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1、1/8-27 1/2 20 .4662 .4619 .4675 112 .223 .217 .250 .406 - 1/4-18 5 $ .5875 .5828 .5889 5/ .287 .278 -318 .309 .312 .531 .223 .217 .156 .297 - .44 .36 .12 1.03 .97 .38 .46 -18 .223 .217 .219 .344 .50 .41 .16 1.09 1.03 .38 .46 .16 .56 .47 .19 1.19 1.13 .38 .21 - .2 .54 .22 1.47 1.41 .56 .69 .24 144265
2、 441382 441392 120703 118748 116749 118750 118751 118752 116487 110287 144266 144267 441383 441384 144476 441385 441386 441387 441368 441389 441390 441391 192115 191408 191407 191430 192124 192119 192120 192122 441393 441394 Nominal Tube OD A Dryseal Pipe Thread (NFTF) C Hexagon Width, Basic D1 Coun
3、terbore Dia, Maximum Counterbore Dia, Minimum 114 5/16 5/16 318 318 318 314 1/4-18 1/4-18 3/8-18 1/8-27 3/8-16 1/2-14 3/4-14 9/16 9/16 11/16 5/8 11/16 7 /e 1-1/16 .318 .318 .412 .223 .412 .568 .756 .309 .309 .403 .217 .403 .559 .747 1.72 1.69 .75 .91 -30 2.22 2.16 .75 .97 .43 Material UM; me last th
4、read sitail be chamfered 11 to 1 pitch long from G diameter and dimension J may be reduced by an amount eauai to 112 pitch. 3 Tap drill dwths given require use of bottoming taps to produce standard full thread lmgth. we General Specifications. 4 Minimum applies to turned boss construction. Where app
5、lied to chamfer on full hexagon verrion, diameter may be reduced by .OZ. ADDITIONAL TUBE TO PIPE SIZE COMBINATIONS I Material 8 I :;E I I Brass I Chromium-Bright Brass Nickel-Dull 1- For dimensions see Page L-2.101. UNIONS Nominal Tube OD Material Finish GM Part Number Material Brass Brass Bominal T
6、ube OD 3/8 3/9 7/16 7/16 1/2 1/2 5/8 5/8 GM Part Numbe- 143460 143476 143461 143477 143462 143478 143463 143479 Finish Chromium-Bright Nickel-Dull 1/8 1 /8 3/16 3/16 1 / 4 1 / 4 5/16 5/16 Brass Brass Brass Brass Bra s s Brass Brass Brass Chromium-Bright Nickel-Dull 143456 143472 143457 143473 143458
7、 143474 143459 143475 Chromium-Bright Nickel-Dull Brass Brass Chromium-Bright Nickel-Dull Chromium-Bright Nickel-Dull Brass Brass Chromium-Bright Nickel-Dull Chromium-Bright Nickel-hill Brass Brass Chromium-Bright Nickel-Dull For dimensions see Page L-2.103 45O ELI WS Nominal Tube OD Nominal Tube OD
8、 Finish GM Number GM Number Material Finish Pipe I 1/8 1/8 3/16 3/16 1/4 1 /4 5/16 5/16 5/16 5/16 Brass Brass Brass Brass Chromium-Bright 142869 142870 Nickel-Dull 3/8 3/8 7/16 7/16 1/2 1/2 5/8 5/8 3/4 3/4 Brass Chromium-Bright Brass Nickel-Dull Brass Chromium-Bright Brass Nickel-Dull i43359 163390
9、Chromium-Bright 143361 Nickel-Dull 143394 Chromium-Bright Nickel-hill 143360 143391 143362 143395 Brass Chromium-Bright 142560 Brass Nickel-Dull I 143392 1 Brass Brass Brass Chromium-Bright 142757 B?as s Nicke 1 -Du1 1 143393 I I For dimensions see Pages L-2.104 and L-2.105. Printed in U S A ENGRG S
10、TDS PAGE L-2.151 MARCH, 1970 Copyright General Motors North America Provided by IHS under license with GM Licensee=IHS Employees/1111111001, User=Japan, IHS Not for Resale, 06/24/2008 01:08:35 MDTNo reproduction or networking permitted without license from IHS -,-,- 9432236 142824 143366 143390 7/16
11、 1/4 7/16 1/4 1/2 3/8 1/2 3/% Brass Brass Chromium-Bright Nickel-hill GENERAL MOTORS ENGINEERING STANDARDS INVERTED FLARED TUBE FITTINGS ADDITIONAL MATERIALS OR FINISHES 90 ELBOWS Nominal Pipe I Number I 1 O D “ 1 Size GM Thread Material Finish Nominal Tube OD 1/8 1/8 3/16 3/16 3/16 1/4 i/4 1 1 4 1/
12、4 5/16 5/16 * GM 44. For dim GM Part Number 142758 143400 9432238 142825 143367 143401 143368 9432239 143369 143403 Material Finish I 1- 143363 1 143397 1 i 1 i$: Chromium-Bright Nickel-Dull Brass Brass Brass Brass Chrcwium-Bright Nickel-hill Brass Brass Steel Brass Brass Chromium-Bright Nickel-Dull
13、 Phosphate Coated* Chromium-Bright Nickel-Dull 9432235 143398 I 1 ; $ : i i$ 189949 Brass Chromium-Bright Brass 1 Nickel-Dull Brass Brass Chrcmium-Bright Nickel-Dull Brass 1 Chromium-Bright Brass Nickel-Dull 9432237 5/8 1/2 116368 1 1 5/8 1 1/2 Brass Chromium-Bright Brass Nickel-Dull I I 1, A, speci
14、fication. :e Pages L-2.106 and L-2.107. FEMALE 90 ELBOWS Nominal Tube OD Pipe Thread Size Material Finish GM Part Number Material Finish GM Part Number 5 / 1 6 For dirr 175176 Brass e Page L Chromium-Bright .108. . - . _ TWO WAY TEES Nominal Tube OD GM Part Number Material Finish Number Finish Brass
15、 Brass Chromium-Bright Nickel-Dull 143495 143511 9432211 143515 143500 143516 143501 143517 143502 143518 Brass Brass Chromium-Bright Nickel-Dull Chromium-Bright Nickel-hill 1/4 Brass 1/4 Brass Brass 2% Brass Brass % ; : A : I 187322 I 177971 1 188947 I 187712 I 456588 1 Dryseal American Standard Ta
16、per Pipe Thread. See General SDecificationr 2 Measured from the face of cone seat to last full form thread at maior diameter. See General Specifications. A minimum of .75 partial thread beyond last full rhread is required. Inverted Flared Tube Fittings must conform to General Specifications on Page
17、L-2.501. These specifications were developed without considering whether patents may or may not be involved. fore, the supplier shall be required to assume patent liability. In all cases, there- Printed in U S A ENGRG STDS PAGE L-2.205 OCTOBER, 1973 Copyright General Motors North America Provided by
18、 IHS under license with GM Licensee=IHS Employees/1111111001, User=Japan, IHS Not for Resale, 06/24/2008 01:08:35 MDTNo reproduction or networking permitted without license from IHS -,-,- GENERAL MOTORS ENGINEERING STANDARDS 173466 . LIGHT INVERTED FLARED TUBE FEMALE 90“ ELBOWS NOT RECOMMENDED - VSE
19、 FEMALE 90 ELBOWS SHOWN ON PAGE L-2.108 443928 226339 443941 188948 DIAJ I I Nominal Tube OD A B D E F I J K L R u X Xt Dryseal Pipe Thread (NPTF) Straight Thread Pitch Mameter, Maximum Pitch Mameter, Minimum Minor Dia, Maximum for Brass Minor Dia. Maximum for Steel Minor Mameter, Minimum Passage Ma
20、meter, Maximum Passage Mameter, Minimum Seat Mameter, Maximum Seat Mametery Minimum Ease Seat Ma Maximum Base Seat ma: Minimum (Ref) Base Seat Depth, Maxfmum Base Seat Depth, Minimum End Full Thread, Maximum2 Seat Depth, Maximum Seat Depth, Minimum Overall Length, Maximum Overall Length, Minimum Sea
21、t Radius, Maximum Countersink Dia, Maximum Countersink Ma, Minimum Body Widthy Basic Boss Width, Basic Material or where design permits, corners may be chamfered to the diameter of the abutting surface pro- viding the length of chamferoat hexagon corner does not ex- ceed that produced by the 30 cham
22、fer previously described. Passages: Where passages in straight fittings are machined from opposite ends, any offset occurring at the meeting point shall not exceed .C15 inch. The cross-sectional area at junction of passages in angle fittings shall not be less than that of the smallest passage. Wall
23、Thickness: Unless otherwise designated, the wall thickness at any point onfittings shall not be less than the thickness established by the specified dimensions, tolerances and eccentricities for inner and outer surfaces. Contours: Details of fitting contours shall be optior.al with manufacturer prov
24、ided specified dimensions are main- tained and the serviceability of fittings is not impaired. Wrench flats on forged shapes for elbows and tees shall be optional. Where extruded or forged shapes are reduced to conserve material; the resulting minimum wall thicknesses, unless otherwise specified, sh
25、all not be less than the re- spective values tabulated below: Wall Thickness, Wall Thick!ess, Miniuum Minimum * Applies to reduction in one plane of shape only. Straight Threads: Unified Standard Class 2A external threads and Class 2B internal threads with minor diameters modified to Class 3B limits
26、 for brass fittinas. shall awlv to plain finish (unplated) fittings. For externally thrdd parts with additive finish, the maximum diameters of Class 2A may be exceeded by the amount of the allowance; that is, the basic diameters (Class ZA maximum diameters plus the allow- ance) shall apply after pla
27、ting. For internally threaded parts with additive finish, the Class 2B diameters and the modified minor diameters, where specified, shall apply after plating. The pitch diameter tolerance shall be the same as corres- ponding diameter-pitch combination and class of the Unified coarse and fine thread
28、series or for special diameter-pitch combinations shall be based on dianeter, pitch and a length of engagement of nine times the pitch. See Unified Screw Threads in Section X. For straight thread eccentricity tolerances applicable to tube fittings see Page L-100.102. Where external threads are produ
29、ced by roll threading and the body is not undercut, the diameter of the unthreaded portion of the body adjacent to the shoulder may be reduced to the minimum pitch diameter. External threads shall be chamfered to the diameter of abut- ting surfaces or to diameters specified to produce a length of ch
30、amfered or partial thread ecuivalent to .?5 to 1.25 times the pitch of the thread, rounded to a three-place decimal. Internal threads shall be countersunk 90“ included angle in accordance with the tabulated dimensions. Pipe Threads: Pipe threads, unless there is specific auth- orization to the contr
31、ary, shall conforn with the Dryseal American Standard Taper Pipe Thread (NPTF). See Dryseal Pipe Threads in Section X. The length of full form external pipe thread shall not be shorter than L2 plus one pitch (thread). Where external pipe threads are produced by roll threading, the diameter of the un
32、threaded portion of the body adjacent to the shoulder may be reduced to the E2 pitch diameter. Due to design limitations the tap drill depth for internal pipe threads specified in the tables is less than the stan- dard Dryseal practice. The depth specified necessitates the use of bottouing taps to r
33、oduce full form thread lengths conforming with the (NPTFP standard. Although it is the consensus of manufacturers and users that trouble free assembly and pressure-tight joints can best be assured by the use of full length (NPPF) pipe threads, some installations may justify the use of Dryseal SAE Sh
34、ort Taper Pipe Threads. Special fittings utilizing Dryseal PTF-SAE short pipe threads; having external thread shoulder lengths, internal thread tap drill depths, and overall or end to center lengths reduced in accordance with the reduction in thread length; shall be available under separate part num
35、ber as requested by the purchaser. The length of full form ex- ternal thread shall not be shorter than the L2 length. External pipe threads shall be chamfered to the diameters and lengths specified io Table 1. shall he countersunk 90 , included angle, to the diameters specified in Table 1. Internal
36、pipe threads (Continued on following page) These specifications were developed without considering whether patents may or may not be involved. In all cases, there- fore, the supplier shall be required to assume patent liability. I ENGRG STDS . PAGE L-2.501 MARCH, i970 Copyright General Motors North
37、America Provided by IHS under license with GM Licensee=IHS Employees/1111111001, User=Japan, IHS Not for Resale, 06/24/2008 01:08:35 MDTNo reproduction or networking permitted without license from IHS -,-,- GENERAL MOTORS ENGINEERING STANDARDS -._ I- Pipe Thread Size INVERTED FLARED TUBE FITTINGS GE
38、NERAL SPECIFICATIONS Chamfer Chamfer Countersink Diameter Length Diameter Max Min Min Max Min Max ( Continued) TABLE 1 - DIMENSIONS OF PIPE THREAD CHAMFERS AND COUNTERSINKS External Thread I Internal Thread Nnminnl I Tabulated diameters conform with Appendix A of Dryseal Pipe Thread Standard. Materi
39、al and Manufacture: A s designated by part number, tittings shall be brass or steel conforming to the speci- fications below: Brass fittings, unless otherwise specified, shall be mach- ined from extruded bar shapes conforming to SAE CA360 (half- hard) copper alloy, or from forged blanks conforming t
40、o SAE CA377 copper alloy. Steel fittings, unless otherwise specified, shall be made from low carbon steel of good quality having free machining characteristics. Finishes: As designated by part number, fittings shall be furnished plain, plated or coated in accordance with the OM specifications l i s
41、t e d herein. (Basic features of these specifications are described herein for reference purposes and f u l l details for each are published in the GM Engineer- ing Materials and Processes Standards.) Plain steel: Unless otherwise specified by user, plain (uncoated) steel fittings shall be furnished
42、 with a light o i l film. Zinc Dichromate on steel: GM 4342-M, Code 20D24, zinc plating and subsequent chromate treatment. It iequires a plating thickness of .O002 inch minimum and 24 hours salt spray without white corrosion. Cadmium or zinc plating on brass: GM 4252-M, Code O, speci- fication shall
43、 apply. It requires a flash deposit of cadmium or zinc for coloring or protection in transit and storage. Cadmium and zinc plating on steel: As indicated by part number; cadmium or zinc optional, GM 4252-M; cadmium only, GM 4341-M; or zinc only, GM 4342-M; Code 20, specification shall apply. Each re
44、quires a plating thickness of .O002 inch minimum and 32 hours salt spray. Phosphate coating on steel: As designated by part number, GM 4435-M, Code A, specification requiring phosphate coat- ing plus a subsequent o i l type treatment and 72 hours salt spray; or GM 4276-M specification requiring pnos
45、phate coat- ing plus subsequent treatment w i t h a compound other than paint and 24 hours salt spray; shall apply. Chronium plating on brass: GM 4251-M, Code 20, specifica- tion spa11 apply. It requires nickel and chromium total thickness of .O002 ifich minimum and chromium thickness of .O0001 inch
46、 minimum. Nickel plating on brass: S M 4254-X, Code 20, specification shall apply. it requires nickel thichess of .O002 inch minimum. Copper plating on steel: GM 4250-M, Code O, specification shall apply. It requires a flash deposit of copper for identification or colori%. Worhanshio: Fittings shall
47、 conform t o best commercial quality consistent with good worlonanship. They shall be free from hanging burrs, slivers, seams, loose scale and a l l other defects that might affect their serviceability. Assembly Considerations: Where it is not objectionable from a functional or production standpoint
48、, use of a compatible lubricant or sealant may be desirable in assembling Dryseal pipe thread components to minimize galling and effect a pressure tight seal. These speclflcatlons were developed without considering whether patents may or may not be involved. In a l l cases, there- fore, the supplier
49、 shall be required to assume patent liability. Printed in U.S.A. ENGRG STDS PAGE L-2.502 MARCH, 1970 Copyright General Motors North America Provided by IHS under license with GM Licensee=IHS Employees/1111111001, User=Japan, IHS Not for Resale, 06/24/2008 01:08:35 MDTNo reproduction or networking permitted without license from IHS -,-,- VND.GM VOL II SEC L-ENGL 1972 m 700b377 001L54q bL2 M M