Spec Library · 1/4"-20 UNC Series
Hex cap screws, finished hex nuts, flat and split lock washers and contractor kits in 18-8/304 and 316 marine-grade stainless. Made under ISO 9001 and IATF 16949 quality systems, dimensioned to ASME, stocked in Southern California and traceable to the heat lot.
ASME B18.2.1
4 lengths · 1/2" to 1-1/2"
ASME B18.2.2
1/4"-20 UNC-2B
ASME B18.22.1
USS and SAE patterns
ASME B18.21.1
Regular section
240 pieces · 60 sets
High-durability storage case
Governing spec18-8 / 304 · UNS S30400 / S30430Screws ASTM F593 Group 1Nuts ASTM F594 Group 1Condition CW1100–150 ksi tensile65 ksi min yield
| Product | SKU | Key dimensions | Material / Pack | Actions | ||
|---|---|---|---|---|---|---|
 Hex Head Cap Screw 1/4"-20 × 1/2" | WF- In stock | 1/4"-20 UNC-2A |
| External hex · 7/16" | ||
 Hex Head Cap Screw 1/4"-20 × 3/4" | WF- In stock | 1/4"-20 UNC-2A |
| External hex · 7/16" | ||
Hex Head Cap Screw 1/4"-20 × 1" | WF- In stock | 1/4"-20 UNC-2A |
| External hex · 7/16" | ||
 Hex Head Cap Screw 1/4"-20 × 1-1/2" | WF- In stock | 1/4"-20 UNC-2A |
| External hex · 7/16" | ||
Finished Hex Nut 1/4"-20 | WF- In stock | 1/4"-20 UNC-2B |
| Hex · 7/16" | ||
Flat Washer · USS 1/4" | WF- In stock | Not applicable |
| Not applicable | ||
 Flat Washer · SAE 1/4" | WF- In stock | Not applicable |
| Not applicable | ||
Split Lock Washer 1/4" | WF- In stock | Not applicable |
| Not applicable | ||
Contractor Assortment Kit 1/4"-20 · 240 pc | WF- In stock | 1/4"-20 UNC |
| Mixed | ||
1/4"-20 × 1/2"
SKUWF-
1/4"-20 × 3/4"
SKUWF-
1/4"-20 × 1"
SKUWF-
1/4"-20 × 1-1/2"
SKUWF-
1/4"-20
SKUWF-
1/4"
SKUWF-
1/4"
SKUWF-
1/4"
SKUWF-
1/4"-20 · 240 pc
SKUWF-
Dimensions are nominal per the governing ASME standard. Full tolerance tables and MTRs on request.
Need a diameter, length or finish outside the initial release? Describe it in your RFQ and we will quote it from the mill.
Warehouse Stock · Southern California
Current availability for the 1/4"-20 release at our SoCal Distribution Center. Same-day dispatch on in-stock orders placed by 12:00 PM PT.
Updated
| Item | 18-8 / 304 | 316 Marine |
|---|---|---|
| Hex Head Cap Screw1/4"-20 × 1/2" | In stockWF-HCS1420-050-304 | In stockWF-HCS1420-050-316 |
| Hex Head Cap Screw1/4"-20 × 3/4" | In stockWF-HCS1420-075-304 | In stockWF-HCS1420-075-316 |
| Hex Head Cap Screw1/4"-20 × 1" | In stockWF-HCS1420-100-304 | In stockWF-HCS1420-100-316 |
| Hex Head Cap Screw1/4"-20 × 1-1/2" | In stockWF-HCS1420-150-304 | In stockWF-HCS1420-150-316 |
| Finished Hex Nut1/4"-20 | In stockWF-HN1420-304 | In stockWF-HN1420-316 |
| Flat Washer · USS1/4" | In stockWF-FWU14-304 | In stockWF-FWU14-316 |
| Flat Washer · SAE1/4" | In stockWF-FWS14-304 | In stockWF-FWS14-316 |
| Split Lock Washer1/4" | In stockWF-SLW14-304 | In stockWF-SLW14-316 |
| Contractor Assortment Kit1/4"-20 · 240 pc | In stockWF-KIT1420-240-304 | In stockWF-KIT1420-240-316 |
Hardware ships in bags of 100 pcs. Availability is confirmed on every quote; note pallet or volume quantities in your RFQ.
Parcel for bagged hardware and kits. Palletized LTL freight for distributor and volume orders.
Collect at the SoCal Distribution Center. Address provided with order confirmation.
Packing lists carry lot numbers for receiving and trace-back. MTRs on request.
Hours
Mon–Fri · 7:00 AM – 4:30 PM PT
Warehouse
SoCal Distribution Center
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