What is the purpose of the Stainless steel pressure sleeve, type FM in the nut for metric pipe fittings?

The purpose of the Stainless steel pressure sleeve, type FM in the nut for metric pipe fittings is to ensure correct compression of the metric pipe against the fitting (coupling). Placed inside the nut, the Stainless steel pressure sleeve, type FM centers and supports the pipe end, distributes the compression force evenly and prevents pipe deformation or leakage when the nut is tightened. Made of AISI 316 stainless steel, it provides corrosion resistance and long-term mechanical stability in demanding environments.

How does the Stainless steel pressure sleeve, type FM ensure a secure seal between metric pipe and coupling?

The Stainless steel pressure sleeve, type FM sits inside the coupling nut and surrounds the metric pipe. When the nut is tightened onto the fitting, the sleeve transmits the compressive force evenly around the pipeâs outer diameter, concentrating the clamp load where the pipe meets the fitting. Made of AISI 316 stainless steel, the sleeve resists deformation and maintains its shape under load and corrosive conditions, ensuring consistent radial pressure and a durable metal-to-metal contact. This controlled compression creates a tight mechanical seal between pipe and coupling, prevents leaks and pipe pull-out, and preserves seal integrity over time and temperature fluctuations.

How do I install the Stainless steel pressure sleeve, type FM into the nut for metric pipe couplings?

Stainless steel pressure sleeve, type FM is installed into the nut of a metric pipe coupling to ensure correct compression of the pipe to the fitting. Follow these steps: 1. Inspect parts: confirm Stainless steel pressure sleeve, type FM, nut and fitting are clean and undamaged. Verify sleeve material AISI 316 matches system requirements. 2. Prepare pipe: cut pipe square, deburr ID and OD, remove sharp edges and foreign matter. Check pipe meets dimensional tolerances for metric coupling. 3. Position sleeve: slide the nut onto the pipe with the threads facing the fitting. Insert the Stainless steel pressure sleeve, type FM into the nut bore. the smaller/angled end (if present) should face the pipe end so the sleeve sits concentric inside the nut. 4. Assemble onto fitting: push the pipe fully into the fitting until it bottoms. Slide the nut with the pre-installed Stainless steel pressure sleeve, type FM forward so the sleeve engages the fitting end and the pipe. 5. Hand-tighten: start threading the nut onto the fitting by hand to ensure correct alignment and that the sleeve remains seated inside the nut and around the pipe. 6. Final tightening: using the recommended wrench, tighten the nut to the manufacturerâs specified torque or number of turns past finger-tight (if specified). Tighten evenly to compress the Stainless steel pressure sleeve, type FM so it forms a secure seal and mechanical grip between the pipe and fitting. 7. Inspect and test: visually confirm the sleeve is fully compressed and nut threads are engaged. Perform pressure or leak test per system requirements. Notes: do not reuse sleeves; replace if deformed. If manufacturer provides specific torque values or assembly instructions, follow those in preference to general procedure.

Stainless steel pressure sleeve, type FM

Additional information

Material	SS – stainless steel

Pressure sleeve, type FM, placed in the nut, allows for proper compression of the metric pipe to the fitting (coupling). Material: AISI 316 steel.

List of product variants

Article number	Product variant name	DN	BAR	Availability	Actions
HJ-FM-06-SS	6 mm bushing, AISI 316	6	-	In stock	Enquiry
HJ-FM-08-SS	8 mm bushing, AISI 316	8	-	In stock	Enquiry
HJ-FM-10-SS	10 mm bushing, AISI 316	10	-	In stock	Enquiry
HJ-FM-12-SS	12 mm bushing, AISI 316	12	-	In stock	Enquiry
HJ-FM-14-SS	14 mm bushing, AISI 316	14	-	In stock	Enquiry
HJ-FM-15-SS	15 mm bushing, AISI 316	16	-	In stock	Enquiry
HJ-FM-16-SS	16 mm bushing, AISI 316	16	-	In stock	Enquiry
HJ-FM-18-SS	18 mm bushing, AISI 316	18	-	In stock	Enquiry
HJ-FM-20-SS	20 mm bushing, AISI 316	20	-	In stock	Enquiry
HJ-FM-25-SS	25 mm sleeve, AISI 316	25	-	In stock	Enquiry
HJ-FM-30-SS	30 mm sleeve, AISI 316	30	-	In stock	Enquiry
HJ-FM-32-SS	32 mm bushing, AISI 316	32	-	In stock	Enquiry
HJ-FM-38-SS	38 mm sleeve, AISI 316	38	-	In stock	Enquiry