Engineered Plastic Backup Rings - All Seals Inc
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Back-Up RingsBack-Up RingsSingle TurnTF91AS8791/12.5Single TurnTF74MS287742.7Single Turn, PistonTF1177PAS4716 (Groove)2.9Single Turn, RodTF1177RAS4716 (Groove)2.11Single Turn, PistonTF1201PAS58602.13Single Turn, RodTF1201RAS58602.16Single Turn, Heavy DutyTF450BACR12BM2.19Single Turn, Extended SeriesTF74CCOORSTEK2.22Solid, Extended SeriesTF74SCOORSTEK2.22SolidTF95MS275952.26Solid, Heavy 83MS287832.32Single Turn, Boss ConnectionTF58MS90582.33Single Turn, Tube FittingTF73MS287732.33Spiral, Extended SeriesTF171COORSTEK2.34Part Numbering SystemEXAMPLE:BASIC PART NUMBERDASH NO.MATERIAL CODE(unfilled PTFE if ommitted)Alternate Numbering System:MS28AS0791/1-1192.2TF456 - 119 - 801TFXXX - XXX - XXXFunction of PTFE Back-Up RingsTFE back-up rings are designed to preventextrusion in rubber O-ring sealing systems.PRubber O-rings generally serve as effectiveseals for dynamic and static applications inhydraulic and pneumatic systems equipment.One big drawback of rubber O-rings is theirtendency to extrude into the clearance of matingsurfaces when subjected to increasing pressuresand temperatures. Elevated temperatures (160 F and higher) impose a severe burden on thephysical and mechanical properties of rubberO-rings, which further increases their tendencyto extrude.The combination of high pressures and hightemperatures is a common occurrence inpresent day fluid systems. Moreover, the trendis toward still higher pressures and longer resident times at elevated temperatures. This placesmore emphasis on the role of the back-up ringin preventing O-Ring extrusion.Standard Configurationshere are three basic types of PTFE back-uprings in use: single turn (scarf cut), multiturn (spiral cut), and solid (uncut) configurations.TAnew series of Single Turn Cut Back-UpRings, designated as AS8791/1, has beenadded to this catalog. The AS8791/1 configuration was developed to provide improved fit inthe O-Ring Glands designed to MIL-P-5514 Rev.C, D, E and MIL-G-5514. The M8791/1 SeriesBack-Up Rings have superseded MS28774Back-Up Rings for new design.CoorsTek, Inc.El Segundo Operations2051 East Maple AvenueEl Segundo, CA 90245HTables of these standards and a cross reference to applicable CoorsTek catalog numbersare given in this catalog.Extended Sizesn addition to the military standards, CoorsTeksupplies three series of extended dash sizestandards, which provide back-up rings for allO-Rings in the Aerospace Standard AS568AUniform Numbering System. These configurations, TF74S, TF74C, and TF171 have provenvery useful to fluid systems designers becauseof the added flexibility in size selection. Becauseextended sizes usually are available directly fromthe factory or distributor stocks, industrial usersare assured of the same quality and service thatapplies to the most sophisticated aerospaceapplications.IFilled Back-Up Ringsor applications where sealing systems aresubjected to severe duty cycles, or wherepressures exceed 3,000 psi and temperaturesare above 275 F, filled PTFE back-up rings arevery useful.F 1.310.322.8030 Tel 1.310.640.0312 Faxplasticseals@coorstek.comwww.coorstek.com2 back-upringsPagemetaplast II3 springsealsReference Standard&4 tetracapunilock sealsCoorsTek Standardtetraflex5 pistonsealsPTFE Back-Up RingHeavy Duty Back-Up Ringseavy Duty back-up rings are configured witha greater axial thickness (T) dimension. Theextra thickness provides more extrusion protection for O-Rings. These rings are interchangeable with MS27595, MS28774, MS28782 andMS28783 back-up rings used in MIL-G-5514packing glands. Heavy duty rings are availablein the solid (uncut) TF456 and in the single turn(scarf cut) TF450 configurations.6 o-ringsA Word About Back-Up Ringsmetallic7 sealsTable of Contents1 tetralonmaterialsGeneral Information8 tetralonbearingsGeneral Information2.3
Back-Up RingsBack-Up RingsC(AS8791/1)PSee note 4Notes:1. All dimensions are in inches2. Surfaces shall be smooth and free from irregularities. Edgesshall be clear and sharp.3. Scarf cut: Placing Back-Up Ring over mandrel of Ø M 0.001scarf cut gap shall not exceed dimension G and no overlap ofthe scarf ends is permitted beyond dimension T.4. Direction of scarf cut is optional. Exceptions to scarf cutangle:-005-006-00733 - 36 30 - 33 24 - 27 metaplast II3 springseals-00442 - 45 See note 5G (gap)See note 3T5. For use in standard grooves conforming to MIL-G-5514 andMIL-P-5514C, D and E revisions.ØMDASHNO.ØM-0040.076-0241.131CoorsTek is a leading designer and manufacturer of components, integrated assemblies for the semiconductorcapital equipment market, and other high technology applications. Serving a wide variety of industries in theglobal economy, CoorsTek uses technical ceramics, presicion-machined metals, engineered plastics, and otherhigh-performance materials to provide Amazing Solutions to enable our customers' products to overcome technological barriers and improve performance – especiallly in demanding or severe service environments.-0050.108-0251.193The CoorsTek highly qualified staff may assist with material selection and product design. Please contact ustoday at 310-322-8030 for more 253-2140.9980.0520.0480.0540.052CoorsTek, Inc.El Segundo Operations0.0050.0002051 East Maple AvenueEl Segundo, CA 902450.0560.0520.0870.0850.0060.000 1.310.322.8030 Tel 1.310.640.0312 00.1180.0060.000tetraflex5 pistonsealsDASHNO.&4 tetracapunilock sealsAngleØM 0.0016 o-ringsDash No.2 back-upringsWmetallic7 sealsI22 19 Ends to be parallelto center line 5 lease contact your CoorsTek distributor orthe factory direct for assistance in the selection of materials that will best fit your needs.n addition to the more common fills suchas glass fibers, CoorsTek has accumulatedconsiderable experience with back-up rings ofNylon, Kel-F, FEP, UHMW, PEEK, and others. Wehave produced this catalog using these materialsas well as more specialized compounds of PTFE.2.4TF91are should be taken in selecting a compoundthat is compatible with the gland or rodmaterials of construction to prevent abrasion orwear 8 tetralonbearingsTFC-086 is a material well suited for highpressure, high-temperature applicationsagainst hardened and/or use with chromenon-abrasive compounds. It is suitable foruse against both hard anodized surfaces andmost non-heat hardenable metals. Both ofthese materials provide wear resistance superior to unfilled PTFE when used in conjunction with MIL-P-83461 O-Ring compound inMIL-H-83282 and MIL-H-5606 hydraulic fluids.TF91 Single Turn1 tetralonmaterialsGeneral Information2.5
Back-Up RingsBack-Up .0860.1840.1820.0070.000*For larger Back-Up Rings in this series, uncut Back-Up Rings TF95 are 4(MS28774)22 19 Ends to be parallelto center line 5 See note 4WNotes:1. All dimensions are in inches2. Surfaces shall be smooth and free from irregularities. Edgesshall be clear and sharp.3. Scarf cut: Placing Back-Up Ring over mandrel of Ø M 0.001scarf cut gap shall not exceed dimension G and no overlap ofthe scarf ends is permitted beyond dimension T.4. Direction of scarf cut is optional. Exceptions to scarf cutangle:Dash -00735 - 39 30 - 33 27 - 30 23 - 26 2 back-upringsØMWØM 0.001metaplast II3 springseals1.0600.0060.000DASHNO.TG (gap)See note 3T5. For use in standard grooves conforming to MIL-G-5514 andMIL-P-5514C, D and E 72.685CoorsTek, Inc.El Segundo Operations2051 East Maple AvenueEl Segundo, CA 90245 1.310.322.8030 Tel 1.310.640.0312 FaxTWG0.0520.0450.0870.0850.0060.000&4 tetracapunilock seals-215Gtetraflex5 ek.com6 o-ringsDASHNO.Tmetallic7 sealsØM8 tetralonbearingsDASHNO.TF74 Single Turn1 tetralonmaterialsTF91 Single Turn2.7
Back-Up RingsBack-Up 070.000TWGTF1177P 0.000W -0.003(AS4716)BreakedgesØM 0.001Notes:1. All dimensions are in inches2. Surfaces shall be smooth and free from irregularities. Edgesshall be clear and sharp.3. Diameters are average and do not imply roundness.4. For use with standard grooves conforming to AS4716.5. Made of thermoplastic material. Refer to Materials section.2 .0100.0000.086CoorsTek, Inc.El Segundo Operations0.0550.0452051 East Maple AvenueEl Segundo, CA 90245 1.310.322.8030 Tel 1.310.640.0312 FaxWT0.0860.0550.0450.1200.0550.045metaplast II3 springseals2.758DASHNO.&4 tetracapunilock seals-148Gtetraflex5 pistonsealsØMW6 ek.commetallic7 sealsØM8 tetralonbearingsDASHNO.TF1177P, Single Turn, Piston1 tetralonmaterialsTF74 Single Turn2.9
Back-Up RingsBack-Up 93.3690.0750.065WT(AS4716) 0.000W -0.003Notes:1. All dimensions are in inches2. Surfaces shall be smooth and free from irregularities. Edgesshall be clear and sharp.3. Diameters are average and do not imply roundness.4. For use with standard grooves conforming to AS4716.5. Made of thermoplastic material. Refer to Materials section.ØM 0.0012 back-uprings-220TTF1177RBreak 191.3091.5492.100.1850.0750.0650.2380.086CoorsTek, Inc.El Segundo Operations0.0550.0452051 East Maple AvenueEl Segundo, CA 90245 1.310.322.8030 Tel 1.310.640.0312 FaxWT0.0860.0550.0450.1200.0550.045metaplast II3 springsealsO.D.REF.&4 tetracapunilock sealsØMTtetraflex5 pistonsealsDASHNO.W6 ek.commetallic7 sealsØM8 tetralonbearingsDASHNO.TF1177R, Single Turn, Rod1 tetralonmaterialsTF1177P Single Turn, Piston2.11
Back-Up RingsBack-Up 201PT(AS5860)OD 0.001A Ends to be parallelto center line 5 W 0.001See note 42 back-uprings-220DASHNO.WØM 0.001Notes:1. All dimensions are in inches2. Surfaces shall be smooth and free from irregularities. Edges shall be clear and sharp.3. Scarf cut: Placing Back-Up Ring over mandrel of Ø M 0.001 scarf cut gap shall not exceeddimension G and no overlap of the scarf ends is permitted beyond dimension T.4. Direction of scarf cut is optional.5. For use in standard grooves conforming to plast II3 springsealsO.D.REF.G (gap)See note 3T 0.002DegreesDASHNO.ØMOD—35 -39 -0261.262—0.111—32 -36 -0271.325—-0060.124—29 -33 -0281.388—-0070.155—24 -27 -1040.122—31 -35 -0080.187—-1050.153—26 -29 -0090.220—-1060.185—23 -26 211.078—-0251.198—-1221.140—T0.054CoorsTek, Inc.El Segundo OperationsW0.052GA0.0050.00019 -22 2051 East Maple AvenueEl Segundo, CA 90245 1.310.322.8030 Tel 1.310.640.0312 FaxTWG0.0540.0520.0050.0000.0580.081ADegrees19 -22 &4 tetracapunilock sealsØMTtetraflex5 pistonsealsDASHNO.W6 o-ringsO.D.REF.0.0060.00019 -22 metallic7 sealsØM8 tetralonbearingsDASHNO.TF1201P Single Turn, Piston1 tetralonmaterialsTF1177R Single Turn, Rodplasticseals@coorstek.comwww.coorstek.com2.13
Back-Up RingsBack-Up 8—3.493-339—3.61819 -22 0.0580.08112 -15 �5.599-227—2.368-431—5.7242.1419 -22 0.0620.11112 -15 T0.062W0.111G0.0060.000ADegrees12 -15 .128W0.226G0.0080.000ADegrees12 -15 G0.1280.2260.0080.000ADegrees12 -15 2 back-uprings-124ADegrees19 -22 0.0880.171metaplast II3 springseals—G&4 tetracapunilock seals1.203W0.0070.000tetraflex5 pistonseals-123T6 o-ringsOD12 -15 metallic7 sealsØM0.1280.2260.0080.0008 tetralonbearingsDASHNO.TF1201P Single Turn, Piston1 tetralonmaterialsTF1201P Single Turn, PistonCoorsTek, Inc.El Segundo Operations2051 East Maple AvenueEl Segundo, CA 90245 1.310.322.8030 Tel 1.310.640.0312 Faxplasticseals@coorstek.comwww.coorstek.com2.15
Back-Up RingsBack-Up RingsTF1201R Single Turn, RodG (gap)See note 3DASHNO.ØM-004T 0.002ADASHNO.ØM0.07635 -39 -0261.248-0050.10832 -36 -0271.311-0060.12329 -33 -0281.374-0070.15424 -27 -1040.12331 -35 -0080.185-1050.15426 -29 -0090.217-1060.18523 -26 85-1221.1232.1619 -22 T0.0540.058W0.0530.081G0.0050.000A19 -22 0.0060.00019 -22 93.24719 -22 0.0580.08112 -15 305.122-2272.123-4315.24719 -22 0.062CoorsTek, Inc.El Segundo Operations0.11212 -15 2051 East Maple AvenueEl Segundo, CA 90245 1.310.322.8030 Tel 1.310.640.0312 FaxTWGA0.0620.1120.0060.00012 -15 2 back-uprings1.185A19 -22 0.0880.173metaplast II3 springsealsNotes:1. All dimensions are in inches2. Surfaces shall be smooth and free from irregularities. Edges shall be clear and sharp.3. Scarf cut: Placing Back-Up Ring over mandrel of Ø M 0.001 scarf cut gap shall not exceeddimension G and no overlap of the scarf ends is permitted beyond dimension T.4. Direction of scarf cut is optional.5. For use in standard grooves conforming to AS5857-123G&4 tetracapunilock sealsØM 0.001ØMW0.0070.000tetraflex5 pistonsealsSee note 4DASHNO.T12 -15 6 o-ringsW 0.001A Ends to be parallelto center line 5 ØMmetallic7 ls@coorstek.comwww.coorstek.com8 tetralonbearingsTF1201R1 tetralonmaterialsTF1201R Single Turn, Rod2.17
Back-Up RingsBack-Up A12 -15 80.00012 -15 TF450(BACR12BM) 0 A -3 G (gap)dimension to be met withring over a mandrel of ØMEnds to be parallelto center line 5 5.997Notes:1. Dimension A in degrees, all others in inches.2. This part dimensionally equivalent to Boeing SCD BAC R12 BM. If ordered under the Boeing partnumber, it will be supplied to BMS 8-121, Type I, Class I, Grade B. If ordered under TF450, it willbe supplied in TFE per AMS 3656 / AMS 3660.3. Dash numbers correspond to those of AS-568 numbering system.4. This part is designed for use in glands per MIL-P-5514C thru F.5. Gap dimension to be met with retainer over a mandrel of ØM.2 back-upringsWØMmetaplast II3 91.564TWGA60 45 30 0.0010.0580.0540.0540.0520.0050.00022 CoorsTek, Inc.El Segundo Operations2051 East Maple AvenueEl Segundo, CA 90245Tol.TWGA 0.0010.0580.0540.0540.0520.0050.00022 0.0010.0620.0580.0870.0850.0060.00022 tetraflex5 pistonsealsDASHNO.Tol. 1.310.322.8030 Tel 1.310.640.0312 Faxmetallic7 sealsØM8 tetralonbearingsDASHNO.&4 tetracapunilock sealsØM6 o-ringsDASHNO.TF450 Single Turn, Heavy Duty1 tetralonmaterialsTF1201R Single Turn, Rodplasticseals@coorstek.comwww.coorstek.com2.19
Back-Up RingsBack-Up ASHNO.ØM-3474.247Tol.TWG 2.498-3342.6230.0060.000 83.122-3393.24722 -3443.872-2332.875-3453.997-2343.000-3464.1222.20 0.0020.1180.1200.0070.00022 0.1180.1220.2350.2370.0080.00017 0.0010.1180.1220.2350.2370.0080.00017 0.003&4 tetracapunilock seals-1360.0600.064 0.001Atetraflex5 pistonseals22 G 0.0010.0880.0920.1820.1840.0070.0006 o-rings0.0060.000W17 metallic7 seals0.0870.085T8 tetralonbearings 0.0010.0620.058 0.00217 Tol.1 tetralonmaterialsØMmetaplast II3 springsealsDASHNO.TF450 Single Turn, Heavy Duty2 back-upringsTF450 Single Turn, Heavy DutyCoorsTek, Inc.El Segundo Operations2051 East Maple AvenueEl Segundo, CA 90245 1.310.322.8030 Tel 1.310.640.0312 Faxplasticseals@coorstek.comwww.coorstek.com2.21
Back-Up RingsBack-Up RingsG (gap)See note 3Ends to be parallelto center line 5 WØM (NOM)ØM-0011TW 32G0.029/0.0310.0400.0452 3 8 8-1392 3 16-1748 3 4-2302 1 2-1402 1 4-1759-2312 5 8-1412 5 16-1769 1 4-2322 3 4 32-1422 3 8-1779 1 2-2332 7 8 4-1432 7 16-1789 3 4-2343 16-1442 1 2-2353 1 8 8-1452 9 16 16-2363 1 4 16-146 4-2373 3 8 2 16-2383 1 2 8-2393 5 8 16-2403 3 4 2-2413 7 8-2424-2434 1 8-110-0362 3 8-1117-0372 1 2-1121-0382 5 8-1139-0392 3 4-1145 8-0402 7 8-11511 16-0413-1163-0423 1 4-11713 16-0433 1 2-1187 8-0443 3 4-11915 16-0454-1201-1211 1 16-12211-0464 1 4-0231 1 16-0474 1 2-0241 8-0484 42.220.0050.000731 7 8-229-0221-2258 1 22 4151 3 4-173-035-021-2242 1 8 1671 5 8-1383-020-223 32-1091372 1 42 8-019-167-228-034TF74 and TF95 Dash Sizes1 1 28 1 4 4 4-222-172536 3 42 1 161-018-166-1371Dash Nos. 004 thru 025 correspond to1 7 16 16-10811-2212 82-0176 1 2-227-0335-1658 32-016TF74 and TF95 Dash Sizes-171-107 161 3 821 89-220-136-032-0156 1 42 160.0540.052-164-226570.0520.045Dash Nos. 110 thru 149 correspond to7 3 4-049-106 21 5 16-170ØM1 41-2191 15 161 3 16DASHNO.-031-0146-135-025G 32 16-1637 1 2W371 1 2-169T3-013-1281 7 8ØM50.0050.0001 1 4-134DASHNO.-105 8-2187 1 41 5 835 3 4-168-030-012-1621 13 16 8-0111 7 16-13315-1271 3 4-104-0101 3 16-132TF74S and TF74C contain dash sizesbeyond those shown on TF74 and TF951 1 21-21741 - 45 -02975 1 2-102 to -106 32-009-1611 11 163-0081 3 8-131T-1033-12619 - 20 1 3 8-0071 1 8-007-0285-2161 5 8 6415 1 4-1301-006-16024 - 26 -10231 5 1627 - 29 1 5 16-005-125-006-02751 1 16-0050.046/0.048-004-2151 9 165 1 4 165-1291 1 41-15935 - 39 -026-0031 1 4G41 - 45 0.039/0.0413-124W-004-050 64-002ØMT-001 to -003TDASHNO.ØM 0.000-123 32 0.0000.0520.0450.0870.0850.0080.00032 5 8-2021-1472 11 16-2035 16-1482 3 4-2043 8-1492 13 16-2057-1502 7 8-2061-1513-2079-1523 1 4-2085 8-1533 1 2-20911 16-2444 1 4 16-1543 3 4-2103 4-2454 3 8Dash Nos. 110 thru 149 correspond to-1554-21113 16-2464 1 2TF74 and TF95 Dash Sizes-1564 1 4-2127-2474 5 81 1 8-1574 1 2-21315-2484 3 41 3 16-1584 3 4-214-2494 7 8 4 , Inc.El Segundo Operations 16 8 80.0520.0450.1200.1180.0060.000Dash Nos. 210 thru 247 correspond toTF74 and TF95 Dash Sizes 1612051 East Maple AvenueEl Segundo, CA 90245 1.310.322.8030 Tel 1.310.640.0312 FaxWG0.0060.000Dash Nos. 210 thru 247 correspond to1-201 16T2 back-upringsSee note 4ØMWmetaplast II3 springseals22 19 DASHNO.TTF74 and TF95 Dash Sizes0.0520.045&4 tetracapunilock sealsNotes:1. All dimensions are in inches2. Surfaces shall be smooth and free from irregularities. Edgesshall be clear and sharp.3. Scarf cut: Placing Back-Up Ring over mandrel of Ø M 0.001scarf cut gap shall not exceed dimension G and no overlap ofthe scarf ends is permitted beyond dimension T.4. Direction of scarf cut is optional. Exceptions to scarf cutangle:Dash No.AngleBack-Up, rstek.com0.0070.000tetraflex5 pistonsealsBack-Up, Single TurnDASHNO.6 o-ringsTF74Smetallic7 sealsTF74C1 tetralonmaterialsTF74C Single Turn / TF74S Solid Extended Series0.0080.0008 tetralonbearingsTF74C Single Turn / TF74S Solid Extended Series2.23
Back-Up RingsBack-Up RingsGDASHNO.ØMDASHNO.ØM-3097 16-3443 7 8-379 2-3454 16-3464 1 8 8-3474 1 4-2515 1 8-3101-2525 1 4-3119-2535 3 8-3125-2545 1 2TWG 16-313-34811-2555 5 8-3143-2565 4-31513-2575 8-3167-2586-31715-2596 1 4-318-2606 1 2-261WG0.0070.0004 3 8DASHNO.DASHNO.ØM11-431-38011 1 2-381-382-383DASHNO.ØM5 1 4-45412 1 2-4325 3 8-4551312-4335 1 2-45613 1 213-4345 5 8-45714-4355 3 4-45814 1 2-45915-46015 1 2-46116-46216 1 2ØMTWG0.0090.00014TWG0.0080.000-3494 1 2-38415-4365 7 8-35054 8-38516-4376-3514 3 4-38617-4386 1 4-3524 8
Heavy Duty Back-Up Rings Heavy Duty back-up rings are configured with a greater axial thickness (T) dimension. The extra thickness provides more extrusion protec-tion for O-Rings. These rings are interchange-able with MS27595, MS28774, MS28782 and MS28783 back-up rings used in MIL-G-5514 packing glands. Heavy duty rings are available
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2.4 Homomorphism and quotient rings 28 2.5 Special rings 30 2.6 Modules 34 2.7 Rings with chain conditions 35 3. Smarandache rings and its properties 3.1 Definition of Smarandache ring with examples 38 3.2 Smarandache units in rings 41 3.3 Smarandache zero divisors in rings 46
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Tank 6 API-653 In-Service, Internal Inspection Report less severe corrosion than the west perimeter. The average thickness of the sketch plates away from the west perimeter was 0.281”. Other than the perimeter corrosion noted, the remainder of the tank bottom showed no signs of significant metal loss and the thickness readings appeared consistent with the readings from the 2004 robotic .
