Material: 304 stainless steel grade F2 lock type handheld weight 25kg

Material: 304 stainless steel grade F2 lock type handheld weight 25kgproduction process

1Material preparation and pretreatment

choice304or316Stainless steel material.

conductVODRefine and forge square billets.

Solid solution treatment（1050-1100℃ water cooling).

2Rough machining

Saw the steel ingot to the required length.

Rough milling removes edges and corners, and marks the machining line.

Preliminary drilling by drilling machine (Φ)80Adjust the bottom hole of the cavity, Φ50Temporary lifting hole).

3CNC precision machining

Boring and milling adjust the cavity hole to Φ100.

Milling concave surface to Φ130H11.

Processing bottom concave hole with a diameter of Φ84.

Boring“E”Towards the hole to Φ60H9.

Drilling and tappingM24TheM12Wait for the threaded bottom hole.

4Surface treatment

Grind six sides to surface roughnessRa1.6.

Matte processing to 'matte'2B”Effect.

Ultrasonic cleaning to remove oil stains.

Chemical passivation enhances corrosion resistance.

5Calibration and Quality Inspection

Constant temperature laboratory static placement48Hour balance.

useE1Calibrate the balance toF2Grade standards.

Verify hole tolerance using a coordinate measuring instrument.

Magnetic susceptibility detection ensures ≤25MT.

Check the surface quality for scratches and dents.

6Identification and packaging

Laser engraving of weight value, serial number, production date, and grade identification.

Apply rust proof oil or wrap rust proof paper.

Special packaging box lined with shock-absorbing material.

7Finished product warehousing and shipping

After passing the finished product inspection, it will be stored in the warehouse.

Ship according to order requirements.

Acceptance and testing methods‌

1Arrival Inspection Checklist‌

Appearance: No scratches or rust spots, no shaking of the locking mechanism

Identification: Clearly engraved with grade, nominal value, and factory number

Accessories: Special tweezers, storage box, dust cover

2、performance test‌

‌Magnetic testing‌Measure with a magnetometer, residual magnetism ≤0.05mT

‌comparison test‌Verify the error using a verified and qualified balance (such asE2Grade weight used0.01mgBalance testing)

Material: 304 stainless steel grade F2 lock type handheld weight 25kgMaintenance and Periodic Verification‌

1Daily maintenance‌

Cleaning: Use ethanol cotton to wipe unidirectionally (do not rotate or rub)

Storage: Constant temperature and humidity cabinet (temperature)20±1℃, humidity50±5%RH）

2Verification cycle‌

F2/M1Level:1year

Immediate re examination is required in case of falling or suspected contamination