UNC/UNF 304 Stainless Steel Hollow Screw American Imperial Hex Cup Head Vacuum Exhaust Thread Fastener

Regular price $1.68 USD

Regular price ~~$1.68 USD~~ Sale price $1.68 USD

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Color classification 2 #-56 * 1/8 (10pcs) 304Variant sold out or unavailable 2 #-56 * 5/32 (10pcs) 304Variant sold out or unavailable 2 #-56 * 3/16 (10pcs) 304Variant sold out or unavailable 2 #-56 * 1/4 (10pcs) 304Variant sold out or unavailable 2 #-56 * 5/16 (10pcs) 304Variant sold out or unavailable 2 #-56 * 3/8 (10pcs) 304Variant sold out or unavailable 2 #-56 * 1/2 (10pcs) 304Variant sold out or unavailable 2 #-56 * 5/8 (10pcs) 304Variant sold out or unavailable 2 #-56 * 3/4 (5 pieces) 304Variant sold out or unavailable 2 #-56 * 7/8 (5pcs) 304Variant sold out or unavailable 2 #-56 * 1 (5 pieces) 304Variant sold out or unavailable 4 #-40 * 1/8 (10pcs) 304Variant sold out or unavailable 4 #-40 * 5/32 (10pcs) 304Variant sold out or unavailable 4 #-40 * 3/16 (10pcs) 304Variant sold out or unavailable 4 #-40 * 1/4 (10pcs) 304Variant sold out or unavailable 4 #-40 * 5/16 (10pcs) 304Variant sold out or unavailable 4 #-40 * 3/8 (10pcs) 304Variant sold out or unavailable 4 #-40 * 7/16 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304Variant sold out or unavailable 10#-32*1 (10 pieces) 304Variant sold out or unavailable 10#-32*1-1/8 (5 pieces) 304Variant sold out or unavailable 10#-32*1-1/4 (5 pieces) 304Variant sold out or unavailable 10#-32*1-3/8 (5 pieces) 304Variant sold out or unavailable 10#-32*1-1/2 (5 pieces) 304Variant sold out or unavailable 10#-32*1-3/4 (5 pieces) 304Variant sold out or unavailable 10#-32*2 (5 pieces) 304Variant sold out or unavailable 12#-24*3/8 (5 pieces) 304Variant sold out or unavailable 12#-24*1/2 (5 pieces) 304Variant sold out or unavailable 12 #-24 * 5/8 (5 pieces) 304Variant sold out or unavailable 12 #-24 * 3/4 (5 pieces) 304Variant sold out or unavailable 12 #-24 * 1 (5 pieces) 304Variant sold out or unavailable 12 #-24 * 1-1/4 (5pcs) 304Variant sold out or unavailable 12 #-24 * 1-1/2 (5pcs) 304Variant sold out or unavailable 12 #-24 * 1-3/4 (5pcs) 304Variant sold out or unavailable 12 #-24 * 2 (5 pieces) 304Variant sold out or unavailable 1/4-20 * 5/16 (10pcs) 304 without 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(5pcs) 304Variant sold out or unavailable 3/8-24 * 1-1/4 (5 pieces) 304Variant sold out or unavailable 3/8-24 * 1-1/2 (5 pieces) 304Variant sold out or unavailable 3/8-24 * 1-3/4 (2pcs) 304Variant sold out or unavailable 3/8-24 * 2 (2pcs) 304Variant sold out or unavailable 4 #-40 * 3/16 (20pcs) 316Variant sold out or unavailable 6 #-32 * 7/16 (20pcs) 316Variant sold out or unavailable 8 #-32 * 3/8 (20pcs) 316Variant sold out or unavailable 8 #-32 * 7/16 (20pcs) 316Variant sold out or unavailable 8 #-32 * 5/8 (20pcs) 316Variant sold out or unavailable

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304 stainless steel UNC/UNF hollow screws are specialized American imperial fasteners engineered for vacuum, exhaust, and precision industrial applications. Designed with a hex socket cup head and hollow structure, these screws comply with both UNC (Unified National Coarse) and UNF (Unified National Fine) standards, offering versatile compatibility with US imperial systems for diverse industrial needs.

Crafted from premium 304 stainless steel, the screws deliver exceptional corrosion resistance and durability, making them suitable for harsh vacuum environments, exhaust systems, and applications exposed to temperature fluctuations or mild chemicals. The hex socket cup head ensures secure tool engagement and precise torque control, while the hollow core design is optimized for vacuum sealing, exhaust airflow, and lightweight precision installations—eliminating excess material without compromising structural integrity.

Engineered with precision exhaust threads, they provide tight, leak-resistant connections critical for vacuum systems and exhaust assemblies. As American imperial fasteners, they seamlessly fit US-standard tools and workpieces, catering to manufacturers, maintenance professionals, and engineers in automotive, aerospace, and industrial equipment sectors. The dual UNC/UNF compatibility covers both coarse and fine thread requirements, reducing the need for multiple fastener types.

Core Features & Advantages

304 Stainless Steel: Corrosion-resistant, durable for vacuum/exhaust and harsh industrial environments.
UNC/UNF Dual Standard: Fits US imperial coarse/fine threads, versatile for diverse applications.
Hex Socket Cup Head: Secure tool engagement, precise torque control, low-profile finish.
Hollow Core Design: Optimized for vacuum sealing, exhaust airflow, and lightweight precision.
American Imperial Specification: Compatible with US-standard tools and workpieces.

Key Specifications

Material: 304 Stainless Steel
Thread Standards: UNC (Unified National Coarse), UNF (Unified National Fine)
Thread Type: American Imperial, Exhaust Thread
Drive & Head: Hex Socket, Cup Head
Design: Hollow Core, Vacuum-Compatible
Applications: Vacuum Systems, Exhaust Assemblies, Industrial Equipment, US-Spec Precision Installations
Performance: Corrosion-Resistant, Leak-Resistant, Lightweight, High-Precision