Applications | Xin Rui Da Fasteners
30 years of experience solving loosening, leakage and failure challenges in the most demanding bolted joints.
泵阀与流体设备
Pump casing flanges, valve covers, line flanges and base anchors: DIN975/976 studs with DIN934 nuts for easy teardown, in 8.8/10.9 carbon or A2/A4 stainless by medium; matched-grade sets stop the internal thread failing first, and overhaul kits are bagged to BOM for one-container completeness.
- Studs and nuts paired by grade (8.8 with grade 8)
- 304/A2 for humid rooms, 316/A4 for coastal stations
- Flange hardware preferred on casings: large stable face, low torque scatter
- M6-M24 torque chart shipped with the goods
- Spare SKUs consolidated from 500 pcs
船舶与海洋工程
Seawater lines, deck machinery and port structures sit in chloride-rich air where 304 pits through - select 316/A4 on the PREN boundary (24-26 vs 18-20), protect carbon steel with hydrogen-free Dacromet or hot-dip, and run anti-seize at critical joints against crevice attack and galling.
- 316 sits one full environment class above 304 against chlorides
- Dacromet takes up no hydrogen - the high-strength default
- Oxygen-starved crevices cannot re-passivate: isolate with anti-seize
- Stainless still ships with VCI + desiccant sea protection
- Salt-spray and coating-thickness reports in every document set
化工与石化装置
Reactors, exchangers, towers and pipe racks: complete ASTM A193 B7 + A194 2H inch stud sets for general duty, 35CrMo double-ends for metric flanges, and B7M/2HM with 100% hardness inspection for sour (H2S) service - heat-number records shipped with every batch for acceptance and turnaround.
- Closed ASME B16.5 + ASTM inch-system supply
- B7M hardness capped at 235 HB against SSC (NACE MR0175)
- Free stud-length and quantity lists from your flange data
- Mill certificates trace to heat number
- Teflon/zinc finishes applied to spec - no field re-plating
电力与能源装备
Stations, transmission and renewables: hot-dip high-strength bolts for towers and gantries (1000 h+ NSS), class-matched studs for hot steam-side flanges, 10.9 assemblies with torque/preload control at wind towers and foundation rings, 304/A2 inland and 316/A4 coastal PV - and all-metal locking where stations run above 120°C.
- HDG 1000 h+ for desert and coastal atmospheres
- One grade, one batch per joint - no mixed-grade chain failures
- Zoned locking: DIN985 ≤120°C, DIN980 to 300°C+
- Torque chart and re-torque practice handed over to crews
- EPC consolidation with delivery by work package
食品与制药设备
Filling lines, mixers and CIP circuits take daily water and detergent washes: 304/A2 covers ordinary inland plants, 316/A4 serves coastal rooms and chlorine sanitizers, with electro-polished or passivated surfaces on request and tool segregation to keep foreign rust off the equipment.
- A2/A4 stainless for humid wash-down duty
- Step to 316 by the PREN boundary with chlorine sanitizers
- Smooth finishes available to shed soil and chlorides
- Anti-seize on critical re-assemblies against galling
- Batch test reports in the document set for audits
矿山与冶金设备
Screens, crushers and conveyors shake constantly: 10.9 bolts with serrated-flange or all-metal locking under managed preload hold the joint against transverse slip; dusty slurry service calls HDG or Dacromet protection - and broken parts come back to us for a free fracture read within about a week.
- 10.9 permits the higher clamp load that beats micro-movement fatigue
- Above 120°C go all-metal DIN980, never nylon
- Plated 10.9+ batches include the 190-220°C de-embrittlement bake
- ISO 9227 hours written into the contract for acceptance
- Free failure analysis with corrective recommendations
石油与天然气
Wellheads, Christmas trees and high-pressure manifolds: B7/2H inch stud sets as standard, B7M/2HM with 100% hardness control for sour gas per NACE practice, A320 L7 for low temperature; desert stations wear Dacromet or hot-dip finishes, with heat-number certificates and third-party reports clearing customs and project acceptance.
- Complete ASTM-system sets with full records
- Hardness ceiling blocks sulfide stress cracking
- Dacromet 500-1000 h+, hydrogen-free, desert-strong
- Free bolting lists from the flange pressure class
- CO and document sets ready for clearance
通用机械与钢结构装配
Machine frames, drive parts, curtain wall and solar trackers, racking, factory steelwork and vehicle lines: stocked DIN sizes plus drawings-built customs from M4-M100 (inch included), one DIN/GB/ISO/ANSI cross-reference chart, grade-matched HDG or Dacromet steelwork hardware, and distributor labelling and repacking programs.
- Stocked standards + 15-25 day customs, complete in one basket
- One chart reconciles mixed standard systems
- Locking selected by vibration and temperature zone
- Legacy 19 mm and new 18 mm across-flats both producible
- Mixed containers, barcodes and private-label packing supported
Specified for the joint, not picked from a catalogue
- Start from load, media, temperature and service environment
- Match class, finish, size and length, and tightening torque
- Cut the cost of rust, back-off and fracture — rework and downtime
Pump & Valve Fasteners | Casing Studs, DIN975 Double-Ends and Overhaul Spare Kits
Fastening for pump casing flanges, valve covers, line flanges and base anchors: DIN975/976 studs with DIN934 nuts for easy teardown, 8.8/10.9 carbon steel or A2/A4 stainless by medium and environment; bolts + nuts + washers kitted in one container to cut site shortages and grade mixing.
Marine & Offshore Fasteners | 316/A4 Stainless and Heavy-Duty Dacromet
Fasteners for ships, seawater lines, deck machinery and port facilities: 316/A4 stainless against marine-atmosphere chloride pitting (PREN 24-26, a full environment class above 304), plus Dacromet (500-1000 h+, hydrogen-free) or hot-dip (1000 h+) carbon steel, with crevice-corrosion and contamination-control guidance.
Chemical & Petrochemical Fasteners | ASTM A193 B7/2H Studs and NACE Sour Service
Bolting for reactors, exchangers, towers and pipe flanges: complete A193 B7 + A194 2H inch stud sets, sour-service B7M + 2HM (max 235 HB, 100% hardness inspected), B16 for the 540°C class and A320 L7 for -101°C service - every batch traceable to heat number with heat-treatment records for acceptance and turnaround lookup.
Power & Energy Fasteners | Wind Tower Bolts, Solar Mounting Hardware & Transmission Towers
Bolting across thermal, wind, solar and transmission: class-matched studs for hot steam-side flanges, 10.9 bolt assemblies with torque/preload control for wind towers and foundation rings, 304/A2 for inland PV and 316/A4 for coastal or salt-lake plants, hot-dip high-strength hardware (1000 h+ NSS) for towers, and all-metal locking at vibrating hot stations.
Food & Pharma Equipment Fasteners | 304/316 Stainless for Wash-down and Contamination Control
Filling lines, mixers, CIP circuits and hygienic clamping: 304/316 stainless socket screws and flange nuts that survive wash-down and detergents; electro-polishing or passivation on request to shed soil, with crevice-corrosion and carbon-contamination control guidance and batch reports to support audits.
Mining & Metallurgy Fasteners | 10.9 Anti-Vibration Bolts and Heavy-Duty Hot-Dip Protection
Fastening for screens, crushers, conveyors and dressing structures: 10.9 high-strength bolts with serrated-flange or all-metal locking at vibrating stations under proper preload control; hot-dip (1000 h+ NSS) or Dacromet parts for outdoor and tailings exposure; heavy shed and trestle steelwork bolts matched from the same supply.
Oil & Gas Fasteners | Wellhead and Manifold B7/B7M Studs, Sour Service and Desert Coatings
Bolting for wellheads, Christmas trees, separators and high-pressure manifolds: complete ASTM A193 B7 + A194 2H inch stud sets; sour service takes B7M/2HM with hardness held at max 235 HB under 100% inspection to block sulfide stress cracking; desert heat and salt call Dacromet or hot-dip carbon parts - heat-number certificates and test reports with every batch.
General Machinery & Steelwork Assembly Fasteners | Stocked Standards, Custom to Drawing
Bolting for machine frames, drive parts, curtain wall and solar trackers, racking, factory steelwork and vehicle assembly lines: stocked DIN933/931/912/934 sizes plus customs from M4-M100 (inch included); 8.8/10.9 hot-dip or Dacromet for steelwork and outdoor builds, lock nuts and torque control at vibrating machine and vehicle stations, and full-container kitting or private-label packing for distributors.
Standard, size and length, load, media and service environment.
We size the class, coating and torque against load and corrosion.
Selection advice, drawing and quotation confirmed before ordering.
Fastener Selection by Industry
Typical strength class, coating, size range and tightening torque by industry — enough to write a clear RFQ before you contact us.
| Industry / Joint | Recommended Class & Material | Recommended Finish | Typical Size Range | Media / Service Environment | Reference Torque (N·m) |
|---|---|---|---|---|---|
| Steel Structure & Bridges | Class 10.9 / 12.9 HS bolts (-40°C to +150°C) | Hot-dip galvanised ≥55µm / Geomet | M12–M36 | Atmosphere, rain, de-icing salt, traffic vibration | M16≈208 · M20≈403 · M24≈698 |
| Wind Towers & Base Rings | Class 10.9 (-40°C to +60°C, de-embedding mandatory) | Hot-dip galvanised + baking / Geomet | M24–M36 studs | Alternating wind load, marine atmosphere, low-temperature impact | M30≈1,650 (ultrasonic preload acceptance) |
| Petrochemical High-Temp Flanges | ASTM A193 B7 (≤425°C) / B16 (≤550°C) | Phosphated finish / MoS₂ anti-seize | M10–M100 studs | Steam, hydrocarbons, hot sour service | Hydraulic tension to target stress; torque for make-up only |
| Pumps, Valves & Pipe Flanges | Class 8.8 / 10.9, A2-70 (-20°C to +200°C) | Zinc plated (48–96 h salt spray) / Geomet | M10–M30 | Water, oils, mildly acidic or alkaline process fluids | M12≈86/123 · M16≈208/297 |
| Automotive & Axle Assembly | Class 10.9 / 12.9 (-40°C to +150°C) | Zinc-flake / Geomet (hydrogen-controlled) | M6–M20, mostly fine pitch | Transverse vibration, impact, salt-water splash | M10≈70 · M12≈123 · M14≈196 |
| Marine & Offshore | A4-80 (316) / Class 10.9 (-20°C to +120°C) | Hot-dip galvanised ≥55µm / 316 passivated | M8–M30 | Seawater, chloride splash zone, cabin condensation | A4-80: M16≈165 · M20≈320 |
| Food & Pharmaceutical Machinery | A4-80 (316) / A2-70 (-20°C to +150°C) | Passivated, free of iron contamination, no plating | M5–M16, low-profile heads | CIP acid/alkali, steam, high-chloride wash water | A2-70: M8≈32 · M10≈55 · M12≈130 |
| Mining & Metallurgical Plant | Class 10.9 / 12.9 (-20°C to +200°C) | Geomet / mechanical galvanising | M12–M42 | Heavy vibration, dust, slurry erosion | M16≈297 · M20≈576 (with locking nuts) |
| Facades & Solar Mounting | A2-70 (304) / Class 8.8 (-30°C to +80°C) | A2 self-colour / hot-dip galvanised near coast | M6–M16 | UV, acid rain, coastal salt spray, wind load | M8≈24 · M10≈49 · M12≈86 |
| Switchgear & Busbars | Class 8.8 / A2-70 (-10°C to +120°C) | Tin or nickel plated (low contact resistance) | M8–M20 | Thermal cycling, short-circuit force, dust | Per busbar maker — typically below strength-based torque |
| General Machinery Assembly | Class 4.8 / 8.8 / 10.9 (-20°C to +150°C) | Black oxide / blue-white or iridescent zinc | M4–M24 | Lubricating oil, compressed air, general atmosphere | M6≈10 · M8≈24 · M10≈49 · M12≈86 |
Not sure which class and finish fits your duty?
Tell us the joint and service conditions and our engineers will recommend the best fastening solution.