SkyLoc® EXT Studs — Flight-Critical Structural Fastening
Series: QL4S-EXT (Flat Head configuration)
EXT studs feature a 1/4-28 two-lead thread in 4140 cadmium-plated steel, for use in primary and secondary aircraft structures. Available in multiple grip ranges to support varying panel stack-ups.
⚙ Specifications
Grip Range Coverage: 0.18" – 0.85"+ (varies by dash number)
Shank Diameter: 0.2495" – 0.2470"
📋 Typical Dash Numbers
QL4S-EXT2 Grip: 0.18" – 0.29"
QL4S-EXT4 Grip: 0.291" – 0.43"
QL4S-EXT6 Grip: 0.431" – 0.57"
QL4S-EXT8 Grip: 0.571" – 0.71"
QL4S-EXT10 Grip: 0.711" – 0.85"
✓ Applications
- Primary structural panels
- Flight-critical access doors
- Engine nacelle installations
- High-load avionics enclosures
QL4S-EXT2
2-Lead Structural Stud - L=0.777 Grip 0.180-0.290
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$17.23 - $21.81
Price Details
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QL4S-EXT4
2-Lead Structural Stud - L=0.917 Grip 0.291-0.430
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$17.23 - $21.81
Price Details
Alternate Part Number 1:
CA21037-4-4HS
Alternate Part Number 2:
5306-01-056-6522
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QL4S-EXT6
2-Lead Structural Stud - L=1.057 Grip 0.431-0.570
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$27.02 - $34.20
Price Details
Alternate Part Number 1:
CA21037-4-6HS
Alternate Part Number 2:
5306-01-051-9622
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QL4S-EXT8
2-Lead Structural Stud - L=1.197 Grip 0.571-0.710
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$29.32 - $37.11
Price Details
Alternate Part Number 1:
CA21037-4-8HS
Alternate Part Number 2:
5306-01-051-3467
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QL4S-EXT10
2-Lead Structural Stud - L=1.337 Grip 0.711-0.850
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$31.01 - $39.25
Price Details
Alternate Part Number 1:
CA21037-4-10HS
Alternate Part Number 2:
5306-01-413-5987
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