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ASME B16.11 threaded fittings

Views: 17 Author: LILY GUO Publish Time: 2016-03-25 Origin: www.kaysensteel.com

ASME B16.11 threaded fittings

• THREADED FITTINGS GENERAL

Socket weld fittings, threaded fittings are mainly used for small pipe diameters; generally for piping whose nominal diameter is NPS 4 or smaller.
The dimensional standards for taper pipe threads are given in ASME B1.20.1.
This document gives all required dimensions including number of threads per inch, pitch diameter, and normal engagement lengths for all pipe diameters.

1. Threaded piping is commonly used in low-cost, noncritical applications such as domestic water, fire protection, and industrial cooling water systems.
2. Threaded fittings are normally made of cast gray or malleable iron, cast brass or bronze, or forged alloy and carbon steel, standless steel.
3. They are available in three pressure ratings: 2000lbs, 3000lbs and 6000lbs.

• NPT THREAD

All fittings on this page are described, are provided with NPT thread, according to ASME B1.20.1.
The American National Pipe Thread Tapered, is the best known and most widely used connection where the pipe thread provides both the mechanical joint and the hydraulic seal.
NPT has a tapered male and female thread which seals with Teflon tape or jointing compound.

DIMENSIONS OF AMERICAN TAPER PIPE THREAD, WITH SEALANT COMPOUND

Dia Nominal NPT	Major Diameter mm	Tapping Drill Size mm	TPI	Pitch mm
1/16"	7.895	6.00	27	0.941
1/8"	10.242	8.25	27	0.941
1/4"	13.616	10.70	18	1.411
3/8"	17.055	14.10	18	1.411
1/2"	21.223	17.40	14	1.814
3/4"	26.568	22.60	14	1.814
1"	33.228	28.50	11.5	2.209
1 1/4"	41.985	37.00	11.5	2.209
1 1/2"	48.054	43.50	11.5	2.209
2"	60.092	55.00	11.5	2.209
2 1/2"	72.699	65.50	8	3.175
3"	88.608	81.50	8	3.175
3 1/2"	101.316	94.30	8	3.175
4"	113.973	107.00	8	3.175
5"	141.300	134.384	8	3.175
6"	168.275	161.191	8	3.175
8"	219.075	211.673	8	3.175
10"	273.050	265.311	8	3.175
12"	323.850	315.793	8	3.175

• TYPES OF THREADED FITTINGS BY CLASS AND SIZE

Description	Class Designation
Description	2000	3000	6000
Elbows 45 and 90 degrees Tees, Crosses, Coupling Half-Coupling, Cap	1/2 - 4	1/2 - 2	1/2 - 2
	1/2 - 4	1/2 - 2	1/2 - 2
	1/2 - 4	1/2 - 2	1/2 - 2
Pipe Wall	SCH 80 and XS	SCH 160	XXS

Clik here to know more about pipe fittings:

1. Elbow:
45Degree CS butt weld elbow 90Degree CS butt weld elbow 180Degree CS butt weld elbow street elbow

45Degree SS butt weld elbow 90Degree SS butt weld elbow
45Degree socket weld elbow 90Degree socket weld elbow 180Degree SS butt weld elbow

45Degree threaded elbow 90Degree threaded elbow

2. Tee:
CS butt weld straight tee CS butt weld reducing tee          socket weld tee
SS butt weld straight tee       SS butt weld reducing tee    threaded tee

Lateral tee:
Butt weld lateral tee       High Pressure lateral tee

3. Cross:
SS butt weld straight cross   SS butt weld reducing cross      Socket weld cross      Threaded cross

4. Reducer:
SS concentric reducer     SS eccentric reducer
CS concentric reducer   CS eccentric reducer

5. Cap:
SS butt weld cap socket weld cap   threaded cap

6. Stub end:
CS stub end SS stub end

7. Coupling:
socket weld full coupling   socket weld half coupling     threaded full coupling     threaded half coupling

8. Union:
socket weld union     threaded union

9. Socket insert

10. Plug:
hex head plug square head plug    round head plug

11. Bushing:
hex head bushing

12. Nipple:
TBE          PBE           TOE&POE Hex Nipple

13. Swaged nipple:
concentric swage nipple    eccentric swage nipple

14. Flange:
Orifice flange    lap joint flange    threaded flange       socket weld flange       weld neck flange    blind flange slip on flange
long weld neck flange   plate flange     spectacle blind

15. Outolet:
weldolet    socketolet    laterolet           nipoflange     nipolet