PPG Semco 220546 Fine-Orifice Sealant Gun Nozzle – 1/16 Inch for Precision Bead Application
The PPG Semco 220546 polyethylene nozzle for the Semco Model 440 gun features a precision 1/16 inch orifice that delivers a fine, narrow sealant bead for applications requiring precise sealant placement in tight joints, small-cross-section fillets, and fastener head sealing where a larger bead would be messy and wasteful. The fine orifice provides the technician with maximum control over sealant bead size and placement.
The 1/16 inch orifice is the smallest standard orifice in the Semco Model 440 nozzle range, making it the ideal choice for detail sealing work, fastener wet installation, and precision fillet sealing in areas where excess sealant application must be minimized. The fine bead also reduces sealant consumption per linear foot of joint compared to larger-orifice nozzles, providing material savings on high-volume applications.
Like all Semco Model 440 nozzles, the 220546 uses 1/4 NPT male thread for positive connection to the Model 440 gun body. The disposable polyethylene design eliminates nozzle cleaning between applications, reducing labor and solvent consumption in sealant application operations.
| Attribute | Detail |
|---|---|
| Manufacturer Part Number (MPN) | 220546 |
| Brand | PPG Semco |
| Compatible Gun | Semco Model 440 |
| Material | Polyethylene |
| Orifice Diameter | 1/16 inch (Fine Bead) |
| Length | 4 inches |
| Thread Connection | 1/4 NPT Male |
| Product Type | Sealant Gun Nozzle — Disposable |
| Sealant Compatibility | Polysulfide, Polythioether Aerospace Sealants |
| Industry Use | Commercial Aviation, Military, MRO Precision Sealing |
Technical Information
The 1/16 inch orifice of the 220546 nozzle produces a sealant bead approximately half the diameter of the standard 1/8 inch orifice nozzle (220550), resulting in a sealant bead of approximately 1/16 inch diameter when extruded at normal gun pressure. This fine bead is suitable for fastener head sealing, rivet sealing, and narrow fillet applications where the joint geometry requires a small, precisely placed sealant bead.
The polyethylene nozzle body is designed to withstand the extrusion pressure generated by the Semco Model 440 gun without deformation or cracking at ambient operating temperatures. The nozzle tip can be carefully bent to a slight angle without cracking, allowing the fine-orifice tip to be directed into difficult-to-reach locations without requiring repositioning of the entire gun body.
For applications where the 1/16 inch orifice is too fine for the required joint and the 1/8 inch orifice is too coarse, intermediate orifice sizes may be available in the Semco nozzle range. Consult the Semco nozzle selection guide or PPG technical representative for guidance on selecting the optimal nozzle orifice size for your specific sealing application geometry.
Why Choose Semco 220546 Fine Nozzle?
- ✅ 1/16 Inch Fine Orifice — Maximum precision for tight joints and detail sealing
- ✅ Reduces Sealant Waste — Fine bead uses less material per joint
- ✅ Disposable Design — No cleaning required between applications
- ✅ Model 440 Compatible — Fits Semco aerospace standard gun system
- ✅ 4 Inch Reach — Access confined and recessed joint locations
Applications and Compatible Aircraft
Semco 220546 fine-orifice nozzles are used for fastener wet installation sealing, rivet head sealing, fine fillet sealing, and precision injection sealing in aircraft fuel tanks and structural assemblies on all commercial and military aircraft types.
Frequently Asked Questions
Q: What is the orifice size of Semco 220546?
A: The 220546 nozzle has a 1/16 inch orifice — the finest standard orifice in the Semco Model 440 range, producing a narrow, precise sealant bead.
Q: When should I use a 1/16 inch nozzle instead of 1/8 inch?
A: Use the 1/16 inch (220546) nozzle when applying sealant to fastener heads, rivet holes, narrow fillets, and tight joints where a large bead would result in excess sealant squeeze-out or contamination of adjacent surfaces.
Q: Is Semco 220546 compatible with Model 440 guns?
A: Yes. The 220546 nozzle is specifically designed for the Semco Model 440 sealant gun using 1/4 NPT male thread connection.
Q: What is the MPN for Semco 1/16 orifice Model 440 nozzle?
A: MPN is 220546.
Q: How many nozzles should I stock for a sealant job?
A: For production operations, stock enough nozzles to replace each nozzle when the sealant in the gun expires. Nozzles are disposable and should not be cleaned and reused after the sealant has cured in them.
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