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Home>Rotary Tooling>R8 Tooling & Accessories

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R8 End Mill Holders Tooling Adapters, Collets
R8 End MIll Holder R8 Collets & Chuck R8 Adapters
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R8 End Mill Holders Tooling Adapters, Collets

Part Number R8TH-
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R8 End Mill Holders Collet Chucks Tooling Adapters & Collets
Feature: condition: new
Feature 6

This taper was designed by Bridgeport Machines, Inc. of the USA for use in their milling machines. It is intended that collets be inserted directly into the machine taper, which is not usual with other tapers (except very occasionally with Morse). Collets must be used with a drawbar extending up through the spindle to the top of the machine to prevent the collet from falling from the spindle when lateral forces are encountered. The collet has a precision hole in one end for holding a cutting tool and is threaded for a drawbar on other end. They are also keyed (see image) to prevent rotation during insertion and removal. However, cutting torques are transferred through friction at the taper, not through the key. The drawbar thread is typically 7/16"-20 tpi (UNF).

The R8 system can accept tools with a nominal 3/4" shank diameter. Smaller tools are generally held using a toolholder with a 3/4" shank diameter. The cutting tool or toolholder is placed in the collet, the collet placed into the taper, and the drawbar is tightened into the top of the collet from above the spindle. The collet has a groove to engage a key in the spindle to keep the collet from spinning inside the taper and to aid in the installation and removal of the collet. The angle of the cone is typically 16 degrees and 51 minutes (i.e. 16.85 degrees) with an OD of 1.25" (source, Bridgeport Manufacturer).

The R8 taper is commonly encountered on Bridgeport and similar turret mills from the USA, or on (very common) copies of these mills from elsewhere.[citation needed] The popularity is due in large part to the success of Bridgeport and other mills that were closely modeled after it and produced throughout much of the 20th century.
Feature 10
3-169-005 R8 Spring Collet 1/16in Round
3-169-010 R8 Spring Collet, 3/32in Round,
3-169-012 R8 Spring Collet, 1/8in Round,
3-169-015 R8 Spring Collet, 5/32 Round,
3-169-018 R8 Spring Collet, 3/16 Round,
3-169-021 R8 Spring Collet, 7/32 Round,
3-169-025 R8 Spring Collet, 1/4in Round,
3-169-028 R8 Spring Collet, 9/32 Round,
3-169-031 R8 Spring Collet, 5/16 Round,
3-169-034 R8 Spring Collet, 11/32 Round,
3-169-037 R8 Spring Collet, 3/8in Round,
3-169-040 R8 Spring Collet, 13/32 Round,
3-169-043 R8 Spring Collet, 7/16 Round,
3-169-046 R8 Spring Collet, 15/32 Round,
3-169-050 R8 Spring Collet, 1/2in Round,
3-169-053 R8 Spring Collet, 17/32 Round,
3-169-056 R8 Spring Collet, 9/16 Round,
3-169-059 R8 Spring Collet, 19/32 Round,
3-169-062 R8 Spring Collet, 5/8in Round,
3-169-065 R8 Spring Collet, 21/32 Round,
3-169-068 R8 Spring Collet, 11/16 Round,
3-169-071 R8 Spring Collet, 23/32 Round,
3-169-075 R8 Spring Collet, 3/4in Round,
3-169-078 R8 Spring Collet, 25/32 Round,
3-169-081 R8 Spring Collet, 13/16 Round,
3-169-084 R8 Spring Collet, 27/32 Round,
3-169-087 R8 Spring Collet, 7/8in Round,
3-169-099 R8 Spring Collet, 1in Round,
3-169-113 R8 Spring Collet Set,13pc,1/8-7/8in Rnd,
3-169-127 R8 Spring Collet Set,27pc,1/16-7/8in Rnd,
3-169-602 R8 Spring Collet, 2mm Round mm,
3-169-603 R8 Spring Collet, 3mm Round mm,
3-169-604 R8 Spring Collet, 4mm Round mm,
3-169-605 R8 Spring Collet, 5mm Round mm,
3-169-606 R8 Spring Collet, 6mm Round mm,
3-169-607 R8 Spring Collet, 7mm Roundmm,
3-169-608 R8 Spring Collet, 8mm Round mm,
3-169-609 R8 Spring Collet, 9mm Round mm,
3-169-610 R8 Spring Collet, 10mm Round,
3-169-611 R8 Spring Collet, 11mm Round,
3-169-612 R8 Spring Collet, 12mm Round,
3-169-613 R8 Spring Collet, 13mm Round,
3-169-614 R8 Spring Collet, 14mm Round,
3-169-615 R8 Spring Collet, 15mm Round,
3-169-616 R8 Spring Collet, 16mm Round,
3-169-617 R8 Spring Collet, 17mm Round,
3-169-618 R8 Spring Collet, 18mm Round,
3-169-619 R8 Spring Collet, 19mm Round,
3-169-620 R8 Spring Collet, 20mm Round,
3-169-669 R8 Spring Collet Set, 19Pc, 2-20mm,
3-169-927 R8 Spring Collet, Box f7-169-127,27Pc St,
3-120-010 SawArbor, 1/2,5/8,3/4,7/8,1Hole, R8 Shnk,
7-188-820 6-Slot Nut for ER20 CAT-BT-MT-NST-R8,
7-188-9016 6-Slot Nut Wrench for ER16 Collet Chuck,
7-188-9020 6-Slot Nut Wrench for ER20 Collet Chuck,
7-188-9025 6-Slot Nut Wrench for ER25 Collet Chuck,
7-188-9032 6-Slot Nut Wrench for ER32 Collet Chuck,
7-188-9040 6-Slot Nut Wrench for ER40 Collet Chuck,
7-188-911 Hex Nut Wrench for ER11 Collet Chuck,
7-188-916 Hook Wrench for ER16 & ER20,
7-188-925 Hook Wrench for ER25 Collet Chuck,
7-188-932 Hook Wrench for ER32 & TG75 Collet Chuck,
7-161-110 R8 TG100 Collet Chuck, 3-1/8 in,
7-180-901 Round Nut for TG75 Collet Chuck (Hook),
7-180-9100 Round Nut for TG100 Collet Chuck (New),
7-180-915 Round Nut for TG150 Collet Chuck,Metric,
7-180-9150 Round Nut for TG150 Collet Chuck, Inch,
7-180-930 Hook Wrench for ER40 & TG100 ColletChuck,
7-180-935 Hook Wrench for TG150 Collet Chuck,
7-193-805 Hex Nut for DA200 Collet Chuck,
7-193-805S Hex Nut (Slim) for DA200 Collet Chuck,
7-193-810 Hex Nut for DA100 Collet Chuck,
7-193-818 Hex Nut for DA180 Collet Chuck,
7-193-905 Hex Nut Wrench for DA200 Collet Chuck,
7-193-905S Hex Nut Wrench for DA200 Collet Chuck,
7-193-910 Hex Nut Wrench for DA100 Collet Chuck,
7-193-918 Hex Nut Wrench for DA180 Collet Chuck,
7-065-005 R8 Shell End Mill Arbor, R8 x 1/2,
7-065-010 R8 Shell End Mill Arbor, R8 x 3/4,
7-065-015 R8 Shell End Mill Arbor, R8 x 1,
7-065-020 R8 Shell End Mill Arbor, R8 x 1-1/4,
7-065-025 R8 Shell End Mill Arbor, R8 x 1-1/2,
7-052-801 Drill Chuck Arbor, R8 to JT1,
7-052-802 Drill Chuck Arbor, R8 to JT2,
7-052-803 Drill Chuck Arbor, R8 to JT3,
7-052-804 Drill Chuck Arbor, R8 to JT4,
7-052-805 Drill Chuck Arbor, R8 to JT5,
7-052-806 Drill Chuck Arbor, R8 to JT6,
7-052-833 Drill Chuck Arbor, R8 to JT33,
7-115-005 Milling Mach Adapter, R8 to MT2,
7-115-010 Milling Mach Adapter, R8 to MT3,
7-070-005 R8 Stub Arbor, R8 - 1,
7-070-010 R8 Stub Arbor, R8 - 1-1/4,
7-030-005R Nut for Machine Arbors, 7/8 - 14 RH,
7-030-010R Nut for Machine Arbors, 1 - 14 RH,
7-030-015R Nut for Machine Arbors, 1-1/4- 12 RH,
7-030-020R Nut for Machine Arbors, 1-1/2- 12 RH,
7-030-025R Nut for Machine Arbors, 2 - 12 RH,
7-030-030R Nut for Machine Arbors, 2-1/2- 12 RH,
7-982-500 Cutter Holdr R8 Shank,R8x3/4x1.3/4in,
3900-0006 COLLET SET 6PC R8,
3900-0007 COLLET SET R8 11PC
3900-0008 COLLET 1/16 IN  R8
3900-0009 COLLET SET 23PC R8
3900-0101 HOLDER 3/16 IN  R8 MILL
3900-0102 HOLDER 3/8 IN  R8 MILL
3900-0103 HOLDER 1/2 IN  R8 MILL
3900-0104 HOLDER 5/8 IN  R8 MILL
3900-0105 HOLDER 3/4 IN  R8 MILL
3900-0106 HOLDER 7/8 IN  R8 MILL
3900-0107 HOLDER 1 IN   R8 MILL
3900-0108 HOLDER 1-1/4 IN  R8 MILL
3900-0109 HOLDER 1-1/2 IN  R8 MILL
3900-0112 HOLDER 1/4 IN  R8 MILL
3900-0121 HOLDER 7/16 IN  R8 MILL
3900-0801 COLLET 3/32 IN  R8
3900-0802 COLLET 1/8 IN  R8
3900-0803 COLLET 5/32 IN  R8
3900-0804 COLLET 3/16 IN  R8
3900-0805 COLLET 7/32 IN  R8
3900-0806 COLLET 1/4 IN  R8
3900-0807 COLLET 9/32 IN  R8
3900-0808 COLLET 5/16 IN  R8
3900-0809 COLLET 11/32 IN R8
3900-0810 COLLET 3/8 IN  R8
3900-0811 COLLET 13/32 IN R8
3900-0812 COLLET 7/16 IN  R8
3900-0813 COLLET 15/32 IN R8
3900-0814 COLLET 1/2 IN  R8
3900-0815 COLLET 17/32 IN  R8
3900-0816 COLLET 9/16 IN  R8
3900-0817 COLLET 19/32 IN R8
3900-0818 COLLET 5/8 IN  R8
3900-0819 COLLET 21/32 IN R8
3900-0820 COLLET 11/16 IN R8
3900-0821 COLLET 23/32 IN R8
3900-0822 COLLET 3/4 IN  R8
3900-0823 COLLET 25/32 IN R8
3900-0824 COLLET 13/16 IN R8
3900-0825 COLLET 27/32 IN R8
3900-0826 COLLET 7/8 IN  R8
3900-0827 COLLET 1 IN  R8
3900-1005 HOLDER SET 5PC R8 MILL
3900-1008 HOLDER SET 8PC R8 MILL
3900-1112 COLLET SET 5C 69PC
3900-1211 HOLDER 5/16 IN  R8 MILL
3900-1711 HOLDER 1/2 IN  R8 SHELL MILL
3900-1712 HOLDER 3/4 IN  R8 SHELL MILL
3900-1713 HOLDER 1 IN  R8 SHELL MILL
3900-1714 HOLDER 1-1/4 IN  R8 SHELL
3900-1715 HOLDER 1-1/2 IN  R8 SHELL MILL
3900-1812 SLEEVE R8 TO MT2
3900-1813 SLEEVE R8 TO MT3
3900-1814 SLEEVE R8 TO MT4
3900-0016 COLLET RACK  R8 12PC
3900-0110 ARBOR 1 IN  R8 MILL
3900-0111 ARBOR 1-1/4 IN  R8
3900-1605 COLLET RACK (48)  R8

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