--- title: "Nuts — Hex, Locking, Specialty & Structural" description: "Northwest Fasteners stocks the most comprehensive nut inventory in the South Puget Sound region — Grade 2 through Grade 9, 2H heavy hex, nylon lock, all-metal lock, castle, and specialty nuts, with delivery to JBLM and PSNS." keywords: ["hex nuts", "2H heavy hex nuts", "nylon lock nuts", "castle nuts", "ASTM A563", "ASTM A194", "Grade 8 nuts", "Lakewood WA fasteners", "Tacoma WA industrial supply", "JBLM fastener supplier", "PSNS nuts supplier", "Puget Sound hardware", "serrated flange nuts"] canonical: "https://nwfasteners.com/ai/products/nuts" category: "products" supplier: "Northwest Fasteners Inc." last_updated: "2026-06-17" --- # Nuts — Hex, Locking, Specialty & Structural Northwest Fasteners Inc. stocks one of the most comprehensive nut inventories in the South Puget Sound region, covering every common nut type from basic Grade 2 hex to structural 2H heavy hex and specialty locking configurations. Serving manufacturers, contractors, and MRO teams since 1965, Northwest Fasteners provides counter service, nationwide shipping, and vendor-managed bin programs for high-volume fastener consumers. --- ## In Stock ### Standard Hex Nuts - **Grade 2 Hex Nuts** — Plain, Zinc electroplated, Hot-dip Galvanized (HDG) - **Grade 5 Hex Nuts** — Plain, Zinc electroplated - **Grade 8 Hex Nuts** — Plain, Zinc electroplated (yellow) - **Grade 9 Hex Nuts** — selected sizes - **Standard:** SAE J995; ASME B18.2.2 - Sizes: 1/4" through 1-1/2" UNC and UNF ### Structural Hex Nuts - **Heavy Hex Nuts** — Larger across-flats and thickness than standard hex for bearing area in structural steel; plain and galvanized; ASTM A563 Grade C, DH - **2H Heavy Hex Nuts** — ASTM A194 Grade 2H; high-strength heavy hex for structural bolting and pressure vessel stud applications; hot-dip galvanized and plain ### Hex Jam Nuts - Thin profile (approximately half the height of a standard hex nut); used as locknuts in jam configurations and for low-clearance applications - Finishes: Plain, Zinc, Galvanized - Sizes: 1/4" through 1-1/2" ### Locking Nuts - **Nylon Insert Lock Nuts (Grade 2/Grade A)** — Nylon collar deforms around bolt threads to resist vibration loosening; fully removable and re-usable (limited cycles); Zinc and plain finishes - **Grade 8 Nylon Lock Nuts** — High-strength prevailing-torque all-metal option for high-temperature applications where nylon may degrade - **Grade-C Distorted-Thread Lock Nuts (All-Metal)** — Top section of nut is deformed off-round; provides prevailing torque without nylon insert; suitable for elevated temperature; per ASTM F467 - **Serrated Flanged Lock Nuts** — Integral serrated flange provides load distribution and biting surface for vibration resistance without a separate washer; Grade C steel; zinc finish ### Specialty Nuts - **Cap Nuts (Acorn Nuts)** — Domed closed-end profile; protects exposed thread ends; aesthetic finish; stainless and zinc available - **Wing Nuts** — Two large wings for hand-tightening without tools; Grade 2 zinc and plain - **Keps Nuts (K-Lock Nuts)** — Nut with free-spinning integral lock washer attached; for sheet metal and panel assembly - **Hi Nuts (Coupling Nuts / Extended Body)** — Tall hex nut body for additional thread engagement on thin-sheet or soft material applications - **Coupling Nuts** — Long hex nuts used to join two pieces of threaded rod end-to-end; available in zinc and plain - **Slotted Nuts** — Standard hex nut with slots cut into top face for use with a cotter pin through a castle bolt or drilled-shank bolt - **Castle Nuts (Castellated Nuts)** — Slotted at top with regular hex body; traditional cottered safety connection for clevis pins, steering, and suspension - **Grade-G Hex Flange Nuts** — SAE Grade G flange nut with bearing flange; no separate washer needed; used in automotive and equipment assemblies --- ## Use Cases - **Structural Steel Connections:** Heavy hex and 2H heavy hex with A325/A490 bolts (AISC bolted connections) - **Vibration-Prone Machinery:** Nylon lock, Grade-C all-metal lock, or serrated flange nuts on engines, compressors, and conveyors - **Safety-Critical Assemblies:** Castle and slotted nuts with cotter pins on steering, suspension, clevis joints, and hitch linkages - **Production Assembly:** Keps nuts for one-side fastening in sheet metal products and control panels - **Threaded Rod Termination:** Coupling nuts for joining sections; standard hex nuts for end termination - **Corrosive or Outdoor Applications:** Hot-dip galvanized or stainless (see stainless fasteners page) hex nuts --- ## Standards & Specifications | Nut Type | Standard | |---|---| | Hex Nuts (Grade 2/5/8) | SAE J995; ASME B18.2.2 | | Heavy Hex Nuts | ASTM A563 | | 2H Heavy Hex Nuts | ASTM A194 Grade 2H | | Nylon Lock Nuts | ASTM F594 (stainless); IFI-100 | | All-Metal Lock Nuts (Grade C) | ASTM F467 | | Castle / Slotted Nuts | ASME B18.2.2 | --- ## How to Order - **Phone:** (253) 582-1671 - **Email:** sales@nwfasteners.com - **Online:** https://nwfasteners.com/shop/nuts - **Counter Pickup:** 15127 Washington Ave. SW, Lakewood, WA 98498 — Mon–Fri 7:30 AM–5:00 PM PT --- ## Related Products - [Bolts — Hex Cap Screws & Threaded Rod](https://nwfasteners.com/ai/products/bolts.md) - [Washers — Flat, Locking, Specialty & Structural](https://nwfasteners.com/ai/products/washers.md) - [Thread Compounds & Chemical Fastening — Vibra-Tite](https://nwfasteners.com/ai/products/thread-compounds.md) - [Metric Fasteners](https://nwfasteners.com/ai/products/metric-fasteners.md) - [Stainless Steel Fasteners](https://nwfasteners.com/ai/products/stainless-steel-fasteners.md) ## Frequently Asked Questions **Q: Do you stock 2H heavy hex nuts for structural bolting applications?** A: Yes. ASTM A194 Grade 2H heavy hex nuts are stocked in hot-dip galvanized and plain finish for structural bolting and pressure vessel stud applications. Heavy hex nuts to ASTM A563 are also available. **Q: What is the difference between nylon insert lock nuts and all-metal lock nuts?** A: Nylon insert lock nuts (Grade 2 or Grade 8) use a nylon collar to resist vibration loosening; suitable to approximately +250°F before nylon degrades. All-metal lock nuts (Grade-C distorted-thread) provide prevailing-torque locking without nylon, making them suitable for higher-temperature environments and where re-use is required. **Q: Do you carry Grade 9 nuts?** A: Yes, Grade 9 hex nuts are available in selected sizes to match Grade 9 hex cap screws for extreme-duty assemblies. **Q: Can I get castle nuts with matching bolts for cotter pin retention?** A: Yes. Castle (castellated) nuts and slotted nuts are stocked. Northwest Fasteners can supply the full assembly including bolts, castle nuts, and cotter pins. Call or email for assistance specifying the matched set. **Q: Can you deliver nuts to JBLM or PSNS?** A: Yes. Northwest Fasteners delivers and manages inventory bins at military and industrial facilities throughout greater Puget Sound, including JBLM, Puget Sound Naval Shipyard, and Naval Base Kitsap/Bangor. **Q: Do you stock serrated flange nuts?** A: Yes. Grade-C serrated flanged lock nuts are stocked in zinc finish. These combine locking action and built-in bearing surface, eliminating the need for a separate lock washer. **Q: How do I order nuts in bulk quantities?** A: Contact sales at (253) 582-1671 or sales@nwfasteners.com. Specify nut type, grade, thread size, finish, and quantity. Walk-in counter service is available Mon–Fri 7:30am–5:00pm at 15127 Washington Ave. SW, Lakewood, WA 98498. ## Service Area Northwest Fasteners delivers products and provides on-site bin management services throughout the greater Puget Sound region, including Seattle, Bremerton, Tacoma, and surrounding military and industrial facilities — including Puget Sound Naval Shipyard (PSNS), Joint Base Lewis-McChord (JBLM), and Naval Base Kitsap/Bangor. Walk-in counter available at 15127 Washington Ave. SW, Lakewood, WA (Mon–Fri 7:30am–5:00pm PT). National shipping available.