HT2F2 by Dixon Valve | Hydraulic Quick Disconnect Coupling | HT-Series | 1/4" Female NPTF x 1/4" ISO16028 Flushface Interchange | Plug | Steel

Save $1.91

$28.44

$28.44 - $28.44

$28.44

$26.53

$26.53 - $26.53

$26.53

Dixon Valve & Coupling
Hydraulic Coupling: HT-Series ISO16028 Flushface Interchange Plug (Female Threads)

Used in equipment for oilfield, industrial hydraulic, and construction.

Quantity

Specifications for Variant SKU: HT2F2 Dixon
Series:	HT-Series
Shape (Orientation):	Straight
Ends Configuration:	1/4in Male ISO-16028 Flush Face QD Interchange, 1/4in Female NPTF
Material(s):	Steel
Seal Material(s):	Polyurethane

Compatibility & Interchange:	Interchangeable to ISO16028. Conforms to ISO16028 interchange standard interchangeable with Danfoss/Eaton/Hansen FF, Parker FEM, Snap-tite 74, Faster FFH/2FFN/2FFI, Stucchi A/FIRG and Holmbury HQ/A/FIMC.
Construction:	Machined components are manufactured using solid bar stock. Stainless steel balls, retaining rings and springs maximize corrosion resistance and extend service life. Steel componentry is plated using ROHS compliant zinc nickel for corrosion resistance. Steel coupler sleeves are hardened to resist deformation and maximize service life.
Seal Components:	1/4", 3/8", 1/2", 3/4", and 1" plugs have molded polyurethane valve seals, with a temperature range of -65°F to 212°F (-54°C to 100°C). 5/8", 1-1/2", and 2" plugs have Nitrile-energized PTFE valve seals, with a temperature range of -40°F to 250°F (-40°C to 121°C). Couplers have a polyurethane valve stem O-ring, with a temperature range of -65°F to 212°F (-54°C to 100°C). Ancillary coupler and plug seals are Nitrile (Nitrile-N), with a temperature range of -40°F to 250°F (-40°C to 121°C). PTFE or TPC-ET anti-extrusion ring protects main coupling valve seal from dynamic impulse pressure damage.
Features:	High flow performance, compact profile. Easily rebuildable! High strength laser-cut valve guide maximizes valve stability while minimizing flow restriction. Improved sealing system incorporates a high performance molded polyurethane or O-ring energized PTFE valve seal.
Additional Information:	For a selection guide, cross reference tables, safety info, fluid compatibility, and other general info, please see: Dixon Valve Quick Disconnect Guide.PDF

HT-Series \| ISO16028 Flushface Rated Pressure Chart
Body Size	Steel Coupler/Plug Coupled		316 SS Coupler/Plug Coupled		Steel Coupler Uncoupled		Steel Plug Uncoupled
Body Size	Max. Working	Burst	Max. Working	Burst	Max. Working	Burst	Max. Working	Burst
1/4"	5,000 PSI 345 Bar	20,000 PSI 1,379 Bar	-	-	5,000 PSI 345 Bar	20,000 PSI 1379 Bar	5,000 PSI 345 Bar	20,000 PSI 1,379 Bar
3/8"	5,000 PSI 345 Bar	20,000 PSI 1,379 Bar	3,500 PSI 241 Bar	17,500 PSI 1,207 Bar	5,000 PSI 345 Bar	20,000 PSI 1379 Bar	5,000 PSI 345 Bar	20,000 PSI 1,379 Bar
1/2"	5,000 PSI 345 Bar	20,000 PSI 1,379 Bar	3,400 PSI 234 Bar	17,000 PSI 1,172 Bar	5,000 PSI 345 Bar	20,000 PSI 1379 Bar	5,000 PSI 345 Bar	20,000 PSI 1,379 Bar
5/8"	5,000 PSI 345 Bar	20,000 PSI 1,379 Bar	2,920 PSI 201 Bar	14,600 PSI 1,007 Bar	5,000 PSI 345 Bar	20,000 PSI 1379 Bar	5,000 PSI 345 Bar	20,000 PSI 1,379 Bar
3/4"	5,000 PSI 345 Bar	20,000 PSI 1,379 Bar	2,920 PSI 201 Bar	14,600 PSI 1,007 Bar	5,000 PSI 345 Bar	20,000 PSI 1379 Bar	5,000 PSI 345 Bar	20,000 PSI 1,379 Bar
1"	5,000 PSI 345 Bar	20,000 PSI 1,379 Bar	2,920 PSI 201 Bar	14,600 PSI 1,007 Bar	5,000 PSI 345 Bar	20,000 PSI 1379 Bar	5,000 PSI 345 Bar	20,000 PSI 1,379 Bar
1-1/2"	3,000 PSI 207 Bar	12,000 PSI 828 Bar	-	-	3,000 PSI 207 Bar	12,000 PSI 828 Bar	3,000 PSI 207 Bar	12,000 PSI 828 Bar
2"	3,000 PSI 207 Bar	12,000 PSI 828 Bar	-	-	3,000 PSI 207 Bar	12,000 PSI 828 Bar	3,000 PSI 207 Bar	12,000 PSI 828 Bar

HT-Series \| ISO16028 Flushface Interchange Plug (Female Threads)

Part Number	Coupling Type	Body Size	Threads	Material	Length	Max. OD	Hex
HT2F2	Plug/Male	1/4"	1/4" - 18 Female NPTF	Steel	1.89" (48.0mm)	0.97" (24.6mm)	7/8"
HT2BF2	Plug/Male	1/4"	1/4" - 19 Female BSPP	Steel	1.89" (48.0mm)	0.97" (24.6mm)	7/8"
HT2OF3	Plug/Male	1/4"	9/16" - 18 Female ORB	Steel	1.89" (48.0mm)	0.97" (24.6mm)	7/8"
HT3F3	Plug/Male	3/8"	3/8" - 18 Female NPTF	Steel	2.48" (63.0mm)	1.10" (27.9mm)	1"
HT3F3-SS	Plug/Male	3/8"	3/8" - 18 Female NPTF	316 Stainless	2.48" (63.0mm)	1.10" (27.9mm)	1"
HT3BF3	Plug/Male	3/8"	3/8" - 19 Female BSPP	Steel	2.48" (63.0mm)	1.10" (27.9mm)	1"
HT3BF3-SS	Plug/Male	3/8"	3/8" - 19 Female BSPP	316 Stainless	2.48" (63.0mm)	1.10" (27.9mm)	1"
HT3OF3	Plug/Male	3/8"	9/16" - 18 Female ORB	Steel	2.48" (63.0mm)	1.10" (27.9mm)	1"
HT3F4	Plug/Male	3/8"	1/2" - 14 Female NPTF	Steel	2.70" (68.6mm)	1.24" (31.5mm)	1-1/8"
HT3F4-SS	Plug/Male	3/8"	1/2" - 14 Female NPTF	316 Stainless	2.70" (68.6mm)	1.24" (31.5mm)	1-1/8"
HT3BF4	Plug/Male	3/8"	1/2" - 14 Female BSPP	Steel	2.70" (68.6mm)	1.24" (31.5mm)	1-1/8"
HT3BF4-SS	Plug/Male	3/8"	1/2" - 14 Female BSPP	316 Stainless	2.70" (68.6mm)	1.24" (31.5mm)	1-1/8"
HT3OF4	Plug/Male	3/8"	3/4" - 16 Female ORB	Steel	2.70" (68.6mm)	1.24" (31.5mm)	1-1/8"
HT4F4	Plug/Male	1/2"	1/2" - 14 Female NPTF	Steel	2.63" (66.8mm)	1.31" (33.3mm)	1-3/16"
HT4F4-SS	Plug/Male	1/2"	1/2" - 14 Female NPTF	316 Stainless	2.63" (66.8mm)	1.31" (33.3mm)	1-3/16"
HT4BF4	Plug/Male	1/2"	1/2" - 14 Female BSPP	Steel	2.63" (66.8mm)	1.31" (33.3mm)	1-3/16"
HT4BF4-SS	Plug/Male	1/2"	1/2" - 14 Female BSPP	316 Stainless	2.63" (66.8mm)	1.31" (33.3mm)	1-3/16"
HT4OF4	Plug/Male	1/2"	3/4" - 16 Female ORB	Steel	2.63" (66.8mm)	1.31" (33.3mm)	1-3/16"
HT4OF5	Plug/Male	1/2"	7/8" - 14 Female ORB	Steel	2.63" (69.3mm)	1.31" (33.3mm)	1-5/16"
HT4F6	Plug/Male	1/2"	3/4" - 14 Female NPTF	Steel	2.73" (71.9mm)	1.44" (36.6mm)	1-5/16"
HT4F6-SS	Plug/Male	1/2"	3/4" - 14 Female NPTF	316 Stainless	2.83" (71.9mm)	1.44" (36.6mm)	1-5/16"
HT4BF6	Plug/Male	1/2"	3/4" - 14 Female BSPP	Steel	2.83" (71.9mm)	1.44" (36.6mm)	1-5/16"
HT4BF6-SS	Plug/Male	1/2"	3/4" - 14 Female BSPP	316 Stainless	2.83" (71.9mm)	1.44" (36.6mm)	1-5/16"
HT4OF6	Plug/Male	1/2"	1-1/16" - 12 Female ORB	Steel	3.03" (77.0mm)	1.44" (36.6mm)	1-5/16"
HT5OF5	Plug/Male	5/8"	7/8" - 14 Female ORB	Steel	2.88" (73.3mm)	1.65" (41.9mm)	1-1/2"
HT5F6	Plug/Male	5/8"	3/4" - 14 Female NPTF	Steel	2.88" (73.3mm)	1.65" (41.9mm)	1-1/2"
HT5F6-SS	Plug/Male	5/8"	3/4" - 14 Female NPTF	316 Stainless	2.88" (73.3mm)	1.65" (41.9mm)	1-1/2"
HT5BF6	Plug/Male	5/8"	3/4" - 14 Female BSPP	Steel	2.88" (73.3mm)	1.65" (41.9mm)	1-1/2"
HT5BF6-SS	Plug/Male	5/8"	3/4" - 14 Female BSPP	316 Stainless	2.88" (73.3mm)	1.65" (41.9mm)	1-1/2"
HT5OF6	Plug/Male	5/8"	1-1/16" - 12 Female ORB	Steel	2.88" (73.3mm)	1.65" (41.9mm)	1-1/2"
HT6OF5	Plug/Male	3/4"	7/8" - 14 Female ORB	Steel	3.42" (86.9mm)	1.65" (41.9mm)	1-1/2"
HT6F6	Plug/Male	3/4"	3/4" - 14 Female NPTF	Steel	3.42" (86.9mm)	1.65" (41.9mm)	1-1/2"
HT6F6-SS	Plug/Male	3/4"	3/4" - 14 Female NPTF	316 Stainless	3.42" (86.9mm)	1.65" (41.9mm)	1-1/2"
HT6BF6	Plug/Male	3/4"	3/4" - 14 Female BSPP	Steel	3.42" (86.9mm)	1.65" (41.9mm)	1-1/2"
HT6BF6-SS	Plug/Male	3/4"	3/4" - 14 Female BSPP	316 Stainless	3.42" (86.9mm)	1.65" (41.9mm)	1-1/2"
HT6OF6	Plug/Male	3/4"	1-1/16" - 12 Female ORB	Steel	3.42" (86.9mm)	1.65" (41.9mm)	1-1/2"
HT6F8	Plug/Male	3/4"	1" - 11-1/2 Female NPTF	Steel	3.54" (89.9mm)	1.92" (48.8mm)	1-3/4"
HT6F8-SS	Plug/Male	3/4"	1" - 11-1/2 Female NPTF	316 Stainless	3.54" (89.9mm)	1.92" (48.8mm)	1-3/4"
HT6BF8	Plug/Male	3/4"	1" - 11 Female BSPP	Steel	3.54" (89.9mm)	1.92" (48.8mm)	1-3/4"
HT6BF8-SS	Plug/Male	3/4"	1" - 11 Female BSPP	316 Stainless	3.54" (89.9mm)	1.92" (48.8mm)	1-3/4"
HT6OF8	Plug/Male	3/4"	1-5/16" - 12 Female ORB	Steel	3.54" (89.9mm)	1.92" (48.8mm)	1-3/4"
HT8F8	Plug/Male	1"	1" - 11-1/2 Female NPTF	Steel	3.50" (88.9mm)	1.96" (49.8mm)	1-3/4"
HT8F8-SS	Plug/Male	1"	1" - 11-1/2 Female NPTF	316 Stainless	3.50" (88.9mm)	1.96" (49.8mm)	1-3/4"
HT8BF8	Plug/Male	1"	1" - 11 Female BSPP	Steel	3.50" (88.9mm)	1.96" (49.8mm)	1-3/4"
HT8BF8-SS	Plug/Male	1"	1" - 11 Female BSPP	316 Stainless	3.50" (88.9mm)	1.96" (49.8mm)	1-3/4"
HT8OF8	Plug/Male	1"	1-5/16" - 12 Female ORB	Steel	3.50" (88.9mm)	1.96" (49.8mm)	1-3/4"
HT8F10	Plug/Male	1"	1-1/4" - 11-1/2 Female NPTF	Steel	3.61" (91.7mm)	2.19" (55.6mm)	2"
HT8F10-SS	Plug/Male	1"	1-1/4" - 11-1/2 Female NPTF	316 Stainless	3.61" (91.7mm)	2.19" (55.6mm)	2"
HT8BF10	Plug/Male	1"	1-1/4" - 11 Female BSPP	Steel	3.55" (90.2mm)	2.19" (55.6mm)	2"
HT8BF10-SS	Plug/Male	1"	1-1/4" - 11 Female BSPP	316 Stainless	3.55" (90.2mm)	2.19" (55.6mm)	2"
HT8OF10	Plug/Male	1"	1-5/8" - 12 Female ORB	Steel	3.51" (89.2mm)	2.19" (55.6mm)	2"

HT-Series \| ISO16028 Flushface Interchange Coupler (Female Threads)

Part Number	Coupling Type	Body Size	Threads	Material	Length	Max. OD	Hex
2HTF2	Socket/Female	1/4"	1/4" - 18 Female NPTF	Steel	1.98" (50.3mm)	1.11" (28.3mm)	7/8"
2HTBF2	Socket/Female	1/4"	1/4" - 19 Female BSPP	Steel	1.98" (50.3mm)	1.11" (28.3mm)	7/8"
2HTOF3	Socket/Female	1/4"	9/16" - 18 Female ORB	Steel	1.98" (50.3mm)	1.11" (28.3mm)	7/8"
3HTF3	Socket/Female	3/8"	3/8" - 18 Female NPTF	Steel	2.50" (63.5mm)	1.24" (31.5mm)	1"
3HTF3-SS	Socket/Female	3/8"	3/8" - 18 Female NPTF	316 Stainless	2.50" (63.5mm)	1.24" (31.5mm)	1"
3HTBF3	Socket/Female	3/8"	3/8" - 19 Female BSPP	Steel	2.50" (63.5mm)	1.24" (31.5mm)	1"
3HTBF3-SS	Socket/Female	3/8"	3/8" - 19 Female BSPP	316 Stainless	2.50" (63.5mm)	1.24" (31.5mm)	1"
3HTOF3	Socket/Female	3/8"	9/16" - 18 Female ORB	Steel	2.50" (63.5mm)	1.24" (31.5mm)	1"
3HTF4	Socket/Female	3/8"	1/2" - 14 Female NPTF	Steel	2.72" (69.1mm)	1.24" (31.5mm)	1-1/8"
3HTF4-SS	Socket/Female	3/8"	1/2" - 14 Female NPTF	316 Stainless	2.72" (69.1mm)	1.24" (31.5mm)	1-1/8"
3HTBF4	Socket/Female	3/8"	1/2" - 14 Female BSPP	Steel	2.72" (69.1mm)	1.24" (31.5mm)	1-1/8"
3HTBF4-SS	Socket/Female	3/8"	1/2" - 14 Female BSPP	316 Stainless	2.72" (69.1mm)	1.24" (31.5mm)	1-1/8"
3HTOF4	Socket/Female	3/8"	3/4" - 16 Female ORB	Steel	2.72" (69.1mm)	1.24" (31.5mm)	1-1/8"
4HTF4	Socket/Female	1/2"	1/2" - 14 Female NPTF	Steel	3.02" (76.7mm)	1.54" (39.1mm)	1-3/16"
4HTF4-SS	Socket/Female	1/2"	1/2" - 14 Female NPTF	316 Stainless	3.02" (76.7mm)	1.54" (39.1mm)	1-3/16"
4HTBF4	Socket/Female	1/2"	1/2" - 14 Female BSPP	Steel	3.02" (76.7mm)	1.54" (39.1mm)	1-3/16"
4HTBF4-SS	Socket/Female	1/2"	1/2" - 14 Female BSPP	316 Stainless	3.02" (76.7mm)	1.54" (39.1mm)	1-3/16"
4HTOF4	Socket/Female	1/2"	3/4" - 16 Female ORB	Steel	3.02" (76.7mm)	1.54" (39.1mm)	1-3/16"
4HTOF5	Socket/Female	1/2"	7/8" - 14 Female ORB	Steel	3.12" (79.2mm)	1.54" (39.1mm)	1-5/16"
4HTF6	Socket/Female	1/2"	3/4" - 14 Female NPTF	Steel	3.22" (81.8mm)	1.54" (39.1mm)	1-5/16"
4HTF6-SS	Socket/Female	1/2"	3/4" - 14 Female NPTF	316 Stainless	3.22" (81.8mm)	1.54" (39.1mm)	1-5/16"
4HTBF6	Socket/Female	1/2"	3/4" - 14 Female BSPP	Steel	3.22" (81.8mm)	1.54" (39.1mm)	1-5/16"
4HTBF6-SS	Socket/Female	1/2"	3/4" - 14 Female BSPP	316 Stainless	3.22" (81.8mm)	1.54" (39.1mm)	1-5/16"
4HTOF6	Socket/Female	1/2"	1-1/16" - 12 Female ORB	Steel	3.42" (86.9mm)	1.54" (39.1mm)	1-5/16"
5HTOF5	Socket/Female	5/8"	7/8" - 14 Female ORB	Steel	3.32" (84.3mm)	1.67" (42.4mm)	1-1/2"
5HTF6	Socket/Female	5/8"	3/4" - 14 Female NPTF	Steel	3.32" (84.3mm)	1.67" (42.4mm)	1-1/2"
5HTF6-SS	Socket/Female	5/8"	3/4" - 14 Female NPTF	316 Stainless	3.32" (84.3mm)	1.67" (42.4mm)	1-1/2"
5HTBF6	Socket/Female	5/8"	3/4" - 14 Female BSPP	Steel	3.32" (84.3mm)	1.67" (42.4mm)	1-1/2"
5HTBF6-SS	Socket/Female	5/8"	3/4" - 14 Female BSPP	316 Stainless	3.32" (84.3mm)	1.67" (42.4mm)	1-1/2"
5HTOF6	Socket/Female	5/8"	1-1/16" - 12 Female ORB	Steel	3.32" (84.3mm)	1.67" (42.4mm)	1-1/2"
6HTOF5	Socket/Female	3/4"	7/8" - 14 Female ORB	Steel	3.70" (94.0mm)	1.85" (47.0mm)	1-1/2"
6HTF6	Socket/Female	3/4"	3/4" - 14 Female NPTF	Steel	3.70" (94.0mm)	1.85" (47.0mm)	1-1/2"
6HTF6-SS	Socket/Female	3/4"	3/4" - 14 Female NPTF	316 Stainless	3.70" (94.0mm)	1.85" (47.0mm)	1-1/2"
6HTBF6	Socket/Female	3/4"	3/4" - 14 Female BSPP	Steel	3.70" (94.0mm)	1.85" (47.0mm)	1-1/2"
6HTBF6-SS	Socket/Female	3/4"	3/4" - 14 Female BSPP	316 stainless	3.70" (94.0mm)	1.85" (47.0mm)	1-1/2"
6HTOF6	Socket/Female	3/4"	1-1/16" - 12 Female ORB	Steel	3.70" (94.0mm)	1.85" (47.0mm)	1-1/2"
6HTF8	Socket/Female	3/4"	1" - 11-1/2 Female NPTF	Steel	3.82" (97.0mm)	1.92" (48.8mm)	1-3/4"
6HTF8-SS	Socket/Female	3/4"	1" - 11-1/2 Female NPTF	316 Stainless	3.82" (97.0mm)	1.92" (48.8mm)	1-3/4"
6HTBF8	Socket/Female	3/4"	1" - 11 Female BSPP	Steel	3.82" (97.0mm)	1.92" (48.8mm)	1-3/4"
6HTBF8-SS	Socket/Female	3/4"	1" - 11 Female BSPP	316 Stainless	3.82" (97.0mm)	1.92" (48.8mm)	1-3/4"
6HTOF8	Socket/Female	3/4"	1-5/16" - 12 Female ORB	Steel	3.82" (97.0mm)	1.92" (48.8mm)	1-3/4"
8HTF8	Socket/Female	1"	1" - 11-1/2 Female NPTF	Steel	4.24" (107.7mm)	2.29" (58.2mm)	1-3/4"
6HTF8	Socket/Female	1"	1" - 11-1/2 Female NPTF	316 Stainless	4.24" (107.7mm)	2.29" (58.2mm)	1-3/4"
8HTBF8	Socket/Female	1"	1" - 11 Female BSPP	Steel	4.24" (107.7mm)	2.29" (58.2mm)	1-3/4"
8HTBF8-SS	Socket/Female	1"	1" - 11 Female BSPP	316 Stainless	4.24" (107.7mm)	2.29" (58.2mm)	1-3/4"
8HTOF8	Socket/Female	1"	1-5/16" - 12 Female ORB	Steel	4.24" (107.7mm)	2.29" (58.2mm)	1-3/4"
8HTF10	Socket/Female	1"	1-1/4" - 11-1/2 Female NPTF	Steel	4.34" (110.2mm)	2.29" (58.2mm)	2"
8HTF10-SS	Socket/Female	1"	1-1/4" - 11-1/2 Female NPTF	316 Stainless	4.34" (110.2mm)	2.29" (58.2mm)	2"
8HTBF10	Socket/Female	1"	1-1/4" - 11 Female BSPP	Steel	4.29" (109.0mm)	2.29" (58.2mm)	2"
8HTBF10-SS	Socket/Female	1"	1-1/4" - 11 Female BSPP	316 Stainless	4.29" (109.0mm)	2.29" (58.2mm)	2"
8HTOF10	Socket/Female	1"	1-5/8" - 12 Female ORB	Steel	4.24" (107.7mm)	2.29" (58.2mm)	2"

HT-Series \| Correct Connect® Bands

Part NumberBlue Part Number	Part NumberOrange Part Number	Part NumberGreen Part Number	Part NumberYellow Part Number	Part NumberRed Part Number	Description	Body Size
2HTBAND-B	2HTBAND-O	2HTBAND-G	2HTBAND-Y	2HTBAND-R	Coupler Band	1/4"
HT2BAND-B	HT2BAND-O	HT2BAND-G	HT2BAND-Y	HT2BAND-R	Plug Band	1/4"

3HTBAND-B	3HTBAND-O	3HTBAND-G	3HTBAND-Y	3HTBAND-R	Coupler Band	3/8"
HT3BAND-B	HT3BAND-O	HT3BAND-G	HT3BAND-Y	HT3BAND-R	Plug Band	3/8"

4HTBAND-B	4HTBAND-O	4HTBAND-G	4HTBAND-Y	4HTBAND-R	Coupler Band	1/2"
HT4BAND-B	HT4BAND-O	HT4BAND-G	HT4BAND-Y	HT4BAND-R	Plug Band	1/2"

5HTBAND-B	5HTBAND-O	5HTBAND-G	5HTBAND-Y	5HTBAND-R	Coupler Band	5/8"
HT5BAND-B	HT5BAND-O	HT5BAND-G	HT5BAND-Y	HT5BAND-R	Plug Band	5/8"

6HTBAND-B	6HTBAND-O	6HTBAND-G	6HTBAND-Y	6HTBAND-R	Coupler Band	3/4"
HT6BAND-B	HT6BAND-O	HT6BAND-G	HT6BAND-Y	HT6BAND-R	Plug Band	3/4"

8HTBAND-B	8HTBAND-O	8HTBAND-G	8HTBAND-Y	8HTBAND-R	Coupler Band	1"
HT8BAND-B	HT8BAND-O	HT8BAND-G	HT8BAND-Y	HT8BAND-R	Plug Band	1"

Dixon Valve & Coupling

Dixon, founded in 1916, is a premier manufacturer and supplier of hose couplings, valves, dry disconnects, swivels, and other fluid transfer and control products. Our global reach includes a wide range of products for numerous industries including petroleum exploration, refining, transportation, chemical processing, food and beverage, steel, fire protection, construction, mining, and manufacturing.

Shop Parts by Dixon Valve & Coupling