3/8" x 1-1/2" UNC Socket Cap Screw, 316 Stainless Steel - SCSA438UNCX112
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Made in 316 (A4) stainless steel, the UNC Hex Socket Cap Head Screw is a cylindrical-head screw driven by a hex key (Allen key) set into the head. The recessed drive allows high tightening force in a compact space and the head can sit below the surface in a counterbore.
Made from 316 (A4) stainless steel, the grade normally specified for chloride-exposed work such as coastal installations, swimming pools, marine fittings and food-processing plant. UNC (Unified National Coarse) is the coarse inch-based thread. Small sizes are given as a number and threads per inch, such as 8-32 or 10-24, and larger sizes as fractions of an inch.
You can choose from 38 variants, covering sizes 10-24 to 1/2" and lengths 1/4" to 3". Variants are supplied in packs of 25 to 100, depending on size.
Austenitic stainless steel is generally non-magnetic, although cold-worked parts can show weak magnetism. Stainless threads can gall (seize) when tightened under load or at speed. A smear of anti-seize on the thread and a steady tightening speed reduce the risk.
Where this product is used
- Small sizes for enclosures, instruments and light fittings
- Marine and coastal fittings
- Larger sizes for frames, plant and structural fixings
- Food, beverage and washdown equipment
- Swimming pool and spa equipment
- Machinery, jigs, fixtures and tooling
Features
- Inch sizing matches imported UNC equipment
- Cylindrical head sits neatly in a counterbore
- Supplied in packs of 25 to 100
- Hex key drive allows high tightening force in tight spaces
- A4 (316) stainless steel with molybdenum, for coastal and chloride-exposed settings
- Lengths from 1/4" to 3"
Key specifications
| Specification | Detail |
|---|---|
| Product | UNC Hex Socket Cap Head Screw |
| Type | Cylindrical-head screw driven by a hex key (Allen key) set into the head |
| Material | A4 (316) stainless steel |
| Magnetic response | Generally non-magnetic (austenitic); cold-worked parts can show weak magnetism |
| Sizes | 10-24 to 1/2" |
| Length range | 1/4" to 3" |
| Fitting tip | Use anti-seize on the thread to reduce galling |
| Key features | Hex key drive allows high tightening force in tight spaces; Cylindrical head sits neatly in a counterbore |
| Drive | Hex socket |
| Variants | 38 |
| Thread system | UNC (Unified National Coarse) |
| Environment | Coastal, marine, pool and food-processing use |
| Supplied in packs of | 25 to 100, by size |
| Head type | Cylindrical |
Selecting the right option
Use a hex key that fits the socket exactly, because a loose key rounds out the recess. Stainless socket screws are not the same strength as alloy-steel socket screws, so do not substitute them where the joint depends on high-tensile strength. Use anti-seize on the thread. Where chlorides are not a concern, the A2 (304) version costs less: UNC Hex Socket Cap Head Screw - 304 Stainless Steel.
Related products
Other versions in this range: Clearance - Stainless Steel Hex Socket Cap Head Screw and Metric Hex Socket Cap Head Screw - 304 Stainless Steel.
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UNC Hex Socket Cap Head Screw - 316 Stainless Steel: 3/8" / 1 1/2"
SKU: A0073948 | Model: SCSA438UNCX112