REF: Retaining Ring Sizing Charts


Retaining Rings work by creating a shoulder that can hold components in place. The retaining shoulder is created when the ring attaches itself to the bore or shaft, typically by snapping into a groove. Ordinarily (however not always) a groove is dug into the shaft or bore, and this groove becomes the seat for the retaining ring. Retaining rings are designed such that their contact diameter has some interference fit with the groove in which they fit. This creates a “snug” fit between the ring and groove. The term used to describe the amount of interference fit is “cling”.
Cling causes the retaining ring to fit tightly and securely against its groove bottom. Without cling a ring would have a loose fit and would “rattle” in its groove. This lack of cling would decrease the retention capacity of the ring because a “cling-less” ring is free to move radially, creating weak retention points that will ultimately cause the assembly to fail. Another key factor is the width of the groove. The groove width is slightly larger than the rings thickness, thus creating a snug axial fit. The tight axial fit along with the cling to the groove bottom creates a rigid shoulder which can retain thrust loads. 1)

The phrase “Retaining Ring” is sort of vague and refers broadly over several different types of retaining fasteners. Some names used include: snap rings, wire rings, circlips, lock rings, retainer clips, retainer rings among others. For our purposes, Internal or External are the main words to remember since the rings are machined different for both types of use. Rings for bores are referred to as internal retaining rings, because the ring fits inside a hole (or bore). Similarly rings that fit over shafts are referred to as external retaining rings, because the are installed on the outside (or external) side of a shaft.

Choosing what size retaining ring to buy can be challenging with all the different types and material construction. Mainly, you choose a ring based on the diameter of the housing or shaft. The groove sizes are also shown below but, in general, the piece you are working on should be sized to standard groove dimensions. However, there may be instances where special considerations were made from standards. In addition, retaining rings are made to many standards such as inch, DIN, ANSI METRIC, and JIS.

  • Decide whether the ring installation is for internal or external applications. This determines ring sizing also.
  • Measure the shaft (external) or bore (internal) and choose the ring sized accordingly.
  • Be sure to measure the groove diameter also to make sure that ring will sit properly in it.
    The ring should be snug but too tight and it will stretch beyond what it was made to handle.
    Some rings are made for shallow grooves and some are made for deeper grooves.
    Circlips that wrap around the shaft (axial) require less groove depth than “C” or “E” clips (radial).
  • Most rings have tolerances for installation depending on what size and type of ring it is.
    You can download the full PDFs of the charts below or go to their websites to see all the specs.

External Circlips

External Snap rings are axial retaining rings and are installed into a groove in a shaft or bore along an axis center point. The rings have lugs and lug holes that are used for installation. Once installed, they contact virtually the entire groove. They transmit loads into the groove wall around most of the groove circumference, which lets them withstand significant thrust loadings. 2)

External retaining rings are sized more narrow in the charts than internal rings due to them being spec'd by their inside diameter and meant to expand onto a groove on a shaft.
So comparing, measuring or ordering needs to be done in kind.

The chart below is a reprint from ARCONRING.com. Here is the link to the full PDF.
Some specs are left out for space. The chart below shows general sizing specs for Standard SAE External Circlips.
Check with the manufacturer for exact specs of the brand clips desired.

Standard SAE External Circlips
ARCON
Part#
Shaft Dia Ring Groove Ring Dia
FractionDecimalDiaWidthThickFree Dia
1400-121/8“.125”.117“.012”.010“.112”
1400-155/32“.156”.146“.012”.010“.142”
1400-183/16“.188”.175“.018”.015“.168”
1400-19(5mm).197“.185”.018“.015”.179“
1400-217/32”.219“.205”.018“.015”.196“
1400-2315/16”.236“.222”.018“.015”.215“
1400-251/4.250”.230“.029.025”.225“
1400-27(7 mm).276”.255“.029.025”.250“
1400-289/32”.281“.261”.029.025“.256”
1400-315/16“.312”.290“.029.025”.281“
1400-3411/32”.344“.321”.029.025“.309”
1400-35(9 mm).354“.330”.029.025“.320”
1400-373/8“.375”.352“.029.025”.338“
1400-39(10 mm).394”.369“.029.025”.354“
1400-4013/32”.406“.382”.029.025“.366”
1400-437/16“.438”.412“.029.025”.395“
1400-4615/32”.469“.443”.029.025“.428”
1400-501/2“.500”.468“.039.035”.461“
1400-55(14 mm).551”.519“.039.035”.509“
1400-569/16”.562“.530”.039.035“.521”
1400-5919/32“.594”.559“.039”.035“.550”
1400-625/8“.625”.588“.039”.035“.579”
1400-66(17 mm).669“.629”.039“.035”.621“
1400-6643/64”.672“.631”.039“.035”.621“
1400-6811/16”.688“.646”.046“.042”.635“
1400-753/4”.750“.704”.046“.042”.693“
1400-7825/32”.781“.733”.046“.042”.722“
1400-8113/16”.812“.762”.046“.042”.751“
1400-877/8”.875“.821”.046“.042”.810“
1400-9315/16”.938“.882”.046“.042”.867“
1400-9863/64”.984“.926”.046“.042”.910“
1400-1001”1.000“.940”.046“.042”.925“
1400-102(26 mm)1.023”.961“.046”.042“.946”

The chart below is a reprint from ARCONRING.com. Here is the link to the full PDF.
Some specs are left out for space. The chart below shows general sizing specs for Standard Metric External Circlips.
Check with the manufacturer for exact specs of the brand clips desired.

Standard Metric External Circlips
ARCON
Part#
Shaft
Dia
Ring Groove Ring Dia
Dia Width Depth Thick Free Dia
D1400-33 mm2.8 mm.50 mm.10 mm.40 mm2.7 mm
D1400-44 mm3.8 mm.50 mm.10 mm.40 mm3.7 mm
D1400-55 mm4.8 mm.70 mm.10 mm.60 mm4.7 mm
D1400-66 mm5.7 mm.80 mm.15 mm.70 mm5.6 mm
D1400-77 mm6.7 mm.90 mm.15 mm.80 mm6.5 mm
D1400-88 mm7.6 mm.90 mm.20 mm.80 mm7.4 mm
D1400-9 mm8.6 mm1.10 mm.20 mm1.00 mm8.4 mm
D1400-1010 mm9.6 mm1.10 mm.20 mm1.00 mm9.3 mm
D1400-1111 mm10.5 mm1.10 mm.25 mm1.00 mm10.2 mm
D1400-1212 mm11.5 mm1.10 mm.25 mm1.00 mm11.0 mm
D1400-1313 mm12.4 mm1.10 mm.30 mm1.00 mm11.9 mm
D1400-1414 mm13.4 mm1.10 mm.30 mm1.00 mm12.9 mm
D1400-1515 mm14.3 mm1.10 mm.35 mm1.00 mm13.8 mm
D1400-1616 mm15.2 mm1.10 mm.40 mm1.00 mm14.7 mm
D1400-1717 mm16.2 mm1.10 mm.40 mm1.00 mm15.7 mm
D1400-1818 mm17.0 mm1.30 mm.50 mm1.20 mm16.5 mm
D1400-1919 mm18.0 mm1.30 mm.50 mm1.20 mm17.5 mm
D1400-2020 mm19.0 mm1.30 mm.50 mm1.20 mm18.5 mm
D1400-2121 mm20.0 mm1.30 mm.50 mm1.20 mm19.5 mm
D1400-2222 mm21.0 mm1.30 mm.50 mm1.20 mm20.5 mm
D1400-2323 mm22.0 mm1.30 mm.50 mm1.20 mm21.5 mm
D1400-2424 mm22.9 mm1.30 mm.55 mm1.20 mm22.2 mm
D1400-2525 mm23.9 mm1.30 mm.55 mm1.20 mm23.2 mm
D1400-2626 mm24.9 mm1.30 mm.55 mm1.20 mm24.2 mm

Internal Circlips

Internal retaining rings are sized wider in the charts than external rings due to them being spec'd by their outside diameter and meant to compress into a groove in a bore.
So comparing, measuring or ordering needs to be done in kind.

Standard SAE Internal Circlips
Housing Bore Dia Bore Groove Dia Ring Dia
FractionDecimalMillimeterDiaWidthThicknessFree Dia
1/4“.250” - .268“.018”.015“.280”
5/16“.312” - .330“.018”.015“.346”
3/8“.375” - .397“.029”.025“.415”
7/16“.438” - .461“.029”.025“.482”
29/64“.453” - .477“.029”.025“.498”
1/2“.500” - .530“.039”.035“.548”
.512“13 mm.542”.039“.035”.560“
9/16”.562“ - .596”.039“.035”.620“
5/8”.625“ - .665”.039“.035”.694“
11/16”.688“ - .732”.039“.035”.763“
3/4”.750“19 mm.796”.039“.035”.831“
.777”19.7 mm.825“.046”.042“.859”
13/16“.812” - .862“.046”.042“.901”
.866“22 mm.920”.046“.042”.961“
7/8”.875“ - .931”.046“.042”.971“
.901”22.9.959“.046”.042“1.000”
15/16“.938” - 1.000“.046”.042“1.041”
1“1.000” - 1.066“.046”.042“1.111”
1.023“26 mm1.091”.046“.042”1.136“

The chart below is a reprint from ARCONRING.com. Here is the link to the full PDF.
Some specs are left out for space. The chart below shows general sizing specs for Standard Metric Internal Circlips.
Check with the manufacturer for exact specs of the brand clips desired.

Standard Metric Internal Circlips
ARCON Part# Housing
Bore Dia
Groove Ring
DiaWidthThicknessFree Diameter
D1300-88mm8.4mm.90mm.80mm8.7mm
D1300-99mm9.4mm.90mm.80mm9.8mm
D1300-9.59.5mm9.9mm1.10mm1.00mm10.3mm
D1300-1010mm10.4mm1.10mm1.00mm10.8mm
D1300-1111mm11.4mm1.10mm1.00mm11.8mm
D1300-1212mm12.5mm1.10mm1.00mm13.0mm
D1300-1313mm13.6mm1.10mm1.00mm14.1mm
D1300-1414mm14.6mm1.10mm1.00mm15.1mm
D1300-1515mm15.7mm1.10mm1.00mm16.2mm
D1300-1616mm16.8mm1.10mm1.00mm17.3mm
D1300-1717mm17.8mm1.10mm1.00mm18.3mm
D1300-1818mm19.0mm1.10mm1.00mm19.5mm
D1300-1919mm20.0mm1.10mm1.00mm20.5mm
D1300-2020mm21.0mm1.10mm1.00mm21.5mm
D1300-2121mm22.0mm1.10mm1.00mm22.5mm
D1300-2222mm23.0mm1.10mm1.00mm23.5mm
D1300-2323mm24.1mm1.30mm1.20mm24.6mm
D1300-2424mm25.2mm1.30mm1.20mm25.9mm
D1300-2525mm26.2mm1.30mm1.20mm26.9mm
D1300-2626mm27.2mm1.30mm1.20mm27.9mm

Constant Section Retaining Ring

(AKA, Eaton-style or horseshoe snap ring). 3) A Constant Section Retaining Ring (Snap Ring) is a retaining ring often specified for heavy-duty or impact loading applications. 4) It features a uniform, constant section. This means that the material used to make the ring is the same width at any point along the circumference of the ring. These can be bought from fastener companies in carbon steel as plain or with oil embedded.

SAE Constant Section Rings
Housing
Bore Diameter
Groove Size Ring Dimensions
FractionDecimalMillimeterDiaWidthDepthFree Dia
(outside)
ThicknessFree Gap
1.125”1-1/8“28.58 mm1.181”.046“
+.003”
-.000“
.028”1.196“.042”.375“ - .562”
1.250“1-1/4”31.75 mm1.310“.030”1.330“.042”.375“ - .562”
1.375“1-3/8”34.93 mm1.435“.030”1.460“.042”375“ - .562”
1.500“1-1/2”38.10 mm1.580“.040”1.600“.042”.375“ - .562”
1.625:1-5/8“41.28 mm1.705”.040“1.725”.042“.437” - .750“
1.750”1-3/4“44.45 mm1.830”.040“1.855”.042“.437” - .750“
1.875”1-7/8“47.63 mm1.965”.045“1.990”.042“.437” - .750“
2.000”2“50.80 mm2.090”.045“2.115”.042“.437” - .750“

Bearing Snap Ring

The chart below is a reprint from ARCONRING.com. Here is the link to the full PDF.
Some specs are left out for space. The chart below shows general sizing specs for Bearing Retainer Rings.
Check with the manufacturer for exact specs of the brand clips desired.

This retainer ring below (when installed into a groove) is tough to remove. Normally a spreader tool is used to widen the ring to install it onto a groove of a shaft. The MoCo used one inside the swingarm as a bearing race spacer in the grooved area between the (Timkin) bearings. It is a “Constant Section Retaining Ring” of the “Bearing Snapring” variety with beefier dims than the ones below. There are no known pliers to compress the ring (used internally) due to it having no holes or slots for pliers to compress it.
So it was pried out with screwdrivers in a circle pattern to get the ring out of the groove in the pivot.

Used on 1982-2003 swingarms, all models.
This is the ring installed between the two inner bearing races (and inside the lockring).
It has no part number as it comes in a set with the bearings.

SAE Bearing Snap Rings
Shaft Diameter or
Bearing Bore
Groove Ring Free Gap
Decimal≈MetricDiaWidthDepthDiaWidthThicknessMin-Max
.4724”12.00mm.436“.046”
+.003“
-.000”
.018“.421”.062
±.003“
.042”.062“ - .187”
.5906“15.00mm.550”.053“.020”.538“.078”.047“
.6693”17.00mm.629“+.004”
-.000“
.616”±.003“ .078” - .218“
.7874”20.00mm0.731“.068”.028“.710”.093“
±.003”
.062“
.9843”25.00mm.924“+.004”
-.000“
.030”.910“.109”
±.003“
.156” - .312“
1.1811”30.00mm1.111“.085”
+.004“
-.000”
.035“1.093”.125“
±.005”
.075“
1.3780”35.00mm1.288“ .045”1.265“-.031”.156“.250” - .406“
1.5748”40.00mm1.465“.108”.055“1.452”±.005“.093”
1.7717“45.00mm1.648”+.005“.062”1.625“.188”
1.9685“50.00mm1.844”-.000“ 1.820”±.005“
2.1654”55.00mm2.015“.120”.075“1.995”.218“.109”.250“ - .468”
2.3622“60.00mm2.212”+.005“
-.000”
2.187“
2.5591”65.00mm2.389“ 2.359”
2.7559“70.00mm2.586” 2.556“.250”

"C" Clips

The chart below is a reprint from ARCONRING.com. Here is the link to the full PDF.
Some specs are left out for space. The chart below shows general sizing specs for SAE C-clips. Check with the manufacturer for exact specs of the brand clips desired.

SAE C-Clips
ARCON Part# Shaft
Diameter
Groove Ring
Frac.Dec.mmDiaWidthThicknessFree O.D.Free ID
1800-121/8“.125”3.2mm.106“.020”.015“.165”.102“
1800-155/32”.156“4.0mm.135”.020“.015”.205“.131”
1800-183/16“.188”4.8mm.165“.020”.015“.244”.161“
1800-217/32”.219“5.6mm.193”.029“.025”.275“.187”
1800-2315/64“.236”6.0mm.208“.029”.025“.295”.203“
1800-251/4”.250“6.4mm.220”.029“.025”.311“.211”
1800-289/32“.281”7.1mm.247“.029”.025“.346”.242“
1800-315/16”.312“7.9mm.276”.029“.025”.376“.270”
1800-373/8“.375”9.5mm.335“.029”.025“.448”.328“
1800-4013/32”.406“10.3mm.364”.029“.025”.486“.359”
1800-437/16“.438”11.1mm.393“.029”.025“.517”.386“
1800-501/2”.500“12.7mm.450”.039“.035”.581“.441”
1800-569/16“.562”14.3mm.507“.039”.035“.653”.497“
1800-625/8”.625“15.9mm.563”.039“.035”.715“.553”
1800-6811/16“.688”17.5mm.619“.046”.042“.784”.612“
1800-753/4”.750“19.0mm.676”.046“.042”.845“.665”
1800-8113/16“.812”20.6mm.732“.046”.042“.915”.721“
1800-877/8”.875“22.2mm.789”.046“.042”.991“.777”
1800-9315/16“.938”23.8mm.843“.046”.042“1.058”.830“
1800-1001”1.000“25.4mm.900”.046“.042”1.130“.887”
1800-1121-1/8“1.125”28.6mm1.013“.056”.050“1.267”.997“

The chart below is a reprint from ROTORCLIP.com. Here is the link to the full PDF.
Some specs are left out for space. The chart below shows general sizing specs for their (DC) Metric C-clips. Check with the manufacturer for exact specs of the brand clips desired.

Metric C-Clips (DC)
Rotor
Clip Part#
Shaft Groove Ring
DiaDiaWidthDepthThickFree O.D.Free ID
DC-33mm2.3mm.44mm.35mm.40mm3.98mm2.18mm
DC-44mm3.2mm.44mm.40mm.40mm5.00mm3.00mm
DC-55mm4.0mm.64mm.50mm.60mm6.20mm3.80mm
DC-66mm5.0mm.74mm.50mm.70mm7.40mm4.80mm
DC-77mm6.0mm.85mm.50mm.80mm8.60mm5.80mm
DC-88mm7.0mm.85mm.50mm.80mm10.00mm6.80mm
DC-99mm8.0mm1.10mm.50mm1.00mm11.20mm7.80mm
DC-1010mm9.0mm1.10mm.50mm1.00mm12.15mm8.75mm
DC-1111mm10.0mm1.10mm.50mm1.00mm13.20mm9.65mm
DC-1212mm10.9mm1.10mm.55mm1.00mm14.35mm10.55mm
DC-1313mm11.8mm1.10mm.60mm1.00mm15.40mm11.40mm
DC-1414mm12.7mm1.10mm.65mm1.00mm16.30mm12.30mm
DC-1515mm13.6mm1.10mm.70mm1.00mm17.40mm13.20mm
DC-1616mm14.5mm1.10mm.75mm1.00mm18.50mm14.10mm
DC-1717mm15.4mm1.10mm.80mm1.00mm19.40mm14.90mm
DC-1818mm16.3mm1.30mm.85mm1.20mm20.40mm15.80mm
DC-1919mm17.2mm1.30mm.90mm1.20mm21.50mm16.70mm
DC-2020mm18.1mm1.30mm.95mm1.20mm22.65mm17.55mm

"E" Clips

The chart below is a reprint from ARCONRING.com. Here is the link to the full PDF.
Some specs are left out for space. The chart below shows general sizing specs for E-clips. Check with the manufacturer for exact specs of the brand clips desired.

SAE E-Clips
ARCON Part# Shaft
Diameter
Groove Ring
Frac.Dec.mmDiaWidthThicknessFree O.D.Free ID
1500-4 - .040”1mm.026“.012”.010“.079”.025“
1500-X61/16”.062“1.5mm.052”.012“.010”.140“.051”
1500-Y61/16“.062”1.6mm.052“.023”.020“.187”.051“
1500-61/16”.062“1.5mm.052”.012“.010”.156“.051”
1500-X93/32“.094”2.4mm.074“.020”.015“.230”.069“
1500-93/32”.094“2.4mm.074”.020“.015”.187“.073”
1500-X117/64“.110”2.8mm.079“.020”.015“.375”.076“
1500-121/8”.125“3.2mm.095”.020“.015”.230“.094”
1500-X149/64“.140”3.6mm.102“.020”.015“.203”.100“
1500-Y149/64”.140“3.6mm.110”.020“.015”.250“.108”
1500-149/64“.140”3.6mm.105“.029”.025“.270”.102“
1500-155/32”.156“4.0mm.116”.029“.025”.282“.114”
1500-X1711/64“.172”4.4mm.127“.029”.025“.312”.125“
1500-X183/16”.188“4.8mm.125”.029“.025”.375“.122”
1500-183/16“.188”4.8mm.147“.029”.025“.335”.145“
1500-X217/32”.219“5.6mm.188”.029“.025”.437“.185”
1500-251/4“.250”6.3mm.210“.029”.025“.527”.207“
1500-X315/16”.312“7.9mm.250”.029“.025”.500“.243”
1500-373/8“.375”9.5mm.303“.039”.035“.660”.300“
1500-437/16”.438“11.1mm.343”.039“.035”.687“.337”
1500-X437/16“.438”11.1mm.380“.039”.035“.600”.375“
1500-501/2”.500“12.7mm.396”.046“.042”.800“.392”
1500-625/8“.625”15.9mm.485“.046”.042“.940”.480“
1500-X743/4”.744“19.0mm.625”.056“.050”1.000“.616”
1500-753/4“.750”19.0mm.580“.056”.050“1.120”.574“
1500-877/8”.875“22.2mm.675”.056“.050”1.300“.668”
1500-X981“.984”25.0mm.835“.056”.050“1.500”.822“
1500-X11813/16”1.188“30.2mm1.079”.068“.062”1.626“1.066”
1500-X13713/8“1.375”34.9mm1.230“.068”.062“1.875”1.213“

The chart below is a reprint from ARCONRING.com. Here is the link to the full PDF.
Some specs are left out for space. The chart below shows general sizing specs for E-clips. Check with the manufacturer for exact specs of the brand clips desired.

Metric E-Clips
ARCON Part# Shaft
Diameter
Groove Ring
DiaWidthThicknessFree O.D.Free ID
D1500-.81.20mm0.8mm.24mm.20mm1.95mm.58mm
D1500-1.21.70mm1.2mm.34mm.30mm2.90mm1.01mm
D1500-1.52.25mm1.5mm.44mm.40mm3.85mm1.28mm
D1500-1.92.75mm1.9mm.54mm.50mm4.40mm1.61mm
D1500-2.33.50mm2.3mm.64mm.60mm5.90mm1.94mm
D1500-3.24.50mm3.2mm.64mm.60mm6.80mm2.70mm
D1500-46.00mm4.0mm.74mm.70mm8.80mm3.34mm
D1500-57.00mm5.0mm.74mm.70mm10.75mm4.11mm
D1500-68.00mm6.0mm.74mm.70mm11.75mm5.26mm
D1500-79.50mm7.0mm.94mm.90mm13.80mm5.84mm
D1500-810.50mm8.0mm1.05mm1.00mm15.60mm6.52mm
D1500-912.00mm9.0mm1.15mm1.10mm18.20mm7.63mm
D1500-1013.00mm10.0mm1.25mm1.20mm19.65mm8.32mm
D1500-1215.50mm12.0mm1.35mm1.30mm22.65mm10.45mm
D1500-1520.00mm15.0mm1.55mm1.50mm28.60mm12.61mm
D1500-1925.50mm19.0mm1.85mm1.75mm36.70mm15.92mm
D1500-2431.50mm24.0mm2.05mm2.00mm43.65mm21.88mm




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