Is the Straight bulkhead fitting with GZ NPT for metric pipe, stainless steel, M774LM compatible with AISI 316 tubing of various wall thicknesses and OD ranges?

Yes. Straight bulkhead fitting with GZ NPT for metric pipe, stainless steel, M774LM is compatible with AISI 316 tubing across various outer diameters and wall thicknesses, provided the tubing dimensions fall within the allowable OD and wall-thickness ranges specified for the fitting. The fitting is specifically designed for metric tubing and is manufactured from AISI 316 stainless steel, matching the tube material. Allowable working pressure and suitability depend on the tubeâs outer diameter and wall thickness (see the detailed pressure ratings in the attachment). To ensure full compatibility, confirm that the specific AISI 316 tube OD and wall thickness you intend to use are listed in the attachmentâs table; if they are, the M774LM fitting is suitable.

Can Straight bulkhead fitting with GZ NPT for metric pipe, stainless steel, M774LM be used at specified working pressures for different tubing OD and wall thicknesses?

Yes. Straight bulkhead fitting with GZ NPT for metric pipe, stainless steel, M774LM can be used at the specified allowable working pressures provided the tubing outer diameter (OD) and wall thickness meet the limits given in the attachment. The LET-LOKÂ® straight bulkhead with external NPT for metric tubing is designed for chemical, petrochemical, pharmaceutical, energy, nuclear and process industries; allowable pressure is specified per OD and wall thickness and must be verified against those tables. Use AISI 316 tubing and ensure installation follows manufacturer torque and sealing instructions. If your tubing dimensions match the listed combinations, the fitting is suitable for the corresponding working pressure; if not, select a different fitting or tubing thickness.

Does the Straight bulkhead fitting with GZ NPT for metric pipe, stainless steel, M774LM require special installation tools for AISI 316 tubing?

Straight bulkhead fitting with GZ NPT for metric pipe, stainless steel, M774LM does not explicitly require special installation tools beyond standard fittings practice for AISI 316 tubing. The LET-LOKÂ® style bulkhead fitting is designed for use with metric tubing and AISI 316 material; proper installation normally involves cutting and deburring the tube, ensuring correct wall thickness and outer diameter per the allowable working pressure chart, inserting the tube into the fitting, and tightening the nut to the specified torque to compress the ferrule(s). For AISI 316 stainless steel you should: - Use clean, sharp tubing cutters or a precision saw to avoid work hardening or distortion. - Deburr and chamfer the tube end to the recommended dimensions. - Use spanners/wrenches sized to the fitting hex dimensions to achieve the proper assembly torque (follow manufacturer torque recommendations if provided). - If required by system specifications, use a torque wrench for repeatable, controlled tightening. No proprietary or specialized tools (like hydraulic presses or special fixtures) are indicated as mandatory for M774LM; standard hand tools and proper technique suffice. If the tubing is very thin-walled, you may need supports or backup tools to prevent deformation during tightening. Always follow the manufacturerâs assembly instructions and observe the allowable working pressure limits based on tube OD and wall thickness.

Fitting bulkhead straight with NPT male thread for a metric tube, steel stainless, M774LM

All products, LET-LOK precision connectors/

Additional information

Material	SS – stainless steel

Fitting bulkhead straight type LET-LOK® with a thread external NPT for a metric tube intended mainly for the chemical, petrochemical and pharmaceutical industry, power generation, nuclear power plants and process engineering. The permissible working pressure is determined on the basis of the outer diameter and the wall thickness of the tube (details in the attachment). Material: steel AISI 316.

List of product variants

Article number	Product variant name	DN	BAR	Availability	Actions
HM-LM774LM-06-02-SS	Fitting bulkhead for a tube 6 mm, 1/8" NPT male, SS	-	-	In stock	Enquiry
HM-LM774LM-06-04-SS	Fitting bulkhead for a tube 6 mm, 1/4" NPT male, SS	-	-	In stock	Enquiry
HM-LM774LM-08-04-SS	Fitting bulkhead for a tube 8 mm, 1/4" NPT male, SS	-	-	In stock	Enquiry
HM-LM774LM-10-04-SS	Fitting bulkhead for a tube 10 mm, 1/4" NPT male, SS	-	-	In stock	Enquiry
HM-LM774LM-12-04-SS	Fitting bulkhead for a tube 12 mm, 1/4" NPT male, SS	-	-	In stock	Enquiry
HM-LM774LM-12-06-SS	Fitting bulkhead for a tube 12 mm, 3/8" NPT male, SS	-	-	In stock	Enquiry
HM-LM774LM-12-08-SS	Fitting bulkhead for a tube 12 mm, 1/2" NPT male, SS	-	-	In stock	Enquiry

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Fitting bulkhead straight type LET-LOK® with a thread external NPT for a metric tube intended mainly for the chemical, petrochemical and pharmaceutical industry, power generation, nuclear power plants and process engineering. The permissible working pressure is determined on the basis of the outer diameter and the wall thickness of the tube (details in the attachment). Material: steel AISI 316.