GOST 28919 Thick Hex Nuts

GOST 28919 Thick Hex Nuts are used in flange connections for wellhead equipment, where large-diameter studs and nuts work together to secure pressure-containing components. The nut dimensions are designed to provide the required thread engagement and bearing area for these heavy-duty bolted connections.

For wellhead flange assemblies, selecting the correct nut involves more than choosing the thread size. The nut type, nominal diameter, height, material grade, and matching stud all need to correspond with the flange connection. We can supply GOST 28919 nuts in different sizes and steel grades to suit the requirements of the complete fastening assembly. Our manufacturing capabilities include hot forging, machining, and thread processing for large-size nuts. We can produce GOST 28919 nuts according to the required dimensional configuration and provide customized materials, surface treatments, marking, and packaging for industrial projects.

Specification:

GOST 28919 Thick Hex Nuts are manufactured according to the dimensional and technical requirements specified for flange connections of wellhead equipment. The standard defines two nut configurations corresponding to Type 1 and Type 2 flange connections, with nominal thread sizes and key dimensions specified for each configuration.

The nuts are manufactured from bar stock, calibrated stock, forgings, or stampings. Mechanical requirements differ according to the flange connection type: Type 1 nuts require a minimum proof-load stress of 800 MPa with a maximum Brinell hardness of HB 302, while Type 2 nuts require a minimum proof-load stress of 1000 MPa with a maximum Brinell hardness of HB 353. The proof-load stress is verified when selecting the material and heat-treatment condition, with testing carried out according to GOST 1759.5. The internal thread is metric according to GOST 24705 with a 6H tolerance class according to GOST 16093. The thread run-out is specified according to GOST 27148, and a rounded thread-root profile according to GOST 9150 is recommended.

Dimension Chart of GOST 28919 Thick Hex Nuts:

The dimensions of GOST 28919 nuts are matched to the flange connection configuration used in wellhead equipment. The standard includes Type 1 and Type 2 nut configurations, with the nut height, across-flats dimension, thread diameter, and other dimensions defined for each size. When selecting a GOST 28919 nut, the nut type, nominal thread size, mating stud, and corresponding flange configuration should be checked together. This helps ensure that the nut fits correctly within the available space and provides the required thread engagement.

Dimensional Standard: GOST 28919-91
Thread Standard: GOST 24705
Thread Tolerance: 6H according to GOST 16093

For large-size or project-specific requirements, we can manufacture the nuts according to the applicable GOST configuration or customer drawings.