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Collet Standards and Dimensions

Clamping diameter, clamping range, and nut thread for each ER collet size, plus other collet standards. Taken from collet manufacturers' catalogs and technical documents; where manufacturers' values differ, they are shown side by side.

▦ER collet quick reference (ISO 15488)

SizeClamping diameter (mm)Clamping range (mm)Outside diameter (mm)Nut thread
ER80.5〜5[1][2][3]0.5[2][3]8.5[4][3]M10×0.75 (mini nut type only)[1][3]
ER110.5〜7[1][2][3]0.5[2][3]11.5[4][3]Standard M14×0.75 / mini M13×0.75[1][3]
ER16
  • REGO-FIX:0.5〜10[1][2]
  • Techniks:0.5〜10.5[3]
1 source · reference
  • REGO-FIX:Nominal 1.0–2.5: 0.5; nominal 3.0–9.5: 1.0; nominal 10: 0.5 (9.5–10)[2]
  • Techniks:Nominal ≤2.0: 0.5; 2.5 and above: 1.0[3]
1 source · reference		17[4][3]Standard M22×1.5 / mini M19×1[1][3]
ER201 source · reference
  • REGO-FIX:Nominal ≤2.5: 0.5; 3.0–9.5: 1.0; 10–13: 0.5[2]
  • Techniks:Nominal ≤2.0: 0.5; 2.5–14: 1.0[3]
1 source · reference		21[4][3]
  • REGO-FIX:Standard (ER/ERC/ERB) M24×1.5, mini (ERM) M28×1.5, AX M28×1.5[1]
  • Techniks:Standard M25×1.5, mini M24×1.0[3]
1 source · reference
ER251 source · reference
  • REGO-FIX:Nominal ≤2.5: 0.5; 3.0–9.5: 1.0; 10–17: 0.5[2]
  • Techniks:Nominal 2.0–2.5: 0.5; 3.0 and above: 1.0[3]
1 source · reference		26[4][3][9]Standard M32×1.5[1][3]
ER321 source · reference1[2][3]33[4][3]M40×1.5[1][3]
ER401 source · reference1[2][3]41[4][3]M50×1.5[1][3]
ER501 source · reference
  • REGO-FIX:2.0 on all part numbers (e.g. Ø36 = 34–36)[2]
  • Techniks:Nominal ≤10: 1.0; 12 and above: 2.0[3]
1 source · reference		52[4][3]M64×2[1][3]

The clamping range is the span of diameters a single collet can hold. Even for the same collet, some manufacturers' documents give a different maximum diameter or nut thread; in that case both are shown.

How an ER collet works (ER32 cross-section)
HolderColletsNutTool shankd8°30°8°: surface that seats in the holder's tapered bore: surface the nut pushes onTightening the nutdrives the collet into the 8°taper bore, and the slotsclose togrip the toolClamping diameter dNominal dia. –Nominal dia. − clamping range(ER32: usually 1 mm)

Schematic cross-section of an ER32 (outside diameter 33 mm, length 40 mm), drawn with the 8° angle (ISO 15488) and the 30° nut-side angle (from the REGO-FIX drawing). Details of the nut and holder and the collet slots (cut alternately from front and back) are omitted.

Printed from Kezuriba (kezuriba.net/en/tooling/collets/)

ER collets (by size)

Illustration: ER collet
Illustration (not an exact drawing)

ER8DIN 6499-B / ISO 15488 Form B (DIN 6499 was withdrawn and merged into DIN ISO 15488:2006-01)

Taper angle
8[5][6][4]The "8° setting angle" in the standard title. It appears to be the per-side angle; the claim of a 16° included angle comes only from a Lyndex-Nikken search-result snippet. Nut side is 30° (REGO-FIX drawing)
Size
ER8
Clamping diameter (mm)
0.5〜5[1][2][3]Nominal diameters 1.0–5.0 in 0.5 steps. The smallest collet (nominal 1.0) grips 0.5–1.0
Clamping range (mm)
0.5[2][3]0.5mm on all part numbers (REGO-FIX product pages uniformly say "1", but the per-part-number XML says 0.5)
Collet outside diameter (mm)
8.5[4][3]Maximum outside diameter D1
Collet length (mm)
  • REGO-FIX:13.6[4]
  • Techniks:13[3]
1 source · reference
Nut thread
M10×0.75 (mini nut type only)[1][3]REGO-FIX's ER8 exists only as a bore for the ERM (mini) type
Runout
  • REGO-FIX:Standard 10 μm / UP 5 μm[7][8]
  • Techniks:Average .0002" (approx. 5 μm)[3]
1 source · reference
The runout grade table in the DIN 6499 standard itself has not been verified

ER11DIN 6499-B / ISO 15488 Form B

Taper angle
8[5][4]
Size
ER11
Clamping diameter (mm)
0.5〜7[1][2][3]Nominal 1.0–7.0 in 0.5 steps
Clamping range (mm)
0.5[2][3]0.5mm on all part numbers
Collet outside diameter (mm)
11.5[4][3]
Collet length (mm)
18[4][3]
Nut thread
Standard M14×0.75 / mini M13×0.75[1][3]REGO-FIX also has an AX type, M18×1
Runout
  • REGO-FIX:Standard 10 μm / UP 5 μm[7][8]
  • Techniks:Average .0002"[3]
1 source · reference

ER16DIN 6499-B / ISO 15488 Form B

Taper angle
8[5][4]
Size
ER16
Clamping diameter (mm)
  • REGO-FIX:0.5〜10[1][2]
  • Techniks:0.5〜10.5[3]
1 source · referenceMaximum diameter differs by manufacturer
Clamping range (mm)
  • REGO-FIX:Nominal 1.0–2.5: 0.5; nominal 3.0–9.5: 1.0; nominal 10: 0.5 (9.5–10)[2]
  • Techniks:Nominal ≤2.0: 0.5; 2.5 and above: 1.0[3]
1 source · referenceREGO-FIX product pages uniformly say "1"
Collet outside diameter (mm)
17[4][3]
Collet length (mm)
27.5[4][3]REGO-FIX gives L=26 only for nominal 9.5–10 (27.5 depending on production)
Nut thread
Standard M22×1.5 / mini M19×1[1][3]
Runout
  • REGO-FIX:Standard 10 μm / UP 5 μm[7][8]
  • HAIMER:5 μm (high-precision type)[9]
  • SCHUNK:5 μm[10]
  • Techniks:Average .0002"[3]

ER20DIN 6499-B / ISO 15488 Form B

Taper angle
8[5][4]
Size
ER20
Clamping diameter (mm)
1 source · reference
Clamping range (mm)
  • REGO-FIX:Nominal ≤2.5: 0.5; 3.0–9.5: 1.0; 10–13: 0.5[2]
  • Techniks:Nominal ≤2.0: 0.5; 2.5–14: 1.0[3]
1 source · referenceThe 0.5 shown for the larger diameters in REGO-FIX's XML does not match the "1" on its product page
Collet outside diameter (mm)
21[4][3]
Collet length (mm)
31.5[4][3]
Nut thread
  • REGO-FIX:Standard (ER/ERC/ERB) M24×1.5, mini (ERM) M28×1.5, AX M28×1.5[1]
  • Techniks:Standard M25×1.5, mini M24×1.0[3]
1 source · referenceSources disagree. The nuts are not interchangeable, so a warning is needed when listing this
Runout
  • REGO-FIX:Standard 10 μm / UP 5 μm[7][8]
  • HAIMER:5 μm[9]
  • SCHUNK:5 μm[10]
  • Techniks:Average .0002"[3]

ER25DIN 6499-B / ISO 15488 Form B

Taper angle
8[5][4]
Size
ER25
Clamping diameter (mm)
1 source · referenceThe maximum of 17 is agreed by two companies
Clamping range (mm)
  • REGO-FIX:Nominal ≤2.5: 0.5; 3.0–9.5: 1.0; 10–17: 0.5[2]
  • Techniks:Nominal 2.0–2.5: 0.5; 3.0 and above: 1.0[3]
1 source · referenceHAIMER's ER25 Ø12 is 11–12 (= 1.0), which agrees with Techniks
Collet outside diameter (mm)
26[4][3][9]
Collet length (mm)
34[4][3]HAIMER gives 1.378" = 35mm
Nut thread
Standard M32×1.5[1][3]REGO-FIX's mini (ERM) is M30×1
Runout
  • REGO-FIX:Standard 10 μm / UP 5 μm[7][8]
  • HAIMER:5 μm[9]
  • SCHUNK:5 μm[10]
  • Techniks:Average .0002"[3]

ER32DIN 6499-B / ISO 15488 Form B

Taper angle
8[5][4]
Size
ER32
Clamping diameter (mm)
1 source · referenceThe commonly quoted "2–20" refers to the set contents (Techniks sets are 2–20)
Clamping range (mm)
1[2][3]1.0mm on all part numbers
Collet outside diameter (mm)
33[4][3]
Collet length (mm)
40[4][3]
Nut thread
M40×1.5[1][3]
Runout
  • REGO-FIX:Standard 10 μm / UP 5 μm[7][8]
  • HAIMER:5 μm[9]
  • SCHUNK:5 μm[10]
  • Techniks:Average .0002"[3]

ER40DIN 6499-B / ISO 15488 Form B

Taper angle
8[5][4]
Size
ER40
Clamping diameter (mm)
1 source · reference
Clamping range (mm)
1[2][3]
Collet outside diameter (mm)
41[4][3]
Collet length (mm)
46[4][3]
Nut thread
M50×1.5[1][3]
Runout
  • REGO-FIX:Standard 10 μm / UP 5 μm[7][8]
  • HAIMER:5 μm[9]
  • SCHUNK:5 μm[10]
  • Techniks:Average .0002"[3]

ER50DIN 6499-B / ISO 15488 Form B

Taper angle
8[5][4]
Size
ER50
Clamping diameter (mm)
1 source · reference
Clamping range (mm)
  • REGO-FIX:2.0 on all part numbers (e.g. Ø36 = 34–36)[2]
  • Techniks:Nominal ≤10: 1.0; 12 and above: 2.0[3]
1 source · referenceThe 2mm collapse on large diameters is agreed by two companies
Collet outside diameter (mm)
52[4][3]REGO-FIX D2=50
Collet length (mm)
60[4][3]
Nut thread
M64×2[1][3]
Runout
  • REGO-FIX:Standard 10 μm / UP 5 μm[7][8]
  • Techniks:Average .0002"[3]
1 source · reference
HAIMER does not carry ER50

Other collets

DIN 6388 (OZ / EOC / SYOZ types)EOC8 / EOC12, SYOZ20 / EOC16 / SYOZ25

Standard
DIN 6388 (withdrawn) → DIN ISO 10897:2006-01 (ISO 10897; ISO 10897:2016 is current in the ISO catalogue)
Taper
1:10[11][12]The "taper ratio 1:10" in the standard title. The angle conversion (included angle approx. 5.72°) is a calculated value
Size
EOC8 / EOC12, SYOZ20 / EOC16 / SYOZ25
Clamping diameter (mm)
—[3]1 source · referenceTechniks range: EOC8 = 1/8"–3/8", 3/4/8mm; EOC12 = 1/8"–1/2", 10mm; SYOZ25 = 1/8"–1", 10/16/20/25mm; EOC16 = 1/8"–5/8", 2–16mm. The range in the standard itself is unverified
Clamping range (mm)
0.4[3]1 source · reference1/64"
Collet outside diameter (mm)
EOC8 14.4 / SYOZ20, EOC12 20 / EOC16 25.5 / SYOZ25 35[3]1 source · referenceLengths: EOC8 26, SYOZ20 34, EOC16 40, SYOZ25 52 (mm)
Runout
  • Techniks:T.I.R. .0004" (approx. 10 μm)[3]
1 source · reference
Use: tool holding (drills, end mills). A type that predates ER

TG (Erickson single angle)TG75 / TG100 / TG150

Standard
Industry standard of the Erickson family (not an ISO or DIN standard)
Taper angle
—Not confirmed in public sourcesThe claim of an 8° included angle (ER is 16°) is visible only in a Lyndex-Nikken search-result snippet; full text not verified
Size
TG75 / TG100 / TG150
Clamping diameter (mm)
—[3][13]1 source · referenceTechniks: TG75 = 3/32" up (set is 1/8–3/4"), TG100 = 3/32"–1" (chuck .094–1.0"), TG150 = set 1/2–1-1/2"
Clamping range (mm)
0.4[3]1 source · referenceTechniks "Clamping range: 1/64"". Kennametal's 100TG 0.4mm appears only in a search-result snippet
Collet outside diameter (mm)
TG75 27 / TG100 35 / TG150 51[3]1 source · referenceLengths 47 / 60 / 76 mm
Runout
  • Techniks:T.I.R. .0004"[3]
1 source · reference
Use: holding end mills and drills

DA (Erickson double angle)DA100 / DA180 / DA200 / DA300

Standard
Industry standard of the Erickson family
Taper angle
—Not confirmed in public sourcesNo angle value found in manufacturer documents
Size
DA100 / DA180 / DA200 / DA300
Clamping diameter (mm)
—[3]1 source · referenceTechniks range: DA180 = 1/16–3/4", DA100 = 1/16–9/16", DA200 = 3/64–3/8", DA300 = 3/64–1/4"
Clamping range (mm)
  • Techniks:1/64" (0.4mm)[3]
  • Kennametal:0.30–0.80mm depending on diameter (search-result snippet only; unverified)[14]
1 source · reference
Collet outside diameter (mm)
DA180 1.035" / DA100 .769" / DA200 .531" / DA300 .375"[3]1 source · referenceLengths 1.625 / 1.438 / 1.188 / 1.000"
Runout
  • Kennametal:TIR 0.025mm (search-result snippet only; unverified)[14]
Not confirmed in public sources
Use: mainly drilling, reaming and tapping

5C5C

Standard
Industry standard of the Hardinge family (16C, 20C, 25C and 3J are other sizes of the same family)
Taper angle
—[16]Not confirmed in public sourcesRoyal Products says only "10° angle"; it is unclear whether this is per side or included
Size
5C
Dimensions
Rear diameter 1.250" (31.75), overall length 3.281" (83.34), thread 1.238"×20 RH, internal stop thread 1.041"×24[15]1 source · reference
Clamping diameter (mm)
0.5〜27[15]1 source · referenceRound up to 1-1/16" (26.99mm), hex 7/8", square 3/4". Metric items run 0.5–27mm in 0.5 steps
Clamping range (mm)
—Not confirmed in public sourcesHardinge documents give no collapse range (basically a dedicated collet for each diameter)
Runout
  • Hardinge:Standard .001" or less / special precision .0002" (.005mm) or less[15]
1 source · reference
Use: workholding on lathes (collet closers). Also used in milling and grinding fixtures

DIN 6343 (for lathes, push-out type)161E / 163E / 171E / 173E / 185E, etc.

Standard
DIN 6343 (1961-04 edition, withdrawn)
Standard status
Withdrawn[17]1 source · reference
Taper angle
—Not confirmed in public sourcesThe angle appears only on shop pages
Size
161E / 163E / 171E / 173E / 185E, etc.
Clamping diameter (mm)
—[18]Not confirmed in public sourcesThe 3–42mm value for 173E comes only from Knuth, which is also a dealer
No tooling manufacturer documents found

Straight collets (for milling chucks; each maker's own design)BIG C collets (C20/C25/C32, etc.), OCA

Standard
Proprietary standard
Taper angle
None (straight)[20]1 source · reference
Size
BIG C collets (C20/C25/C32, etc.), OCA
Clamping diameter (mm)
6〜40[19]1 source · referenceC collets ø6–40mm. OCA (for coolant) ø6–32mm
Clamping range (mm)
—[19]Not confirmed in public sourcesDedicated item for each shank diameter (no collapse range stated)
Reducing sleeves for gripping thin shanks in a large milling chuck. Other makers' products not surveyed

BIG NEW BABY (NBC collet)NBC6 / 8 / 10 / 13 / 16 / 20 / 25

Standard
Proprietary standard (BIG DAISHOWA)
Taper angle
—Not confirmed in public sourcesNot stated
Size
NBC6 / 8 / 10 / 13 / 16 / 20 / 25
Clamping diameter (mm)
0.25〜25[21][22]1 source · referenceSet contents (inch → mm): NBC6 0.25–6, NBC8 0.5–8, NBC10 1.5–10, NBC13 2.5–13, NBC16 2.5–16, NBC20 2.5–20, NBC25 15.5–25. The chuck's gripping range is ø0.25–20mm
Clamping range (mm)
0.25 (small diameters) / 0.5 (large diameters)[23]1 source · referenceE.g. NBC10-1.75AA = 1.5–1.75, NBC10-10AA = 9.5–10. EAA (for end mills) is fixed-size
Runout
  • BIG DAISHOWA:AA grade: 1 μm at the collet mouth, 3 μm at the test bar tip (4D). Every unit inspected twice[23][22]
1 source · reference
Not interchangeable with ER

📚Sources

Values with no mark agree across two or more independent publishers. The runout tolerance table for ER (DIN 6499) is only in the paid standard text, so manufacturers' published values are given.

  1. REGO-FIX AG, "Technical data: ER collet cavities and matching clamping nuts" (clamping range and nut thread by size)
  2. REGO-FIX AG, "DIN 4000 XML per product (J4 = clamping range, e.g. ER32 Ø12)". Tallied from the XML of all 283 standard ER products
  3. Techniks USA, "Collets & Nuts Catalog (ER, DNA, TG, DIN 6388, DA, nuts)"
  4. REGO-FIX AG, "Technical data: ER collets dimensions" (D1, D2, L; 8° in the drawing)
  5. ISO, "ISO 15488:2003 Collets with 8 degree setting angle for tool shanks" (2nd edition, confirmed in 2020)
  6. DIN Media, "DIN 6499 [withdrawn] Collets with 8° setting angle → DIN ISO 15488:2006-01"
  7. REGO-FIX AG, "ER Standard collets" (product page: DIN 6499-B / ISO 15488, ER 8–50, clamping diameter 1.0–36.0, Clamping range 1, Runout 10 μm)
  8. REGO-FIX AG, "ER Ultra precision (ER-UP) collets" (Runout 5 μm)
  9. HAIMER GmbH (own official web shop), "High precision collet ER" (ISO 15488, Runout accuracy 5 μm, ER16–ER40)
  10. SCHUNK, "ER collets PGR 5003" (DIN ISO 15488-B, runout and repeat accuracy 5 µm)
  11. DIN Media, "DIN 6388 [withdrawn] Collets for tool holder with taper ratio 1 : 10 → DIN ISO 10897:2006-01"
  12. DIN Media, "DIN ISO 10897" (ISO 10897:1996, taper ratio 1:10) (shown as withdrawn on the page)
  13. Techniks USA, "Collet Chucks Catalog" (TG100 chuck clamping range .094–1.0")
  14. Kennametal, "DA collets" (search summary only; full text not checked)
  15. Forkardt Hardinge, "Hardinge Spindle Tooling 2348J" (dimensions, holding capacity, and TIR for 5C/16C/20C/25C/3J)
  16. Royal Products, "5C Step Collet" ('close on the 10° angle')
  17. DIN, "DIN 6343 Push-out Collets / Druck-Spannzangen", 1961-04 edition, Withdrawn
  18. KNUTH Werkzeugmaschinen (machine tool maker and dealer), "Collets DIN 6343/173E" (3–42mm, length 94mm)
  19. BIG DAISHOWA「Vol.5 p.407–408 C COLLETS ø6–40mm / OCA ø6–32mm」
  20. BIG DAISHOWA, "Straight Collets (C / AC / SL)"
  21. BIG DAISHOWA, "Vol.3 p.375 NEW BABY COLLET SET" (clamping range by series, inch)
  22. BIG DAISHOWA, "High Performance Tooling Solutions Vol.5 p.24 NEW BABY CHUCK" (ø0.25–20mm, 1μm at nose / 3μm at 4d)
  23. BIG DAISHOWA, "NEW BABY COLLET" (AA grade, 1µm at the nose and 3µm at the test bar tip, EAA = fixed size for end mills)