER4.00TR 22EL4.00TR 1/2″ 4 - 22 1.7 1.9 4.76 ● ● ● ○
      22ER5.00TR 22EL5.00TR 1/2″ 5 - 22 2.1 2.5 4.76 ● ● ● ○
      27ER6.00TR 27EL6.00TR 5/8″ 6 - 27 2.2 2.6 6.35 ○ ○ ○ ○
      27ER7.00TR 27EL7.00TR 5/8″ 7 - 27 2.3 2.7 6.35 ○ ○ ○ ○
      TR-30° Internal Shape 16IR1.50TR 16IL1.50TR 3/8″ 1.5 - 16 1 1.1 3.65 ● ● ● ○
      16IR2.00TR 16IL2.00TR 3/8″ 2 - 16 1.1 1.3 3.65 ● ● ● ○
      16IR3.00TR 16IL3.00TR 3/8″ 3 - 16 1.3 1.5 3.65 ● ● ● ○
      22IR4.00TR 22IL4.00TR 1/2″ 4 - 22 1.7 1.9 4.76 ● ● ● ○
      22IR5.00TR 22IL5.00TR 1/2″ 5 - 22 2.1 2.5 4.76 ● ● ● ○
      27IR6.00TR 27IL6.00TR 5/8″ 6 - 27 2.2 2.6 6.35 ○ ○ ○ ○
      27IR7.00TR 27IL7.00TR 5/8″ 7 - 27 2.3 2.7 6.35 ○ ○ ○ ○
      Notice: Inserts for left hand only produced according to order.
      Notice:   ● Continuous   ○ Continuous   ★ Medium   ☆ Medium   ▩ Interrupted   ▨ Interrupted
      ▲ Excellent (Instock)   ● Good (Instock)   ○ On Request
      Frequently Asked Questions
      Q1: What is the difference between 60° and 55° threading inserts?
      60° threading inserts are used for metric ISO and UN/UNC/UNF American standard threads, while 55° threading inserts are designed for British Standard Whitworth (BSW) and BSP threads. Choosing the correct thread angle is critical to achieving accurate thread profiles and proper fit.
      Q2: What do the insert grade codes QP1120, QP5120, QP7105, and QA20 represent?
      These codes represent different carbide insert grades with varying substrate compositions and coatings. QP1120 and QP5120 are suitable for steel and stainless steel machining, QP7105 offers excellent performance on heat-resistant alloys and hard materials, while QA20 is optimized for non-ferrous metals such as aluminum and copper alloys.
      Q3: Can left-hand threading inserts be ordered for all specifications listed?
      Left-hand threading inserts are available but are produced according to customer order only. They are not stocked as standard items. Please contact us with your specific left-hand insert requirements, including the specification code and quantity needed, and we will arrange production accordingly.
      Q4: What does the availability legend ●, ○, and ▲ mean in the grade tables?
      The availability symbols indicate stock status: ▲ (Excellent – In Stock) means the item is readily available with large inventory; ● (Good – In Stock) means the item is available from regular stock; ○ (On Request) means the item needs to be ordered and is not held in standard inventory. Please inquire for lead times on On Request items.
      Q5: What is the TR-30° Trapezoid threading insert used for?
      TR-30° Trapezoid threading inserts are specifically designed for machining trapezoidal threads (metric trapezoidal thread standard, e.g., Tr threads per DIN 103). These threads are commonly used in lead screws, power transmission screws, and machine tool applications where high axial load capacity and precise positioning are required.
      Q6: How do I select the correct threading insert size (e.g., 11E, 16E, 22E, 27E)?
      The size prefix number refers to the inscribed circle diameter of the insert in millimeters (e.g., 11 = 11mm IC, 16 = 16mm IC). Selection is based on the thread pitch and the toolholder size being used. Larger inserts (22, 27) accommodate coarser pitches and larger thread diameters, while smaller inserts (06, 08, 11) are suited for fine pitches and smaller bore applications.

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