304L Double-end studs
ASME B18.31.2ASTM A276
A 304L double-end stud leaves the installed end in the equipment body while the service nut is removed. Its low-carbon austenitic compatibility with fabricated stainless equipment must cover the trapped body-end interface as well as the exposed end.
- MOQ
- 100PCS
- Samples · typical
- ~20 days
- Production · typical
- 25–35 days
- Heat treatment
- Solution annealed
EN 10204 3.1 MTC + heat-number traceability
Which standard is on your order?
Raw Material Specifications
Finished-Stud Specifications
Threads · Metric
Threads · Inch
Dimension Reference
Heat Treatment
Solution annealed; cold worked for strengthened conditionsSolution annealing restores a ductile corrosion-resistant structure, while specified cold work raises strength without precipitation aging.
What we can make in 304L
Clamping stud
Use for through-bolted covers and housings with access to both nuts. The plain grip spans the joint; independently sized threaded ends accommodate unequal nut-side clearances.
Tap-end stud
Use on valve bonnets and machine housings opened repeatedly for maintenance. The insertion end remains in the body while the outer nut is removed, reducing repeated wear of the housing thread.
- Thread systems
- Metric · UNC · UNF · 8UN · UNJ
- Geometry
- Two threaded ends · Plain shank
- Assembly
- Nut-to-nut · Tap-end
- Final condition
- Solution annealed
- Inspection
- End thread lengths · Shank diameter · Thread gauging
Manufacturing route
CNC machining suits samples and special end forms. Repeat lots use cut-to-length stock with rolling or cutting selected for the ordered thread and material condition.
Heat treatment & final condition
The final annealed or specified strengthened condition is linked to the lot; an aging treatment is not assumed for a solid-solution alloy.
Finished geometry
End lengths, runout and effective thread engagement are checked separately from overall length; tap ends are gauged to their own fit requirement.
Where 304L fits — and what matters
Food & Beverage Equipment
Washdown pump housings and removable covers304L double-end studs connect washdown pump housings and removable covers through a threaded body end and an accessible nut end. The plain shank spans the cover grip. Cleaning liquid can remain under the part; exposed finish and access for cleaning matter at the assembled joint.
Water Treatment & Desalination
Filter housings and treatment-pump covers304L double-end studs connect filter housings and treatment-pump covers through a threaded body end and an accessible nut end. The plain shank spans the cover grip. The water stream, cleaning cycle and retained liquid define exposure at the installed part.
Pumps, Valves & OEM
Pump casings and valve bonnets304L double-end studs connect pump casings and valve bonnets through a threaded body end and an accessible nut end. The plain shank spans the cover grip. Repeated maintenance makes fit, engagement and access part of the component specification.
Same double-end stud. Different material priorities.
304L material data316L
Molybdenum-bearing stainless performance in wet equipment.
- Connection priority
- Tension through the grip and load transfer into the housing
- Washdown and retained cleaner
- Cleaner concentration, rinse quality and deposits determine the exposure in covered joints. The low-carbon designation does not independently establish a fastener strength class. Include liquid retained at the body-end thread inside the tapped housing in the exposure description.
17-4 PH
Aging-controlled strength and hardness.
- Connection priority
- Tension through the grip and load transfer into the housing
- H900 versus H1150
- The aging condition changes the balance of strength, hardness and toughness. A replacement part needs the specified H condition, especially where contact wear and shock load occur together.
Inconel 625
Solid-solution strength and resistance to aggressive process liquids.
- Connection priority
- Tension through the grip and load transfer into the housing
- Annealed or solution-annealed 625
- The delivery condition affects strength and high-temperature response. Keep the specified condition with the component’s mechanical acceptance; 718-style aging is not the strengthening route for 625. Include liquid retained at the body-end thread inside the tapped housing in the exposure description.
From drawing to documented delivery
- 01Drawing & BOMForm, dimensions and quantity
- 02Material & formingGrade, heat and manufacturing route
- 03Final inspectionGeometry, threads and ordered tests
- 04Documents & dispatchLot records and identified packing
Order documents
- Material identity
- UNS S30403 · heat number · ordered condition
- Final-part acceptance
- Grade chemistry, supplied condition and ordered mechanical requirements.
- Dimensional record
- End thread lengths · Shank diameter · Thread gauging
- Traceability
- EN 10204 3.1 material certificate · production lot · identified packing
Build your 304L double-end stud enquiry
Questions about 304L double-end studs
Can both ends use the same thread designation?
They can, but the body end may require a different fit or engagement from the nut end. Record each end separately, including a different pitch or interference requirement where the equipment drawing uses one.