18-8 Stainless Steel Pan Head Screw

with Internal-Tooth Lock Washer, 4-40 Thread Size, 1/4" Long

Technical Drawing of 18-8 Stainless Steel Pan Head Screw, with Internal-Tooth Lock Washer, 4-40 Thread Size, 1/4" Long.

Image of Product. Back orientation. 18-8 Stainless Steel Pan Head Screw, with Internal-Tooth Lock Washer, 4-40 Thread Size, 1/4" Long.

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00000 per pack of 50

95345A023

In stock

95345A023

00000 per pack of 50

QuantityPack of 50

In stock

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Locking Type	Lock Washer
Thread
Size	4-40
Direction	Right Hand
Spacing	Coarse
Type	UNC
Fit	Unified Standard Class 2A
Tip Type	Flat
Fastener Head Type	Rounded
Head
Style	Pan
Profile	Standard
Height	0.08"
Diameter	0.219"
Drive
Style	Phillips
Size	No. 1
Tooth Location	Internal
Washer
Type	Tooth
Material	410 Stainless Steel
OD	0.268"
Thickness	0.018"
Length	1/4"
Threading	Fully Threaded
Tensile Strength	70,000 psi
Specifications Met	ASME B18.13
Hardness	Not Rated
Material	18-8 Stainless Steel
Passivation	Passivated
Performance	Corrosion Resistant, Vibration Resistant
Screw Size Decimal Equivalent	0.112"
System of Measurement	Inch
Country of Origin	United States
DFARS Compliance	Not Specialty Metals Compliant
Export Control Classification Number (ECCN)	EAR99
REACH Compliance	REACH (EC 1907/2006) (11/05/2025, 251 SVHC) Compliant
RoHS Compliance	RoHS 3 (2015/863/EU) Compliant
Schedule B Number	731815.9000
U.S.–Mexico–Canada Agreement (USMCA) Qualifying	Yes

These corrosion-resistant screws have a washer with sharp internal teeth to keep screws in place during vibration. Unlike external-tooth lock washers, their smooth outside edge provides a finished look and won’t snag on surrounding objects. Also known as Sems screws, the washer rotates freely but is permanently attached. These screws have a moderate height and width profile, offering a middle ground between narrower button heads and wider truss heads. The Phillips drive easily aligns with drivers and withstands more torque than slotted drives, but drivers slip when you apply too much force.

Length is measured from under the head.

18-8 Stainless Steel—The choice for wet and outdoor environments, these screws won't rust. However, they don't hold up to the harsh chemicals that 316 stainless steel can.