Quick Connectors – Instrument and Full-Flow Quick Couplings
Quick connectors let a technician break and remake a fluid or gas line by hand in seconds. R-LOK supplies two families in 316 stainless steel. The SQC instrument range covers 1/8 in to 1/2 in tube and NPT ports by push-pull, rated 3,000 psig (206 bar) at 70 °F. The SFQC full-flow range uses a ball-lock sleeve and reaches 6,000 psig (413 bar).
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Key features
- SQC connectors to 3,000 psig (206 bar); SFQC to 6,000 psig (413 bar).
- SQC connects by push-pull; SFQC uses a ball-lock sleeve on tube to 1 in.
- SQC comes with or without an integral shut-off valve; spillage 0.3 to 3.0 cm³.
- 316 stainless steel wetted parts with Viton (FKM) O-rings; brass SFQC catalogued.
- Tube ends from 1/8 in to 1 in, plus 6 mm to 25 mm.
- SFQC full-flow bore gives Cv to 45.0 with no orifice inside.
Specifications
| Parameter | Value |
|---|---|
| Series | SQC1, SQC2, SQC3 (instrument) and SFQC2 to SFQC5 (full flow) |
| Body, stem and seal | 316 SS with Viton (FKM) O-ring; brass SFQC with NBR |
| Tube ends | SQC 1/8 in to 1/2 in, SFQC 1/4 in to 1 in, 6-25 mm |
| Threads | NPT 2N to 16N, BSPT 2R to 16R, BSPP 4G to 16G |
| Pressure at 70 °F | SQC 3,000/1,500/750, SFQC 6,000/4,000/2,000 psig (206/103/51.6, 413/275/137 bar) |
| Pressure at 400 °F | 250 psig (17.2 bar) for SQC1, SQC2 and SQC3 |
| Flow and spillage | SQC 4/6/10 US gal/min (15/22/37 L/min), spillage 0.3/1.0/3.0 cm³ |
| Cv and diameter | Cv 0.2 to 3.3 SQC, 1.7 to 45.0 SFQC; body 23.1/26.2/30.7 mm |
Instrument and full-flow families
The SQC series suits instrument lines where a small, light coupling matters more than flow. SQC sizes are SQC1, SQC2 and SQC3, for 1/8 in to 1/2 in tube and 1/4 in to 1/2 in NPT. Cv is 0.2 to 3.3.
The SFQC suits lines that must not be throttled by the coupling. A ball-lock sleeve holds the halves together. Cv reaches 45.0 on the 1 in SFQC5, 26.0 on the 3/4 in SFQC4. Four sizes cover 1/4 in to 1 in tube.
Shut-off, spillage and air inclusion
SQC bodies and stems come in two versions. SO has no valve, so the line is open when the halves are coupled. DO has a shut-off valve that closes on disconnection; Cv on an SQC2P stem falls from 1.5 to 0.5. SFQC has no valve.
Catalogue figures for liquid spillage on disconnection and air inclusion on reconnection are equal for each size: 0.3 cm³ SQC1, 1.0 cm³ SQC2, 3.0 cm³ SQC3. Those numbers matter on analyser and sampling lines where the fluid is expensive or hazardous.
Materials, pressures, ends and codes
SQC wetted parts are 316 stainless steel with Viton (FKM) O-rings; SFQC also comes in brass with an NBR O-ring. At 70 °F, SQC is rated 3,000 psig (206 bar) SQC1, 1,500 psig (103 bar) SQC2, 750 psig (51.6 bar) SQC3.
End styles: S ferrule tube adapter, M male pipe thread, F female pipe thread. NPT is standard; BSPT and BSPP ends carry separate codes. An SQC2P-S6-DO-SS stem takes a 3/8 in ferrule tube end with a shut-off valve in 316 stainless steel.
Standards referenced: 316 SS barstock to ASTM A479 / A276; 304 SS spring wire to ASTM A313; NPT threads per ASME B1.20.1; BSPT per ISO 7-1, BSPP per ISO 228-1; Catalogue working pressures are not ASME B31.3 design ratings.
Typical duties: Analyser and process sampling systems; Instrument air and pneumatic signal lines; Hydraulic test and calibration benches; Gas panels and cylinder change-out points; Chemical injection and wellhead skids; Pharmaceutical lines needing low-spill change-out.
Quick connector model selection guide
| Series / model | Size | Connection | Working pressure | Body material | Seat / packing | Cv | Notes |
|---|---|---|---|---|---|---|---|
| SQC1P-SO / SQC1P-DO | 1/8 in. and 1/4 in. tube | Tube fitting 1/8 in. or 1/4 in. | 3000 psig (206 bar) at 70 degF (20 degC) | 316 stainless steel | Viton O-ring | 0.4 | Stem; SO = without integral check valve, DO = with integral check valve |
| SQC1P-SO / SQC1P-DO (6M, M2N) | 6 mm tube; 1/8 NPT | Tube fitting 6 mm; 1/8 NPT male | 3000 psig (206 bar) at 70 degF (20 degC) | 316 stainless steel | Viton O-ring | 0.2 | Stem; 1/8 NPT female (F2N) also offered in this Cv group |
| SQC1P-SO / SQC1P-DO (M4N, F4N) | 1/4 NPT | 1/4 NPT male; 1/4 NPT female | 3000 psig (206 bar) at 70 degF (20 degC) | 316 stainless steel | Viton O-ring | 0.4 | Stem; catalogue derates SQC1 to 250 psig (17.2 bar) at 400 degF (204 degC) |
| SQC1B-SO / SQC1B-DO | 1/8 in. to 1/4 in. tube; 6 mm tube | Tube fitting S2, S4, S6M; NPT threads M2N, M4N(R), F2N, F4N(R) | 3000 psig (206 bar) at 70 degF (20 degC) | 316 stainless steel | Viton O-ring | not published | Body; overall length A 51.1-69.8 mm, D 23.1 mm; BP / PP protective caps offered |
| SQC2P-SO / SQC2P-DO (S6, S10M) | 3/8 in. and 10 mm tube | Tube fitting 3/8 in. or 10 mm | 3000 psig (206 bar) at 70 degF (20 degC) | 316 stainless steel | Viton O-ring | 1.5 | Stem; SO = without integral check valve, DO = with integral check valve |
| SQC2P-SO / SQC2P-DO (M4N, M6N(R)) | 1/4 NPT and 3/8 NPT | 1/4 NPT male; 3/8 NPT male (PT male) | 3000 psig (206 bar) at 70 degF (20 degC) | 316 stainless steel | Viton O-ring | 1.6 | Stem; F4N and F6N(R) female ports are listed in the same group |
| SQC2B-SO / SQC2B-DO (M4N, M6N(R)) | 1/4 NPT and 3/8 NPT | 1/4 NPT male (PT male); 3/8 NPT male (PT male) | 3000 psig (206 bar) at 70 degF (20 degC) | 316 stainless steel | Viton O-ring | not published | Body; overall length A 60.5 mm, D 26.2 mm; F4N 64.5 mm and F6N(R) 65.3 mm |
| SQC2B-SO / SQC2B-DO (S6, S10M, F4N, F6N(R)) | 3/8 in. and 10 mm tube; 1/4 and 3/8 NPT | Tube fitting 3/8 in. or 10 mm; 1/4 NPT female; 3/8 NPT female (PT female) | 3000 psig (206 bar) at 70 degF (20 degC) | 316 stainless steel | Viton O-ring | not published | Body; protective caps SQC2-BP and SQC2-PP offered |
| SQC3P-SO / SQC3P-DO | 1/2 in. and 12 mm tube; 1/2 NPT | Tube fitting 1/2 in. or 12 mm; 1/2 NPT male (PT male); 1/2 NPT female (PT female) | 3000 psig (206 bar) at 70 degF (20 degC) | 316 stainless steel | Viton O-ring | 3.3 | Stem (S8, S12M) Cv 3.3; 1/2 NPT thread group (M8N(R), F8N(R)) Cv 3.1; 400 degF (204 degC) rating not published |
| SQC3B-SO / SQC3B-DO | 1/2 in. and 12 mm tube; 1/2 NPT | Tube fitting S8, S12M; 1/2 NPT male M8N(R); 1/2 NPT female F8N(R) | 3000 psig (206 bar) at 70 degF (20 degC) | 316 stainless steel | Viton O-ring | not published | Body; overall length A 76.1-78.5 mm, D 30.7 mm; BP / PP protective caps offered |
| SFQC2P | 1/4 in. to 3/8 in. tube; 1/4 to 3/8 NPT | S4, S6 tube fitting; M4N(R), M6N(R), F4N(R), F6N(R) NPT; M4G, F4G BSPP | 6000 psig (413 bar) at 70 degF (20 degC) | 316 stainless steel / A479 | Viton O-ring (FKM) | 2.2 to 2.8 | Stem; port 4.8-6.1 mm; Cv 2.2 (S4, M4G), 2.8 (S6, M6N(R), F6N(R)), 1.7 (thread group M4N(R), F4N(R), F4G); 400 degF (204 degC) rating not published |
| SFQC3P | 3/8 in. to 1/2 in. tube; 1/4 to 1/2 NPT | S6, S8 tube fitting; M6N(R), M8N(R), F6N(R), F8N(R) NPT; M8G, F8G BSPP | 6000 psig (413 bar) at 70 degF (20 degC) | 316 stainless steel / A479 | Viton O-ring (FKM) | 2.9 to 13.0 | Stem; port 7.1-12.7 mm; 3000 psig (206 bar) at 250 degF (121 degC), 100 psig (6.8 bar) at 400 degF (204 degC) |
| SFQC4P | 3/4 in. and 1/2 in. tube; 3/4 NPT | S8, S12 tube fitting; M12N(R), F12N(R) 3/4 NPT | 6000 psig (413 bar) at 70 degF (20 degC) | 316 stainless steel / A479 | Viton O-ring (FKM) | 13.0 to 26.0 | Stem; port 10.4-15.7 mm; 3000 psig (206 bar) at 250 degF (121 degC), 100 psig (6.8 bar) at 400 degF (204 degC) |
| SFQC5P | 1 in. tube; 1 NPT | S16 tube fitting; M16N(R), F16N(R) 1 NPT | 6000 psig (413 bar) at 70 degF (20 degC) | 316 stainless steel / A479 | Viton O-ring (FKM) | 39.0 to 45.0 | Stem; port 22.4 mm; 3000 psig (206 bar) at 250 degF (121 degC), 100 psig (6.8 bar) at 400 degF (204 degC) |
| SFQC2B-SO / SFQC2B-DO | 1/4 in. to 3/8 in. tube; 1/4 to 3/8 NPT | S4, S6 tube fitting; M4N(R), M6N(R), F4N(R), F6N(R) NPT; M4G, F4G BSPP | 4000 psig (275 bar) at 70 degF (20 degC) | Brass | NBR O-ring | not published | Body; minimum bore 4.8-9.7 mm; pressure rating is the brass value, 400 degF (204 degC) rating not published |
| SFQC3B-SO / SFQC3B-DO | 3/8 in. to 1/2 in. tube; 3/8 to 1/2 NPT | S6, S8 tube fitting; M6N(R), M8N(R), F6N(R), F8N(R) NPT; M8G, F8G BSPP | 4000 psig (275 bar) at 70 degF (20 degC) | Brass | NBR O-ring | not published | Body; minimum bore 7.1-16.0 mm; 3000 psig (206 bar) at 250 degF (121 degC), 100 psig (6.8 bar) at 400 degF (204 degC) |
Selection notes: Source: SQC and SFQC series pages of the instrument quick connector section, catalogue footers 14-01 to 14-08. Working pressure is the catalogue pressure/temperature table value at 70 degF (20 degC) on the stated temperature basis; the table also lists 250 degF (121 degC) and 400 degF (204 degC) columns.
Catalogue reference 14-01, 14-02, 14-03, 14-04, 14-05, 14-06, 14-07, 14-08. Confirm the final rating against the data sheet issued with your order.
See also: Filters · Fluid Control Accessories · Hoses Hose Fittings
Frequently asked questions
What is the minimum order quantity and lead time?
Connectors are quoted by model code, so the MOQ depends on the number of codes ordered and whether the ends are standard NPT or BSPT and BSPP variants. Send the full codes and quantities, and we confirm the MOQ, ship date and port of loading.
What documents come with a shipment?
The packing list states the model code, end connection, size and material for every line. Material certificates and dimensional inspection reports come with the shipment when they are requested in the purchase order, and every shipment is confirmed in writing before it leaves Changsha.
Should I order the SO or the DO version?
Choose SO when a valve elsewhere already isolates the line and you want the highest Cv; an SQC2P stem gives 1.5 in SO against 0.5 in DO. Choose DO when the upstream half must seal on disconnection, at a cylinder or sampling bottle.
Request a quote or technical clarification
Send us the model, size, material and quantity you need — or a photo of the existing part. We reply with a quotation, availability and the applicable documents, usually within one working day.
Tel / WhatsApp: +86 136 5741 6007 · Email: nimo@runda-hitech.com