4-40 x 5/8 Oval Point Alloy Steel Socket Set Screw with Nylon Insert identifies the exact thread and length for an alloy steel oval point set screw with a nylon insert. The rounded oval point can make tangent contact on flat, angled, curved, or grooved mating surfaces. Specify the heat-treated alloy steel body with nylon pellet when the print calls for mechanical set screw hardware, not a stainless substitute.
Grooved-shaft assemblies use the oval point to ride the groove while helping retain axial position. The polymer insert changes the service envelope versus an all-metal screw, so review heat exposure before specifying it.
The nylon pellet is added to create thread drag while leaving the rounded point responsible for mating-surface contact. For replacement work, Cold Headers keeps the thread, length, alloy material, rounded point, and insert requirement together. Check thread size, length, socket size, pellet dimensions, groove or seat condition, and surface-marking tolerance before substitution.
Technical Highlights
- Point: Oval (rounded radiused tip)
- Material: Alloy Steel
- Thread Size: 4-40
- Length: 5/8 in.
- Drive: Internal Hex
- Hex Key Size: 0.050 in.
- Locking Feature: Nylon insert providing prevailing torque
- Nylon Insert Diameter (P): 1/16 in.
- Nylon Insert Location (N): 3/32 in., +/-1/2 pitch
- Dimensional Standard: ASME B18.3
Call 773-775-7900 or email Sales@coldheaders.com for pricing, availability, or a quote.
