Nut for Use with Spring

 

1.Preparation before installation

(1)Tools and materials

Essential tools:

Torque wrench (range 20-50 Nm)

Hose cutter (ensure that the incision is flat and free of burrs)

Hose deburring tool or fine sandpaper

Cleaning cloth (without fiber shedding)

Auxiliary materials:

High temperature silicone grease (such as Permatex 80078)

Air pressure testing equipment (pressure ≥ 300 psi)

(2)Check the components

Nuts and springs:

Confirm that the brass nut is scratch free and the thread is intact.

Check the free height of the spring (if it is shortened by more than 10% compared to the new part, it needs to be replaced).

Hoses and fittings:

The hose has no aging cracks, and the joint cone surface is smooth without defects.

 

2.Detailed installation steps

Step 1: Pre treatment of hoses

Cutting hoses:

Use a specialized hose cutter to cut vertically to the desired length, with a cutting deviation of less than 0.5 mm.

Do not use ordinary blades to avoid burrs or slopes that may cause seal failure.

Deburring and Cleaning:

Use deburring tools or 400 grit sandpaper to polish the inner and outer edges of the incision to ensure smoothness.

Wipe the inner and outer walls of the hose with a cleaning cloth to remove debris and oil stains.

Step 2: Spring pre installation

Spring positioning:

Insert the stainless steel spring into the annular groove at the bottom of the nut, ensuring that the spring fully fits the groove bottom.

Pay attention to the direction of the spring: The spiral spring should maintain its natural extension direction, and the corrugated surface of the wave spring should face outward.

Lubrication treatment:

Apply a thin layer of silicone grease on the contact surface between the spring and the groove to reduce friction loss.

Step 3: Assembly of hoses and fittings

Insert connector:

Insert the hose into the joint to the marked depth (usually 1.5 times the length of the joint, such as 12 mm).

Prohibit excessive insertion: Avoid deformation of the laminated structure inside the hose.

Pre tightened nut:

Manually tighten the nut to the initial compression state of the spring (compression amount of about 1-2 mm), ensuring that the conical surface contacts.

Step 4: Torque tightening

Set torque value:

Select the standard torque based on the thread specification (e.g. M22 × 1.5 thread is 28 ± 2 Nm).

Prohibit excessive torque: Brass material is relatively soft, excessive tightening can cause deformation of the cone surface or thread slippage.

Tighten in stages:

Phase 1: Tighten to 50% of the recommended torque (14 Nm) to ensure component alignment.

Phase 2: Slowly increase to 100% torque (28 Nm), keeping the wrench perpendicular to the nut plane.

Step 5: Sealing Verification

Air pressure test:

Apply 1.5 times the working pressure to the pipeline (if the standard pressure is 200 psi, test at 300 psi).

Maintain pressure for 3 minutes, and a pressure drop of less than 5% is considered qualified.

Leakage detection:

Apply soapy water to the connection between the nut and the joint, and observe if any bubbles are generated.

Key inspection points: contact area on the cone surface and around the spring groove.

 

Part#	Hose I.D	THREAD	PARKER	MAF	GATES	DIXON
1233-6	3/8	31/32-20	61RBSG-6	38312	G33061-0006	61RBSG-06
1233-8	1/2	1-3/32-20	61RBSG-8	38313	G33061-0008	61RBSG-08

 

Part#	Hose I.D	Tectran	Automann	Fleet Pride	Tramec Sloan	Haldex
1233-6	3/8	1023	177.16956	RB61SG-6	S361ABS-6	11910
1233-8	1/2	1023-8	177.16958		S361ABS-8

 

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